opc_biomass: Calculate OPC biomass

In hansenjohnson/opcr: Process and Plot Data from an Optical Plankton Counter (OPC)

Calculate OPC biomass

Description

Convert Equivalent Spherical Diameter (ESD) from the OPC into wet weight (in mg) per depth bin using the formula below which was developed by Suthers et al (2006) and implemented by Fortune et al (2020).

Usage

opc_biomass(
  df,
  dz = 2,
  min_size = 1,
  max_size = 6,
  good_only = TRUE,
  reject_volume = TRUE
)

Arguments

df	opc tibble
dz	depth bin width (meters)
min_size	minimum particle ESD (mm; default = 1)
max_size	maximum particle ESD (mm; default = 6)
good_only	use only good (unflagged) values
reject_volume	set concentration to NA for depth bins with <50% volume sampled

Details

wet_weight = 4/3 * pi * (esd/2)^3 * rho where rho = 1 mg / mm

Note that this is only applied to particles > 1 mm ESD

Value

tibble

hansenjohnson/opcr documentation built on Jan. 24, 2023, 5:04 a.m.