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1 Read files

Main data source for this project is the preprocessed version of the GLODAPv2.2020_Merged_Master_File.csv downloaded from glodap.info in June 2020.

CAVEAT: This file still contains neutral densities gamma calculated with a preliminary method. However, this is consistent with the way gamma is currently calculated in this script and should therefore be maintained until changed on all levels.

GLODAP <-
  read_csv(paste(path_preprocessing,
                 "GLODAPv2.2020_preprocessed.csv",
                 sep = ""))


GLODAP_CB <-
  read_csv(paste(path_preprocessing,
                 "GLODAPv2.2020_Canyon-B.csv",
                 sep = ""))

2 Data preparation

2.1 Reference eras

Samples were assigned to following eras:

# create labels for era
labels <- bind_cols(
  start = params_local$era_breaks+1,
  end = lead(params_local$era_breaks))

labels <- labels %>% 
  filter(!is.na(end)) %>% 
  mutate(end = if_else(end == Inf, max(GLODAP$year), end),
         label = paste(start, end, sep = "-")) %>% 
  select(label) %>% 
  pull()

# cut observation years into era applying the labels
GLODAP <- GLODAP %>%
  filter(year > params_local$era_breaks[1]) %>% 
  mutate(era = cut(year,
                   params_local$era_breaks,
                   labels = labels))

levels(GLODAP$era)
[1] "1982-1999" "2000-2012" "2013-2019"
rm(labels)

2.2 Spatial boundaries

2.2.1 Basin mask

The basin mask from the World Ocean Atlas was used. For details consult the data base subsection for WOA18 data.

Please note that some GLODAP observations were made outside the WOA18 basin mask (i.e. in marginal seas) and will be removed for further analysis.

# use only data inside basinmask
GLODAP <- inner_join(GLODAP, basinmask)

2.2.2 Depth

Observations collected shallower than:

  • minimum sampling depth: 150m

were excluded from the analysis to avoid seasonal bias.

GLODAP <- GLODAP %>% 
  filter(depth >= params_local$depth_min)

2.2.3 Bottomdepth

Observations collected in an area with a:

  • minimum bottom depth: 0m

were excluded from the analysis to avoid coastal impacts. Please note that minimum bottom depth criterion of 0m means that no filtering was applied here.

GLODAP <- GLODAP %>% 
  filter(bottomdepth >= params_local$bottomdepth_min)

2.3 Flags and missing data

Only rows (samples) for which all relevant parameters are available were selected, ie NA’s were removed.

According to Olsen et al (2020), flags within the merged master file identify:

  • f:

    • 2: Acceptable
    • 0: Interpolated (nutrients/oxygen) or calculated (CO[2] variables)
    • 9: Data not used (so, only NA data should have this flag)
  • qc:

    • 1: Adjusted or unadjusted data
    • 0: Data appear of good quality but have not been subjected to full secondary QC
    • data with poor or uncertain quality are excluded.

Following flagging criteria were taken into account:

  • flag_f: 2, 0
  • flag_qc: 1, 0

The cleaning process was performed successively and the maps below represent the data coverage at various cleaning levels.

Summary statistics were calculated during cleaning process.

2.3.1 tco2

2.3.1.1 NA

Rows with missing tco2 observations were already removed in the preprocessing. The map below shows the coverage of preprocessed GLODAP data.

GLODAP_stats <- GLODAP %>% 
  summarise(tco2_values = n())

GLODAP_obs_grid <- GLODAP %>% 
  count(lat, lon, era) %>% 
  mutate(cleaning_level = "tco2_values")
GLODAP_obs <- GLODAP %>% 
  group_by(lat, lon) %>% 
  summarise(n = n()) %>% 
  ungroup()

map +
  geom_raster(data = basinmask, aes(lon, lat, fill = basin)) +
  geom_raster(data = GLODAP_obs, aes(lon, lat)) +
  scale_fill_brewer(palette = "Dark2") +
  theme(legend.position = "top",
        legend.title = element_blank())

Version Author Date
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rm(GLODAP_obs)

2.3.1.2 f flag

GLODAP_obs_grid_temp <- GLODAP %>%
  count(lat, lon, era, tco2f)

map +
  geom_raster(data = GLODAP_obs_grid_temp, aes(lon, lat, fill = n)) +
  scale_fill_viridis_c(option = "magma",
                       direction = -1,
                       trans = "log10") +
  facet_grid(era ~ tco2f) +
  theme(legend.position = "top")

Version Author Date
33ba23c jens-daniel-mueller 2021-01-07
318609d jens-daniel-mueller 2020-12-23
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rm(GLODAP_obs_grid_temp)

GLODAP <- GLODAP %>%
  filter(tco2f %in% params_local$flag_f)

