Variation Characteristics of Sunshine Duration from 1961 to 2020 in Dingxi

doi:10.11924/j.issn.1000-6850.casb2022-0132

Abstract

Abstract:

To analyze the variation characteristics of sunshine duration in Dingxi City, the data of Dingxi Meteorological Observation Station from 1961 to 2020 was used, and the involved elements were: sunshine duration, precipitation, relative humidity, cloud amount and water vapor pressure. The interdecadal, interannual, seasonal and monthly variation characteristics of sunshine duration were analyzed by using the linear trend analysis, Mann-Kendall test and path analysis. In addition, the main meteorological factors affecting the variation of sunshine duration were discussed. The results showed that: the annual sunshine duration in Dingxi City had obvious interdecadal variation characteristics from 1961 to 2020, and the sunshine duration significantly decreased in the 1980s and 2000s (P<0.05) and its fluctuating trend also decreased with a linear tendency rate of -10.7 h/10 a (P<0.05). The maximum value of annual sunshine duration was 2790.2 h, which appeared in 1963, the minimum value of annual sunshine duration was 2159.7 h, which appeared in 1988, and the range was 810.5 h. The annual sunshine duration had abrupt change in 1967 and 1993. The sunshine duration showed obvious seasonal variation characteristics, which increased in spring with a linear tendency rate of 5.1 h/10 a, but decreased in summer, autumn and winter, and the decrease rate in summer was the largest (-8.9 h/10 a). There were differences in the variation trend of monthly sunshine duration, it decreased significantly in June (P<0.05), but not obvious (P>0.05) in other months. Sunshine duration had extremely obvious negative correlation with precipitation, relative humidity, cloud amount and water vapor pressure, and the main meteorological factors affecting sunshine hours were different in different seasons. The most obvious effect of meteorological factors on sunshine duration was found in autumn (R=0.862), and that in spring came the second. Relative humidity made the greatest contribution to the change of spring and annual sunshine duration variation, but it was the total cloud amount that mostly affected the sunshine duration change in summer, autumn and winter. This study can provide important reference for the efficient utilization of climate resources under the background of climate warming.

Key words: Dingxi, sunshine duration, climate tendency rate, Mann-Kendall test, path analysis

SHANG Junlin, LEI Jun, YAO Yubi, YAO Rui, LU Guoyang, LUAN Zhenbin, CHANG Jinhui. Variation Characteristics of Sunshine Duration from 1961 to 2020 in Dingxi[J]. Chinese Agricultural Science Bulletin, 2023, 39(5): 116-123.

Figures/Tables 9

References 37

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	1月	2月	3月	4月	5月	6月	7月	8月	9月	10月	11月	12月
平均日照/h	195.6	182.4	204.0	223.4	241.7	233.2	227.1	215.9	163.0	170.9	184.2	204.2
气候倾向率/(h/a)	-0.334	0.021	0.279	0.339	-0.072	-0.528^*	0.130	-0.379	-0.205	-0.289	0.097	-0.263

	1月	2月	3月	4月	5月	6月	7月	8月	9月	10月	11月	12月
平均日照/h	195.6	182.4	204.0	223.4	241.7	233.2	227.1	215.9	163.0	170.9	184.2	204.2
气候倾向率/(h/a)	-0.334	0.021	0.279	0.339	-0.072	-0.528^*	0.130	-0.379	-0.205	-0.289	0.097	-0.263

气象因子	春季	夏季	秋季	冬季	年
降水量/mm	86.2	213.1	92.5	9.1	400.9
变化趋势/10 a	-0.61	-0.06	-6.56^*	0.96^**	-6.22
相关系数	-0.262^*	-0.396^**	-0.497^**	-0.427^**	-0.313^*
相对湿度/%	56.1	66.7	71.0	59.5	63.3
变化趋势/10 a	-2.09^**	-1.07^**	-1.23^**	-0.65	-1.23^**
相关系数	-0.553^**	-0.381^**	-0.585^**	-0.464^**	-0.419^**
平均总云量/成	4.6	6.7	6.6	5.9	5.9
变化趋势/(成/10 a)	1.24^*	0.56	0.95	0.43	0.75^*
相关系数	-0.472^**	-0.471^**	-0.816^**	-0.637^**	-0.358^**
水汽压	6.0	13.3	7.6	2.4	7.3
变化趋势(hPa/10 a)	0.11^*	0.06	0.06	0.07^**	0.02
相关系数	-0.376^**	-0.409^**	-0.614^**	-0.343^**	-0.344^**

气象因子	春季	夏季	秋季	冬季	年
降水量/mm	86.2	213.1	92.5	9.1	400.9
变化趋势/10 a	-0.61	-0.06	-6.56^*	0.96^**	-6.22
相关系数	-0.262^*	-0.396^**	-0.497^**	-0.427^**	-0.313^*
相对湿度/%	56.1	66.7	71.0	59.5	63.3
变化趋势/10 a	-2.09^**	-1.07^**	-1.23^**	-0.65	-1.23^**
相关系数	-0.553^**	-0.381^**	-0.585^**	-0.464^**	-0.419^**
平均总云量/成	4.6	6.7	6.6	5.9	5.9
变化趋势/(成/10 a)	1.24^*	0.56	0.95	0.43	0.75^*
相关系数	-0.472^**	-0.471^**	-0.816^**	-0.637^**	-0.358^**
水汽压	6.0	13.3	7.6	2.4	7.3
变化趋势(hPa/10 a)	0.11^*	0.06	0.06	0.07^**	0.02
相关系数	-0.376^**	-0.409^**	-0.614^**	-0.343^**	-0.344^**

	b₁	b₂	b₃	b₄	R
春季	0.137	-0.754^**	-0.400^**	0.223	0.701
夏季	-0.034	-0.173	-0.387^**	-0.077	0.527
秋季	0.307*	-0.480^**	-0.756^**	0.033	0.862
冬季	-0.008	-0.265	-0.529^**	-0.027	0.689
年	0.064	-0.428^**	-0.345*	0.012	0.533