A study of the mechanism of marine air intrusion toward the East Antarctica
| Project/Area Number |
25550022
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | Nagoya University |
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Principal Investigator |
Kurita Naoyuki 名古屋大学, 環境学研究科, 特任准教授 (60371738)
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| Co-Investigator(Kenkyū-buntansha) |
FUJIYOSHI Yasushi 北海道大学, 低温科学研究所, 特任教授 (40142749)
HIRASAWA Naohiko 情報・システム研究機構, 国立極地研究所・研究教育系, 助教 (10270422)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
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| Keywords | 南極 / 水循環 / 水蒸気同位体 / 洋上大気 / 水蒸気起源 / 南極観測 / 昭和基地 / フェーン現象 / 砕氷艦しらせ |
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| Outline of Final Research Achievements |
Recently, unusually high snowfall events, unprecedented for the past 60 years, have been observed in East Antarctica. Here we use shipboard observations of water vapor isotopologues along a ship track between Australia and Syowa on the East Antarctic coast, along with reanalysis data (ERA-Interim) to elucidate the mechanism by which large-scale circulations influences the marine air intrusions.
Generally, marine air intrusions play an important role in delivering heavy snowfall in Antarctica. Isotopic variations while the ship was near Syowa reflect the contribution of marine moisture to the total moisture in the air. In the case when maritime air masses were dominant corresponded to a period when poleward moisture flow was enhanced by large-scale circulation. This result indicates that large-scale flows push marine air mass toward the inland across the Antarctic coast. Recent unusual snowfall events may therefore reflect the large-scale circulation changes over the Southern Hemisphere.
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Report
(4 results)
Research Products
(1 results)
