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Depth of the chlorophyll-a maximum of one CTD cast

Source: R/ctd_derived.R
ctd_chl_max.Rd

The depth of the maximum of a running median of the profile (default 5 m window), so a single spiking bin cannot be "the max" (CalCOFI/workflows#102). Use the bottle-fitted sensor estimate est_chlorophyll_a_sta_corr (Rasmus Swalethorp, 2026-09-09). The window is in samples of the 1 m bins (window_m bins, forced odd); on irregular spacing it is a window of that many samples. Flagged samples are dropped first. Where the median flattens the peak into a plateau, the plateau depth with the highest raw value wins (then the shallowest).

Usage

ctd_chl_max(depth, chl, qual = NA, window_m = 5)

Arguments

depth

depth (m), one cast.

chl

chlorophyll-a (mg m^-3).

qual

quality codes of chl (NA = good).

window_m

running-median window (1 m bins), default 5.

Value

one-row tibble: chl_max_depth_m, chl_max_value (the smoothed value there), n.

Examples

z <- 0:150
ctd_chl_max(z, 0.2 + 2 * exp(-((z - 40) / 10)^2))
#> # A tibble: 1 × 3
#>   chl_max_depth_m chl_max_value     n
#>             <dbl>         <dbl> <int>
#> 1              40          2.18   151