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| 1991～2004年不同环流背景下南宁市降水化学成分变化特征的研究 |
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郑凤琴1, 孙崇智2, 谢宏斌3
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1.广西区气象台, 广西, 南宁, 530022;2.广西区气象局, 广西, 南宁, 530022;3.南宁市环境监测站, 广西, 南宁, 530012
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| 摘要: |
| 利用1991～2004年广西南宁市降水化学成分资料,结合NCEP/NCAR再分析资料,分析了不同大气环流背景下南宁市降水化学成分的变化特征。结果表明,南宁市的酸雨属硫酸型,酸雨的形成与大气环流密切相关,影响南宁市酸雨的大气环流主要是高空槽锋面,其次是高压后部和热带气旋,受高空槽锋面特别是东路冷空气影响时,出现酸雨的频率最高,pH值最小,雨水中SO42-明显增多,热带气旋降水时,雨水酸度最轻,离子浓度甚至比高空槽锋面影响低2～3倍。 |
| 关键词: 大气环流 降水化学 雨水酸度分布 |
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| 基金项目:广西青年基金项目(桂科青0728035);广西科学研究与技术开发项目(桂科攻0322022-5)共同资助 |
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| STUDY ON CHEMICAL CONSTITUTION CHARACTERISTICS OF RAINWATER UNDER DIFFERENT ATMOSPHERIC CIRCULATION OVER NANNING CITY DURING 1991～2004 |
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ZHENG Feng-qin1, SUN Chong-zhi2, XIE Hong-bin3
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1.Guangxi Meteorological Observatory, Nanning 530022, China;2.Guangxi Meteorological Bureau, Nanning 530022, China;3.Nanning Environmental Monitoring Station, Nanning 530012, China
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| Abstract: |
| Based on the precipitation ionic constitution and NCEP/NCAR reanalysis data from 1991 to 2004,the chemical constitution characteristics of rainwater over Nanning in Guangxi was analyzed.The results indicate that the rainwater is of the type of sulfate.The formation of rainwater is related with atmospheric circulation — high-level troughs,the rear part of high pressures and tropical cyclones.When it is influenced by the rain-bearing system of an east-route cold air,the value of pH is the lowest and the ion concentration of sulfate radical increase to a very high level.When it is influenced by tropical cyclone systems,the acidity of rainwater is the least and the ion concentration is also 2～3 times lower than that of high-level trough. |
| Key words: atmospheric circulation rainwater chemistry rainwater acidity distribution |