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Brief description
The Aqua satellite platform carries a MODIS sensor that observes sunlight reflected from within the ocean surface layer at multiple wavelengths. These multi-spectral measurements are used to infer the concentration of chlorophyll-a (Chl-a), most typically due to phytoplankton, present in the water. An empirical relationship is then used to compute an estimate of the relative abundance of three phytoplankton size classes (micro, nano and picoplankton).The methods used to decompose chl_oc3 are described by Brewin et al in two papers in 2010 and 2012. The two methods, denoted Brewin2010at and Brewin2012in, used calibration data from the Atlantic and Indian Oceans respectively. Users should note that these are unvalidated experimental products and they should familiarise themselves with the underlying algorithms and methodologies described in the published literature before making use of them.
The data are produced from the same data stream as the MODIS Chla_oc3 data set (https://catalogue-imos.aodn.org.au:443/geonetwork/srv/api/records/d7a14921-8f3f-4522-9a54-e7d1df969c8a).
Data are provided as two files per day, one with the percentage of nanoplankton, and one for picoplankton. The percentage of microplankton is computed as the balance to 100%, that is %micro = 100 - %nano - %pico.
Lineage
Statement: The radiometric sensitivity of the MODIS sensor is evolving continuously during its mission and is monitored regularly by NASA. The SeaDAS software uses tables of calibration coefficients that are updated periodically. From time to time upgrades to the algorithms and/or the format of the calibration tables are required, in which case a new version of SeaDAS is released. These data were updated on 1 September 2020 to use processing in SeaDAS v7.5 and between 2002/07/04 and 2022/06/30 are consistent with the R2018.0 reprocessing (https://oceancolor.gsfc.nasa.gov/reprocessing/r2018/aqua/). Data between 2022/07/01-2023/01/31 and then from 2023/02/01 onwards, have been processed with two more recent releases of SeaDAS and are yet to be fully verified for consistency with NASA’s most recent processing(s). Once consistency has been established, the entire data set (from 2002/07/04) will be updated and this metadata record will be changed to reflect that. The data are produced by combining the near real time (nrt) data stream from all the available direct broadcast reception stations in Australia with delayed-mode data from NASA in the US. The data have been remapped from satellite projection into a geographic (Latitude/Longitude axes) projection (0.01 degree sampling) and are presented as a sequence of daily mosaics covering the region (80 <= Longitude <= 180, -60 <= Latitude <= +10) formatted as CF-compliant netCDF files. It should be noted that the data are not processed until the definitive spacecraft ephemeris becomes available, usually 12-24 hours after the overpass. This means that the geolocation should be of a uniformly high standard. The filenames are of the form A.P1D.Notes
CreditAustralia’s Integrated Marine Observing System (IMOS) is enabled by the National Collaborative Research Infrastructure Strategy (NCRIS). It is operated by a consortium of institutions as an unincorporated joint venture, with the University of Tasmania as Lead Agent.
Credit
CSIRO Oceans and Atmosphere
CSIRO Oceans and Atmosphere
Credit
Curtin University
Curtin University
Created: 04 11 2014
Data time period: 04 07 2002
text: westlimit=80; southlimit=-60.00; eastlimit=179.9; northlimit=10.00
Subjects
Aqua |
Chlorophyll |
Concentration of inferred chlorophyll from relative fluorescence per unit volume of the water body |
Countries | Australia |
Countries | Fiji |
Countries | Indonesia |
Countries | Malaysia |
Countries | New Caledonia |
Countries | New Zealand |
Countries | Papua New Guinea |
Countries | Philippines |
Countries | Singapore |
Countries | Thailand |
Countries | Timor-Leste |
Countries | Vanuatu |
Countries | Vietnam |
EARTH SCIENCE |
Global / Oceans | Indian Ocean |
Global / Oceans | Pacific Ocean |
Global / Oceans | Southern Ocean |
Marine Features (Australia) | Bass Strait, TAS/VIC |
Marine Features (Australia) | Great Australian Bight, SA/WA |
Marine Features | Strait of Malacca |
OCEAN CHEMISTRY |
Ocean Color |
OCEAN OPTICS |
OCEANS |
Ocean Colour Sub-Facility, Integrated Marine Observing System (IMOS) |
Regional Seas | Andaman Sea |
Regional Seas | Arafura Sea |
Regional Seas | Banda Sea |
Regional Seas | Celebes Sea |
Regional Seas | Coral Sea |
Regional Seas | Gulf of Thailand |
Regional Seas | Java Sea |
Regional Seas | Philippine Sea |
Regional Seas | Solomon Sea |
Regional Seas | South China Sea |
Regional Seas | Tasman Sea |
Regional Seas | Timor Sea |
States, Territories (Australia) | New South Wales |
States, Territories (Australia) | Northern Territory |
States, Territories (Australia) | Queensland |
States, Territories (Australia) | South Australia |
States, Territories (Australia) | Tasmania |
States, Territories (Australia) | Victoria |
States, Territories (Australia) | Western Australia |
ocean colour radiometers |
oceans |
User Contributed Tags
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Other Information
(Satellite Remote Sensing page on IMOS website)
uri :
http://imos.org.au/srs.html
SRS - OC3 - Nanoplankton 2012 - WMS layer (srs_oc_aqua_nanop_brewin2012in_url/nanop_brewin2012in)
uri :
http://geoserver-123.aodn.org.au/geoserver/ncwms
(GoGoDuck help documentation)
uri :
https://help.aodn.org.au/web-services/gogoduck-aggregator/
(ncUrlList help documentation)
uri :
https://help.aodn.org.au/web-services/ncurllist-service/
Identifiers
- global : 9fde091c-9d38-4b2f-ba23-c262c21a41a2
