Last updated: 2020-03-16

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Knit directory: BloomSail/

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library(tidyverse)
library(patchwork)
library(seacarb)
library(metR)
library(scico)
# library(broom)
# library(lubridate)
# library(tibbletime)

1 Sensor data

Profile data are prepared by:

  • Ignoring those made on June 16 (pCO2 sensor not in operation)
  • Removing HydroC Flush and Zeroing periods
  • Selecting only continous downcast periods
  • Gridding profiles to 1m depth intervals
  • Discarding profiles with 3 or more observation missing within upper 20m (except shallow coastal station at Ostergarnsholm “P14”)

1.1 pCO2 profile overview

df <-
 read_csv(here::here("data/_merged_data_files",
                      "BloomSail_CTD_HydroC_track_RT.csv"),
               col_types = cols(ID = col_character(),
                                pCO2_analog = col_double(),
                                pCO2 = col_double(),
                                Zero = col_character(),
                                Flush = col_character(),
                                mixing = col_character(),
                                Zero_ID = col_integer(),
                                deployment = col_integer(),
                                lon = col_double(),
                                lat = col_double(),
                                pCO2_RT = col_double()))


# Filter relevant rows and columns

df <- df %>% 
  filter(type == "P",
         Flush == "0",
         Zero == "0",
         ID != "180616",
         !(station %in% c("PX1", "PX2"))) %>% 
  select(date_time, ID, type, station, lat, lon, dep, sal, tem, pCO2_raw = pCO2, pCO2 = pCO2_RT_mean, duration)


# Assign meta information

df <- df %>% 
  group_by(ID, station) %>% 
  mutate(duration = as.numeric(date_time - min(date_time))) %>%
  arrange(date_time) %>% 
  ungroup()

meta <- read_csv(here::here("Data/_summarized_data_files",
                          "Tina_V_Sensor_meta.csv"),
                 col_types = cols(ID = col_character()))

meta <- meta %>% 
    filter(ID != "180616",
           !(station %in% c("PX1", "PX2")))

df <- full_join(df, meta)
rm(meta)


# creating descriptive variables
df <- df %>% 
  mutate(phase = "standby",
         phase = if_else(duration >= start & duration < down & !is.na(down) & !is.na(start),   "down", phase),
         phase = if_else(duration >= down  & duration < lift & !is.na(lift) & !is.na(down ),   "low",  phase),
         phase = if_else(duration >= lift  & duration < up   & !is.na(up  ) & !is.na(lift  ),  "mid",  phase),
         phase = if_else(duration >= up    & duration < end  & !is.na(end ) & !is.na(up   ),   "up",   phase))

df <- df %>% 
  select(-c(start, down, lift, up, end, comment, p_type, duration, type))


# select downcasst only
df <- df %>% 
  filter(phase == "down") %>% 
  select(-phase)

df_highres <- df

# grid observation to 1m depth intervals
df <- df %>% 
  mutate(dep_int = as.numeric(as.character( cut(dep, seq(0,40,1), seq(0.5,39.5,1))))) %>% 
  group_by(ID, station, dep_int) %>%
  summarise_all("mean", na.rm = TRUE) %>% 
  ungroup() %>% 
  select(-dep, dep=dep_int)

# subset complete profiles
profiles_in <- df %>% 
  filter(dep < 20) %>% 
  group_by(ID, station) %>% 
  summarise(nr = n()) %>% 
  mutate(select = if_else(nr > 18 | station == "P14", "in", "out")) %>% 
  select(-nr) %>% 
  ungroup()

df <- full_join(df, profiles_in)
rm(profiles_in)

df %>% 
  filter(dep < 30) %>% 
  arrange(date_time) %>% 
  ggplot(aes(pCO2, dep, col=select))+
  geom_point()+
  geom_path()+
  scale_y_reverse()+
  scale_x_continuous(breaks = c(0,300), labels = c(0,300))+
  scale_color_brewer(palette = "Set1", direction = -1)+
  coord_cartesian(xlim = c(0,400))+
  facet_grid(ID~station)
Overview pCO2 profiles at stations (P01-P14) and cruise dates (ID)

