| 天津地区近40年日照时数变化特征及其影响因素 |
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| 引用本文： | 郭军,任国玉.天津地区近40年日照时数变化特征及其影响因素[J].气象科技,2006,34(4):415-420. |
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| 作者姓名： | 郭军 任国玉 |
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| 作者单位： | 1. 天津市气象局气候服务中心,天津,300074
2. 国家气候中心,北京,100081 |
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| 基金项目： | 全国水资源综合规划研究专题“气候变化对中国水资源情势影响的综合分析”项目资助 |
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| 摘 要： | 对天津市区、西青、蓟县、塘沽4个站1961~2003年日照时数以及对日照有影响的云量、水汽压和地面能见度等资料的进行了统计分析。结果表明:天津地区日照时数呈明显的下降趋势,1961~2003年4站气候变化率分别是为每10年-177.3-、165.2-、174.1-、145.6 h。与60年代相比,90年代4站的年日照时数分别减少了425.1、403.4、486.03、77.5 h,相当于市区每日的日照时数减少了1.2 h、西青1.1 h、蓟县1.3 h、塘沽1.0 h。40年来云量和水汽压的变化不大,而地面能见度呈下降趋势。能见度下降可能主要是对流层大气气溶胶含量上升的结果,这是造成天津地区日照时数减少的主要原因。
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| 关 键 词： | 天津地区 日照时数 能见度 气溶胶 气候变化 |
| 收稿时间： | 2005-03-13 |
| 修稿时间： | 2005-05-16 |
Variation Characteristics of Sunshine Duration in Tianjin in Recent 40 Years and Influential Factors |
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| Guo Jun,Ren Guoyu.Variation Characteristics of Sunshine Duration in Tianjin in Recent 40 Years and Influential Factors[J].Meteorological Science and Technology,2006,34(4):415-420. |
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| Authors: | Guo Jun Ren Guoyu |
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| Institution: | 1 Tianjin Municipal Climate Service Center, Tianjin 300074; 2 National Climate Center, Beijing 100081 |
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| Abstract: | The yearly averaged sunshine duration,cloud cover,surface vapor pressure and visibility from four meteorological stations(the urban area,Xiqing,Jixian and Tanggu) in Tianjin are analyzed.The results show that the sunshine duration decreased significantly for the past 40 years at the four stations;the variation rates of the annual sunshine duration are-177.3,-165.2,-174.1 and-145.6 hours per ten years,respectively;compared to the 1960s,the mean annual sunshine durations decreased by 425.1,403.4,486.0,and 377.5 hours in the 1990s,which is equivalent to a decrease of 1.2,1.1,1.3,and 1.0 hours in daily sunshine duration for the four stations;there is no long-term variation trend in cloud cover and surface vapor pressure for the four stations,but surface visibility witnessed a tremendous drop in the analyzed period.It indicates that the principal cause for the sunshine duration variation is the decrease of surface visibility resulted from the increase of atmospheric aerosol concentration due to the rapid development of the local industries and economy. |
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| Keywords: | Tianjin sunshine duration surface visibility aerosol climate change |
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