Tuesday, 24 January 2012
Evaluation of the Satellite Microwave Multi-Sensor Retrieval of near-Surface Humidity and Temperature Using SAMOS Observations and Implications on Satellite-Derived Heat and Gas Flux Products
Hall E (New Orleans Convention Center )
Satellite-derived products of heat and gas flux are impacted by errors in satellite retrievals of near surface parameters such as wind speed, specific humidity (Qa), air temperature (Ta). Recent improvements in satellite-derived retrievals of Ta and Qa using microwave imaging observations from SSM/I, microwave sounding observations from AMSU-A, and Reynolds daily mean sea surface temperatures observations are presented in this study. Evaluation and improvements to the Ta and Qa retrieval methods were made by incorporating new automated ship observations as a part of the Shipboard Automated Meteorological and Oceanographic System (SAMOS) initiative. These high quality ship observations provide greater diversification of the in situ data used to derive and validate the retrievals by including more observations in typically data poor regions such as the Southern Ocean. The end of the SSM/I era has also necessitates using SSMIS observations so that Ta and Qa retrievals can be extended to the present day. We will present preliminary results that adjust SSMIS observations to SSM/I frequencies and provide an assessment of the Ta and Qa retrievals using SSMIS. All retrievals of Ta and Qa have spatial resolution of 0.25 degree and provide almost daily coverage from 70N-70S. Utilization of these Ta and Qa products with the COARE heat flux and gas transfer models is presented. Implications these Ta and Qa products have on global estimates of latent and sensible heat flux and gas transfer velocity estimates for carbon dioxide will be discussed.
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