Affordable Access

Recent Greenland accumulation estimated from regional climate model simulations and ice core analysis

Authors
Publication Date

Abstract

clim_15_2103.2821_2832.tp 1 OCTOBER 2002 2821D E T H L O F F E T A L . q 2002 American Meteorological Society Recent Greenland Accumulation Estimated from Regional Climate Model Simulations and Ice Core Analysis* K. DETHLOFF Alfred Wegener Institute for Polar and Marine Research, Potsdam, Germany M. SCHWAGER Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany J. H. CHRISTENSEN AND S. KIILSHOLM Danish Meteorological Institute, Copenhagen, Denmark A. RINKE AND W. DORN Alfred Wegener Institute for Polar and Marine Research, Potsdam, Germany F. JUNG-ROTHENHA¨ USLER, H. FISCHER, S. KIPFSTUHL, AND H. MILLER Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany (Manuscript received 2 February 2001, in final form 7 March 2002) ABSTRACT The accumulation defined as ‘‘precipitation minus evaporation’’ over Greenland has been simulated with the high-resolution limited-area regional climate model HIRHAM4 applied over an Arctic integration domain. This simulation is compared with a revised estimate of annual accumulation rate distribution over Greenland taking into account information from a new set of ice core analyses, based on surface sample collections from the North Greenland Traverse. The region with accumulation rates below 150 mm yr21 in central-northwest Greenland is much larger than previously assumed and extends about 500 km farther to the south. It is demonstrated that good agreement between modeled and observed regional precipitation and accumulation patterns exists, partic- ularly concerning the location and the values of very low accumulation in the middle of Greenland. The accumulation rates in the northern part of Greenland are reduced in comparison to previous estimates. These minima are connected with a prevailing blocking high over the Greenland ice sheet and katabatic wind systems preventing humidity transports to central Greenland. The model reasonably represents the synoptic situations that lead to precipitation. Maxima

There are no comments yet on this publication. Be the first to share your thoughts.