華南前汛期典型旱澇年降水的低頻特征及其與冷空氣的關(guān)系

doi:10.3969/2017jms.0003

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華南前汛期典型旱澇年降水的低頻特征及其與冷空氣的關(guān)系
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                        10.3969/2017jms.0003
                    
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基金項(xiàng)目:國家自然科學(xué)基金重點(diǎn)資助項(xiàng)目（91637211；41541037）；國家自然科學(xué)基金面上資助項(xiàng)目（41375057）；湖北省氣象局科技發(fā)展基金（2017C05）

Study on the low-frequency features of precipitation in serious flood and drought pre-flood seasons over South China and its relationship with cold air

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利用國家氣象信息中心提供的1961—2010年華南85站逐日降水及NCEP/NCAR逐日再分析資料，選取2004、2010年為華南前汛期降水典型旱、澇年，分別統(tǒng)計(jì)旱澇年降水及冷空氣低頻特征，討論低頻冷空氣與低頻降水的關(guān)系，并揭示低頻冷空氣信號源地。結(jié)果表明：（1）澇年降水存在10~20 d和30~60 d顯著低頻周期，旱年還存在20~30 d低頻周期。無論旱澇年，低頻位渦與同頻域降水呈顯著的正相關(guān)關(guān)系，其中10~20 d低頻位渦與同頻域降水的關(guān)系最為密切；（2）澇年華南前汛期10~20 d低頻冷空氣直接源地位于華北至渤海一帶，南傳特征明顯，高層冷空氣源地位于平流層低層西西伯利亞地區(qū)，高層高位渦空氣沿315 K等熵面向低層輸送，干侵入為西北路徑。旱年對流層低層冷空氣傳播特征不明顯，高層冷空氣源地位于平流層低層?xùn)|北地區(qū)，由于高低層位渦傳輸通道斷裂，導(dǎo)致冷空氣活動減弱，降水減少，干侵入為東北路徑。

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85-station daily precipitation data provided by the National Meteorological Information Center and NCEP/NCAR reanalysis data from 1961-2010 are used to select 2004 and 2010 as the serious drought and flood year of pre-flood precipitation over South China. The low-frequency characteristics of precipitation and cold air and their relationship are also be investigated. The main results are as follows:(1)The pre-flood season precipitation in flood year is mainly controlled by 10-20 d and 30-60 d oscillation. In drought year, 20-30 d is another significant low-frequency cycle. The low frequency potential vorticity has positive correlation with the same frequency precipitation, especially for 10-20 d low frequency potential vorticity. (2)For the flood year, the direct source of the 10-20 d low frequency cold air locates from the North China to the Bohai Sea area. Inclined 315 K isentropic surfaces from west Siberia region are the areas where vertical vorticity grows quickly most easily, it is also the path along which the upper cold air intrudes. For the drought year, there is little cold air transportation in the lower troposphere. 10-20 d low-frequency precipitation is influenced by the high potential vorticity pools which exists in upper troposphere (lower stratosphere) is the main source.

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許冠宇,楊浩,王曉芳,李麗平.華南前汛期典型旱澇年降水的低頻特征及其與冷空氣的關(guān)系.氣象科學(xué),2018,38(2):167-176 XU Guanyu, YANG Hao, WANG Xiaofang, LI Liping. Study on the low-frequency features of precipitation in serious flood and drought pre-flood seasons over South China and its relationship with cold air. Journal of the Meteorological Sciences,2018,38(2):167-176

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收稿日期:2016-06-03
最后修改日期:2017-02-27
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在線發(fā)布日期: 2018-06-22
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