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  • 1
    Publication Date: 2019-04-11
    Description: The dramatic changes in the Arctic climate system during recent decades are one of the most prominent features of global climate change. Two most striking and fundamental characteristics are the amplified near-surface warming at a rate twice the global average since the mid 20th century, and the rapid decline of sea-ice extent at a pace of 12.9% per decade and thinning of ice thickness by 40% since 1979. In conjunction with these changes, the frequency of occurrence of extreme climate and weather events has ostensibly increased across the Northern Hemisphere mid-latitudes, including adverse cold spells, severe heat waves, destructive floods, and persistent droughts. The fact that Arctic climate changes have coincided with an increase in the frequency of occurrence of extreme events has inspired broad interest in possible linkages — not only in the climate community, but also the general public, media agencies, and decision makers — in particular considering the projected future continuation and acceleration of Arctic warming and sea-ice decline.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
    Location Call Number Limitation Availability
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  • 2
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    SCIENCE CHINA PRESS
    In:  EPIC3Advances in Atmospheric Sciences, SCIENCE CHINA PRESS, ISSN: 0256-1530
    Publication Date: 2019-04-11
    Description: The influence of the Arctic atmosphere on Northern Hemisphere mid-latitude tropospheric weather and climate is explored by comparing the skill of two sets of 14-day weather forecast experiments using the ECMWF model with and without relaxation of the Arctic atmosphere towards ERA-Interim reanalysis data during the integration. Two pathways are identified along which the Arctic influences mid-latitude weather: a pronounced one over Asia and Eastern Europe, and a secondary one over North America. In general, linkages are found to be strongest (weakest) during boreal winter (summer) when the amplitude of stationary planetary waves over the Northern Hemisphere is strongest (weakest). No discernible Arctic impact is found over the North Atlantic and North Pacific region, which is consistent with predominantly southwesterly flow. An analysis of the flow-dependence of the linkages shows that anomalous northerly flow conditions increase the Arctic influence on mid-latitude weather over the continents. Specifically, an anomalous northerly flow from the Kara Sea towards West Asia leads to cold surface temperature anomalies not only over West Asia but also over Eastern and Central Europe. Finally, the results of this study are discussed in the light of potential mid-latitude benefits of improved Arctic prediction capabilities.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
    Location Call Number Limitation Availability
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