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Reconciling CloudSat and GPM Estimates of Falling Snow
NTRS Full-Text: Click to View  [PDF Size: 2.2 MB]
Author and Affiliation:
Munchak, S. Joseph(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Jackson, Gail Skofronick(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Kulie, Mark(Michigan Technological Univ., Houghton, MI, United States)
Wood, Norm(Wisconsin-Madison Univ., Madison, WI, United States)
Miliani, Lisa(Michigan Technological Univ., Houghton, MI, United States)
Abstract: Satellite-based estimates of falling snow have been provided by CloudSat (launched in 2006) and the Global Precipitation Measurement (GPM) core satellite (launched in 2014). The CloudSat estimates are derived from W-band radar measurements whereas the GPM estimates are derived from its scanning Ku- and Ka-band Dual-Frequency Precipitation Radar (DPR) and 13-channel microwave imager (GMI). Each platform has advantages and disadvantages: CloudSat has higher resolution (approximately 1.5 km) and much better sensitivity (-28 dBZ), but poorer sampling (nadir-only and daytime-only since 2011) and the reflectivity-snowfall (Z-S) relationship is poorly constrained with single-frequency measurements. Meanwhile, DPR suffers from relatively poor resolution (5 km) and sensitivity (approximately 13 dBZ), but has cross-track scanning capability to cover a 245-km swath. Additionally, where Ku and Ka measurements are available, the conversion of reflectivity to snowfall rate is better-constrained than with a single frequency.
Publication Date: Dec 11, 2017
Document ID:
20180000531
(Acquired Feb 13, 2018)
Subject Category: METEOROLOGY AND CLIMATOLOGY
Report/Patent Number: GSFC-E-DAA-TN50902
Document Type: Oral/Visual Presentation
Meeting Information: AGU Fall Meeting; 11-15 Dec. 2017; New Orleans, LA; United States
Meeting Sponsor: American Geophysical Union; Washington, DC, United States
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Description: 16p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Use by or on behalf of the U.S. Government permitted
NASA Terms: CLOUDSAT; PRECIPITATION (METEOROLOGY); PRECIPITATION MEASUREMENT; ESTIMATES; SNOW; MULTISPECTRAL RADAR; SENSITIVITY; RADAR MEASUREMENT; FREQUENCIES; REFLECTANCE
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