Using collocations to study and improve IWP retrievals

CIRA Director's Conference Room
Wednesday, May 15, 2013 - 16:00
Lulea University of Technology, Sweden
Gerrit Holl
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Satellite-based retrievals are essential for understanding and monitoring climate. A direct combination of measurements from different satellites through collocations allows for a variety of applications. For similar sensors, we can perform intercalibrations. For sensors based on different techniques, we can learn about different instrument capabilities, we can create new retrievals, and more. In this seminar, I will talk about a software toolkit for the easy collocation of arbitrary pairs of satellite sensors, about the product 2D-CLOUDSAT-POES created with it, and how this can be applied for improving our understanding of Ice Water Path. Ice Water Path (IWP) is an Essential Climate Variable (ECV) according to the World Meteorological Organization (WMO), but climate models vary widely in their estimates. One of the reasons is that the climate models are poorly constrained by IWP retrievals. Different satellite sensors have different capabilities for retrieving IWP, but even estimates from sensors with the same capability vary significantly for various reasons, such as microphysical assumptions. Using data from the collocation toolkit and 2D-CLOUDSAT-POES, I will describe how different satellite-based IWP retrievals compare and how we can use collocations to improve existing retrievals.