2.3.1.3 qc flag

GLODAP_obs_grid_temp <- GLODAP %>%
  count(lat, lon, era, tco2qc)

map +
  geom_raster(data = GLODAP_obs_grid_temp, aes(lon, lat, fill = n)) +
  scale_fill_viridis_c(option = "magma",
                       direction = -1,
                       trans = "log10") +
  facet_grid(era ~ tco2qc) +
  theme(legend.position = "top")

Version Author Date
7b672f7 jens-daniel-mueller 2021-01-11
33ba23c jens-daniel-mueller 2021-01-07
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##

GLODAP <- GLODAP %>%
  filter(tco2qc %in% params_local$flag_qc)

GLODAP_stats_temp <- GLODAP %>%
  summarise(tco2_flag = n())

GLODAP_stats <- cbind(GLODAP_stats, GLODAP_stats_temp)
rm(GLODAP_stats_temp)

##

GLODAP_obs_grid_temp <- GLODAP %>%
  count(lat, lon, era) %>%
  mutate(cleaning_level = "tco2_flag")

GLODAP_obs_grid <-
  bind_rows(GLODAP_obs_grid, GLODAP_obs_grid_temp)

rm(GLODAP_obs_grid_temp)

2.3.2 talk

2.3.2.1 NA

GLODAP <- GLODAP %>% 
  mutate(talkna = if_else(is.na(talk), "NA", "Value"))

GLODAP_obs_grid_temp <- GLODAP %>%
  count(lat, lon, era, talkna)

map +
  geom_raster(data = GLODAP_obs_grid_temp, aes(lon, lat, fill = n)) +
  scale_fill_viridis_c(option = "magma",
                       direction = -1,
                       trans = "log10") +
  facet_grid(era ~ talkna) +
  theme(legend.position = "top")

Version Author Date
7b672f7 jens-daniel-mueller 2021-01-11
33ba23c jens-daniel-mueller 2021-01-07
318609d jens-daniel-mueller 2020-12-23
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GLODAP <- GLODAP %>% 
  select(-talkna) %>% 
  filter(!is.na(talk))

##

GLODAP_stats_temp <- GLODAP %>% 
  summarise(talk_values = n())

GLODAP_stats <- cbind(GLODAP_stats, GLODAP_stats_temp)
rm(GLODAP_stats_temp)

##

GLODAP_obs_grid_temp <- GLODAP %>% 
  count(lat, lon, era) %>% 
  mutate(cleaning_level = "talk_values")

GLODAP_obs_grid <-
  bind_rows(GLODAP_obs_grid, GLODAP_obs_grid_temp)

rm(GLODAP_obs_grid_temp)

2.3.2.2 f flag

GLODAP_obs_grid_temp <- GLODAP %>%
  count(lat, lon, era, talkf)

map +
  geom_raster(data = GLODAP_obs_grid_temp, aes(lon, lat, fill = n)) +
  scale_fill_viridis_c(option = "magma",
                       direction = -1,
                       trans = "log10") +
  facet_grid(era ~ talkf) +
  theme(legend.position = "top",
        legend.title = element_blank())

Version Author Date
7b672f7 jens-daniel-mueller 2021-01-11
33ba23c jens-daniel-mueller 2021-01-07
318609d jens-daniel-mueller 2020-12-23
6949b06 jens-daniel-mueller 2020-12-23
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# ###

GLODAP <- GLODAP %>%
  filter(talkf %in% params_local$flag_f)

2.3.2.3 qc flag

GLODAP_obs_grid_temp <- GLODAP %>%
  count(lat, lon, era, talkqc)

map +
  geom_raster(data = GLODAP_obs_grid_temp, aes(lon, lat, fill = n)) +
  scale_fill_viridis_c(option = "magma",
                       direction = -1,
                       trans = "log10") +
  facet_grid(era ~ talkqc) +
  theme(legend.position = "top",
        legend.title = element_blank())

Version Author Date
7b672f7 jens-daniel-mueller 2021-01-11
33ba23c jens-daniel-mueller 2021-01-07
318609d jens-daniel-mueller 2020-12-23
6949b06 jens-daniel-mueller 2020-12-23
0aa2b50 jens-daniel-mueller 2020-12-23
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b02b7a4 jens-daniel-mueller 2020-12-01
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###

GLODAP <- GLODAP %>%
  filter(talkqc %in% params_local$flag_qc)

##

GLODAP_stats_temp <- GLODAP %>%
  summarise(talk_flag = n())

GLODAP_stats <- cbind(GLODAP_stats, GLODAP_stats_temp)
rm(GLODAP_stats_temp)

##

GLODAP_obs_grid_temp <- GLODAP %>%
  count(lat, lon, era) %>%
  mutate(cleaning_level = "talk_flag")

GLODAP_obs_grid <-
  bind_rows(GLODAP_obs_grid, GLODAP_obs_grid_temp)

rm(GLODAP_obs_grid_temp)

2.3.3 Phosphate

2.3.3.1 NA

GLODAP <- GLODAP %>% 
  mutate(phosphatena = if_else(is.na(phosphate), "NA", "Value"))

