Has Rajopadhyaya reached in NASA?

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http://adsabs.harvard.edu/abs/2006AGUSM.H23C..10N

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Vertical Characteristics of Snow in the Northern Plains

Newman, A.; Kucera, P.; Williams, C.; Bliven, L.

American Geophysical Union, Fall Meeting 2007, abstract #H23C-10

With the upcoming Global Precipitation Measurement (GPM) mission, there is a need to improve retrievals of snowfall from microwave instruments to estimate the total precipitation budget in high latitude environments. Information about the hydrometeor size, shape, and bulk density can be used to improve these estimates by modeling the brightness temperature based on retrieved hydrometeor information. Currently, high resolution measurements of surface size/shape distributions of snowfall are limited because they are highly event dependent and intermittent through time. The University of North Dakota, in conjunction with the NOAA Earth System Research Laboratory (formally NOAA Aeronomy Lab) has operated a 915 MHz vertical wind profiler at the Glacial Ridge Nature Conservancy located in Northwest Minnesota for the past two winter seasons. A video disdrometer developed by Dr. Larry Bliven (NASA/GSFC) has also been operating during this time frame and will be used to retrieve snowflake crystal type, shapes and size distributions at the surface. This supplemental data can be helpful in retrieving vertical size distributions for snow using a profiler (at VHF frequency) as described in the study by Rajopadhyaya et al. (1994). Because the profiler at Glacial Ridge operates at UHF, we must use a different retrieval method than used in the study by Rajopadhyaya et al. (1994). The main reason is due to the lack of a clear air signal (e.g. Bragg scattering) in precipitation. Examination of possible retrieval techniques (e.g. Williams 2002) and results from initial retrieval attempts will be presented.

Keywords: 3360 Remote sensing, 3394 Instruments and techniques, 0736 Snow (1827, 1863), 3354 Precipitation (1854)

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