Last updated: 2023-12-06

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Knit directory: bgc_argo_r_argodata/

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Task

This markdown file reads previously created pH climatology file and uses that as the definition of the depth levels that the Argo dissolved oxygen data should be aligned to. Previously created BGC data (bgc_data.rds) and metadata (bgc_metadata.rds) are loaded from the BGC preprocessed folder.

Base data qc flags are checked to ensure that the float position, pressure measurements and dissolved oxygen measurements are good. Pressure is used to derive the depth of each measurement. The dissolved oxygen profile is checked to ensure that significant gaps (specified by the opt_gap_limit, opt_gap_min_depth and opt_gap_max_depth) do not exist. Profiles are assigned a profile_range field that identifies the depth 1 = 614 m, 2 = 1225 m and 3 = 1600 m.

The float dissolved oxygen profiles are then aligned using the spline function to match the depth levels of the climatology resulting in data frame bgc_data_doxy_interpolated_clean.

Set directories

location of pre-prepared data

Set options

Define options that are used to determine profiles that we will us in the ongoing analysis

# Options

# opt_profile_depth_range
# The profile must have at least one doxy reading at a depth <= opt_profile_depth_range[1, ]
# The profile must have at least one doxy reading at a depth >= opt_profile_depth_range[2, ].
# In addition if the profile depth does not exceed the min(opt_profile_depth_range[2, ]) (i.e. 600) it will be removed.
profile_range <- c(1, 2, 3)
min_depth <- c(10, 10, 10)
max_depth <- c(614, 1225, 1600)
opt_profile_depth_range <- data.frame(profile_range, min_depth, max_depth)

# opt_gap...
# The profile should not have a gap greater that opt_gap_limit within the range defined by opt_gap_min_depth and opt_gap_max_depth
opt_gap_limit <- c(28, 55, 110)
opt_gap_min_depth <- c(0, 400, 1000)
opt_gap_max_depth <- c(400, 1000, 1600)

# opt_measure_label, opt_xlim and opt_xbreaks are associated formatting
opt_measure_label <- expression("dissolved oxygen ( µmol kg"^"-1"~")")
opt_xlim <- c(50, 350)
opt_xbreaks <- c(50, 100, 150, 200, 250, 300, 350)

# opt_n_prof_sel
# The selection criteria that is used against n_prof, here set to 1
# Description of n_prof usage is provided at https://argo.ucsd.edu/data/data-faq/version-3-profile-files/ the next two lines are from that page.
#     The main Argo CTD profile is stored in N_PROF=1. All other parameters (including biogeochemical parameters) that are measured 
#     with the same vertical sampling scheme and at the same location and time as the main Argo CTD profile are also stored in N_PROF=1.
opt_n_prof_sel = 1

read climatology

read pH climatology, values are provided at set depths

# climatology values (pH_clim_va) available for lat, lon, month and depth
pH_clim_va <- read_rds(file = paste0(path_argo_preprocessed, "/pH_clim_va.rds"))

# What is the max depth we are interested in
opt_profile_max_depth <- max(opt_profile_depth_range$max_depth)

# existing depth levels that we will align to
target_depth_levels <-   pH_clim_va %>%
  filter(depth <= opt_profile_max_depth) %>%
  rename(target_depth = depth) %>%
  distinct(target_depth)

rm(pH_clim_va)
gc()
          used (Mb) gc trigger  (Mb) max used  (Mb)
Ncells 1276535 68.2    2476715 132.3  2476715 132.3
Vcells 2192738 16.8   91952148 701.6 92803266 708.1

read doxy data

read doxy profile and carry out basic checks, good data.

