中国东部夏季云量与日气温统计关系
作者简介:郭元喜(1983-),女,山东章丘人,博士研究生,主要从事气候变化研究。E-mail:guoyx@mail.bnu.edu.cn
收稿日期: 2012-03-22
要求修回日期: 2012-06-03
网络出版日期: 2013-01-20
基金资助
国家973项目(2012CB955302)、国家自然科学基金项目(40975043)资助
The Statistical Relationship Between Summer Cloud Cover and Daily Temperature in Eastern China
Received date: 2012-03-22
Request revised date: 2012-06-03
Online published: 2013-01-20
Copyright
郭元喜 , 龚道溢 , 汪文珊 , 毛睿 , 胡淼 . 中国东部夏季云量与日气温统计关系[J]. 地理科学, 2013 , 33(1) : 104 -109 . DOI: 10.13249/j.cnki.sgs.2013.01.104
Based on the data of daily temperature from 130 meteorological stations of Eastern China in 1980-2009, statistical relationship between cloud cover and temperature on no rain conditions were quantitatively analyzed, and the reason was explained from the perspective of radiation. It was showed that daily maximum temperature and daily mean temperature in Eastern China decreased significantly with the increasing of cloud cover, which is mainly because solar radiation and surface net radiation decreased significantly due to increase of cloud cover. This is in consistent with the relationship between daily maximum temperature, daily mean temperature and cloud cover in the whole China, in the Northern Hemisphere and even in the Globe. Specifically, the daily maximum temperature and daily mean temperature would decrease by 0.219℃ and 0.109℃ respectively as the total cloud cover increased by each 10 percent. And also, when low and middle cloud increased, the daily maximum temperature and daily mean temperature would decreased by 0.367℃ and 0.247℃ respectively, and when high cloud increased, the daily maximum temperature and daily mean temperature would decreased by 0.087℃ and 0.006℃ respectively. This significant negative correlation between daily maximum temperature, daily mean temperature and cloud cover may be mainly caused by the reduction of surface solar radiation and surface net radiation. In the northern part of the study region, daily minimum temperature increased significantly with the increase of total cloud, low and middle cloud, or high cloud, and in the south, it decreased significantly with the increase of total cloud or low and middle cloud. But it shows no obvious relationship with the amount of high cloud. This phenomenon can hardly be explained simply from the aspect of radiation effect, because there is a significant negative correlation between cloud cover and surface effective radiation. It was found that diurnal temperature range in Eastern China was significantly decreased with the increase of cloud cover, and the rate of reduction in the north is faster than that in the south.
Key words: Eastern China; summer; cloud cover; temperature; diurnal temperature range; radiation
Fig.1 Study area and site locations图1 研究区与站点位置 |
Fig.2 Mean values, standard errors and fitting results of daily temperature change with cloud cover图2 日气温随云量变化的平均值、标准误和线性拟合结果(虚线表示线性拟合关系) |
Fig.3 Spatial distribution of regression coefficients between daily temperature and cloud cover图3 日气温与云量回归系数的空间分布(℃/成)(外圈表示信度达到5%信度水平) |
Table 1 Correlation coefficients and regression coefficients between cloud cover and solar radiation表1 云量与辐射的相关系数、回归系数(J·m-2/成) |
直接辐射 | 散射辐射 | 总辐射 | 净短波辐射 | 地面有效辐射 | 净辐射 | ||
---|---|---|---|---|---|---|---|
总云量 | 相关系数 | -0.9857b | 0.9982b | -0.9646b | -0.9378b | -0.9737b | -0.9682b |
回归系数 | -125.11b | 47.89b | -84.57b | -62.78b | -22.21b | -43.86b | |
低中云量 | 相关系数 | -0.9793b | 0.9865b | -0.9732b | -0.9591b | -0.9873b | -0.9914b |
回归系数 | -123.75b | 34.93b | -100.55b | -80.72b | -31.22b | -56.64b | |
高云量 | 相关系数 | -0.9828b | 0.9960b | -0.9795b | -0.9498 b | -0.8622a | -0.9438b |
回归系数 | -121.26b | 59.56b | -60.08b | -43.55b | -23.08a | -26.43b |
The authors have declared that no competing interests exist.
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