GLODAP_obs_grid_temp <- GLODAP %>%
  count(lat, lon, era, phosphatena)

map +
  geom_raster(data = GLODAP_obs_grid_temp, aes(lon, lat, fill = n)) +
  scale_fill_viridis_c(option = "magma",
                       direction = -1,
                       trans = "log10") +
  facet_grid(era ~ phosphatena) +
  theme(legend.position = "top")

Version Author Date
7b672f7 jens-daniel-mueller 2021-01-11
33ba23c jens-daniel-mueller 2021-01-07
318609d jens-daniel-mueller 2020-12-23
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GLODAP <- GLODAP %>% 
  select(-phosphatena) %>% 
  filter(!is.na(phosphate))

##

GLODAP_stats_temp <- GLODAP %>% 
  summarise(phosphate_values = n())

GLODAP_stats <- cbind(GLODAP_stats, GLODAP_stats_temp)
rm(GLODAP_stats_temp)

##

GLODAP_obs_grid_temp <- GLODAP %>% 
  count(lat, lon, era) %>% 
  mutate(cleaning_level = "phosphate_values")

GLODAP_obs_grid <-
  bind_rows(GLODAP_obs_grid, GLODAP_obs_grid_temp)

rm(GLODAP_obs_grid_temp)

2.3.3.2 f flag

GLODAP_obs_grid_temp <- GLODAP %>%
  count(lat, lon, era, phosphatef)

map +
  geom_raster(data = GLODAP_obs_grid_temp, aes(lon, lat, fill = n)) +
    scale_fill_viridis_c(option = "magma",
                       direction = -1,
                       trans = "log10") +
  facet_grid(era~phosphatef) +
  theme(legend.position = "top",
        legend.title = element_blank())

Version Author Date
7b672f7 jens-daniel-mueller 2021-01-11
33ba23c jens-daniel-mueller 2021-01-07
318609d jens-daniel-mueller 2020-12-23
6949b06 jens-daniel-mueller 2020-12-23
0aa2b50 jens-daniel-mueller 2020-12-23
2886da0 jens-daniel-mueller 2020-12-19
02f0ee9 jens-daniel-mueller 2020-12-18
3ebff89 jens-daniel-mueller 2020-12-12
2fd0a2a jens-daniel-mueller 2020-12-11
24a632f jens-daniel-mueller 2020-12-07
6a8004b jens-daniel-mueller 2020-12-07
70bf1a5 jens-daniel-mueller 2020-12-07
7555355 jens-daniel-mueller 2020-12-07
143d6fa jens-daniel-mueller 2020-12-07
37e9dac jens-daniel-mueller 2020-12-02
7c25f7a jens-daniel-mueller 2020-12-02
b02b7a4 jens-daniel-mueller 2020-12-01
196be51 jens-daniel-mueller 2020-11-30
###

GLODAP <- GLODAP %>%
  filter(phosphatef %in% params_local$flag_f)

2.3.3.3 qc flag

GLODAP_obs_grid_temp <- GLODAP %>%
  count(lat, lon, era, phosphateqc)

map +
  geom_raster(data = GLODAP_obs_grid_temp, aes(lon, lat, fill = n)) +
    scale_fill_viridis_c(option = "magma",
                       direction = -1,
                       trans = "log10") +
  facet_grid(era~phosphateqc) +
  theme(legend.position = "top",
        legend.title = element_blank())

Version Author Date
7b672f7 jens-daniel-mueller 2021-01-11
33ba23c jens-daniel-mueller 2021-01-07
318609d jens-daniel-mueller 2020-12-23
6949b06 jens-daniel-mueller 2020-12-23
0aa2b50 jens-daniel-mueller 2020-12-23
2886da0 jens-daniel-mueller 2020-12-19
02f0ee9 jens-daniel-mueller 2020-12-18
3ebff89 jens-daniel-mueller 2020-12-12
2fd0a2a jens-daniel-mueller 2020-12-11
24a632f jens-daniel-mueller 2020-12-07
6a8004b jens-daniel-mueller 2020-12-07
70bf1a5 jens-daniel-mueller 2020-12-07
7555355 jens-daniel-mueller 2020-12-07
143d6fa jens-daniel-mueller 2020-12-07
37e9dac jens-daniel-mueller 2020-12-02
7c25f7a jens-daniel-mueller 2020-12-02
b02b7a4 jens-daniel-mueller 2020-12-01
196be51 jens-daniel-mueller 2020-11-30
###

GLODAP <- GLODAP %>%
  filter(phosphateqc %in% params_local$flag_qc)

##

GLODAP_stats_temp <- GLODAP %>%
  summarise(phosphate_flag = n())

GLODAP_stats <- cbind(GLODAP_stats, GLODAP_stats_temp)
rm(GLODAP_stats_temp)

##

GLODAP_obs_grid_temp <- GLODAP %>%
  count(lat, lon, era) %>%
  mutate(cleaning_level = "phosphate_flag")

