1998 Fiscal Year Final Research Report Summary
Diurnal Variation of Precipitation and Moisture Transport by Local Circulations
| Project/Area Number |
08454128
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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 | UNIVERSITY OF TSUKUBA |
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Principal Investigator |
KIMURA Fujio University of Tsukuba, Professor., 地球科学系, 教授 (10225055)
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| Project Period (FY) |
1996 – 1999
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| Keywords | PRECIPITATION / DIURNAL VARIATION / LOCAL CIRCULATION / MOISTURE TRANSPORT / MOUNTAIN |
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| Research Abstract |
This study reveals the relation of probability of precipitation and moisture transport by the local circulations, which are generated by the contrast of land /sea or mountain/valley. Field experiments, data analysis and numerical experiments are carried out. Precipitable water vapor obtained by GPS (Gloval Positioning System) are also used for the analysis.
As the results, it was shown that the precipitation in the Kanto area on the calm clear days in summer has the following characteristics :
1.Probability density of precipitation has clear diurnal variation with the maximum in late afternoon or early evening.
2.Horizontal distribution of probability density of precipitation correlate well with orograpy.
3.The orographic effects is lareger than the effect of the contrast of land and sea.
4. Probability density of precipitation becomes large in the mountainous region in the afternoon, and then high probability density area extends toward the plain.
These results show that the moisture transport by local circulations has strong relationship with convective precipitation developed over mountainous region in summer. For the prediction of these convective precipitation, i.e., thunder storms, observing precipitable water vapor is very important.
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Research Products
(22 results)
