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Influence of large‐scale atmospheric circulation on marine air intrusion toward the East Antarctic coast
Author(s) -
Kurita Naoyuki,
Hirasawa Naohiko,
Koga Seizi,
Matsushita Junji,
SteenLarsen Hans Christian,
MassonDelmotte Valérie,
Fujiyoshi Yasushi
Publication year - 2016
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2016gl070246
Subject(s) - atmospheric circulation , oceanography , front (military) , intrusion , geology , climatology , cold front , precipitation , environmental science , atmospheric sciences , meteorology , geography , geochemistry
Abstract Marine air intrusions into Antarctica play a key role in high‐precipitation events. Here we use shipboard observations of water vapor isotopologues between Australia and Syowa on the East Antarctic coast to elucidate the mechanism by which large‐scale circulation influences marine air intrusions. The temporal isotopic variations at Syowa reflect the meridional movement of a marine air front. They are also associated with atmospheric circulation anomalies that enhance the southward movement of cyclones over the Southern Ocean. The relationship between large‐scale circulation and the movement of the front is explained by northerly winds which, in association with cyclones, move toward the Antarctic coast and push marine air with isotopically enriched moisture into the inland covered by glacial air with depleted isotopic values. Future changes in large‐scale circulation may have a significant impact on the frequency and intensity of marine air intrusion into Antarctica.