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Article Dans Une Revue Journal of Geophysical Research Année : 2011

Evaluation of 'all weather' microwave-derived land surface temperatures with in situ CEOP measurements

Résumé

Land surface skin temperature T s plays a key role in mete- orological and climatological processes but the availability and the accuracy of T s measurements over land are still limited, especially under cloudy con- ditions. T s estimates from infrared satellite observations can only be derived under clear sky. Passive microwave measurements are much less affected by clouds and can provide T s regardless of the cloud conditions. A neural net- work inversion including first guess information has been previously devel- oped to retrieve T s , along with atmospheric water vapor, cloud liquid wa- ter, and surface emissivities over land from Special Sensor Microwave / Im- ager measurements [ Aires et al. , 2001], with a spatial resolution of 0.25 o 0.25 o , at least twice daily. In this study, T s estimates are evaluated through care- ful comparisons with in situ measurements in different environments over a full annual cycle. Under clear sky conditions, the quality of our microwave neural network retrieval is equivalent to the infrared International Satellite Cloud Clima- tology Project products, for most in situ stations, with errors 3K as com- pared to in situ measurements. The performance of the microwave algorithm is similar under clear and cloudy conditions, confirming the potential of the microwaves under clouds. The T s accuracy does not depend upon the sur- face emissivity, as the variability of this parameter is accounted for in the processing. Our microwave T s have been calculated for more than 15 years (1993-mid2008). These "all weather" T s are a very valuable complement to the IR-derived T s , for use in atmospheric and surface models.

Domaines

Océanographie
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Dates et versions

hal-00635362 , version 1 (27-05-2014)

Identifiants

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J. Catherinot, Christophe Prigent, R. Maurer, F. Papa, Chloé Jimenez, et al.. Evaluation of 'all weather' microwave-derived land surface temperatures with in situ CEOP measurements. Journal of Geophysical Research, 2011, 116, pp.D23105. ⟨10.1029/2011JD016439⟩. ⟨hal-00635362⟩
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