Chlorine activation in the Arctic winter
| Project/Area Number |
24740318
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | Chiba University |
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Principal Investigator |
Saitoh Naoko 千葉大学, 環境リモートセンシング研究センター, 助教 (50391107)
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| Project Period (FY) |
2012-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
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| Keywords | 成層圏オゾン / 塩素化合物 / 極成層圏雲（PSCs） / 国際宇宙ステーション / 人工衛星 / 国際情報交換 |
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| Outline of Final Research Achievements |
We have analyzed ISS/JEM/SMILES and SCISAT-1/ACE-FTS data to discuss the relationship between temperature and stratospheric minor gases related to ozone depletion in the Arctic winter of 2009/2010. From mid-January to early February, SMILES ClO concentrations were higher than 0.5 ppbv at equivalent latitudes higher than 70° and solar zenith angles lower than 96°, where the temperatures were well lower than 200 K. HCl and ClONO2 decreased and ClO increased in mid-January. In the end of January, ClO started to decrease and HCl and ClONO2 increased at the same time. We have compared Cly values calculated based on N2O concentration from ACE-FTS (Cly-calc.) with Cly values derived by the sum of ClO, HCl, HOCl, and ClONO2 (Cly-obs.). The Cly-obs. values drastically decreased lower than the Cly-calc. at equivalent latitudes higher than 70° in January. This suggests the occurrence of ClO dimmer there that could not be observed by ACE-FTS and SMILES.
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Report
(5 results)
Research Products
(7 results)
