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Palestrante: Christian Kummerow - Colorado State University
Remote Sensing of Precipitation – from Physics to Products
Satellite precipitation retrievals are fundamentally under-constrained, requiring either implicit or explicit a-priori information to constrain the solutions. The launch of the TRMM mission in 1997, with its first space borne radar, allowed for more physically based, yet still under constrained solutions that incorporated both radar and passive microwave information. The single frequency radar, however, still required significant assumptions about the potential drop size distribution as well as cloud inhomogeneities below the 4 km resolution of the radar.
These developments paved the way for the Global Precipitation Mission that was launched in February of 2014. Its core satellite carries a dual frequency radar and state of the art microwave radiometer that constrains the precipitating systems even further. It also serves as a complete database of a-priori cloud structures that can be used within a Bayesian framework to provide a unified, 3 hourly rainfall product from a constellation of available satellites carrying passive microwave sensors. The validation of these products, however still reveals significant differences between regions that can only be attributed to the physics of the precipitation. Understanding the physics, and producing better products, thus become inextricably linked.
Seminário: Remote Sensing of Precipitation – from Physics to Products elton john | |
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| Science & Technology | Upload TimePublished on 1 Jun 2018 |
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