Mechanism of Orographic Precipitation around the Meghalaya Plateau Associated with Intraseasonal Oscillation and Diurnal Cycle
書誌事項
- タイトル別名
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- Mechanism of Orographic Precipitation around the Meghalaya Plateau Associated with Intraseasonal Oscillation and the Diurnal Cycle
- 公開日
- 2013-07
- 資源種別
- journal article
- 権利情報
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- © Copyright 2013 American Meteorological Society (AMS).
- DOI
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- 10.1175/mwr-d-12-00321.1
- 公開者
- American Meteorological Society
この論文をさがす
説明
Mesoscale processes that cause tremendous amounts of precipitation around the Meghalaya Plateau, northeast India, were investigated using a regional atmospheric model, with a particular focus on the possible role of an intraseasonal oscillation (ISO) and the diurnal cycle. A numerical experiment was conducted using the Weather Research and Forecasting Model (WRF) to simulate a prominent submonthly-scale ISO event observed during June–July 2004. A WRF experiment successfully simulated the timing and magnitude of precipitation during the first active period and subsequent inactive period of the ISO, despite large biases in the second active period. The WRF experiment revealed that the magnitude of prevailing southwesterly winds in the lower troposphere differs significantly between active and inactive periods; strong southwesterly flow transports abundant moisture to the southern slope of the Meghalaya Plateau during the active period, which triggers forced lifting and brings orographic precipitation. However, low-level wind during the inactive period is too weak to overcome the vertical stratification barrier; hence, it is unable to reach the condensation level. The WRF experiment suggested that the diurnal cycle of precipitation is enhanced during the active period, exhibiting an evening to early morning maximum, as observed by the Tropical Rainfall Measuring Mission (TRMM). The experiment also indicated a prominent nocturnal low-level jet (LLJ) appearing at 900 hPa. The direction of the LLJ varies clockwise with time, which accelerates the preexisting southwesterly flow during 1800–0600 LT. The diurnal variation of the LLJ is responsible for the evening to early morning maximum of precipitation, thus contributing to the precipitation variability in the ISO.
収録刊行物
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- Monthly Weather Review
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Monthly Weather Review 141 (7), 2451-2466, 2013-07
American Meteorological Society
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詳細情報 詳細情報について
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- CRID
- 1050869456410090880
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- NII論文ID
- 120005353241
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- NII書誌ID
- AA0074822X
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- ISSN
- 15200493
- 00270644
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- HANDLE
- 2115/53972
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- 本文言語コード
- en
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- 資料種別
- journal article
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- データソース種別
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