globalchange  > 全球变化的国际研究计划
DOI: 10.1002/joc.6044
Scopus ID: 2-s2.0-85062517885
Atmospheric circulation modulates the spatial variability of temperature in the Atlantic–Arctic region
Author: Champagne O.; Pohl B.; McKenzie S.; Buoncristiani J.-F.; Bernard E.; Joly D.; Tolle F.
Source Publication: International Journal of Climatology
ISSN: 8998418
Publishing Year: 2019
Language: 英语
Keyword: Arctic amplification ; Atlantic–Arctic ; atmospheric circulation ; internal climate variability ; Reanalyses ; weather regimes
Scopus Keyword: Climate change ; Sea ice ; Uncertainty analysis ; Atmospheric circulation ; Geopotential height anomalies ; Internal climate variability ; Natural climate variabilities ; North Atlantic Ocean ; Reanalyses ; Temperature variability ; Weather regimes ; Atmospheric temperature
English Abstract: The Arctic region has experienced significant warming during the past two decades with major implications on the cryosphere. The causes of Arctic amplification are still an open question within the scientific community, attracting recent interest. The goal of this study is to quantify the contribution of atmospheric circulation on temperature variability in the Atlantic–Arctic region at decadal to intra-annual timescales from 1951 to 2014. Daily 20th Century reanalyses geopotential height anomalies at 500 hPa were clustered into different weather regimes to assess their contribution to observed temperature variability. The results show that in winter, 25% of the warming (cooling) in the North Atlantic Ocean (northeastern Canada) is due to temporal decreases of high geopotential anomalies in Greenland. This regime influences air mass migration patterns, bringing less cold (warm) air masses into these regions. Additionally, atmospheric warming or cooling has been attributed to a change in nearby oceanic basin surface conditions because of sea ice decline. In summer, about 15% of the warming observed in Norwegian/Greenland Seas is related to an increase in temporal anticyclonic patterns. This ratio reaches 37% in Norway due to an amplification from downwards solar radiation. This study allows for better understanding how natural climate variability modulates the regional signature of climate change and estimating the uncertainties in climate projections. © 2019 Royal Meteorological Society
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Document Type: 期刊论文
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Affiliation: School of Geography and Earth Sciences, McMaster University, Hamilton, ON, Canada; Biogéosciences, CNRS, Université de Bourgogne Franche-Comté, Dijon, France; ThéMA, CNRS, Université de Bourgogne Franche-Comté, Besançon, France

Recommended Citation:
Champagne O.,Pohl B.,McKenzie S.,et al. Atmospheric circulation modulates the spatial variability of temperature in the Atlantic–Arctic region[J]. International Journal of Climatology,2019-01-01
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