Overview pCO2 profiles at stations (P01-P14) and cruise dates (ID)

df <- df %>%
  filter(select == "in") %>%
  select(-select)

1.2 Station map

map <- read_csv(here::here("data/Maps","Bathymetry_Gotland_east_small.csv"))

df %>% 
  ggplot()+
  geom_raster(data=map, aes(lon, lat, fill=-elev))+
  scale_fill_scico(palette = "grayC", na.value = "grey", name="Depth [m]")+
  geom_point(aes(lon, lat, col=station))+
  coord_quickmap(expand = 0, xlim = c(18.7, 19.9), ylim = c(57.25,57.6))+
  theme_bw()+
  theme(legend.position="bottom")
Location of stations sampled between the east coast of Gotland and Gotland deep.

Location of stations sampled between the east coast of Gotland and Gotland deep.

rm(map)

1.3 Data coverage

cover <- df %>% 
  group_by(ID, station) %>% 
  summarise(date = mean(date_time)) %>% 
  ungroup()

cover %>% 
  ggplot(aes(date, station, fill=ID))+
  geom_point(shape=21)+
  scale_fill_viridis_d()
Spatio-temporal data coverage, indicated as station visits over time. ID (color) refers to the starting date of the cruise, except for P14, which was visited twice during each cruise.

Spatio-temporal data coverage, indicated as station visits over time. ID (color) refers to the starting date of the cruise, except for P14, which was visited twice during each cruise.

rm(cover)

2 Bottle CT and AT

At stations P07 and P10 discrete samples for lab measurments of CT and AT were collected. Please note that - in contrast to the pCO2 profiles - samples were taken on June 16.

CO2 <-
  read_csv(here::here("Data/_summarized_data_files", "Tina_V_Bottle_CO2_lab.csv"),
           col_types = cols(ID = col_character()))

CO2 <- CO2 %>% 
  filter(station %in% c("P07", "P10")) %>% 
  select(-pH_Mosley) %>% 
  mutate(CT_AT_ratio = CT/AT)

2.1 Vertical profiles

CO2_long <- CO2 %>% 
  pivot_longer(4:7, names_to = "parameter", values_to = "value")

CO2_long %>% 
  ggplot(aes(value, dep))+
  geom_path(aes(col=ID))+
  geom_point(aes(fill=ID), shape=21)+
  scale_y_reverse()+
  scale_fill_viridis_d()+
  scale_color_viridis_d()+
  facet_grid(station~parameter, scales = "free_x")+
  theme(legend.position = "bottom")

2.2 Surface time series

CO2_ts <- CO2_long %>% 
  filter(dep<10) %>% 
  group_by(ID, parameter, station) %>% 
  summarise(value = mean(value, na.rm = TRUE)) %>% 
  ungroup()

rm(CO2_long)

CO2_ts %>% 
  ggplot(aes(lubridate::ymd(ID), value, col=station))+
  geom_point()+
  geom_path()+
  scale_fill_viridis_d()+
  scale_color_brewer(palette = "Set1")+
  facet_grid(parameter~., scales = "free_y")+
  labs(x="Transect starting date (from ID)")
Time series of bottle data. Shown are mean values of samples collected at water depths < 10m (usually at 0 and 5 m).

Time series of bottle data. Shown are mean values of samples collected at water depths < 10m (usually at 0 and 5 m).

AT_mean <- CO2_ts %>% 
  filter(parameter == "AT") %>% 
  summarise(AT = mean(value, na.rm = TRUE)) %>%
  pull()

CO2_ts %>% 
  filter(parameter == "CT_AT_ratio") %>% 
  ggplot(aes(lubridate::ymd(ID), value*AT_mean, col=station))+
  geom_point()+
  geom_path()+
  scale_fill_viridis_d()+
  scale_color_brewer(palette = "Set1")+
  labs(x="Transect starting date (from ID)", y="CT-AT-ratio * mean AT")
CT timeseries, derived by multiplying the CT-AT-ratio with mean AT

