| Project/Area Number |
13640438
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
|
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| Research Institution | Nara Women's University |
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Principal Investigator |
HAYASHIDA Sachiko Nara Women's University, Fuculty of Science, Professor, 理学部, 教授 (70180982)
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| Project Period (FY) |
2001 – 2002
|
| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2002: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2001: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Keywords | Atomospheric Science / Polar Stratospheric Clouds / Stratospheric Aerosol / Stratospheric Ozone |
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| Research Abstract |
The Improved Limb Atmospheric Spectrometer (ILAS) captured many Polar Stratospheric Cloud (PSC) events in the Northern Hemisphere during the winter and early spring of 1997. The ILAS aerosol extinction coefficient and nitric acid data were compared with the theoretically predicted values for supercooled ternary solution (STS), nitric acid dihydrate (NAD) and nitric acid trihydrate (NAT) particles at equilibrium to infer the chemical composition of the observed PSC particles. The observations showed that in 1997, nitric acid-containing solid and liquid PSCs formed over the Arctic during winter and early spring, until mid-March. Some typical STS PSCs were found in mid-January, though some of the events seemed to involve ice particles. Most of the PSCs observed late in the PSC season had features of nitric acid-containing hydrates. An intensive analysis of the temperature histories suggested that most of the STS particles observed in January had experienced the thermal conditions necessary for the formation of liquid particles.
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