| 气象因素对长三角背景地区甲烷浓度的影响分析 |
| 摘要点击 3150 全文点击 2010 投稿时间：2012-05-07 修订日期：2012-09-10 |
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| 中文关键词 CH4 临安区域大气本底站 气象因素 在线观测 浓度 |
| 英文关键词 CH4 Lin'an regional background station meteorological factors in-situ measurement concentration |
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| 中文摘要 |
| 通过分析2009年1月~2011年12月临安区域大气本底站在线观测获得的CH4浓度,研究地面风向、地面风速、地面气温、日照等气象因素对长三角背景地区CH4浓度的影响. 结果表明,临安站CH4浓度的日变化分布表现为单峰型形态,下午低、凌晨高,浓度日变幅在19.0×10-9~74.7×10-9(摩尔分数)之间; 季节变化特征表现为春季低、秋季高,月均浓度分布在1955.7×10-9~2036.2×10-9之间. NE~SSE风向上CH4浓度较高,SW~NNW风向上CH4浓度较低; 地面风速越大,CH4浓度越低; 地面气温升高,CH4浓度出现先升后降的分布; 随着日照时数的增加,CH4浓度亦表现为先升后降的分布特征. |
| 英文摘要 |
| Impacts of surface wind direction, surface wind speed, surface air temperature and sunshine hours on the CH4 concentration at Lin’an regional atmospheric background station were studied based on the results from Jan. 2009 to Dec. 2011.The results revealed that the diurnal variation of atmospheric CH4 concentration presented a single-peak curve at Lin'an regional background station. The diurnal amplitude varied from 19.0×10-9 to 74.7×10-9, with the lowest value observed in the afternoon and the highest at dawn. The monthly mean CH4 concentrations varied from 1955.7×10-9 to 2036.2×10-9, with the highest concentration observed in autumn and the lowest in spring. The wind directions NE-SSE could induce higher CH4 concentrations while SW-NNW wind directions had negative effects on the observed results. The CH4 concentration turned out to be lower with higher surface wind speed. With the increase of surface air temperature or sunshine hours, the CH4 concentration went up first till reaching a peak, and then decreased. |
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