Thirty-year Arctic sea ice temperature record from FCDR SSM/I and SSMIS brightness temperature
Abstract
Satellite passive microwave (MW) measurements can provide pan-Arctic coverage of sea ice parameters even in presence of non-precipitating clouds. However, it is difficult to obtain sea ice emissivity or physical temperature from MW brightness temperatures because surface roughness and volume scatterings of snow and ice on sea ice MW emission hamper the use of Fresnel equation, causing a difficulty of solving the radiative transfer equation.
Recently, estimating ice surface and volume scatterings on the AMSR-E microwave sea ice apparent (or effective) emissivity, a correction factor (defined as effects of surface scattering plus volume scattering) was introduced to remove the scattering influence from the apparent emissivity. By relating AMSR-E correction factor to SSM/I PR and GR, regression-based correction factor algorithm is obtained to apply for SSMI data. Then MW radiative transfer equation on the sea ice can be solved in terms of sea ice emissivity as well as temperature from TB measurements only, without any a priori information. The results show that obtained sea ice emitting layer temperatures are in good agreement with snow/ice interface temperature form by Cold Region Research and Environmental Laboratory (CRREL) ice mass balance buoy measurements, with a correlation coefficient above 0.9 for December-January-February months. In this presentation, we will show results of sea ice apparent emissivity and temperature over the Arctic sea ice during past three decades.- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.C51D1084L
- Keywords:
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- 3360 Remote sensing;
- ATMOSPHERIC PROCESSESDE: 0758 Remote sensing;
- CRYOSPHEREDE: 1855 Remote sensing;
- HYDROLOGYDE: 4275 Remote sensing and electromagnetic processes;
- OCEANOGRAPHY: GENERAL