USE OF ENVISAT AATSR WITHIN THE GODAE HIGH RESOLUTION SST PILOT PROJECT (GHRSST-PP)

摘要

A new generation of integrated sea surface temperature (SST) data products are now being provided by the Global Ocean Data Assimilation Experiment (GODAE) High-resolution SST Pilot Project (GHRSST-PP). Over USD10M has been invested by the international community to implement a Regional/Global Task Sharing (R/GTS) international framework for the GHRSST-PP which is now delivering SST data products and services in real time. The primary aim of the GHRSST-PP is to develop and operate a distributed system that will deliver high-resolution (better than 10 km and ～ 6 hourly) global coverage SST data products operationally in near real time. SST data products are derived by combining complementary satellite and in situ observations in real time. There are obvious synergy benefits to such an approach but their practical realisation is complicated by characteristic differences that exist between measurements of SST obtained from subsurface situ sensors, satellite microwave radiometers and, infrared radiometer systems. Furthermore, diurnal variability of SST within a 24 hour period, manifest as both warm layer and cool skin deviations, introduces additional uncertainty for direct inter-comparison and the implementation of data merging strategies. A suite of on-line satellite SST diagnostic systems are available within the GHRSST-PP to consider these and other issues and a re-analysis project will deliver the first of a series of reanalysis time-series (ultimately covering the period 1983-present) in early 2007. All GHRSST-PP products are served to the international user community free of charge through a variety of data transport mechanisms and access points. This paper provides an overview of the GHRSST-PP structure, activities and data products. For a complete and up-to-date review of the GHRSST-PP see http://www.ghrsst-pp.org.