OLYMPEX Airborne Data Analysis for Snowfall Rate-Reflectivity Relationships
Utilizing Citation aircraft data from OLYMPEX, this study focuses on developing relationships between snowfall (rainfall) rate and radar reflectivity across various radar bands. Comparisons are made between in-situ aircraft data and retrieval products from CloudSat, GPM, and TRMM datasets. Results indicate the potential of OLYMPEX airborne observations for enhancing spaceborne radar retrieval algorithms, particularly in understanding snowfall rates. Forward modeling challenges and evaluations are ongoing to further validate the findings.
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OLYMPEX Airborne Data Applied to Development of Snowfall Rate- Reflectivity Relationships Andrew Heymsfield and Aaron Bansemer, NCAR Contributors: Mike Poellot, Simone Tanelli, Guosheng Liu, Chuntao Liu, Norm Wood
Objectives Using Citation aircraft data from OLYMPEX, develop relationships between snowfall (rainfall) rate and radar reflectivity that apply to W, Ka and Ku bands Relate APR3 W, Ka and Ku band reflectivities to snowfall (rainfall) rates derived from in-situ aircraft data for times when the ER-2 and Citation aircraft are within 2 km of each other Compare these relationships to developed from retrieval products from CloudSat, GPM TRMM processed data sets. Discuss preliminary results from the forward-modeling challenge project.
Evaluate Forward Calculated Radar Reflectivity for Rain No assumption about particle mass Non-Rayleigh effects relatively small # 1-sec collocations: 4807
# 1-sec collocations= 13377
Rainfall Rates, derived for P=1000 hPa
Snowfall rates Derived for P=1000 hPa
GCPEX Forward Model Evaluation APR2-Citation Collocations Sent Investigators PSDs, they forward- Modeled Ze
Summary and Conclusions OLYMPEX airborne observations are a rich source of data for developing and evaluating spaceborne radar retrieval algorithms Snowfall rates from retrievals are low relative to those developed here Will now send out OLYMPEX data to investigators to do an evaluation of their forward models I will discuss representativeness of OLYMPEX observations tomorrow
