淮河流域6—7月澇年降水的10~30d低頻振蕩特征

doi:10.3969/2014jms.0001

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淮河流域6—7月澇年降水的10~30d低頻振蕩特征
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                        10.3969/2014jms.0001
                    
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基金項目:淮河流域氣象開放研究基金項目(HRM201202);江蘇省高校自然科學研究重大項目(14KJA170004);江蘇省"333"工程;江蘇省"青藍工程"

Characteristics of 10-30 days low-frequency oscillation during flood years from June to July over the Huaihe River Basin

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利用1981—2010年全國753站逐日降水資料,NCEP/NCAR逐日再分析資料和NOAA向外長波輻射資料,通過小波分析和Lanczos濾波的方法,得到淮河流域6—7月澇年降水的10~30 d低頻振蕩特征并進行了分析.結(jié)果表明:(1)淮河流域6—7月澇年降水具有明顯的10~30 d周期變化.(2)位于高、低空的低頻(10~30 d)反氣旋和氣旋分別影響南亞高壓和西太平洋副熱帶高壓的東西進退,從而影響淮河流域的低頻降水強度.(3)在850 hPa上,南海上空的低頻反氣旋(氣旋)和日本海地區(qū)的低頻氣旋(反氣旋)使得淮河流域有(無)冷暖氣流交匯,并隨著低頻反氣旋和氣旋向東北方向移動,造成淮河地區(qū)低頻降水發(fā)展為活躍(中斷)期.(4)在低頻降水過程中,低頻OLR負(正)值區(qū)域發(fā)展加強對應淮河流域降水過程加強(減弱),當負(正)值區(qū)到達淮河流域時,淮河流域降水到達極端活躍(中斷)期.隨后低頻OLR負(正)值區(qū)向東移動,淮河流域低頻降水過程向過渡期轉(zhuǎn)變.

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By using the daily precipitation data during 1981—2010 from 753 stations in China, NCEP/NCAR daily reanalysis data and the Outing Longwave Radiation (OLR) data, the characteristics of 10-30 days low-frequency oscillation during flood years from June to July over the Huaihe River Basin are investigated by the methods of wavelet analysis and Lanczos filter. Results show as follows. (1) 10-30 days variation is obvious in the flood years during June-July over Huaihe River Basin. (2)The 10-30 days low-frequency anticyclone and cyclone in the lower (upper) troposphere modulate the western North Pacific subtropical high (South Asian High) extending westward or retreating eastward, so as to influence the low-frequency precipitation intensity over Huaihe River Basin during the flood years. (3) The low-frequency anticyclone over the South China Sea and the low-frequency cyclone over the Sea of Japan at 850 hPa contribute to a confluence of cold and warm air over Huaihe River Basin. With their northwarding movement, the low-frequency rainfall in Huaihe River Basin becomes active, vice versa. (4) With the negative (positive) area of the low-frequency OLR extending, the corresponding low-frequency precipitation in the Huaihe River Basin strengthens (weakens) gradually. The low-frequency rainfall becomes active (breaking) when the negative (positive) area covers the Huaihe River Basin. Subsequently, the negative (positive) area moves eastward and the low-frequency rainfall turns to the transition period.

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韓世茹,王黎娟,于波,龐玥.淮河流域6—7月澇年降水的10~30d低頻振蕩特征.氣象科學,2014,34(6):629-637 HAN Shiru, WANG Lijuan, YU Bo, PANG Yue. Characteristics of 10-30 days low-frequency oscillation during flood years from June to July over the Huaihe River Basin. Journal of the Meteorological Sciences,2014,34(6):629-637

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收稿日期:2013-11-08
最后修改日期:2014-01-07
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在線發(fā)布日期: 2015-01-14
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