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中文摘要：
汇总河南省108个地面站1981—2010年的气象资料，利用每日14时实测的气象要素和天气现象资料对霾日进行判别，统计各站的霾日数据，分析了河南霾日的变化特征，并对其可能的原因做了分析。结果表明：1981年以来，河南平均年霾日数呈现明显上升，增长率为4．2d／lOa；季节之间，以冬季最多，占全年的46．2％，秋季次之，春夏较少；河南霾天气主要以轻微霾为主，占总霾日数的90％以上；霾天气发生时相对湿度多≤60％，能见度多〈3km；近30年，河南年平均风速和年最大风速（-厂≥10m／s）日数呈显著减少，年静风或微风（最大风速〈3m／s）的日数呈显著增加；分析霾日数与风速和降水的相关关系发现，霾日数同风速呈显著负相关，月霾日数同月降水日数呈显著负相关，各因子间以与风速相关性最大。另外，霾日数的变化与河南区域经济发展引起的污染排放存在一定的对应关系。因此，近30年，河南风速下降是霾日数明显增多可能的主要气候原因，同时，区域污染排放增长也可能是霾日数增多的原因之一。
英文摘要：
Based on meteorological data during 1981 -2010 from 108 ground stations in Henan province, and by using weather factors and weather phenomena data measured at 14：00 daily, haze days are identified. Change characteristics of haze days of Henan are analyzed on the basis of statistical data of haze days from each station, and the possible reasons are analyzed. Results show that the number of annual haze days in Henan since 1981 increases obviously with an increasing rate of 4.2 d/10a. The winter haze, which account for 46.2% of the whole seasonal change of the haze presents the highest number of the year, the haze days in Autumn rank second, and spring and summer are the lowest. The main haze there is mild, which accounted for above 90% of the proportion of the total haze; the haze weather occurred with the relative humidity below 60% and with the visibility less than 3 km; For nearly 30 years, the annual mean wind speed had tended to decrease, the number of annual days with wind force f /〉 10 m/s had also decreased, and the number of annual breeze days had obviously risen; Analysis on correlation among haze days, wind speed and precipitation indicates that the number of haze days is obviously negative correla- ted with wind speed, and is significant negative correlated with precipitation, but related closest with wind speed. In addition, there is a corresponding relationship between the change of haze days and atmospheric pollution emis- sions caused by human activities. In conclusion, for nearly 30 years the decrease of wind speed might be the main climate reason which the number of haze days increases and meantime the increase of pollution emissions is also one of the possible reasons in Henan.
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