Validation focusing on high latitudes (OCAWI)


Contact
Astrid.Bracher [ at ] awi.de

Abstract

Our team has expertise in ocean optics in situ measurements and the development of algorithms to derive phytoplankton characteristics from satellite ocean colour. Since 2007 we participated in 13 Atlantic and Pacific cruises to acquire bio-optical in-situ measurements. These data are used to extract information on phytoplankton composition (Taylor et al. 2011, Zindler et al. 2012, Taylor et al. 2013), but also for validation and parameterization of radiative transfer models and satellite retrievals (Sadeghi et al. 2012). Particularly, we have specialized on evaluating specifically ocean colour algorithms in the polar oceans (Cherkasheva et al. 2013, Cherkasheva et al. revised at JMS, Soppa et al. 2013). For the Sentinel-3 validation campaign our objective is to validate ocean color level-2 products of OLCI with in-situ measurements. We want to validate chlorophyll conc., water leaving radiances or remote sensing reflectances, Kd490, absorption coefficients (phytoplankton, CDOM), POC conc. and PAR with data from the below stated in-situ measurements obtained during various campaigns. Most of our validation campaigns within early operation of Sentinel-3 OLCI will focus on the high latitudes (at 60°N->80°N and 45° to 70°S; funding secured for three RV POLARSTERN cruises in 2015-2016), but we will also sample at a coastal site at the Costa Brava, Alfacs Bay, Spain (with a local boat and from a raft) and in the Peruvian upwelling (with RV SONNE-II Jul-Aug 2015). Specifically the following parameters will be measured either continuously throughout the campaigns or at specific stations only at surface or in the whole profile: Apparent optical properties from radiometers (TRIOS RAMSES) deployed above and in-water; inherent optical properties from absorption (determined for CDOM, particulate, phytoplankton, total separately) measurements from water samples at stations and continuous attenuation and total absorption measurements during a transect at the surface and at stations in the profile or with TRIOS VIPER or ACS (WET labs); phytoplankton pigment conc. determined with HPLC and particulate organic carbon conc. with C/N Analyzer determined at water samples as mentioned above. In the presentation we will give an overview of our previous ocean colour validation work and give an overview on the planned validation campaigns for OLCI. We will also present the PANGAEA data base where so far all our published in situ data were uploaded.



Item Type
Conference (Talk)
Authors
Divisions
Primary Division
Programs
Primary Topic
Research Networks
Peer revision
Not peer-reviewed
Publication Status
Published
Event Details
Sentinel 3 Validation Team 1st Meeting, 26 Nov 2013 - 29 Nov 2013, ESA-ESRIN, Frascati.
Eprint ID
34835
Cite as
Bracher, A. (2013): Validation focusing on high latitudes (OCAWI) , Sentinel 3 Validation Team 1st Meeting, ESA-ESRIN, Frascati, 26 November 2013 - 29 November 2013 .


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