| 华北春季沙尘暴频次与环流年际变率的相关分析 |
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| 引用本文： | 毛睿,龚道溢.华北春季沙尘暴频次与环流年际变率的相关分析[J].高原气象,2007,26(5):1023-1030. |
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| 作者姓名： | 毛睿 龚道溢 |
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| 作者单位： | 北京师范大学,资源学院地表过程与资源生态国家重点实验室,北京,100875 |
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| 基金项目： | 国家重点基础研究发展计划项目(2006CB400505)，国家自然科学基金项目(40675035)共同资助 |
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| 摘 要： | 分析了近40年来华北春季沙尘暴频次与前秋、前冬和当年春季大尺度大气环流因子的关系,重点是检查年际尺度上的相关。结果表明,年际尺度上与沙尘暴频次有密切关系的环流因子包括:春季太平洋/北美遥相关型(PNA)、春季北太平洋指数(NP)、冬季亚洲区极涡面积。前者为正相关,后二者为负相关。这与用包含低频变率的原始序列进行分析的结果有很大的不同。原始序列分析的结果表明,与华北沙尘暴频次有关的环流因子主要是春季太平洋准10年振荡(PDO,为负相关),春季北半球极涡面积和亚洲区极涡面积(正相关)、前冬西大西洋型(WA,为正相关),以及前秋亚洲区极涡面积(正相关)。说明在不同时间尺度上,大气环流因子有不同的作用。此外,除了PNA、NP和亚洲区极涡面积外,年际尺度上ENSO及WA也可能对沙尘暴频次存在适度的影响。年际尺度上春季12个环流因子对春季沙尘暴频次的方差贡献率为65.3%。
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| 关 键 词： | 华北 年际变率 春季沙尘暴 环流因子 |
| 文章编号： | 1000-0534（2007）05-1023-08 |
| 修稿时间： | 2006-07-10 |
Correlation Analysis of Interannual Variability between Spring Dust Storm frequency and Atmospheric Circulation Factors |
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| MAO Rui,GONG Dao-yi.Correlation Analysis of Interannual Variability between Spring Dust Storm frequency and Atmospheric Circulation Factors[J].Plateau Meteorology,2007,26(5):1023-1030. |
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| Authors: | MAO Rui GONG Dao-yi |
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| Institution: | State Key Laboratory of Earth Surface Processes and Resource Ecology(Beijing Normal University |
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| Abstract: | The relationship of spring dust storm frequency in Northern China with the previous autumn,the previous winter and the spring atmospheric circulation over the periods of 40 years are analyzed.The point is mainly to examine the correlation between dust storms frequency and atmospheric circulation on the interannual time scale.The results show that the atmospheric circulation factors have close relationship with dust storm frequency in interannual scale,including: Pacific North American pattern(PNA),spring North Pacific(NP) and the area of Asian polar vortex(PVA1) in winter.There is significant positive correlation between PNA and dust storm frequency,and negative correlation of NP and PVA1 with dust storm frequency.These results are not the same with that computed by the original dataset including low frequency variability.The results computed by the original dataset show that the atmospheric circulation factors influencing on dust storm frequency in Northern China mainly are the spring Pacific Decadal Oscillation(PDO,negative correlation),the area of Northern Hemispheric polar vortex(PVA,positive correlation) in spring,PVA1 in spring(positive correlation) and PVA1 in previous autumn(positive correlation).These results imply that the influence of circulation factors on different time scales is different.In addition,besides PNA,NP and PVA1,it seems that ENSO and western Atlantic pattern (WA) maybe have some moderate influence on the dust storm frequency.Interannually the variance of spring dust storm frequency explained by 12 atmospheric circulation factors is 65.3%. |
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| Keywords: | North China Interannual variability Spring dust storm Atmospheric circulation factor |
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