# base data and associated metadata
bgc_data <- read_rds(file = paste0(path_argo_preprocessed, '/bgc_data.rds'))
bgc_metadata <- read_rds(file = paste0(path_argo_preprocessed, '/bgc_metadata.rds'))

# Select relevant field from metadata ready to join to bgc_data
bgc_metadata_select <- bgc_metadata %>%
  filter(position_qc == 1) %>%
  select(file_id,
         date,
         lat,
         lon) %>%
  mutate(year = year(date),
         month = month(date),
         .after = date)

# we drive alignment from pressure and doxy data
# conditions 
# n_prof == 1
# pres_adjusted_qc %in% c(1, 8) - pressure data marked as good
# doxy_adjusted_qc %in% c(1, 8) - doxy data marked as good
# !is.na(pres_adjusted) - pressure value must be present
# !is.na(doxy_adjusted) - doxy value must be present
bgc_data_doxy <- bgc_data %>%
  filter(
    pres_adjusted_qc %in% c(1, 8) &
      doxy_adjusted_qc %in% c(1, 8) &
      n_prof == opt_n_prof_sel &
      !is.na(pres_adjusted) &
      !is.na(doxy_adjusted)
  ) %>%
  select(file_id,
         pres_adjusted,
         doxy_adjusted)

# join with metadata information and calculate depth field
bgc_data_doxy <- inner_join(bgc_metadata_select %>% select(file_id, lat),
                          bgc_data_doxy) %>%
  mutate(depth = gsw_z_from_p(pres_adjusted, latitude = lat) * -1.0,
         .before = pres_adjusted) %>%
  select(-c(lat, pres_adjusted))

# ensure we have a depth, and doxy_adjusted for all rows in bgc_data_doxy
bgc_data_doxy <- bgc_data_doxy %>%
                  filter(!is.na(depth) & !is.na(doxy_adjusted))

# clean up working tables
rm(bgc_data, bgc_metadata)
gc()
           used  (Mb) gc trigger    (Mb)   max used    (Mb)
Ncells  1313120  70.2    2476715   132.3    2476715   132.3
Vcells 71918833 548.7 3356060008 25604.8 3484793727 26586.9

Profile limits

Apply the rules that are determined by options set in set_options. Profile must cover a set range and not contain gaps.

# Determine profile min and max depths
bgc_profile_limits <- bgc_data_doxy %>%
  group_by(file_id) %>%
  summarise(
    min_depth = min(depth),
    max_depth = max(depth),
  ) %>%
  ungroup()

# The profile much match at least one of the range criteria
force_min <- min(opt_profile_depth_range$min_depth)
force_max <- min(opt_profile_depth_range$max_depth)

# Apply profile min and max restrictions
bgc_apply_limits <- bgc_profile_limits %>%
  filter(
    min_depth <= force_min &
    max_depth >= force_max
    )

# Ensure working data set only contains profiles that have confrormed to the range test
bgc_data_doxy <- right_join(bgc_data_doxy,
                          bgc_apply_limits %>% select(file_id))


# Add profile type field and set all to 1.  
# All profile that meet the minimum requirements are profile_range = 1
bgc_data_doxy <- bgc_data_doxy %>%
  mutate(profile_range = 1)

for (i in 2:nrow(opt_profile_depth_range)) {

  #i = 3
  range_min <- opt_profile_depth_range[i,'min_depth']
  range_max <- opt_profile_depth_range[i,'max_depth']

  # Apply profile min and max restrictions
  bgc_apply_limits <- bgc_profile_limits %>%
    filter(min_depth <= range_min &
             max_depth >= range_max) %>%
    select(file_id) %>%
    mutate (profile_range = i)

  # Update profile range to i for these profiles
  # bgc_data_temp <- full_join(bgc_data_temp, bgc_apply_limits) %>%
  #                         filter(!is.na(min_depth))
  bgc_data_doxy <-
    bgc_data_doxy %>% rows_update(bgc_apply_limits, by = "file_id")
  
}

# Find the gaps within the profiles
profile_gaps <- full_join(bgc_data_doxy,
                          opt_profile_depth_range) %>%
  filter(depth >= min_depth & 
           depth <= max_depth) %>% 
  select(file_id,
         depth) %>%
  arrange(file_id, depth) %>%
  group_by(file_id) %>%
  mutate(gap = depth - lag(depth, default = 0)) %>%
  ungroup()

