HR: 0830h
AN: A31D-0081    [PDF]
TI: Core Atmospheric Measurements at the Summit, Greenland Environmental Observatory: GEOSummit
AU: * Burkhart, J F
EM: johnny@hwr.arizona.edu
AF: Department of Hydrology and Water Resources, University of Arizona, PO 210011, TUS, AZ 85721-0011 United States
AU: Bales, R C
EM: Roger Bales [roger@eng.ucmerced.edu]
AF: School of Engineering, University of California - Merced, PO 2039, Merced, CA 95344 United States
AU: McConnell, J R
EM: jmcconn@dri.edu
AF: Division of Hydrologic Sciences, Desert Research Institute, 2215 Raggio Parkway, Reno, NV 89512 United States
AB: A program is being implemented for long-term measurements of the Arctic atmosphere, snow and other Earth system components at the Summit, Greenland Environmental Observatory (GEOSummit), located at an elevation of 3100 m on the Greenland ice sheet. GEOSummit was the site of the Greenland Ice Sheet Project 2 (GISP2) ice core studies, completed in 1993, and has been a site of atmospheric, snow, and other geophysical measurements ever since. It is currently the only high-altitude site for atmospheric and related measurements in the Arctic. Many of these measurements, previously made intermittently at GEOSummit, resumed on a continuous basis beginning in summer 2003 and will be made publicly available. Core atmospheric and snow measurements provide a baseline for the continued operation of GEOSummit as a long-term site for year-round disciplinary and interdisciplinary measurements and research. Because changes in Arctic atmospheric circulation are cyclic over 4-5 year or longer times, long-duration measurements are being made available to understand circulation and to place observed changes in a long-term perspective. The availability of the GEOSummit measurements encourages and facilitates multi-disciplinary research by providing a high-quality core of baseline observations. The current program continues and expands the core baseline measurements at GEOSummit for a five-year period, beginning in summer 2003. GEOSummit is currently a partnership between NSF-OPP, NOAA-CMDL, and investigators from Denmark, Germany and Switzerland. Baseline measurements include meteorology, radiation, tropospheric and aerosol chemistry, snow properties and snow chemistry as well as carbon cycle compounds, chlorofluorocarbons, radiation, and ozone. Average water accumulation at GEOSummit is 21 g cm2 y-1, with annual patterns varying significantly from year to year. The mean annual temperature is ~-30 oC, varying between -70 and 0 oC. Near-surface summertime ozone averages 55 ppbv. Aerosol fluxes and atmospheric gas concentrations (e.g., O3, CO, CO2, CH4) exhibit characteristic annual cycling.
UR: http://www.geosummit.org
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0330 Geochemical cycles
DE: 1600 GLOBAL CHANGE (New category)
DE: 1800 HYDROLOGY
DE: 9315 Arctic region
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting