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We propose to extract altimeter data for each tropical storm data from QuikSCAT reprocessing and continuing through the OSTM cal/val phase. We will use the data to study air-sea interaction and to characterize hurricane effects that may be of use both scientifically and operationally. From the altimeter records we will use Ku and C band SWH and sigma0, skewness from retracking, and the radiometer measurements as well as atmospheric model fields. Where QuikSCAT data are collocated in time and space they will provide measurements of sigma0 as well as wind speed and direction. As appropriate, we will investigate effects in both scatterometer and altimeter measurements. Effects will be investigated both statistically and by case studies. The work will aim to derive operationally useful methods for improving storm forecasting and assessment. Topics to be investigated include: - air-sea interaction, particularly the altimeter's ability to measure spray/spume and the development of hurricanes; - the effect of wave height on scatterometer measurements; - rain effects. If additional data types such as SST, ocean heat content, other radiometer data, or model information have been collocated with the QuikSCAT data, we will use those in investigating some of these effects. Significance: - improved understanding of the measurement and effects of spray/spume in tropical storms; - improved understanding of changes in small scale surface roughness around tropical storms; - improved understanding of the effect of rain on both scatterometer data (a significant error source) and altimetry.

Project PI: Philip Callahan/Jet Propulsion Laboratory

Email: philip.s.callahan@jpl.nasa.gov

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Started: Aug 09, 2010

Last Activity: Dec 10, 2010

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