四川盆地及東部山區(qū)暖季降水的日變化特征

doi:10.12306/2022jms.0025

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四川盆地及東部山區(qū)暖季降水的日變化特征
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                        10.12306/2022jms.0025
                    
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中圖分類號(hào):P426.614
基金項(xiàng)目:國(guó)家自然科學(xué)基金資助項(xiàng)目(41775058)

Analysis of diurnal variations of precipitation in warm season between Sichuan Basin and its eastern mountains

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摘要:

利用國(guó)家氣象信息中心1998—2018年分辨率為0.1°×0.1°的降水融合資料和ERA5小時(shí)再分析數(shù)據(jù),分析了四川盆地及東部山區(qū)6—9月降水的日變化特征及成因。研究表明,四川盆地(簡(jiǎn)稱盆地)降水量和頻次有相似的日變化特征,盆地降水主要集中在夜間至清晨,降水高值區(qū)東傳到達(dá)盆地東部山區(qū)后,降水量和頻次都減少,東部山區(qū)沒(méi)有明顯的降水東傳特征。夜間至清晨,盆地東南山地背風(fēng)坡形成了較強(qiáng)的下沉氣流,促進(jìn)盆地低層形成質(zhì)量堆積,同時(shí)盆地氣旋性渦旋、水汽輸入和大氣層結(jié)不穩(wěn)定的增強(qiáng),造成盆地降水增強(qiáng)。盆地東南地區(qū)水汽通量方向自東南轉(zhuǎn)為偏南以及盆地低層水汽輻合區(qū)向東擴(kuò)展為盆地降水高值區(qū)向東傳播提供水汽條件。盆地東部山區(qū)降水量峰值時(shí)間呈早晨和午后的雙峰型分布,與地形觸發(fā)局地性降水有關(guān)。受大氣層結(jié)穩(wěn)定性、山地氣旋環(huán)流和山地—平原螺線管環(huán)流日變化的影響,盆地東部山區(qū)降水頻次峰值時(shí)間呈午后的單峰型分布。

Abstract:

The spatial and temporal characteristics of hourly mean precipitation in warm season (June-September) over Sichuan Basin and the eastern mountains were analyzed by using the fusion precipitation data, which are available on 0.1°×0.1° grids through 1998 to 2018 obtained from the National Meteorological Information Center, and ERA5 hourly reanalysis data. Results show that the precipitation and frequency in the basin have similar diurnal variation characteristics. The precipitation in the basin is mainly concentrated from night to morning. After the high-value precipitation area reaches the eastern mountainous area of the basin, the precipitation and frequency decrease, and there is no obvious eastward transmission characteristics in the eastern mountainous area. From night to morning, a strong downhill wind was formed on the leeward side of the southeast mountain of the basin, which promoted the formation of mass accumulation in the lower layer of the basin. At the same time, the cyclonic vortex, water vapor input and atmospheric instability in the basin are enhanced, resulting in the enhancement of precipitation in the basin. The eastward propagation of high precipitation value area is related to the shift of water vapor flux direction from southeast to south in the southeast of the basin and the eastward expansion of water vapor convergence area in the lower layer of the basin. The peak time of precipitation in the eastern mountainous area of the basin shows a bimodal distribution in the morning and afternoon, and the spatial distribution is disordered, which may be related to triggering local heavy precipitation under complex terrain conditions. The peak time of precipitation frequency shows a single peak distribution in the afternoon, which is mainly affected by the stability of atmospheric stratification, the daily variation of mountain cyclone circulation and mountain plain solenoid circulation.

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鄧德鈺,李艷,陳鮮艷.四川盆地及東部山區(qū)暖季降水的日變化特征.氣象科學(xué),2024,44(3):451-461 DENG Deyu, LI Yan, CHEN Xianyan. Analysis of diurnal variations of precipitation in warm season between Sichuan Basin and its eastern mountains. Journal of the Meteorological Sciences,2024,44(3):451-461

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收稿日期:2021-01-04
最后修改日期:2022-03-15
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在線發(fā)布日期: 2024-07-16
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