GLODAP_obs_grid <-
  bind_rows(GLODAP_obs_grid, GLODAP_obs_grid_temp)

rm(GLODAP_obs_grid_temp)

2.3.4 eMLR variables

Variables required as predictors for the MLR fits, are subsetted for NAs and flags.

if ("temp" %in% params_local$MLR_predictors) {
  GLODAP <- GLODAP %>%
    filter(!is.na(temp))
}

##

if ("sal" %in% params_local$MLR_predictors) {
  GLODAP <- GLODAP %>%
    filter(!is.na(sal))
  
  GLODAP <- GLODAP %>%
    filter(salinityf %in% params_local$flag_f)
  
  GLODAP <- GLODAP %>%
    filter(salinityqc %in% params_local$flag_qc)
}

##

if ("silicate" %in% params_local$MLR_predictors) {
  GLODAP <- GLODAP %>%
    filter(!is.na(silicate))
  
  GLODAP <- GLODAP %>%
    filter(silicatef %in% params_local$flag_f)
  
  GLODAP <- GLODAP %>%
    filter(silicateqc %in% params_local$flag_qc)
}

##

if ("oxygen" %in% params_local$MLR_predictors |
    "phosphate_star" %in% params_local$MLR_predictors) {
  GLODAP <- GLODAP %>%
    filter(!is.na(oxygen))
  
  GLODAP <- GLODAP %>%
    filter(oxygenf %in% params_local$flag_f)
  
  GLODAP <- GLODAP %>%
    filter(oxygenqc %in% params_local$flag_qc)
}

##

if ("aou" %in% params_local$MLR_predictors) {
  GLODAP <- GLODAP %>%
    filter(!is.na(aou))
  
  GLODAP <- GLODAP %>%
    filter(aouf %in% params_local$flag_f)
}

##

if ("nitrate" %in% params_local$MLR_predictors) {
  GLODAP <- GLODAP %>%
    filter(!is.na(nitrate))
  
  GLODAP <- GLODAP %>%
    filter(nitratef %in% params_local$flag_f)
  
  GLODAP <- GLODAP %>%
    filter(nitrateqc %in% params_local$flag_qc)
}

##

GLODAP <- GLODAP %>%
  filter(!is.na(depth))

GLODAP <- GLODAP %>%
  filter(!is.na(gamma))

##

GLODAP_stats_temp <- GLODAP %>%
  summarise(eMLR_variables = n())

GLODAP_stats <- cbind(GLODAP_stats, GLODAP_stats_temp)

rm(GLODAP_stats_temp)

##

GLODAP_obs_grid_temp <- GLODAP %>%
  count(lat, lon, era) %>%
  mutate(cleaning_level = "eMLR_variables")

GLODAP_obs_grid <-
  bind_rows(GLODAP_obs_grid, GLODAP_obs_grid_temp)

rm(GLODAP_obs_grid_temp)
GLODAP <- GLODAP %>% 
  select(-ends_with(c("f", "qc")))

2.4 CANYON-B comparison

Cruises are removed, when the mean offset of the observation from the value predicted with CANYON-B is higher than 2 times the standard deviation of all cruise mean offsets. This critrion is evaluated individually for each variable involved in the eMLR approach.

# join data frames
GLODAP_combined <- left_join(GLODAP,
                             GLODAP_CB)

# calculate offset by parameter
GLODAP_combined <- GLODAP_combined %>%
  mutate(
    offset_talk = talk - talk_CANYONB,
    offset_tco2 = tco2 - tco2_CANYONB,
    offset_nitrate = nitrate - nitrate_CANYONB,
    offset_phosphate = phosphate - phosphate_CANYONB,
    offset_silicate = silicate - silicate_CANYONB
  ) %>%
  select(row_number,
         year,
         cruise,
         basin_AIP,
         lat,
         lon,
         starts_with("offset_"))

# pivot to long format
GLODAP_combined <- GLODAP_combined %>%
  pivot_longer(
    starts_with("offset"),
    names_to = "parameter",
    names_prefix = "offset_",
    values_to = "offset"
  )

2.4.1 Residual histograms

GLODAP_combined %>%
  ggplot(aes(offset)) +
  geom_histogram() +
  scale_y_continuous(trans = "log10") +
  facet_grid(basin_AIP ~ parameter, scales = "free_x")

Version Author Date
6482ed7 jens-daniel-mueller 2021-03-11

2.4.2 Ranked residuals

# calculate mean cruise offset by parameter
cruise_all <- GLODAP_combined %>%
  group_by(cruise, parameter) %>%
  summarise(
    mean_offset = mean(offset, na.rm = TRUE),
    sd_offset = sd(offset, na.rm = TRUE)
  ) %>%
  ungroup()

