Near-surface-temperature lapse rates on the Prince of Wales Icefield, Ellesmere Island, Canada: implications for regional downscaling of temperature

被引:128
作者
Marshall, Shawn J.
Sharp, Martin J.
Burgess, David O.
Anslow, Faron S.
机构
[1] Univ Calgary, Dept Geog, Calgary, AB T2N 1N4, Canada
[2] Univ Alberta, Dept Earth & Atmospher Sci, Edmonton, AB, Canada
关键词
climate downscaling; lapse rates; glacier mass balance; surface energy balance; Canadian Arctic; mountain climatology;
D O I
10.1002/joc.1396
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
Screen temperatures were monitored from May 2001 to April 2003 in an array of 25 sites on the Prince of Wales Icefield, Ellesmere Island, Canada. The observational network covered an area of ca 15 650 km(2) and spanned an altitude ranging from 130 to 2010 m above sea level. The spatial array provides a record of near-surface-temperature lapse rates and mesoscale temperature variability on the icefield. The mean daily lapse rate in the 2-year record is -4.1 degrees C km(-1), with an average summer lapse rate of -4.3 degrees C km(-1). Surface-temperature lapse rates in the region are therefore systematically less than the free-air lapse rates that are typically adopted for extrapolations of sea-level temperature to higher altitudes. Steep lapse rates, resembling moist adiabatic rates in the free air (-6 to -7 degrees C km(-1)), are more common in summer at our site and are associated with enhanced cyclonic activity (low-pressure and high relative vorticity) and southerly flow aloft. In contrast, northerly, anticyclonic flow prevails when summer lapse rates are weak (above -2 degrees C km(-1)). The low surface-temperature lapse rates and their systematic synoptic variability have important implications for applications that require downscaling or extrapolation of surface- or boundary-layer temperatures, such as modelling of glacier mass balance. We illustrate this in an analysis of observed versus modelled snowmelt on the icefield. Copyright (C) 2006 Royal Meteorological Society.
引用
收藏
页码:385 / 398
页数:14
相关论文
共 59 条
[2]  
ALT BT, 1987, J CLIM APPL METEOROL, V26, P1605, DOI 10.1175/1520-0450(1987)026<1605:DSAFEM>2.0.CO
[3]  
2
[4]   A distributed surface energy-balance model for a small valley glacier .1. Development and testing for Haut Glacier d'Arolla, Valais Switzerland [J].
Arnold, NS ;
Willis, IC ;
Sharp, MJ ;
Richards, KS ;
Lawson, WJ .
JOURNAL OF GLACIOLOGY, 1996, 42 (140) :77-89
[5]   Sea-ice and meteorological conditions in northern Baffin Bay and the North Water Polynya between 1979 and 1996 [J].
Barber, DG ;
Hanesiak, JM ;
Chan, W ;
Piwowar, J .
ATMOSPHERE-OCEAN, 2001, 39 (03) :343-359
[6]   Measured and predicted air temperatures at basin to regional scales in the southern Appalachian mountains [J].
Bolstad, PV ;
Swift, L ;
Collins, F ;
Regniere, J .
AGRICULTURAL AND FOREST METEOROLOGY, 1998, 91 (3-4) :161-176
[7]   SYNOPTIC CLIMATOLOGY OF THE CANADIAN HIGH ARCTIC [J].
BRADLEY, RS ;
ENGLAND, J .
GEOGRAFISKA ANNALER SERIES A-PHYSICAL GEOGRAPHY, 1979, 61 (3-4) :187-201
[8]  
BRAITHWAITE RJ, 1989, GLAC QUAT G, V6, P219
[9]   Spatially distributed surface energy balance and ablation modelling on the ice cap of King George Island (Antarctica) [J].
Braun, M ;
Hock, R .
GLOBAL AND PLANETARY CHANGE, 2004, 42 (1-4) :45-58
[10]  
*ENV CAN, 2003, CAN CLIM DAT ONL