OceanChlorophyll: OCx maximum band-ratio chlorophyll.
VgpmProduction: Behrenfeld-Falkowski net primary production.
EuphoticDepth: 1 percent light depth from K_d or a Secchi depth.
Co2Flux: bulk air-sea CO2 flux (Wanninkhof 2014, Weiss 1974).
OxygenSolubility: Garcia-Gordon oxygen solubility.
PracticalSalinity: PSS-78 practical salinity.
SplitWindowSst: NLSST split-window temperature.
SedimentTransport: Shields number, critical Shields number and
Meyer-Peter-Mueller bedload. OilSpillDrift: Lagrangian drift with
Philox diffusion. PlumeConcentration: continuous point-source
plume. DepthInvariantIndex: Lyzenga bottom index.
FloatingAlgaeIndex, MangroveVegetationIndex,
BareSoilIndex: spectral indices. Identical to the Python arm
morie.fn.marine.
Usage
OceanChlorophyll(blue, green, algorithm = "OC4", coefficients = NULL)
EuphoticDepth(kd = NULL, secchi = NULL, fraction = 0.01)
VgpmProduction(chl, par, sst, day_length)
Co2Flux(u10, sst, sss, pco2_water, pco2_air, k0_units = "mol/L")
OxygenSolubility(temperature, salinity, units = "umol/kg")
PracticalSalinity(conductivity, temperature, pressure = 0)
SplitWindowSst(t11, t12, coefficients, sst_first_guess = NULL, zenith = 0)
SedimentTransport(tau, d, rho_s = 2650, rho = 1025, nu = 1.36e-06, g = 9.81)
OilSpillDrift(
x0,
y0,
current,
wind,
hours,
dt = 1,
n_particles = 100,
wind_factor = 0.03,
diffusivity = 10,
seed = 0
)
PlumeConcentration(x, y, load, u, depth, ky, decay = 0)
DepthInvariantIndex(band_i, band_j, deep_i, deep_j, sand_i, sand_j)
FloatingAlgaeIndex(red, nir, swir, wavelengths = c(645, 859, 1240))
MangroveVegetationIndex(green, nir, swir1)
BareSoilIndex(blue, red, nir, swir)Arguments
- blue
Blue reflectance(s): vector, or matrix with one row per pixel.
- green
Green reflectance.
- algorithm
"OC4","OC4v4","OC3M"or"OC2".- coefficients
Polynomial or split-window coefficients.
- kd
Diffuse attenuation coefficient (1/m).
- secchi
Secchi depth (m).
- fraction
Light fraction at the euphotic depth.
- chl
Chlorophyll (mg per cubic m).
- par
Daily PAR (mol photons per square m per day).
- sst
Sea-surface temperature (C).
- day_length
Day length (h).
- u10
Wind speed at 10 m (m/s).
- sss
Salinity.
- pco2_water, pco2_air
pCO2 (microatm).
- k0_units
"mol/L"or"mol/kg".- temperature
Temperature (C).
- salinity
Practical salinity.
- units
"umol/kg"or"ml/l".- conductivity
Conductivity (mS/cm).
- pressure
Sea pressure (dbar).
- t11, t12
Brightness temperatures.
- sst_first_guess
First-guess temperature (NULL uses t11).
- zenith
Satellite zenith angle (degrees).
- tau
Bed shear stress (Pa).
- d
Grain diameter (m).
- rho_s, rho
Sediment and water densities.
- nu
Kinematic viscosity.
- g
Gravity.
- x0, y0
Release position (m).
- current, wind
Constant (u, v) velocities (m/s).
- hours
Duration (h).
- dt
Time step (h).
- n_particles
Number of particles.
- wind_factor
Wind drift fraction.
- diffusivity
Horizontal diffusivity (square m per s).
- seed
Philox seed.
- x, y
Receptor coordinates (m).
- load
Discharge (mass per s).
- u
Current speed.
- depth
Water depth.
- ky
Transverse diffusivity.
- decay
First-order decay rate.
- band_i, band_j
Band radiances or reflectances.
- deep_i, deep_j
Deep-water signals.
- sand_i, sand_j
Sand pixels at varying depth.
- red, nir, swir, swir1
Reflectances.
- wavelengths
Red, NIR and SWIR wavelengths (nm).
References
O'Reilly, J. E. et al. (1998). Ocean color chlorophyll algorithms for SeaWiFS. Journal of Geophysical Research 103, 24937-24953.
Behrenfeld, M. J. and Falkowski, P. G. (1997). Photosynthetic rates derived from satellite-based chlorophyll concentration. Limnology and Oceanography 42, 1-20.
Wanninkhof, R. (2014). Relationship between wind speed and gas exchange over the ocean revisited. Limnology and Oceanography: Methods 12, 351-362.
Garcia, H. E. and Gordon, L. I. (1992). Oxygen solubility in seawater: better fitting equations. Limnology and Oceanography 37, 1307-1312.
UNESCO (1983). Algorithms for computation of fundamental properties of seawater. UNESCO Technical Papers in Marine Science 44.
Lyzenga, D. R. (1981). Remote sensing of bottom reflectance and water attenuation parameters in shallow water using aircraft and Landsat data. International Journal of Remote Sensing 2, 71-82.
Hu, C. (2009). A novel ocean color index to detect floating algae in the global oceans. Remote Sensing of Environment 113, 2118-2129.