DOI: 10.5194/tc-10-1739-2016
Scopus记录号: 2-s2.0-84982102953
论文题名: Annual Greenland accumulation rates (2009-2012) from airborne snow radar
作者: Koenig L ; S ; , Ivanoff A ; , Alexander P ; M ; , MacGregor J ; A ; , Fettweis X ; , Panzer B ; , Paden J ; D ; , Forster R ; R ; , Das I ; , McConnell J ; R ; , Tedesco M ; , Leuschen C ; , Gogineni P
刊名: Cryosphere
ISSN: 19940416
出版年: 2016
卷: 10, 期: 4 起始页码: 1739
结束页码: 1752
语种: 英语
英文关键词: airborne sensing
; climate modeling
; glacier mass balance
; ice core
; ice sheet
; radar altimetry
; regional climate
; remote sensing
; sea level change
; snow accumulation
; Arctic
; Greenland
; Greenland Ice Sheet
英文摘要: Contemporary climate warming over the Arctic is accelerating mass loss from the Greenland Ice Sheet through increasing surface melt, emphasizing the need to closely monitor its surface mass balance in order to improve sea-level rise predictions. Snow accumulation is the largest component of the ice sheet's surface mass balance, but in situ observations thereof are inherently sparse and models are difficult to evaluate at large scales. Here, we quantify recent Greenland accumulation rates using ultra-wideband (2-6.5 GHz) airborne snow radar data collected as part of NASA's Operation IceBridge between 2009 and 2012. We use a semiautomated method to trace the observed radiostratigraphy and then derive annual net accumulation rates for 2009-2012. The uncertainty in these radar-derived accumulation rates is on average 14ĝ%. A comparison of the radar-derived accumulation rates and contemporaneous ice cores shows that snow radar captures both the annual and long-term mean accumulation rate accurately. A comparison with outputs from a regional climate model (MAR) shows that this model matches radar-derived accumulation rates in the ice sheet interior but produces higher values over southeastern Greenland. Our results demonstrate that snow radar can efficiently and accurately map patterns of snow accumulation across an ice sheet and that it is valuable for evaluating the accuracy of surface mass balance models. © 2016 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75100
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: National Snow and Ice Data Center, University of Colorado, Boulder, CO, United States; ADNET Systems Inc., Bethesda, MD, United States; NASA Goddard Institute for Space Studies, New York, NY, United States; Cryospheric Sciences Laboratory (Code 615), NASA Goddard Space Flight Center, Greenbelt, MD, United States; Department of Geography, University of Liège, Belgium; Center for Remote Sensing of Ice Sheets, University of Kansas, Lawrence, KS, United States; Department of Geography, University of Utah, Salt Lake City, UT, United States; Lamont-Doherty Earth Observatory, Columbia University, New York, NY, United States; Division of Hydrologic Science, Desert Research InstituteNV, United States
Recommended Citation:
Koenig L,S,, Ivanoff A,et al. Annual Greenland accumulation rates (2009-2012) from airborne snow radar[J]. Cryosphere,2016-01-01,10(4)