CT timeseries, derived by multiplying the CT-AT-ratio with mean AT

2.3 Mean alkalinity

In order to derive CT from measured pCO2 profiles, the mean alkalinity in the upper 20 m and both stations was calculated as:

AT_mean <- CO2 %>% 
  filter(dep <= 20) %>% 
  summarise(AT = mean(AT, na.rm = TRUE)) %>%
  pull()

AT_mean
[1] 1716.205

Likewise, the mean salinity amounts to:

sal_mean <- CO2 %>% 
  filter(dep <= 20) %>% 
  summarise(sal = mean(sal, na.rm = TRUE)) %>%
  pull()

sal_mean
[1] 6.920357

3 CT profiles

3.1 Calculation from pCO2

CT profiles were calculated from sensor pCO2 and T profiles, and constant salinity and alkalinity values. Note that the impact of fixed vs. measured salinity has only a negligible impact on CT profiles.

df <- df %>% 
  drop_na()

df <- df %>% 
  filter(pCO2 > 0)

df <- df %>% 
  mutate(CT = carb(24, var1=pCO2, var2=1720*1e-6,
                   S=sal_mean, T=tem, P=dep/10, k1k2="m10", kf="dg", ks="d",
                   gas="insitu")[,16]*1e6)

rm(sal_mean, AT_mean)

df %>% 
  write_csv(here::here("Data/_merged_data_files", "BloomSail_CTD_HydroC_CT.csv"))

3.2 Mean profiles

Mean vertical profiles were calculated for each cruise day (ID). Note that:

  • ID represents the start date of the cruise, not the exact mean sampling date
  • Coastal station P14 was excluded so far from the analysis
# df %>% 
#   filter(dep < 20) %>% 
#   arrange(date_time) %>% 
#   ggplot(aes(CT, dep))+
#   geom_point()+
#   geom_path()+
#   scale_y_reverse()+
#   coord_cartesian(ylim = c(30,0))+
#   facet_grid(station~ID)

mean_profiles <- df %>% 
  filter(station != "P14", dep < 25) %>% 
  select(-c(station,lat, lon, pCO2_raw)) %>% 
  group_by(ID, dep) %>% 
  summarise_all(list(mean), na.rm=TRUE) %>% 
  ungroup()

mean_profiles_long <- mean_profiles %>% 
  pivot_longer(4:7, names_to = "parameter", values_to = "value")
  
mean_profiles_long %>% 
  ggplot(aes(value, dep, col=ID))+
  geom_point()+
  geom_path()+
  scale_y_reverse()+
  scale_color_viridis_d()+
  facet_wrap(~parameter, scales = "free_x")
Mean vertical profiles per cruise day across all stations, except P14.

Mean vertical profiles per cruise day across all stations, except P14.

3.3 Individual profiles

CT, pCO2, S, and T profiles were plotted individually pdf here and grouped by ID pdf here. The later gives an idea of the differences between stations at one point in time.

pdf(file=here::here("output/Plots/CT_dynamics",
    "profiles_individual.pdf"), onefile = TRUE, width = 9, height = 5)

for(i_ID in unique(df$ID)){
  for(i_station in unique(df$station)){

    if (nrow(df %>% filter(ID == i_ID, station == i_station)) > 0){
      
      
      # i_ID      <-      unique(df$ID)[1]
      # i_station <- unique(df$station)[1]

      p_pCO2 <- 
        df %>%
        arrange(date_time) %>% 
        filter(ID == i_ID,
               station == i_station) %>%
        ggplot(aes(pCO2, dep, col="grid_RT"))+
        geom_point(data = df_highres %>% arrange(date_time) %>% filter(ID == i_ID, station == i_station),
                   aes(pCO2_raw, dep, col="raw"))+
        geom_point(data = df_highres %>% arrange(date_time) %>% filter(ID == i_ID, station == i_station),
                   aes(pCO2, dep, col="raw_RT"))+
        geom_point(aes(pCO2_raw, dep, col="grid"))+
        geom_point()+
        geom_path()+
        scale_y_reverse()+
        scale_color_brewer(palette = "Set1")+
        labs(y="Depth [m]", x="pCO2 [µatm]", title = str_c(i_ID," | ",i_station))+
        coord_cartesian(xlim = c(0,200), ylim = c(30,0))+
        theme_bw()+
        theme(legend.position = "left")
      
