gpm planning mtg aug 2001skofronick-jackson, weinman, wang, chang high frequency microwave...
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Skofronick-Jackson, Weinman, Wang, ChangGPM Planning Mtg Aug 2001
High Frequency Microwave Observations of Frozen
HydrometeorsGail Skofronick Jackson
University of Maryland, Baltimore County,
Goddard Earth Science and Technology Center
Goddard, Code 975, [email protected]
James A. Weinman, James R. WangNASA Goddard Space Flight Center, Code 975
Dong-Eon ChangCenter for Earth Observing and Space Research
George Mason University
Fairfax, VA
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GPM Planning Mtg Aug 2001 Skofronick-Jackson, Weinman, Wang, Chang
Challenges of GPM
• Measure extratropical precipitation, much of which is light rain and snow.This is especially critical to support land hydrology.
• Improve sampling of all types of precipitation, including snow.
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GPM Planning Mtg Aug 2001 Skofronick-Jackson, Weinman, Wang, Chang
Motivation• What information regarding frozen
hydrometeors and snowfall in the atmosphere can be obtained from high frequency microwave measurements?
• Improve understanding of hydrometeor-radiometer-radar relationships
• Heritage: Early work by A. T. C. Chang and J. R. Wang, (1992) using the Airborne Advanced Microwave Moisture Sounder (AMMS).
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GPM Planning Mtg Aug 2001 Skofronick-Jackson, Weinman, Wang, Chang
Snowfall Obs. Over LandNew England experienced a significant blizzard on 3/6/01. The
85.5 GHz PCT responds mainly to snow on the ground that extends over Canada whereas the low 183+7 AMSU-B brightness
temperatures coincide with reported snowfall at the time.
SSM/I 85 GHz AMSU-B 183±7 GHz
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GPM Planning Mtg Aug 2001 Skofronick-Jackson, Weinman, Wang, Chang
Not Just A Surface Feature(Left) repeat of 183+7 GHz AMSU-B data at 2301UTC on 3/5/01 and (Right) data from the same sensor at 1302 UTC on 3/6/0.
Note that the low brightness temperatures (snowfall?) have moved eastward off shore.
14 Hours later AMSU-B 183±7 GHz
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GPM Planning Mtg Aug 2001 Skofronick-Jackson, Weinman, Wang, Chang
Not Just a Surface Feature:WSI Radar Mosaic
Note reduction of snowfall over VT.
05 March 2001 2300 06 March 2001 1300
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GPM Planning Mtg Aug 2001 Skofronick-Jackson, Weinman, Wang, Chang
MM5 Precipitation Distribution vs AMSU-B
AMSU-B 183±7 GHz MM5 Precipitation
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GPM Planning Mtg Aug 2001 Skofronick-Jackson, Weinman, Wang, Chang
Content and Weighting Fcns from MM5 Model of 3/6/01 Blizzard
1) Unlike the cloud-free case, these weighting functions are themselves function of the cloud distribution
2) Note order of magnitude increase in weighting function at high frequencies
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GPM Planning Mtg Aug 2001 Skofronick-Jackson, Weinman, Wang, Chang
Height Slicing using Water Vapor Absorption
Note the absence of low brightness temperature concentrations over New England (left) and their presence (right).
• 183 + 1 GHz AMSU-B • 183 + 3 GHz AMSU-B
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GPM Planning Mtg Aug 2001 Skofronick-Jackson, Weinman, Wang, Chang
CAMEX-3 Observations
EDOP(ER-2 Doppler Radar)
MIR(Millimeter-wave Imaging Radiometer)89 - 340 GHz
AMPR(Advanced Microwave Precipitation Radiometer)10 – 85 GHz
Qualitative Profile
Retrievals
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GPM Planning Mtg Aug 2001 Skofronick-Jackson, Weinman, Wang, Chang
Microwave Weighting Functions for a Cirrus Anvil Case
Note that unlike the cloud-free case, these weighting functions are themselves a function of the cloud distribution
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GPM Planning Mtg Aug 2001 Skofronick-Jackson, Weinman, Wang, Chang
Retrieval Results for Two Anvil Profiles using Selected Channel Sets
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GPM Planning Mtg Aug 2001 Skofronick-Jackson, Weinman, Wang, Chang
Conclusions/Summary
• HF microwave channels reveal ice and snow features missed at TMI frequencies.
• Snowfall appears observable from HF where water vapor absorption obscures the ground and may reveal ice profiles.