# rank offsets and calculate offset threshols
cruise_all <- cruise_all %>%
  group_by(parameter) %>%
  mutate(
    rank_offset = rank(mean_offset),
    threshold_offset = sd(mean_offset) * params_local$CANYON_B_max,
    cruise = as.factor(cruise)
  ) %>%
  ungroup() %>%
  arrange(parameter, rank_offset)

cruise_out <- cruise_all %>%
  filter(parameter %in% c("tco2", "talk", params_local$MLR_predictors)) %>% 
  filter(abs(mean_offset) > threshold_offset)

# length(unique(cruise_out$cruise))

for (i_parameter in unique(cruise_all$parameter)) {
  # i_parameter <- unique(cruise_all$parameter)[1]
  
  i_cruise_all <- cruise_all %>%
    filter(parameter == i_parameter)
  
  i_cruise_out <- cruise_out %>%
    filter(parameter == i_parameter)
  
  print(
  ggplot() +
    geom_hline(data = i_cruise_all,
               aes(yintercept = c(-1, 1) * threshold_offset),
               lty = 2) +
    geom_ribbon(
      data = i_cruise_all,
      aes(
        x = rank_offset,
        ymax = mean_offset + sd_offset,
        ymin = mean_offset-+sd_offset
      ),
      alpha = 0.3
    ) +
    geom_path(data = i_cruise_all,
              aes(rank_offset, mean_offset)) +
    geom_point(data = i_cruise_out,
               aes(rank_offset, mean_offset, col = cruise)) +
    labs(title = i_parameter)
  )
  
}

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6482ed7 jens-daniel-mueller 2021-03-11

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af75ebf jens-daniel-mueller 2021-03-14
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6482ed7 jens-daniel-mueller 2021-03-11

Version Author Date
af75ebf jens-daniel-mueller 2021-03-14
5017709 jens-daniel-mueller 2021-03-11
6482ed7 jens-daniel-mueller 2021-03-11
rm(i_parameter, i_cruise_all, i_cruise_out)

2.4.3 Remove cruises

GLODAP_out <- GLODAP %>%
  filter(cruise %in% cruise_out$cruise)

if (nrow(GLODAP_out) > 0) {
  map +
  geom_raster(data = GLODAP_out %>% distinct(lat, lon, era),
              aes(lon, lat)) +
  facet_wrap( ~ era, ncol = 1) +
  labs(title = "Maps of removed cruises")

} else {
  print("no cruises removed")
  
}

Version Author Date
af75ebf jens-daniel-mueller 2021-03-14
5017709 jens-daniel-mueller 2021-03-11
6482ed7 jens-daniel-mueller 2021-03-11

The ratio (%) of removed cruises is:

nrow(GLODAP_out) / nrow(GLODAP) * 100
[1] 3.484895
GLODAP <- GLODAP %>%
  filter(!(cruise %in% cruise_out$cruise))

2.5 Manual adjustment A16 cruise

For harmonization with Gruber et al. (2019), cruises 1041 (A16N) and 1042 (A16S) were grouped into the 2000-2012 era despite taking place in 2013/14:

  • y (y = applied, n = not applied)
GLODAP_cruises <- GLODAP %>% 
  filter(basin_AIP == "Atlantic",
         year %in% c(2013, 2014)) %>% 
  count(lat, lon, cruise)

map +
  geom_raster(data = GLODAP_cruises, aes(lon, lat, fill = as.factor(cruise))) +
  scale_fill_brewer(palette = "Dark2") +
  theme(legend.position = "top",
        legend.title = element_blank())

Version Author Date
7b672f7 jens-daniel-mueller 2021-01-11
33ba23c jens-daniel-mueller 2021-01-07
318609d jens-daniel-mueller 2020-12-23
6949b06 jens-daniel-mueller 2020-12-23
0aa2b50 jens-daniel-mueller 2020-12-23
2886da0 jens-daniel-mueller 2020-12-19
02f0ee9 jens-daniel-mueller 2020-12-18
158fe26 jens-daniel-mueller 2020-12-15
7d82772 jens-daniel-mueller 2020-12-11
c8acfcb jens-daniel-mueller 2020-12-11
70bf1a5 jens-daniel-mueller 2020-12-07
7555355 jens-daniel-mueller 2020-12-07
143d6fa jens-daniel-mueller 2020-12-07
196be51 jens-daniel-mueller 2020-11-30
rm(GLODAP_cruises)
if (params_local$A16_GO_SHIP == "y") {
  
GLODAP <- GLODAP %>%
  mutate(era = if_else(cruise %in% c(1041, 1042),
                       sort(unique(GLODAP$era))[2], era))
}

2.6 Create clean observations grid

Grid containing all grid cells where at least one observation remains available after cleaning.

