DOI: 10.5194/tc-12-701-2018
Scopus记录号: 2-s2.0-85042691985
论文题名: Spatiotemporal variability of Canadian High Arctic glacier surface albedo from MODIS data, 2001-2016
作者: Mortimer C ; , Sharp M
刊名: Cryosphere
ISSN: 19940416
出版年: 2018
卷: 12, 期: 2 起始页码: 701
结束页码: 720
语种: 英语
英文关键词: albedo
; annual variation
; glacier mass balance
; ice cap
; land surface
; MODIS
; North Atlantic Oscillation
; shortwave radiation
; spatial analysis
; spatiotemporal analysis
; temporal variation
; Canada
; Queen Elizabeth Islands
英文摘要: Inter-annual variations and longer-term trends in the annual mass balance of glaciers in Canada's Queen Elizabeth Islands (QEI) are largely attributable to changes in summer melt. The largest source of melt energy in the QEI in summer is net shortwave radiation, which is modulated by changes in glacier surface albedo. We used measurements from the Moderate Resolution Imaging Spectroradiometer (MODIS) sensors to investigate large-scale spatial patterns, temporal trends, and variability in the summer surface albedo of QEI glaciers from 2001 to 2016. Mean summer black-sky shortwave broadband albedo (BSA) decreased at a rate of 0.029±0.025decade1 over that period. Larger reductions in BSA occurred in July (0.050±0.031decade1). No change in BSA was observed in either June or August. Most of the decrease in BSA, which was greatest at lower elevations around the margins of the ice masses, occurred between 2007 and 2012, when mean summer BSA was anomalously low. The first principal component of the 16-year record of mean summer BSA was well correlated with the mean summer North Atlantic Oscillation index, except in 2006, 2010, and 2016, when the mean summer BSA appears to have been dominated by the August BSA. During the period 2001-2016, the mean summer land surface temperature (LST) over the QEI glaciers and ice caps increased by 0.049±0.038Cyr1, and the BSA record was negatively correlated (r: 0.86) with the LST record, indicative of a positive ice-albedo feedback that would increase rates of mass loss from the QEI glaciers. © Author(s) 2018. This work is distributed under the Creative Commons Attribution 4.0 License. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75410
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Canada
Recommended Citation:
Mortimer C,, Sharp M. Spatiotemporal variability of Canadian High Arctic glacier surface albedo from MODIS data, 2001-2016[J]. Cryosphere,2018-01-01,12(2)