# Ensure we do not have gaps in the profile that invalidate it 
for (i_gap in opt_gap_limit) {

  # The limits to be applied in that pass of for loop
  # i_gap <- opt_gap_limit[3]
  i_gap_min = opt_gap_min_depth[which(opt_gap_limit == i_gap)]
  i_gap_max = opt_gap_max_depth[which(opt_gap_limit == i_gap)]
  
  # Which gaps are greater than i_gap
  profile_gaps_remove <- profile_gaps %>%
    filter(gap > i_gap) %>%
    filter(depth >= i_gap_min & depth <= i_gap_max) %>%
    distinct(file_id) %>% 
    pull()
  
  # Remonve these profiles from working data set
  bgc_data_doxy <- bgc_data_doxy %>% 
    filter(!file_id %in% profile_gaps_remove)

}

# clean up working tables
rm(bgc_profile_limits, profile_gaps, profile_gaps_remove, bgc_apply_limits)
gc()
           used  (Mb) gc trigger    (Mb)   max used    (Mb)
Ncells  1328238  71.0    2476715   132.3    2476715   132.3
Vcells 92807295 708.1 2684848007 20483.8 3484793727 26586.9
# Write file that are observations prior to vertical alignment 
bgc_data_doxy_full <- left_join(bgc_data_doxy, bgc_metadata_select)

bgc_data_doxy_full %>%
  select(file_id, lat, lon, date, year, month, depth, doxy_adjusted) %>%
  write_rds(file = paste0(path_argo_preprocessed, "/doxy_bgc_observed.rds"))

rm(bgc_data_doxy_full)
gc()
           used  (Mb) gc trigger    (Mb)   max used    (Mb)
Ncells  1328614  71.0    2476715   132.3    2476715   132.3
Vcells 92808056 708.1 2147878406 16387.1 3484793727 26586.9

Vertical align doxy

We have a set of doxy profiles that match our criteria we now need to align that data set to match the depth that are in target_depth_range, this will match the range of climatology values in ucsd_clim

# create unique combinations of file_id and profile ranges
profile_range_file_id <- 
  bgc_data_doxy %>% 
  distinct(file_id, profile_range)


# select variable of interest and prepare target_depth field
bgc_data_doxy_clean <- bgc_data_doxy %>%
  select(-profile_range) %>%
  mutate(target_depth = depth, .after = depth)

rm(bgc_data_doxy)
gc()
           used (Mb) gc trigger    (Mb)   max used    (Mb)
Ncells  1328258   71    2476715   132.3    2476715   132.3
Vcells 67367051  514 1718302725 13109.7 3484793727 26586.9
# create all possible combinations of location, month and depth levels for interpolation
target_depth_grid <-
  expand_grid(
    target_depth_levels,
    profile_range_file_id
  )

# Constrain target_depth_grid to profile depth range
target_depth_grid <-
  left_join(target_depth_grid, opt_profile_depth_range) %>%
  filter(target_depth <= max_depth)

target_depth_grid <- target_depth_grid %>%
  select(target_depth,
         file_id)

# extend doxy depth vectors with target depths
bgc_data_doxy_extended <-
  full_join(bgc_data_doxy_clean, target_depth_grid) %>%
  arrange(file_id, target_depth)

rm(bgc_data_doxy_clean)
gc()
            used  (Mb) gc trigger    (Mb)   max used    (Mb)
Ncells   1330427  71.1    2476715   132.3    2476715   132.3
Vcells 112806447 860.7 1374642180 10487.7 3484793727 26586.9
# predict spline interpolation on adjusted depth grid for doxy location and month
bgc_data_doxy_interpolated <-
  bgc_data_doxy_extended %>%
  group_by(file_id) %>%
  mutate(doxy_spline = spline(target_depth, doxy_adjusted,
                                method = "natural",
                                xout = target_depth)$y) %>%
  ungroup()

rm(bgc_data_doxy_extended)
gc()
            used   (Mb) gc trigger   (Mb)   max used    (Mb)
Ncells   1332199   71.2    3119584  166.7    3119584   166.7
Vcells 142379849 1086.3  879770996 6712.2 3484793727 26586.9
# subset interpolated values on target depth range
bgc_data_doxy_interpolated_clean <- 
  inner_join(target_depth_levels, bgc_data_doxy_interpolated)

