ze_from_surface_chla: Compute the lower limit of the euphotic zone from surface...

In jiho/castr: Process CTD casts

Description

Compute the lower limit of the euphotic zone from surface chlorophyll content

Usage

ze_from_surface_chla(chla)

Arguments

chla	value(s) of chlorophyll concentration at the surface, in mg m-3, typically measured from satellite.

Details

The lower limit of the euphotic zone (Ze) is normally computed from a profile of downwelling PAR irradiance (see ze_from_par()). Here, it is estimated using the procedure of Lavigne et al (2012): (1) use [Chl a] to estimate Kd490, the attenuation coefficient at 490 nm (Morel and Maritorena, 2001), (2) use Kd490 to estimate KdPAR (Rochford et al, 2001), (3) use KdPAR to estimate Ze assuming an exponential decrease of light with depth.

Value

The estimated depth of the lower limit of the euphotic zone.

References

Morel and Maritorena (2001). Bio‐optical properties of oceanic waters: A reappraisal. Journal of Geophysical Research: Oceans, 106(C4), 7163-7180.

Rochford et al (2001). Importance of solar subsurface heating in ocean general circulation models. Journal of Geophysical Research: Oceans, 106(C12), 30923-30938.

Lavigne et al (2012). Towards a merged satellite and in situ fluorescence ocean chlorophyll product. Biogeosciences, 9, 2111–2125.

See Also

Other functions computing remarkable depths: clined, maxd, mld, ze_from_chla, ze_from_par

Examples

ze_from_surface_chla(0.01)
ze_from_surface_chla(0.1)
ze_from_surface_chla(1)

jiho/castr documentation built on April 5, 2020, 2:12 p.m.