CoastalLight-package: CoastalLight: Available Light on the Coastal Ocean [0-200m]...

In jpgattuso/CoastalLight: Available Light on the Coastal Ocean [0-200m] Floor

Description

Satellite data collected between 1998 and 2018 (SeaWiFS, MODIS, MERIS, VIIRS), in conjonction with GEBCO gridded bathymetric data (15 arc seconds), are used to estimate, at a nearly global scale, the irradiance reaching the bottom of the coastal ocean.

Details

This package has two goals :

1. calculate the surface area of the sea floor which receives more than a given threshold of irradiance.

2. get various geographic and optical data from a database consisting of files to download

Goal 1

:

1. function cl_surface() is the main function; it returns the surface areas receiving irradiance above given thresholds, or the P-functions (see Gattuso et al. - reference below) for three standard regions; NonPolar, Arctic, and Antarctic; It is the only function to use if you are interested in one of these standard regions; P-functions for these regions have been tabulated and the tables included in the package.

2. function cl_subregion() is used to produce the P-functions of a subregion of one of the three standard regions; it connects to a server that does the calculations and offers to download a file containing the P-functions for this subregion; this file is ready to be used by the function cl_surface().

Goal 2

:

1. function cl_DownloadData() downloads the data;

2. function cl_GetData() gets the data on a geographic zone defined by the user;

3. function cl_PlotData() plots the data, as returned by function cl_GetData().

4. function cl_Transect() complements function cl_GetData() for the extraction of data along a transect.

Data and units :

• P-functions : %

• longitude : decimal \, degree \; [-180 ; 180]

• latitude : decimal \, degree \; [-90 ; 90]

• depth : m

• area : km^{2}

• par, parbottom : mol.photons \; m^{-2} \; d^{-1}

• kdpar : m^{-1}

References

Gattuso J.-P., Gentili B., Antoine D. & Doxaran D., 2020. Global distribution of photosynthetically available radiation on the seafloor. Earth System Science Data 12:1697-1709. http://dx.doi.org/10.5194/essd-12-1697-2020

See Also

Useful links:

• https://doi.pangaea.de/10.1594/PANGAEA.910898

• http://obs-vlfr.fr/Pfunction/

• https://obs-vlfr.fr

jpgattuso/CoastalLight documentation built on June 25, 2021, 5:34 p.m.