rm(bgc_data_doxy_interpolated)
gc()
           used  (Mb) gc trigger   (Mb)   max used    (Mb)
Ncells  1332246  71.2    3119584  166.7    3119584   166.7
Vcells 27168616 207.3  703816797 5369.7 3484793727 26586.9
# select columns and rename to initial names
bgc_data_doxy_interpolated_clean <-
  bgc_data_doxy_interpolated_clean %>%
  select(file_id,
         depth = target_depth,
         doxy = doxy_spline)

# merge with profile range
bgc_data_doxy_interpolated_clean <-
  full_join(bgc_data_doxy_interpolated_clean,
            profile_range_file_id)

# merge with meta data
bgc_data_doxy_interpolated_clean <-
  left_join(bgc_data_doxy_interpolated_clean,
            bgc_metadata_select)

Write files

Write the interpolated doxy profiles that map onto depth levels.

# Write files
bgc_data_doxy_interpolated_clean %>%
  write_rds(file = paste0(path_argo_preprocessed, "/doxy_bgc_va.rds"))

# Rename so that names match if just reading existing files
doxy_bgc_va <- bgc_data_doxy_interpolated_clean

rm(bgc_data_doxy_interpolated_clean)
gc()
           used  (Mb) gc trigger   (Mb)   max used    (Mb)
Ncells  1331875  71.2    3119584  166.7    3119584   166.7
Vcells 43032647 328.4  563053438 4295.8 3484793727 26586.9

read files

Read files that were previously created ready for analysis

# read files
doxy_bgc_va <- read_rds(file = paste0(path_argo_preprocessed, "/doxy_bgc_va.rds"))

Analysis

doxy mean profile

max_depth_1 <- opt_profile_depth_range[1, "max_depth"]
max_depth_2 <- opt_profile_depth_range[2, "max_depth"]
max_depth_3 <- opt_profile_depth_range[3, "max_depth"]

# Profiles to 600m
doxy_overall_mean_1 <- doxy_bgc_va %>% 
  filter(profile_range %in% c(1, 2, 3) & depth <= max_depth_1) %>%
  group_by(depth) %>% 
  summarise(count_measures = n(),
            doxy_mean = mean(doxy, na.rm = TRUE),
            doxy_sd = sd(doxy, na.rm = TRUE))

doxy_year_mean_1 <- doxy_bgc_va %>% 
  filter(profile_range %in% c(1, 2, 3) & depth <= max_depth_1) %>%
  group_by(year, depth) %>% 
  summarise(count_measures = n(),
            doxy_mean = mean(doxy, na.rm = TRUE),
            doxy_sd = sd(doxy, na.rm = TRUE))

# Profiles to 1200m
doxy_overall_mean_2 <- doxy_bgc_va %>% 
  filter(profile_range %in% c(2, 3) & depth <= max_depth_2) %>%
  group_by(depth) %>% 
  summarise(count_measures = n(),
            doxy_mean = mean(doxy, na.rm = TRUE),
            doxy_sd = sd(doxy, na.rm = TRUE))

doxy_year_mean_2 <- doxy_bgc_va %>% 
  filter(profile_range %in% c(2, 3) & depth <= max_depth_2) %>%
  group_by(year, depth) %>% 
  summarise(count_measures = n(),
            doxy_mean = mean(doxy, na.rm = TRUE),
            doxy_sd = sd(doxy, na.rm = TRUE))

# Profiles to 1500m
doxy_overall_mean_3 <- doxy_bgc_va %>% 
  filter(profile_range %in% c(3) & depth <= max_depth_3) %>%
  group_by(depth) %>% 
  summarise(count_measures = n(),
            doxy_mean = mean(doxy, na.rm = TRUE),
            doxy_sd = sd(doxy, na.rm = TRUE))

doxy_year_mean_3 <- doxy_bgc_va %>% 
  filter(profile_range %in% c(3) & depth <= max_depth_3) %>%
  group_by(year, depth) %>% 
  summarise(count_measures = n(),
            doxy_mean = mean(doxy, na.rm = TRUE),
            doxy_sd = sd(doxy, na.rm = TRUE))