      p_tem <- 
        df %>%
        arrange(date_time) %>% 
        filter(ID == i_ID,
               station == i_station) %>%
        ggplot(aes(tem, dep))+
        geom_point()+
        geom_path()+
        scale_y_reverse()+
        labs(y="Depth [m]", x="Tem [°C]")+
        coord_cartesian(xlim = c(14,26), ylim = c(30,0))+
        theme_bw()
      
      p_sal <- 
        df %>%
        arrange(date_time) %>% 
        filter(ID == i_ID,
               station == i_station) %>%
        ggplot(aes(sal, dep))+
        geom_point()+
        geom_path()+
        scale_y_reverse()+
        labs(y="Depth [m]", x="Tem [°C]")+
        coord_cartesian(xlim = c(6.5,7.5), ylim = c(30,0))+
        theme_bw()
      
      p_CT <- 
        df %>%
        arrange(date_time) %>% 
        filter(ID == i_ID,
               station == i_station) %>%
        ggplot(aes(CT, dep))+
        geom_point()+
        geom_path()+
        scale_y_reverse()+
        labs(y="Depth [m]", x="CT* [µmol/kg]")+
        coord_cartesian(xlim = c(1400,1700), ylim = c(30,0))+
        theme_bw()
      

      print(
            p_pCO2 + p_tem + p_sal + p_CT
            )
      
      rm(p_pCO2, p_sal, p_tem, p_CT)

      
    }
  }
}

dev.off()

rm(i_ID, i_station)
df_long <- df %>%
  select(-c(lat, lon, pCO2_raw)) %>% 
  filter(dep < 25) %>% 
  pivot_longer(5:8, values_to = "value", names_to = "parameter")


pdf(file=here::here("output/Plots/CT_dynamics",
    "profiles_by_ID.pdf"), onefile = TRUE, width = 9, height = 5)

for(i_ID in unique(df$ID)){

  #i_ID <- unique(df$ID)[1]
  
  sub_df_long <- df_long %>% 
        arrange(date_time) %>% 
        filter(ID == i_ID)
 
  print(
  
  sub_df_long %>% 
    ggplot()+
    geom_path(data = df_long, aes(value, dep, group=interaction(station, ID)), col="grey")+
    geom_path(aes(value, dep, col=station))+
    scale_y_reverse()+
    labs(y="Depth [m]", title = str_c("ID: ", i_ID))+
    theme_bw()+
    facet_wrap(~parameter, scales = "free_x")
   
  )  
  rm(sub_df_long)
}

dev.off()

rm(i_ID, df_long)

3.4 Profiles of incremental changes

Changes of seawater parameters at each depth are calculated from one cruise day to the next and divided by the number of days inbetween.

mean_profiles_long <- mean_profiles_long %>%
    group_by(parameter, dep) %>%
    arrange(date_time) %>%
    mutate(diff_value = value     - lag(value, default = first(value)),
           diff_time  = as.numeric(date_time - lag(date_time)),
           diff_value_daily = diff_value / diff_time,
           cum_value = cumsum(diff_value)) %>% 
  ungroup()

mean_profiles_long %>% 
  arrange(dep) %>% 
  ggplot(aes(diff_value_daily, dep, col=ID))+
  geom_vline(xintercept = 0)+
  geom_point()+
  geom_path()+
  scale_y_reverse()+
  scale_color_viridis_d()+
  facet_wrap(~parameter, scales = "free_x")+
  labs(x="Change of value inbetween cruises per day")

3.5 Profiles of cumulative changes

Cumulative changes of seawater parameters were calculated at each depth relative to the first cruise day on July 5.

