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DOI | 10.1029/2018GL079682 |
North Atlantic Natural Variability Modulates Emergence of Widespread Greenland Melt in a Warming Climate | |
Hahn, L.; Ummenhofer, C. C.; Kwon, Y. -O. | |
2018-09-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:17页码:9171-9178 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Record-breaking melt over Greenland in recent decades is linked not only to climate change but also to natural variability, including persistent atmospheric high-pressure conditions in the negative phase of the North Atlantic Oscillation and warm North Atlantic Ocean temperatures during the positive phase of the Atlantic Multidecadal Oscillation. However, the relative importance of natural variability for Greenland melt under varying degrees of greenhouse forcing is still unclear. Using reanalysis data and a large ensemble of climate model simulations, we find that a negative North Atlantic Oscillation and positive Atlantic Multidecadal Oscillation consistently promote heightened summer melt under various forcing conditions. Moreover, timing of widespread 21st century Greenland melt varies considerably between ensemble members due to different phasing of these modes of natural variability. These results indicate the importance of natural modes of variability across a range of external forcing conditions for interannual melt variability and the emergence of widespread Greenland melt. Plain Language Summary Extreme Greenland Ice Sheet melt is partly driven by climate change, as rising greenhouse gas concentrations promote warmer temperatures, especially for the Arctic region. However, natural fluctuations in the climate system can also promote Greenland melt. In particular, persistent high-pressure systems in the atmosphere over the region and warm North Atlantic Ocean temperatures have been linked to enhanced Greenland melt in recent decades. Yet the importance of these natural oscillations for melt in the past and future remains unclear. We use a series of climate model simulations to show that high-pressure conditions and a warm North Atlantic Ocean consistently promote heightened summer melt under various warming scenarios for the past and future. Additionally, the timing of widespread Greenland melt in the 21st century depends on the timing of these modes of natural variability. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000445727500052 |
WOS关键词 | SURFACE MASS-BALANCE ; ICE-SHEET ; ATMOSPHERIC CIRCULATION ; MODEL ; OCEAN ; BLOCKING ; 20TH-CENTURY ; SYSTEM ; MAR |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/25747 |
专题 | 气候变化 |
作者单位 | Woods Hole Oceanog Inst, Dept Phys Oceanog, Woods Hole, MA 02543 USA |
推荐引用方式 GB/T 7714 | Hahn, L.,Ummenhofer, C. C.,Kwon, Y. -O.. North Atlantic Natural Variability Modulates Emergence of Widespread Greenland Melt in a Warming Climate[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(17):9171-9178. |
APA | Hahn, L.,Ummenhofer, C. C.,&Kwon, Y. -O..(2018).North Atlantic Natural Variability Modulates Emergence of Widespread Greenland Melt in a Warming Climate.GEOPHYSICAL RESEARCH LETTERS,45(17),9171-9178. |
MLA | Hahn, L.,et al."North Atlantic Natural Variability Modulates Emergence of Widespread Greenland Melt in a Warming Climate".GEOPHYSICAL RESEARCH LETTERS 45.17(2018):9171-9178. |
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