# All years
doxy_overall_mean_1 %>% 
  ggplot()+
  geom_path(aes(x = doxy_mean,
                y = depth))+
  geom_ribbon(aes(
    xmax = doxy_mean + doxy_sd,
    xmin = doxy_mean - doxy_sd,
    y = depth
  ),
  alpha = 0.2) +
  scale_y_reverse()+
  coord_cartesian(xlim = opt_xlim)+
  scale_x_continuous(breaks = opt_xbreaks)+
  labs(
    title = paste0('Overall mean dissolved oxygen to ', max_depth_1, 'm'), 
    x=opt_measure_label, 
    y='depth (m)'
  )

Version Author Date
80c16c2 ds2n19 2023-11-15
doxy_overall_mean_2 %>% 
  ggplot()+
  geom_path(aes(x = doxy_mean,
                y = depth))+
  geom_ribbon(aes(
    xmax = doxy_mean + doxy_sd,
    xmin = doxy_mean - doxy_sd,
    y = depth
  ),
  alpha = 0.2) +
  scale_y_reverse()+
  coord_cartesian(xlim = opt_xlim)+
  scale_x_continuous(breaks = opt_xbreaks)+
  labs(
    title = paste0('Overall mean dissolved oxygen to ', max_depth_2, 'm'), 
    x=opt_measure_label, 
    y='depth (m)'
  )

Version Author Date
80c16c2 ds2n19 2023-11-15
doxy_overall_mean_3 %>% 
  ggplot()+
  geom_path(aes(x = doxy_mean,
                y = depth))+
  geom_ribbon(aes(
    xmax = doxy_mean + doxy_sd,
    xmin = doxy_mean - doxy_sd,
    y = depth
  ),
  alpha = 0.2) +
  scale_y_reverse()+
  coord_cartesian(xlim = opt_xlim)+
  scale_x_continuous(breaks = opt_xbreaks)+
  labs(
    title = paste0('Overall mean dissolved oxygen to ', max_depth_3, 'm'), 
    x=opt_measure_label, 
    y='depth (m)'
  )

Version Author Date
80c16c2 ds2n19 2023-11-15
# by years
doxy_year_mean_1 %>% 
  ggplot()+
  geom_path(aes(x = doxy_mean,
                y = depth))+
  geom_ribbon(aes(
    xmax = doxy_mean + doxy_sd,
    xmin = doxy_mean - doxy_sd,
    y = depth
  ),
  alpha = 0.2) +
  scale_y_reverse()+
  facet_wrap(~year)+
  coord_cartesian(xlim = opt_xlim)+
  scale_x_continuous(breaks = opt_xbreaks)+
  labs(
    title = paste0('Yearly overall mean dissolved oxygen to ', max_depth_1, 'm'),
    x = opt_measure_label,
    y = 'depth (m)'
  )

Version Author Date
80c16c2 ds2n19 2023-11-15
doxy_year_mean_2 %>% 
  ggplot()+
  geom_path(aes(x = doxy_mean,
                y = depth))+
  geom_ribbon(aes(
    xmax = doxy_mean + doxy_sd,
    xmin = doxy_mean - doxy_sd,
    y = depth
  ),
  alpha = 0.2) +
  scale_y_reverse()+
  facet_wrap(~year)+
  coord_cartesian(xlim = opt_xlim)+
  scale_x_continuous(breaks = opt_xbreaks)+
  labs(
    title = paste0('Yearly overall mean dissolved oxygen to ', max_depth_2, 'm'),
    x = opt_measure_label,
    y = 'depth (m)'
  )