GLODAP_obs_grid_clean <- GLODAP %>% 
  count(lat, lon) %>% 
  select(-n)

2.7 Write summary file

GLODAP_obs_grid_clean  %>%  write_csv(paste(path_version_data,
                                            "GLODAPv2.2020_clean_obs_grid.csv",
                                            sep = ""))

# select relevant columns for further analysis
GLODAP <- GLODAP %>% 
  select(year, date, era, basin, basin_AIP, lat, lon, cruise,
         bottomdepth, depth,
         temp, sal, gamma,
         tco2, talk, phosphate,
         oxygen, aou, nitrate, silicate)


GLODAP  %>%  write_csv(paste(path_version_data,
                             "GLODAPv2.2020_clean.csv",
                             sep = ""))

3 Overview plots

3.1 Number of overservations

GLODAP %>% 
  group_by(era, basin_AIP) %>% 
  count() %>% 
  gt(rowname_col = "basin_AIP",
     groupname_col = c("era")) %>% 
  summary_rows(
    groups = TRUE,
    fns = list(total = "sum")
  )
n
1982-1999
Atlantic 20878
Indian 19280
Pacific 22329
total 62,487.00
2000-2012
Atlantic 31676
Indian 15188
Pacific 58628
total 105,492.00
2013-2019
Atlantic 6917
Indian 4112
Pacific 35658
total 46,687.00

3.2 Cleaning stats

Number of observations at various steps of data cleaning.

GLODAP_stats_long <- GLODAP_stats %>%
  pivot_longer(1:length(GLODAP_stats),
               names_to = "parameter",
               values_to = "n")

GLODAP_stats_long <- GLODAP_stats_long %>%
  mutate(parameter = fct_reorder(parameter, n))

GLODAP_stats_long %>% 
  ggplot(aes(parameter, n/1000)) +
  geom_col() +
  coord_flip() +
  theme(axis.title.y = element_blank())

Version Author Date
7b672f7 jens-daniel-mueller 2021-01-11
33ba23c jens-daniel-mueller 2021-01-07
318609d jens-daniel-mueller 2020-12-23
6949b06 jens-daniel-mueller 2020-12-23
0aa2b50 jens-daniel-mueller 2020-12-23
2886da0 jens-daniel-mueller 2020-12-19
02f0ee9 jens-daniel-mueller 2020-12-18
5d452fe jens-daniel-mueller 2020-12-18
158fe26 jens-daniel-mueller 2020-12-15
3ebff89 jens-daniel-mueller 2020-12-12
2fd0a2a jens-daniel-mueller 2020-12-11
24a632f jens-daniel-mueller 2020-12-07
6a8004b jens-daniel-mueller 2020-12-07
70bf1a5 jens-daniel-mueller 2020-12-07
7555355 jens-daniel-mueller 2020-12-07
143d6fa jens-daniel-mueller 2020-12-07
b02b7a4 jens-daniel-mueller 2020-12-01
196be51 jens-daniel-mueller 2020-11-30
rm(GLODAP_stats_long)

3.3 Assign coarse spatial grid

For the following plots, the cleaned data set was re-opened and observations were gridded spatially to intervals of:

  • 5° x 5°
GLODAP <- m_grid_horizontal_coarse(GLODAP)

3.4 Histogram Zonal coverage

GLODAP_histogram_lat <- GLODAP %>%
  group_by(era, lat_grid, basin) %>%
  tally() %>%
  ungroup()

GLODAP_histogram_lat %>%
  ggplot(aes(lat_grid, n, fill = era)) +
  geom_col() +
  scale_fill_brewer(palette = "Dark2") +
  facet_wrap( ~ basin) +
  coord_flip() +
  theme(legend.position = "top",
        legend.title = element_blank())

Version Author Date
af75ebf jens-daniel-mueller 2021-03-14
5017709 jens-daniel-mueller 2021-03-11
85a5ed2 jens-daniel-mueller 2021-03-10
7b672f7 jens-daniel-mueller 2021-01-11
33ba23c jens-daniel-mueller 2021-01-07
318609d jens-daniel-mueller 2020-12-23
6949b06 jens-daniel-mueller 2020-12-23
0aa2b50 jens-daniel-mueller 2020-12-23
2886da0 jens-daniel-mueller 2020-12-19
02f0ee9 jens-daniel-mueller 2020-12-18
158fe26 jens-daniel-mueller 2020-12-15
984697e jens-daniel-mueller 2020-12-12
3ebff89 jens-daniel-mueller 2020-12-12
c8acfcb jens-daniel-mueller 2020-12-11
2fd0a2a jens-daniel-mueller 2020-12-11
24a632f jens-daniel-mueller 2020-12-07
6a8004b jens-daniel-mueller 2020-12-07
70bf1a5 jens-daniel-mueller 2020-12-07
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143d6fa jens-daniel-mueller 2020-12-07
7c25f7a jens-daniel-mueller 2020-12-02
0ff728b jens-daniel-mueller 2020-12-01
b02b7a4 jens-daniel-mueller 2020-12-01
196be51 jens-daniel-mueller 2020-11-30
rm(GLODAP_histogram_lat)

