|Paper title||MW / IR intercomparison campaign for the establishment of a SST skin-subskin relation|
|Form of presentation||Poster|
Temperature rise and the immediate effect it has in the Arctic calls for increased monitoring of sea surface temperature (SST), which demands the highest possible synergy between the different sensors orbiting Earth, both on present and future missions. One example is the possible synergy between Sentinel-3’s SLSTR and the future Copernicus expansion satellite: Copernicus Imaging Microwave Radiometer (CIMR), which is currently in development phase. To achieve consistency between the observations from the different missions, there is a need to establish a relation between skin and subskin SSTs, which are measured by infrared and microwave sensors respectively. That will lead to the creation of more homogeneous and higher accuracy datasets that could be used to monitor climate change in greater detail and to be assimilated into climate models.
To address the aforementioned issue, the Danish Meteorological Institute (DMI) and the Technical University of Denmark (DTU) performed, on June 2021, a week-long intercomparison campaign between Denmark and Iceland, where they collected data by simultaneously deploying a microwave and an infrared radiometer side-by-side. The work was a part of the ESA funded project SHIPS4SST (ships4sst.org) and the International Sea Surface Temperature Fiducial Reference Measurement Radiometer Network (ISFRN) where shipborne IR radiometer deployments have been conducted between Denmark and Iceland for several years. In this particular campaign, two ISARs (Infrared Sea Surface Temperature Autonomous Radiometer), measuring on the 9.6 – 11.5 μm spectral band, were deployed alongside two recently refurbished EMIRADs, namely EMIRAD-C and EMIRAD-X, measuring on C and X band respectively.
This study aims at demonstrating the methodology applied within ESA CCI SST to retrieve SST from the microwave brightness temperature, and present a first attempt to establish a relationship between skin and subskin SST, as well as the overall research progress so far.