PARCA: Program for Regional Climate Assessment
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About PARCA

PARCA is a NASA project formally initiated in 1995 by combining into one coordinated program various investigations associated with efforts, started in 1991, to assess whether airborne laser altimetry could be applied to measure ice-sheet thickness changes. It has the prime goal of measuring and understanding the mass balance of the Greenland ice sheet.

Main Program Components

  • Periodic airborne laser-altimetry surveys along precise repeat tracks across all major ice drainage basins. The first survey was completed in 1993/1994, with repeat flights along selected routes in 1995 and 1996, when flights were also made over ice caps in eastern Canada, Svalbard, and Iceland.
  • Ice-thickness measurements along the same flight lines
  • Localized measurements of ice thickness change in shallow drill holes.
  • Monitoring of various surface characteristics of the ice sheet using satellite radar altimetry, SAR, passive-microwave, AVHRR, and scatterometer data.
  • Surface-based measurements of ice motion at 30-km intervals approximately along the 2000-meter contour completely around the ice sheet, with interpolation of local relative ice motion using interferometric SAR.
  • Shallow ice cores (10 - 200 meters) at many locations to infer recent climate history, atmospheric chemistry, and interannual variability of snow-accumulation rates, and to measure temperature and vertical ice motion at various depths.
  • Investigations of surface energy balance and factors affecting snow accumulation and surface ablation. This program is a collaborative effort with NSF, and includes the installation of automatic weather stations (AWS) at many of the drill-hole sites.
  • Estimating snow-accumulation rates by climate-model analysis of column water vapor obtained from radiosondes and TOVS data.
  • Detailed investigations of individual glaciers and ice streams responsible for much of the outflow from the ice sheet.
  • Development of a thermal probe to measure various ice characteristics at selected depths in the ice sheet.
  • Continuous monitoring of crustal motion using Global Positioning System (GPS) receivers at coastal sites.

PARCA Research Groups

  • Cold Regions Research and Engineering Laboratory (CRREL), Hanover, NH
  • NASA: Headquarters, Washington DC
  • NASA: Goddard Space Flight Center, Greenbelt, MD
  • NASA: Wallops Flight Facility, Wallops Island, VA
  • NOAA: Geosciences Laboratory, Office of Ocean and Earth Sciences, Boulder, CO
  • The Ohio State University: Byrd Polar Research Center, Columbus, OH
  • University of Arizona: Department of Hydrology and Water Resources, Tucson, AZ
  • University of Colorado: CIRES, Boulder, CO
  • University of Colorado: Institute of Arctic and Alpine Research (INSTAAR), Boulder, CO
  • University of Georgia, Department of Geography, Athens, GA
  • University of Maryland, Joint Center for Earth System Science, College Park, MD
  • University of Nebraska: Snow and Ice Research Group (SIRG), Lincoln, NE
  • University of Kansas: Radar Systems and Remote Sensing Laboratory, Lawrence, KS
  • University of Missouri at Kansas City, Department of Elec. Engineering, Kansas City, MO





PARCA is a program of the Konrad Steffen Research Group at CIRES.