Mean air temperatures of Greenland


Autoria(s): Reeh, Niels
Cobertura

MEDIAN LATITUDE: 74.158190 * MEDIAN LONGITUDE: -43.053267 * SOUTH-BOUND LATITUDE: 60.030000 * WEST-BOUND LONGITUDE: -72.920000 * NORTH-BOUND LATITUDE: 83.630000 * EAST-BOUND LONGITUDE: -16.670000

Data(s)

20/07/1991

Resumo

Melt rate and surface temperature on the Greenland ice sheet are parameterized in terms of snow accumulation, mean annual air temperatur and mean July air temperature. Melt rates are calculated using positive degree-days, and firn warming (i.e. the positive deviation of the temperature at 10-15 m depth from the mean annual air temperature) is estimated from the calculated amount of refrozen melt water in the firn. A comparison between observed and calculated melt rates shows that the parameterization provides a reasonable estimate of the present ablation rates in West Greenland between 61°N and 76°N. The average equilibrium line elevation is estimated to be about 1150 m and 1000 m for West and East Greenland respectively, which is several hundred meter lower than previous estimates. However, the total annual ablation from the ice sheet is found to be about 280 km**3 of water per year which agrees well with most other estimates. The melt-rate model predicts significant melting and consequently significant firn warming even at the highest elevations of the South Greenland ice sheet, whereas a large region of central Greenland north of 70° N experiences little or no summer melting. This agrees with the distribution of the dry snow facics as given by BENSON (1962).

Formato

application/zip, 2 datasets

Identificador

https://doi.pangaea.de/10.1594/PANGAEA.763302

doi:10.1594/PANGAEA.763302

Idioma(s)

en

Publicador

PANGAEA

Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted

Fonte

Supplement to: Reeh, Niels (1991): Parameterization of melt rate and surfaee temperature on the Greenland lee Sheet. Polarforschung, 59(3), 113-128, hdl:10013/epic.29636.d001

Palavras-Chave #Comment; delta T; Elevation; ELEVATION; Estimated; Greenland; Latitude; LATITUDE; Longitude; LONGITUDE; MAAT; Observed; Res [K]; RES [K]; Station; Temperature, air, annual mean; Temperature, air, monthly mean; Temperature, difference; TMJ; TTT monthly m
Tipo

Dataset