CLPX-Ground: Ground-Based Frequency Modulated Continuous Wave (FMCW) RadarEntry ID: NSIDC-0164
Abstract: This data set is comprised of FMCW radar measurements, which are sensitive to electromagnetic discontinuities in the snowpack, made during the 2002 and 2003 Cold Land Processes Field Experiment (CLPX). The microwave interaction with a snow pack was measured using broadband frequency modulated continuous wave (FMCW) radar operating at between 2 and 18 GHz, incorporating the following frequencies: ... C-Band (2-6 GHz), X-Band (8-12 GHz), and Ku-Band (14-18 GHz). Measurements were made at the Local Scale Observation Site (LSOS) near Fraser, Colorado, during Intensive Observation Periods (IOP) 1 and 2 (February and March, 2002), and at four different sites covering each of the three Mesocell Study Areas (MSAs) during IOP 3 and 4 (February and March, 2003). Active microwave radar signals are reflected and scattered by electromagnetic discontinuities that affect radar backscatter signatures. The location and magnitude of these discontinuities in a snow pack must be identified as a function of microwave frequency in order to accurately invert snow cover properties from active and passive microwave remote sensing systems. Consequently, in conjunction with the radar measurements, detailed snow pit measurements were taken at a nearby site in order to correlate the radar profile with the snow pit records. This investigation found that radar operating at 14-18 GHz contains the most information about the internal features of a dry snow pack. However, the high-frequency radar is of limited use in wet snow due to the high absorption loss in water. For a wet snowpack, radar operating at lower frequencies (2-6 GHz) was necessary for penetrating to the snow-ground interface. These findings suggest that a dual-frequency approach for radar remote sensing may be necessary to retrieve snow pack parameters such as density, depth, and wetness. The NASA CLPX is a multi-sensor, multi-scale experiment that focuses on extending a local-scale understanding of wa
ter fluxes, storage, and transformations to regional and global scale
s. Within a framework of nested study areas in the central Rocky Mountains of the western United States, ranging from 1-ha to 160,000 km2, intensive ground, airborne, and spaceborne observations are collected. Data collection focuses on two seasons: mid-winter, when conditions are generally frozen and dry, and early spring, a transitional period when both frozen and thawed, dry and wet conditions are widespread.
Data Set Citation
Dataset Originator/Creator: Hans-Peter Marshall
Dataset Title: CLPX-Ground: Ground-Based Frequency Modulated Continuous Wave (FMCW) Radar
Dataset Release Date: 2004-11-22
Dataset Release Place: Boulder, CO
Dataset Publisher: National Snow and Ice Data Center (NSIDC)Online Resource: http://nsidc.org/data/nsidc-0164.html
Start Date: 2002-02-19Stop Date: 2002-03-26
Start Date: 2003-02-19Stop Date: 2003-03-29
ISO Topic Category
Data Set Progress
Distribution Media: FTP
Distribution Size: 17 KB to 11.2 MB
Distribution Format: Binary and comma-delimited ASCII. Images of radar scans in JPEG.
Campus Box 450
Province or State: CO
Postal Code: 80309-0422
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
National Snow and Ice Data Center CIRES, 449 UCB University of Colorado
Province or State: CO
Postal Code: 80309-0449
Koh, G. and R. Jordan. 1995. Subsurface melting in a seasonal snow cover. J.GLAC, 41(139):474-482.
Koh, G., N.D. Mulherin, J.P. Hardy, R.E. Davis, and A. Twombly. 2002. Microwave Interaction with Snowpack Observed at the Cold Land Processes Field Experiment. 59th Eastern Snow Conference, Stowe, Vermont, USA 2002.
Koh, G. N.E. Yankielun and A.I. Baptista. 1996. Snow ... cover characterization using multiband FMCW radars. Hydr. Proc., 10(12):1609-1617.
Marshall, H.P., G. Koh, and R. Forster. Ground-Based FMCW radar measurements: a summary of the NASA CLPX data. EOS Trans, AGU, 84(46), Fall Meet. Suppl., Abstract C42B-07.
Marshall , H.P., G. Koh, and R. Forster, in press. Estimating Alpine Snowpack Properties Using FMCW Radar. Annals of Glaciology, vol. 40.
Marshall , H.P., G. Koh, and R. Forster, in press. Ground-based FMCW radar measurements in wet and dry snowpacks, Colorado , U.S.A. Â An analysis and summary of the 2002-03 NASA CLPX data. Hydrologic Processes.
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2004-11-22
Last DIF Revision Date: 2010-03-04