Resolve explicit oxygen-threshold zone boundaries — oxygen

Resolve an explicit oxygen-threshold zone and its observed boundaries without introducing a universal OMZ or ODZ threshold.

Usage

oxygen_boundary(
  x,
  threshold,
  threshold_unit = NULL,
  variable = NULL,
  support = c("local", "all")
)

Arguments

x: A direct source-profile <ocean_cube> with one eligible preserved CF oxygen concentration variable.
threshold: Required finite non-negative numeric scalar.
threshold_unit: Optional bounded oxygen unit from the source physical quantity family. NULL means the exact source unit.
variable: Optional exact eligible current oxygen variable name.
support: Connectivity policy. "local" breaks components at explicit gaps; "all" retains gapped evidence without an exact crossing.

Value

A base data.frame with one row per longitude, latitude, and time, describing the core-containing threshold component, boundary evidence, Provenance V1, and bounded QA.

Details

Oxygen identity comes only from supported preserved CF standard_name and compatible units. Point crossings may be exact or locally linearly interpolated inside contiguous brackets. Cell means and gapped brackets return bracket-only evidence. Open edges are not extrapolated; exact thickness is reported only for two exact or locally interpolated point boundaries.

Examples

if (FALSE) { # \dontrun{
oxygen_boundary(cube, 20, "umol kg-1")
} # }