3.5 Median years (tref)

Median years of each era (tref) were determined as:

era_median_year <- GLODAP %>%
  group_by(era) %>%
  summarise(t_ref = median(year)) %>%
  ungroup()

era_median_year
# A tibble: 3 x 2
  era       t_ref
  <fct>     <dbl>
1 1982-1999  1995
2 2000-2012  2007
3 2013-2019  2016

3.6 Histogram temporal coverage

GLODAP_histogram_year <- GLODAP %>%
  group_by(year, basin) %>%
  tally() %>%
  ungroup()

GLODAP_histogram_year %>%
  ggplot() +
  geom_vline(xintercept = c(
    params_local$era_breaks + 0.5
  )) +
  geom_col(aes(year, n, fill = basin)) +
  geom_point(
    data = era_median_year,
    aes(t_ref, 0, shape = "Median year"),
    size = 2,
    fill = "white"
  ) +
  scale_fill_brewer(palette = "Dark2") +
  scale_shape_manual(values = 24, name = "") +
  scale_y_continuous() +
  coord_cartesian() +
  theme(
    legend.position = "top",
    legend.direction = "vertical",
    legend.title = element_blank(),
    axis.title.x = element_blank()
  )

Version Author Date
af75ebf jens-daniel-mueller 2021-03-14
5017709 jens-daniel-mueller 2021-03-11
85a5ed2 jens-daniel-mueller 2021-03-10
7b672f7 jens-daniel-mueller 2021-01-11
33ba23c jens-daniel-mueller 2021-01-07
318609d jens-daniel-mueller 2020-12-23
6949b06 jens-daniel-mueller 2020-12-23
0aa2b50 jens-daniel-mueller 2020-12-23
2886da0 jens-daniel-mueller 2020-12-19
02f0ee9 jens-daniel-mueller 2020-12-18
158fe26 jens-daniel-mueller 2020-12-15
984697e jens-daniel-mueller 2020-12-12
3ebff89 jens-daniel-mueller 2020-12-12
c8acfcb jens-daniel-mueller 2020-12-11
2fd0a2a jens-daniel-mueller 2020-12-11
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b02b7a4 jens-daniel-mueller 2020-12-01
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rm(GLODAP_histogram_year,
   era_median_year)

3.7 Zonal temporal coverage (Hovmoeller)

GLODAP_hovmoeller_year <- GLODAP %>%
  group_by(year, lat_grid, basin) %>%
  tally() %>%
  ungroup()

GLODAP_hovmoeller_year %>%
  ggplot(aes(year, lat_grid, fill = n)) +
  geom_tile() +
  geom_vline(xintercept = c(1999.5, 2012.5)) +
  scale_fill_viridis_c(option = "magma",
                       direction = -1,
                       trans = "log10") +
  facet_wrap( ~ basin, ncol = 1) +
  theme(legend.position = "top",
        axis.title.x = element_blank())

Version Author Date
af75ebf jens-daniel-mueller 2021-03-14
5017709 jens-daniel-mueller 2021-03-11
85a5ed2 jens-daniel-mueller 2021-03-10
7b672f7 jens-daniel-mueller 2021-01-11
33ba23c jens-daniel-mueller 2021-01-07
318609d jens-daniel-mueller 2020-12-23
6949b06 jens-daniel-mueller 2020-12-23
0aa2b50 jens-daniel-mueller 2020-12-23
2886da0 jens-daniel-mueller 2020-12-19
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rm(GLODAP_hovmoeller_year)

3.8 Coverage maps by era

3.8.1 Subsetting process

The following plots show the remaining data after individual cleaning steps, separately for each era.

GLODAP_obs_grid <- GLODAP_obs_grid %>%
  mutate(cleaning_level = factor(
           cleaning_level,
           unique(GLODAP_obs_grid$cleaning_level)
         ))

map +
  geom_raster(data = GLODAP_obs_grid %>%
                filter(cleaning_level == "tco2_values") %>%
                select(-cleaning_level),
              aes(lon, lat, fill = "tco2_values")) +
  geom_raster(data = GLODAP_obs_grid %>%
                filter(cleaning_level != "tco2_values"),
              aes(lon, lat, fill = "subset")) +
  scale_fill_brewer(palette = "Set1", name = "") +
  facet_grid(cleaning_level ~ era) +
  theme(legend.position = "top",
        axis.title = element_blank())

Version Author Date
7b672f7 jens-daniel-mueller 2021-01-11
33ba23c jens-daniel-mueller 2021-01-07
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37e9dac jens-daniel-mueller 2020-12-02
7c25f7a jens-daniel-mueller 2020-12-02
d5c5378 jens-daniel-mueller 2020-12-02
0ff728b jens-daniel-mueller 2020-12-01
b02b7a4 jens-daniel-mueller 2020-12-01
196be51 jens-daniel-mueller 2020-11-30

3.8.2 Final input data

The following plots show the remaining data density in each grid cell after all cleaning steps, separately for each era.