mean_profiles_long %>% 
  arrange(dep) %>% 
  ggplot(aes(cum_value, dep, col=ID))+
  geom_vline(xintercept = 0)+
  geom_point()+
  geom_path()+
  scale_y_reverse()+
  scale_color_viridis_d()+
  facet_wrap(~parameter, scales = "free_x")+
  labs(x="Cumulative change of value")

Cumulative positive and negative changes of seawater parameters were calculated separately at each depth relative to the first cruise day on July 5.

mean_profiles_long <- mean_profiles_long %>% 
  mutate(sign = if_else(diff_value < 0, "neg", "pos")) %>% 
  group_by(parameter, dep, sign) %>%
  arrange(date_time) %>%
  mutate(cum_value_sign = cumsum(diff_value)) %>% 
  ungroup()

mean_profiles_long %>% 
  arrange(dep) %>% 
  ggplot(aes(cum_value_sign, dep, col=ID))+
  geom_vline(xintercept = 0)+
  geom_point()+
  geom_path()+
  scale_y_reverse()+
  scale_color_viridis_d()+
  scale_fill_viridis_d()+
  facet_wrap(~interaction(sign, parameter), scales = "free_x", ncol=4)+
  labs(x="Cumulative directional change of value")

4 Timeseries

4.1 Observed

Timeseries of changes in seawater parameters were calculated for 5m depth intervals.

timeseries <- mean_profiles_long %>% 
  mutate(dep = cut(dep, seq(0,30,5))) %>% 
  group_by(ID, dep, parameter)  %>% 
  summarise_all(list(mean), na.rm=TRUE) 

timeseries %>% 
  ggplot(aes(date_time, value, col=as.factor(dep)))+
  geom_path()+
  geom_point()+
  scale_color_viridis_d(name="Depth [m]")+
  facet_wrap(~parameter, scales = "free_y", ncol=1)

4.2 Incremental changes

Total incremental CT changes inbetween cruise dates were calculated for 5m depth intervals.

NCP <- mean_profiles_long %>% 
  filter(parameter == "CT") %>% 
  mutate(dep = cut(dep, seq(0,30,5))) %>% 
  group_by(ID, dep, sign) %>% 
  summarise(date_time = mean(date_time),
            dCT = sum(cum_value_sign)/1000) %>% 
  ungroup()

NCP <- NCP %>% 
  group_by(sign, dep) %>% 
  arrange(date_time) %>%
  mutate(dCT_cum = cumsum(dCT)) %>% 
  ungroup()


NCP_grid <- expand_grid(
  unique(NCP$ID),
  unique(NCP$dep),
  unique(NCP$sign)
)

NCP_grid <- NCP_grid %>% 
  set_names(c("ID", "dep", "sign"))

NCP <- full_join(NCP, NCP_grid)

NCP <- NCP %>% 
  arrange(sign, dep, ID) %>% 
  group_by(sign, dep) %>% 
  fill(dCT_cum) %>% 
  ungroup() %>% 
  mutate(dCT_cum = if_else(is.na(dCT_cum), 0, dCT_cum))
NCP %>% 
  ggplot(aes(lubridate::ymd(ID), dCT, fill=dep))+
  geom_hline(yintercept = 0)+
  geom_bar(stat="identity")+
  scale_fill_viridis_d()+
  scale_color_viridis_d()+
  scale_y_continuous(breaks = seq(-100, 100, 1))+
  facet_grid(rev(sign)~., scales = "free_y", space = "free_y")+
  theme(strip.background = element_blank(),
        strip.text = element_blank())+
  labs(y="integrated, directional CT changes [mol/m2]", x="date")

4.3 Cumulative changes

Cumulative CT changes were calculated for 5m depth intervals.

