Seasonal mass variations show timing and magnitude of meltwater storage in the Greenland Ice Sheet
文献类型：期刊论文
| 作者 | Fettweis, Xavier1; Liu, Lin2; Zhong, Min3; Klees, Roland8; Reijmer, Catharina H.7; Noel, Brice7; Wouters, Bert7; Enderlin, Ellyn M.4,5; Steger, Christian R.7; Moon, Twila6 |
| 刊名 | CRYOSPHERE
 |
| 出版日期 | 2018-09-21 |
| 卷号 | 12期号:9页码:2981-2999 |
| ISSN号 | 1994-0416 |
| DOI | 10.5194/tc-12-2981-2018 |
| 英文摘要 | The Greenland Ice Sheet (GrIS) is currently losing ice mass. In order to accurately predict future sea level rise, the mechanisms driving the observed mass loss must be better understood. Here, we combine data from the satellite gravimetry mission Gravity Recovery and Climate Experiment (GRACE), surface mass balance (SMB) output of the Regional Atmospheric Climate Model v. 2 (RACMO2), and ice discharge estimates to analyze the mass budget of Greenland at various temporal and spatial scales. We find that the mean rate of mass variations in Greenland observed by GRACE was between -277 and -269 Gt yr(-1) in 2003-2012. This estimate is consistent with the sum (i.e., -304 +/- 126 Gt yr(-1)) of individual contributions - surface mass balance (SMB, -216 +/- 122 Gt yr(-1)) and ice discharge (520 +/- 31 Gt yr(-1)) - and with previous studies. We further identify a seasonal mass anomaly throughout the GRACE record that peaks in July at 80-120 Gt and which we interpret to be due to a combination of englacial and subglacial water storage generated by summer surface melting. The robustness of this estimate is demonstrated by using both different GRACE-based solutions and different meltwater runoff estimates (namely, RACMO2.3, SNOWPACK, and MAR3.9). Meltwater storage in the ice sheet occurs primarily due to storage in the high-accumulation regions of the southeast and northwest parts of Greenland. Analysis of seasonal variations in outlet glacier discharge shows that the contribution of ice discharge to the observed signal is minor (at the level of only a few gigatonnes) and does not explain the seasonal differences between the total mass and SMB signals. With the improved quantification of meltwater storage at the seasonal scale, we highlight its importance for understanding glacio-hydrological processes and their contributions to the ice sheet mass variability. |
| 资助项目 | Chinese Scholarship Council ; National Natural Science Foundation of China[41474063] ; National Natural Science Foundation of China[41431070] ; National Natural Science Foundation of China[41674084] ; National Key Research and Development Program of China[2018YFC1406100] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB23030100] ; Dutch Technology Fellowship ; Polar Programme of the Netherlands Organization for Scientific Research (NWO/NPP) ; Netherlands Earth System Science Centre (NESSC) ; Hong Kong Research Grants Council[CUHK24300414] |
| WOS研究方向 | Physical Geography ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000445345300001 |
| 出版者 | COPERNICUS GESELLSCHAFT MBH |
| 源URL | [http://202.127.146.157/handle/2RYDP1HH/5814]  |
| 专题 | 中国科学院武汉植物园 |
| 通讯作者 | Ran, Jiangjun |
| 作者单位 | 1.Univ Liege, Dept Geog, Liege, Belgium 2.Chinese Univ Hong Kong, Fac Sci, Earth Syst Sci Programme, Hong Kong, Hong Kong, Peoples R China 3.Chinese Acad Sci, Inst Geodesy & Geophys, State Key Lab Geodesy & Earths Dynam, Wuhan, Hubei, Peoples R China 4.Univ Maine, Sch Earth & Climate Sci, Orono, ME USA 5.Univ Maine, Climate Change Inst, Orono, ME USA 6.Univ Colorado, Cooperat Inst Res Environm Sci, Natl Snow & Ice Data Ctr, Boulder, CO USA 7.Univ Utrecht, Inst Marine & Atmospher Res, Utrecht, Netherlands 8.Delft Univ Technol, Dept Geosci & Remote Sensing, Delft, Netherlands |
| 推荐引用方式 GB/T 7714 | Fettweis, Xavier,Liu, Lin,Zhong, Min,et al. Seasonal mass variations show timing and magnitude of meltwater storage in the Greenland Ice Sheet[J]. CRYOSPHERE,2018,12(9):2981-2999. |
| APA | Fettweis, Xavier.,Liu, Lin.,Zhong, Min.,Klees, Roland.,Reijmer, Catharina H..,...&Ran, Jiangjun.(2018).Seasonal mass variations show timing and magnitude of meltwater storage in the Greenland Ice Sheet.CRYOSPHERE,12(9),2981-2999. |
| MLA | Fettweis, Xavier,et al."Seasonal mass variations show timing and magnitude of meltwater storage in the Greenland Ice Sheet".CRYOSPHERE 12.9(2018):2981-2999. |
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来源：武汉植物园
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