GLODAP_tco2_grid <- GLODAP %>%
  count(lat, lon)

map +
  # geom_raster(data = GLODAP_tco2_grid, aes(lon, lat), fill = "grey80") +
  geom_bin2d(data = GLODAP,
             aes(lon, lat),
             binwidth = c(1,1)) +
  scale_fill_viridis_c(option = "magma", direction = -1, trans = "log10") +
  facet_wrap(~era, ncol = 1) +
  labs(title = "Cleaned GLODAP observations",
       subtitle = paste("Version:", params_local$Version_ID)) +
  theme(axis.title = element_blank())

Version Author Date
af75ebf jens-daniel-mueller 2021-03-14
5017709 jens-daniel-mueller 2021-03-11
85a5ed2 jens-daniel-mueller 2021-03-10
7b672f7 jens-daniel-mueller 2021-01-11
33ba23c jens-daniel-mueller 2021-01-07
318609d jens-daniel-mueller 2020-12-23
6949b06 jens-daniel-mueller 2020-12-23
0aa2b50 jens-daniel-mueller 2020-12-23
2886da0 jens-daniel-mueller 2020-12-19
02f0ee9 jens-daniel-mueller 2020-12-18
158fe26 jens-daniel-mueller 2020-12-15
3ebff89 jens-daniel-mueller 2020-12-12
2fd0a2a jens-daniel-mueller 2020-12-11
24a632f jens-daniel-mueller 2020-12-07
6a8004b jens-daniel-mueller 2020-12-07
70bf1a5 jens-daniel-mueller 2020-12-07
7555355 jens-daniel-mueller 2020-12-07
143d6fa jens-daniel-mueller 2020-12-07
37e9dac jens-daniel-mueller 2020-12-02
7c25f7a jens-daniel-mueller 2020-12-02
d5c5378 jens-daniel-mueller 2020-12-02
083b3b0 jens-daniel-mueller 2020-12-02
0ff728b jens-daniel-mueller 2020-12-01
b02b7a4 jens-daniel-mueller 2020-12-01
196be51 jens-daniel-mueller 2020-11-30
ggsave(path = path_version_figures,
       filename = "data_distribution_era.png",
       height = 8,
       width = 5)

sessionInfo()
R version 4.0.3 (2020-10-10)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: openSUSE Leap 15.2

Matrix products: default
BLAS:   /usr/local/R-4.0.3/lib64/R/lib/libRblas.so
LAPACK: /usr/local/R-4.0.3/lib64/R/lib/libRlapack.so

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8    
 [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=en_US.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
 [1] gt_0.2.2        lubridate_1.7.9 metR_0.9.0      scico_1.2.0    
 [5] patchwork_1.1.1 collapse_1.5.0  forcats_0.5.0   stringr_1.4.0  
 [9] dplyr_1.0.2     purrr_0.3.4     readr_1.4.0     tidyr_1.1.2    
[13] tibble_3.0.4    ggplot2_3.3.2   tidyverse_1.3.0 workflowr_1.6.2

loaded via a namespace (and not attached):
 [1] httr_1.4.2               sass_0.2.0               jsonlite_1.7.1          
 [4] viridisLite_0.3.0        here_0.1                 modelr_0.1.8            
 [7] assertthat_0.2.1         blob_1.2.1               cellranger_1.1.0        
[10] yaml_2.2.1               pillar_1.4.7             backports_1.1.10        
[13] lattice_0.20-41          glue_1.4.2               RcppEigen_0.3.3.7.0     
[16] digest_0.6.27            RColorBrewer_1.1-2       promises_1.1.1          
[19] checkmate_2.0.0          rvest_0.3.6              colorspace_1.4-1        
[22] htmltools_0.5.0          httpuv_1.5.4             Matrix_1.2-18           
[25] pkgconfig_2.0.3          broom_0.7.2              haven_2.3.1             
[28] scales_1.1.1             whisker_0.4              later_1.1.0.1           
[31] git2r_0.27.1             generics_0.0.2           farver_2.0.3            
[34] ellipsis_0.3.1           withr_2.3.0              cli_2.1.0               
[37] magrittr_1.5             crayon_1.3.4             readxl_1.3.1            
[40] evaluate_0.14            fs_1.5.0                 fansi_0.4.1             
[43] xml2_1.3.2               RcppArmadillo_0.10.1.2.0 tools_4.0.3             
[46] data.table_1.13.2        hms_0.5.3                lifecycle_0.2.0         
[49] munsell_0.5.0            reprex_0.3.0             compiler_4.0.3          
[52] rlang_0.4.9              grid_4.0.3               rstudioapi_0.13         
[55] labeling_0.4.2           rmarkdown_2.5            gtable_0.3.0            
[58] DBI_1.1.0                R6_2.5.0                 knitr_1.30              
[61] utf8_1.1.4               rprojroot_2.0.2          stringi_1.5.3           
[64] parallel_4.0.3           Rcpp_1.0.5               vctrs_0.3.5             
[67] dbplyr_1.4.4             tidyselect_1.1.0         xfun_0.18