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Greenland Ice Sheet Melt Characteristics Derived from Passive Microwave Data
Entry ID: NSIDC-0218


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Summary
Abstract: The Greenland ice sheet melt extent data, acquired as part of the NASA Program for Arctic Regional Climate Assessment (PARCA), is a daily (or every other day, prior to August 1987) estimate of the spatial extent of wet snow on the Greenland ice sheet since 1979. It is derived from passive microwave satellite brightness temperature characteristics using the Cross-Polarized Gradient Ratio (XPGR) of Abdalati and Steffen (1997). It is physically based on the changes in microwave emission characteristics observable in data from the Scanning Multi-channel Microwave Radiometer (SMMR) and the Special Sensor Microwave/Imager (SSM/I) instruments when surface snow melts. It is not a direct measure of the snow wetness but rather is a binary indicator of the state of melt of each SMMR and SSM/I pixel on the ice sheet for each day of observation. It is, however, a useful proxy for the amount of melt that occurs on the Greenland ice sheet. The data are provided in a variety of formats including raw data in ASCII format, gridded daily data in binary format, and annual and complete time series climatologies in gridded binary and GeoTIFF format. All data are in a 60 x 109 pixel subset of the standard Northern Hemisphere polar stereographic grid with a 25 km resolution and are available via FTP.

Related URL
Link: GET DATA
Description: FTP site for obtaining these data.


Link: GET DATA > ECHO
Description: Refine your granule search with ECHO's next generation Earth Science discovery tool (Reverb) using information from this record.


Link: GET SERVICE > ACCESS MAP VIEWER
Description: View a time series animation of the annual surface melt climatologies in Google Earth™.


Link: VIEW PROJECT HOME PAGE
Description: PARCA Program Web page.


Link: VIEW RELATED INFORMATION
Description: NSIDC offers some of our data in the form of images. We have created Google Earth™ files that enable you to overlay these and other data-based images on a virtual globe.


Geographic Coverage
 N: 84.0 S: 60.0  E: -10.0  W: -73.0

Data Set Citation
Dataset Originator/Creator: Waleed Abdalati
Dataset Title: Greenland Ice Sheet Melt Characteristics Derived from Passive Microwave Data
Dataset Release Date: 2008-02-25
Dataset Release Place: Boulder, Colorado USA
Dataset Publisher: National Snow and Ice Data Center (NSIDC)
Data Presentation Form: digital media
Online Resource: http://nsidc.org/data/nsidc-0218.html


Temporal Coverage
Start Date: 1979-04-02


Location Keywords
CONTINENT > NORTH AMERICA > GREENLAND
GEOGRAPHIC REGION > ARCTIC
GEOGRAPHIC REGION > POLAR


Data Resolution
Latitude Resolution: 25 km
Longitude Resolution: 25 km


Science Keywords
CRYOSPHERE >SNOW/ICE >SNOW MELT    [Definition]
TERRESTRIAL HYDROSPHERE >SNOW/ICE >SNOW MELT    [Definition]


ISO Topic Category
GEOSCIENTIFIC INFORMATION
IMAGERY/BASE MAPS/EARTH COVER


Platform
DMSP 5D-2/F11 >Defense Meteorological Satellite Program-F11    [Information]
DMSP 5D-2/F13 >Defense Meteorological Satellite Program-F13    [Information]
DMSP 5D-2/F8 >Defense Meteorological Satellite Program-F8    [Information]
NIMBUS-7    [Information]
SATELLITES    [Information]


Instrument
SMMR >Scanning Multichannel Microwave Radiometer    [Information]
SSMI >Special Sensor Microwave/Imager    [Information]


Project
EOSDIS >Earth Observing System Data Information System    [Information]
ESIP >Earth Science Information Partners Program    [Information]
PARCA >Program in Arctic Regional Climate Assessment    [Information]


Keywords
Greenland
Ice Sheet
PARCA
Passive Microwave
Passive Microwave Data
Polar Stereographic
SMMR
Snow Melt
SSM/I


Data Set Progress
IN WORK


Data Center
NSIDC Distributed Active Archive Center    [Information]
Data Center URL: http://nsidc.org/daac/index.html

Data Center Personnel
Name: NSIDC USER SERVICES
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA


National Snow and Ice Data Center    [Information]
Data Center URL: http://nsidc.org

Data Center Personnel
Name: NSIDC USER SERVICES
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA



Distribution
Distribution_Media: FTP
Distribution_Size: 0 - 16 KB per file
Distribution_Format: ASCII text

Distribution_Media: FTP
Distribution_Size: 13 KB per file
Distribution_Format: binary

Distribution_Media: FTP
Distribution_Size: 2 - 4 KB per file
Distribution_Format: GeoTIFF


Personnel
WALEED ABDALATI
Role: INVESTIGATOR
Email: waleed.abdalati at colorado.edu
Contact Address:
University of Colorado-Boulder/ CIRES
Director of ESOC/Associate Professor of Geography
City: Boulder
Province or State: CO
Postal Code: 80309
Country: USA


NSIDC USER SERVICES
Role: TECHNICAL CONTACT
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA


Publications/References
Abdalati, Waleed and Konrad Steffen. 2001. Greenland Ice Sheet Melt Extent: 1979-1999. Journal of Geophysical Research (Atmospheres) 106(D24): 33983-8.

Abdalati, Waleed and Konrad Steffen. 1997. Snowmelt on the Greenland Ice Sheet as Derived from Passive Microwave Satellite Data. Journal of Climate 10: 165-75.

Abdalati, Waleed and Konrad Steffen. 1995. Passive Microwave-derived Snow Melt Regions on the Greenland Ice Sheet. Geophysical Research Letters 22: 787-790.

Abdalati, Waleed and J. Stroeve. 1993. Climate Sensitivity Studies of the Greenland Ice Sheet Using Satellite AVHRR, SMMR, SSM/I, and In Situ Data. Meteorology and Atmospheric Physics 51: 239-258.

Jezek, K. C., C. Merry, D. Cavalieri, S. Grace, J. Bedner, D. Wilson, and D. Lampkin. 1991. Comparison Between SMMR and SSM/I Passive Microwave Data Collected Over the Antarctic Ice Sheet. Byrd Polar Research Center Technical Report 91-03, Ohio State University, Columbus OH, 62 pp.

Mätzler, C. H. and R. Hüppi. 1989. Review of Signature Studies for Microwave Remote Sensing of Snowpacks. Advances in Space Research 9: 253-265.

Ulaby, F. T., R. K. Moore, and A. K. Fung. 1982. Radar Remote Sensing and Surface Scattering and Emission Theory. Microwave Remote Sensing. Vol. 2, Artech House.

Ulaby, F. T., R. K. Moore, and A. K. Fung. 1986. From Theory to Applications. Microwave Remote Sensing. Vol. 3, Artech House.

Creation and Review Dates
DIF Creation Date: 2008-02-19
Last DIF Revision Date: 2012-05-14


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