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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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中国中东部秋季PM10时空变化及其与日气温的关系
DOI: 10.11821/xb201209001, PP. 1155-1164
Keywords: 中国,秋季,PM10,气温,辐射,相关分析
Abstract:
利用2000-2010年秋季中国中东部83个重点城市的PM10浓度数据以及其中63个城市的逐日气象资料,分析了PM10浓度的时空变化以及晴空条件下PM10浓度与日气温之间的关系,讨论了不同云量条件下二者关系的稳定性以及辐射的相应变化。结果表明(1)近11年来,秋季PM10浓度呈现下降趋势,全部天气条件下和晴空条件下的线性趋势值分别为-2.87μg·m-3/年、-4.92μg·m-3/年;空间分布上,中国中东部重点城市的秋季PM10浓度普遍下降,其中华北地区的下降最快最显著。(2)秋季PM10浓度与日气温的波动之间存在显著相关,定量统计表明当PM10浓度偏高10μg·m-3时,日最高气温、日最低气温和日平均气温分别偏低0.15℃、0.14℃和0.16℃,同时气温日较差减小0.01℃。(3)秋季日气温的上述变化可能主要与气溶胶的直接效应有关。PM10增多会造成地面总辐射和地表净辐射的显著减少,进而造成日最高气温、日平均气温的显著下降;同时,PM10增多对近地面的影响总体上是致冷效果。
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