Version Author Date
80c16c2 ds2n19 2023-11-15
doxy_year_mean_3 %>% 
  ggplot()+
  geom_path(aes(x = doxy_mean,
                y = depth))+
  geom_ribbon(aes(
    xmax = doxy_mean + doxy_sd,
    xmin = doxy_mean - doxy_sd,
    y = depth
  ),
  alpha = 0.2) +
  scale_y_reverse()+
  facet_wrap(~year)+
  coord_cartesian(xlim = opt_xlim)+
  scale_x_continuous(breaks = opt_xbreaks)+
  labs(
    title = paste0('Yearly overall mean dissolved oxygen to ', max_depth_3, 'm'),
    x = opt_measure_label,
    y = 'depth (m)'
  )

Version Author Date
80c16c2 ds2n19 2023-11-15

Profile counts

Details of the number of profiles and to which depths over the analysis period

doxy_histogram <- doxy_bgc_va %>%
  group_by(year, profile_range = as.character(profile_range)) %>%
  summarise(num_profiles = n_distinct(file_id)) %>%
  ungroup()

doxy_histogram %>%
  ggplot() +
  geom_bar(
    aes(
      x = year,
      y = num_profiles,
      fill = profile_range,
      group = profile_range
    ),
    position = "stack",
    stat = "identity"
  ) +
  scale_fill_viridis_d() +
  labs(title = "dissolved oxygen profiles per year and profile range",
       x = "year",
       y = "profile count",
       fill = "profile range")

Version Author Date
80c16c2 ds2n19 2023-11-15

sessionInfo()
R version 4.2.2 (2022-10-31)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: openSUSE Leap 15.5

Matrix products: default
BLAS:   /usr/local/R-4.2.2/lib64/R/lib/libRblas.so
LAPACK: /usr/local/R-4.2.2/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] gsw_1.1-1        gridExtra_2.3    lubridate_1.9.0  timechange_0.1.1
 [5] argodata_0.1.0   forcats_0.5.2    stringr_1.5.0    dplyr_1.1.3     
 [9] purrr_1.0.2      readr_2.1.3      tidyr_1.3.0      tibble_3.2.1    
[13] ggplot2_3.4.4    tidyverse_1.3.2 

loaded via a namespace (and not attached):
 [1] Rcpp_1.0.10         assertthat_0.2.1    rprojroot_2.0.3    
 [4] digest_0.6.30       utf8_1.2.2          R6_2.5.1           
 [7] cellranger_1.1.0    backports_1.4.1     reprex_2.0.2       
[10] evaluate_0.18       highr_0.9           httr_1.4.4         
[13] pillar_1.9.0        rlang_1.1.1         googlesheets4_1.0.1
[16] readxl_1.4.1        rstudioapi_0.15.0   whisker_0.4        
[19] jquerylib_0.1.4     rmarkdown_2.18      labeling_0.4.2     
[22] googledrive_2.0.0   munsell_0.5.0       broom_1.0.5        
[25] compiler_4.2.2      httpuv_1.6.6        modelr_0.1.10      
[28] xfun_0.35           pkgconfig_2.0.3     htmltools_0.5.3    
[31] tidyselect_1.2.0    workflowr_1.7.0     viridisLite_0.4.1  
[34] fansi_1.0.3         crayon_1.5.2        withr_2.5.0        
[37] tzdb_0.3.0          dbplyr_2.2.1        later_1.3.0        
[40] grid_4.2.2          jsonlite_1.8.3      gtable_0.3.1       
[43] lifecycle_1.0.3     DBI_1.1.3           git2r_0.30.1       
[46] magrittr_2.0.3      scales_1.2.1        cli_3.6.1          
[49] stringi_1.7.8       cachem_1.0.6        farver_2.1.1       
[52] fs_1.5.2            promises_1.2.0.1    xml2_1.3.3         
[55] bslib_0.4.1         ellipsis_0.3.2      generics_0.1.3     
[58] vctrs_0.6.4         tools_4.2.2         glue_1.6.2         
[61] RNetCDF_2.6-1       hms_1.1.2           fastmap_1.1.0      
[64] yaml_2.3.6          colorspace_2.0-3    gargle_1.2.1       
[67] rvest_1.0.3         knitr_1.41          haven_2.5.1        
[70] sass_0.4.4