| 贵州省旱涝急转时空特征与大气环流异常的联系 |
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| 引用本文： | 王玥彤,张娇艳,何东坡,陈早阳,王烁,曹蔚.贵州省旱涝急转时空特征与大气环流异常的联系[J].高原山地气象研究,2020,40(4):41-46. |
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| 作者姓名： | 王玥彤 张娇艳 何东坡 陈早阳 王烁 曹蔚 |
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| 作者单位： | 贵州省气候中心,贵阳550002;贵州省气象台,贵阳550002 |
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| 基金项目： | 国家自然科学基金(41865007)中国气象局预报员专项(CMAYBY2020-118)中国气象局预报员专项(CMAYBY2019-106) |
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| 摘 要： | 本研究利用1961～2019年贵州省5～8月逐月降水资料和同期NCEP/NCAR的再分析资料，结合长周期旱涝急转指数，分析贵州省夏季旱涝急转事件的时空变化特征及其与大气环流异常的联系。结果表明:贵州省夏季旱涝急转存在连续性和阶段性变化的特征，年代际差异较大，但总体涝转旱次数少于旱转涝次数。贵州省旱涝急转事件更容易出现在南部及东部。分析环流特征发现:旱转涝年，旱期中高纬地区纬向型环流，西太平洋副热带高压(下称:副高)面积偏小，脊点偏东，贵州省位于其北侧，低层为下沉运动；涝期为经向型环流，副高脊线位置偏南，面积偏小，贵州省位于副高西侧边缘，低层为上升运动。涝转旱年，涝期环流经向度大，冷空气活跃，副高位置偏南偏东，冷暖空气交汇于长江流域，利于贵州省降水偏多；旱期副高偏北偏东，贵州省受高压脊控制，干旱少雨。
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| 关 键 词： | 贵州省 旱涝急转 时空特征 大气环流 |
| 收稿时间： | 2020-09-15 |
Characteristics of Spatial Temporal Variation of Abrupt Drought-Flood Alternations in Guizhou Province and Anomalies of Atmospheric Circulation |
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| Affiliation: | 1. Guizhou Climate Center, Guiyang 550002, China;2. Guizhou Meteorological Observatory, Guiyang 550002, China |
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| Abstract: | Based on May to August monthly rainfall data in Guizhou province from 1961 to 2019,the re-analysis data from NCEP/NCAR,and long-cycle drought-flood abrupt alternations index,this study analyzes the spatial temporal variation characteristics of the abrupt drought-flood alternations in Guizhou province and its relationship with atmospheric circulation anomalies. The results show that the alternations in Guizhou have the characteristics of both phase continuity and intermittent coexist,with obvious interdecadal variation,but the times of flood-to-drought transition is less than that of drought-to-flood transition. The abrupt drought-to-flood alternations is more likely to appear in the southern and eastern parts of the province but weaker. The characteristics of the anomalous atmospheric circulation shows the drought period of drought-to-flood transition,the middle and high latitudes are zonal circulation,the area of the subtropical high is small,and the west ridge point is eastward. Guizhou province is located to the north of it,controlled by the sinking flow in lower layer. the conditions for water vapor transportation are poor,Flood period is radical circulation and the subtropical ridge is northward and smaller. Guizhou province located in the western edge of the subtropical ridge and the lower layer is in an upward movement. In the flood period of flood-to-drought situation,longitude of circulation is high and cold air is activity. The subtropical high is southward and eastward,wit the cold and warm air converging in the Yangtze River basin,which is conducive to more precipitation in Guizhou province. During the drought period,the subtropical high is northward and eastward,Guizhou province is controlled by the ridge of high pressure. |
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