NCP %>% 
  ggplot(aes(lubridate::ymd(ID), dCT_cum, fill=dep))+
  geom_hline(yintercept = 0)+
  geom_area(alpha = 0.8, col="white")+
  scale_fill_viridis_d()+
  scale_color_viridis_d()+
  scale_y_continuous(breaks = seq(-100, 100, 1))+
  facet_grid(rev(sign)~., scales = "free_y", space = "free_y")+
  theme(strip.background = element_blank(),
        strip.text = element_blank())+
  labs(y="integrated, cumulative, directional CT changes [mol/m2]", x="date")

mean_profiles %>% 
  ggplot(aes(date_time, dep, col=CT))+
  geom_point()+
  scale_color_viridis_c(direction = -1)+
  scale_y_reverse()


mean_profiles_long %>%
  filter(parameter == "CT") %>% 
  ggplot(aes(date_time, dep, col=diff))+
  geom_point()+
  scale_color_divergent()+
  scale_y_reverse()

mean_profiles_long %>%
  filter(parameter == "tem") %>% 
  ggplot(aes(date_time, dep, col=diff))+
  geom_point()+
  scale_color_divergent()+
  scale_y_reverse()

5 Open tasks / questions

  • Significance of changes in AT for calculated CT changes
  • Harmonize selection of profiles for tau optimization and BGC interpretation (how many missing discrete depth intervals are allowed?)
  • Use exact mean date instead of ID throughout

sessionInfo()
R version 3.5.0 (2018-04-23)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 18363)

Matrix products: default

locale:
[1] LC_COLLATE=English_United States.1252 
[2] LC_CTYPE=English_United States.1252   
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C                          
[5] LC_TIME=English_United States.1252    

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

other attached packages:
 [1] scico_1.1.0     metR_0.5.0      seacarb_3.2.12  oce_1.2-0      
 [5] gsw_1.0-5       testthat_2.3.1  patchwork_1.0.0 forcats_0.4.0  
 [9] stringr_1.4.0   dplyr_0.8.3     purrr_0.3.3     readr_1.3.1    
[13] tidyr_1.0.0     tibble_2.1.3    ggplot2_3.3.0   tidyverse_1.3.0

loaded via a namespace (and not attached):
 [1] nlme_3.1-137         bitops_1.0-6         fs_1.3.1            
 [4] lubridate_1.7.4      RColorBrewer_1.1-2   httr_1.4.1          
 [7] rprojroot_1.3-2      tools_3.5.0          backports_1.1.5     
[10] R6_2.4.0             DBI_1.0.0            colorspace_1.4-1    
[13] withr_2.1.2          sp_1.3-2             tidyselect_0.2.5    
[16] gridExtra_2.3        compiler_3.5.0       git2r_0.26.1        
[19] cli_1.1.0            rvest_0.3.5          xml2_1.2.2          
[22] labeling_0.3         scales_1.0.0         checkmate_1.9.4     
[25] digest_0.6.22        foreign_0.8-70       rmarkdown_2.0       
[28] pkgconfig_2.0.3      htmltools_0.4.0      dbplyr_1.4.2        
[31] highr_0.8            maps_3.3.0           rlang_0.4.5         
[34] readxl_1.3.1         rstudioapi_0.10      generics_0.0.2      
[37] jsonlite_1.6         RCurl_1.95-4.12      magrittr_1.5        
[40] Formula_1.2-3        dotCall64_1.0-0      Matrix_1.2-14       
[43] Rcpp_1.0.2           munsell_0.5.0        lifecycle_0.1.0     
[46] stringi_1.4.3        yaml_2.2.0           plyr_1.8.4          
[49] grid_3.5.0           maptools_0.9-8       formula.tools_1.7.1 
[52] promises_1.1.0       crayon_1.3.4         lattice_0.20-35     
[55] haven_2.2.0          hms_0.5.2            zeallot_0.1.0       
[58] knitr_1.26           pillar_1.4.2         reprex_0.3.0        
[61] glue_1.3.1           evaluate_0.14        data.table_1.12.6   
[64] modelr_0.1.5         operator.tools_1.6.3 vctrs_0.2.0         
[67] spam_2.3-0.2         httpuv_1.5.2         cellranger_1.1.0    
[70] gtable_0.3.0         assertthat_0.2.1     xfun_0.10           
[73] broom_0.5.3          later_1.0.0          viridisLite_0.3.0   
[76] memoise_1.1.0        fields_9.9           workflowr_1.6.0     
[79] ellipsis_0.3.0       here_0.1