DATASET

GMIS - SeaWiFS Monthly anomalies sea surface Chlorophyll-a concentration (4km) in %

Collection: GMIS : Global Marine Information System 

Description

Monthly anomalies sea surface Chlorophyll-a concentration (in mg.m^-3 (log10) at 4km resolution) derived from the SeaWiFS sensor (Satellite remote sensing Ocean color data):

Chlorophyll is a photosynthetic pigment commonly present in all phytoplankton species. It is used as a proxy for phytoplankton biomass.

Chlorophyll concentration is a standard product from satellite-based optical sensors, usually retrieved from empirical algorithms using reflectance ratios at two or more wavebands.

Contact

Email
jrc-emis (at) ec.europa.eu

Contributors

  • Frederic Melin

How to cite

Melin, Frederic (2013): GMIS - SeaWiFS Monthly anomalies sea surface Chlorophyll-a concentration (4km) in %. European Commission, Joint Research Centre (JRC) [Dataset] PID: http://data.europa.eu/89h/dbb69114-cd76-45a7-ae84-592ef21a3ffe

Keywords

climate change marine monitoring coastal environment GIS digital format marine environment sea surface Chlorophyll-a concentration anomalies sea water protection ocean color satellite observations

Data access

GMIS - Download access (GMIS_S_ANO_CHLA)
URL 
  • Direct NetCDF download

Spatial coverage

Type Value
GML
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GEO
POLYGON((-180 90,180 90,180 -90,-180 -90,-180 90))
GEO
{"type":"Polygon","crs":{"type":"name","properties":{"name":"urn:ogc:def:crs:OGC:1.3:CRS84"}},"coordinates":[[[-180.0,90.0],[180.0,90.0],[180.0,-90.0],[-180.0,-90.0],[-180.0,90.0]]]}

Temporal coverage

From date To date
1997-09-01 2010-12-31

Lineage information

General information: Monthly anomalies sea surface Chlorophyll-a concentration in mg.m^-3 (log10 scalling) derived from the SeaWiFS sensor. Processing information: Chlorophyll-a data is processed using NASA SeaDAS 6.4 software and the standard OC3M algorithm for chla. Temporal characteristics: This product consists of standard Monthly anomalies sea surface chlorophyll-a concentrations (L3 product) at 9km resolution (projection: Equidistant cylindrical Grid mapping: equirectangular). Description of observation methods/instruments: The remote sensing of 'Ocean Color' represents a measure of the spectral variations in the light leaving the water surface, subsequently interpreted in terms of concentrations of optically-significant constituents in the water. After removing the atmospheric contribution, the water leaving radiance recorded at a given time and wavelength by the satellite reflects the optical properties of the water which, in turn, mirrors a specific structure and biogeochemical composition of the marine waters. Accordingly, the satellite-derived reflectance at the air-sea interface can be related to the concentration of an optically-significant constituent (e.g. chlorophyll). The retrieval of chlorophyll from SeaWiFS for case 1 waters (optically dominated by phytoplankton and associated products) uses a 4th order polynomial algorithm (O'Reilly et al. 2000). Quality/accuracy/calibration information: The 'standard' algorithm proposed by space agencies to process data from their sensors has a nominal accuracy of ~35% in the retrieval of surface chlorophyll in case 1 waters. References: J. E. O'Reilly and co-authors, SeaWiFS Postlaunch Calibration and Validation Analyses, Part 3. NASA Tech. Memo. 2000-206892, Vol. 11, S.B. Hooker and E.R. Firestone, Eds., NASA Goddard Space Flight Center, Greenbelt, Maryland, 9-23. Other contextual information: The product is stored in NetCDF data and available for download.

Additional information

Published by
European Commission, Joint Research Centre
Created date
2021-04-23
Modified date
2020-11-23
Issued date
2013-08-29
Landing page
http://gmis.jrc.ec.europa.eu/ 
Language(s)
English
Data theme(s)
Environment
Update frequency
unknown
Identifier
http://data.europa.eu/89h/dbb69114-cd76-45a7-ae84-592ef21a3ffe
Popularity