2006 Fiscal Year Final Research Report Summary
Diurnal variations due to atmosphere-ocean-land interactions and their climatological significance
| Project/Area Number |
16340141
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 | Independent Administration Institution, Japan Agency for Marine-Earth Science and Technology (JAMSTEC) (2006)
Kobe University (2004-2005) |
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Principal Investigator |
YAMANAKA Manabu D. Independent Administration Institution, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Institute of Observational Research for Global Change, Senior Scientist, 地球環境観測研究センター, 特任研究員 (30183982)
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| Co-Investigator(Kenkyū-buntansha) |
OGINO Shin-Ya Independent Administration Institution, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Institute of Observational Research for Global Change, Senior Scientist, 地球環境観測研究センター, 研究員 (80324937)
MORI Shuichi Independent Administration Institution, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Institute of Observational Research for Global Change, Sub-Leader, 地球環境観測研究センター, サブリーダー (00344309)
HASHIMOTO George L. Kobe University, Graduate School of Science and Technology, Research Associate, 自然科学研究科, 助手 (10372658)
IWAYAMA Takahiro Kobe University, Graduate School of Science and Technology, Associate Professor, 自然科学研究科, 助教授 (10284598)
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| Project Period (FY) |
2004 – 2006
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| Keywords | Indonesian maritime continent / sea-land breeze circulation / atmospheric thermal tide / monsoon circulation / meridional circulations / horizontal convection theory / terrestrial planets / climate variability |
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| Research Abstract |
Observations over the Indonesian "maritime continent" have shown striking diurnal variations with horizontal scales of about a thousand kilometers, which are different from known sea-land breeze and local circulations and from global atmospheric tides. Similar phenomena are also seen in Tibet-Himalaya and North-American continent. Furthermore, in other planets (Venus and Mars) there are several types of diurnal variations.
Those diurnal variations have been investigated on the basis of atmospheric dynamics and cloud physics. Their effects on intraseasonal, seasonal (annual) and interannual variations have been studied. Since the diurnal periodicity is originated from solar radiation dependent on the planetary rotation and revolution, the significance of such astronomical conditions in determination of the planetary climate has been also studied.
Over the maritime continent, the diurnal variations in rainy season are dominant rather than those in clear days or in dry season expected in classical sea-land breeze theories. The diurnal variations in rainy seasons are enhanced by themselves ; active convective clouds and rainfall in the afternoon and nighttime "reset" the atmospheric instability and turbidity before sunrise, and the maximum solar radiation (close to the solar constant) heats the land surface before the noontime which generates convective clouds again in the afternoon.
Migrations of clouds with diurnal cycles, response of large-scale atmosphere for diurnal variations, geographical variations among the maritime continent and neighborhood (Indian and Pacific) oceans have been studied. The planetary climate with various astronomical conditions and cloud condensation constituents has been also studied.
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[Journal Article] Vertical wind characteristics in precipitating cloud systems over west Sumatera, Indonesia, observed with Equatorial Atmosphere Radar : Case study on 23-24 April 2004 during the first CPEA Campaign Period.2006
Author(s)
Mori, S., Hamada J.-I., M.D.Yamanaka, Y.-M.Kodama, M.Kawashima, T.Shimomai, Y.Shibagaki, H.Hashiguchi, T.Sribimawati
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Journal Title
J.Meteor.Soc.Japan 84A
Pages: 113-131
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Seasonal and interannual variations of diurnal cycles of local circulation and cloud activity observed at Serpong, West Jawa, Indonesia.2006
Author(s)
Araki, R., M.D.Yamanaka, F.Murata, H.Hashiguchi, Y.Oku, T.Sribimawati, M.Kudsy, F.Renggono
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Journal Title
J.Meteor.Soc.Japan 84A
Pages: 171-194
Description
「研究成果報告書概要(欧文)」より
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