Variation of Surface Solar Radiation over the Central and East of Southern China

Zheng Youfei; Guan Fulai; Cai Ziying; Wu Rongjun; Liu Jianjun

Vol.22, NO.3, 2011

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2011 > 22(3): 312-320

Zheng Youfei, Guan Fulai, Cai Ziying, et al. Variation of surface solar radiation over the central and East of Southern China. J Appl Meteor Sci, 2011, 22(3): 312-320.

Citation:

Zheng Youfei, Guan Fulai, Cai Ziying, et al. Variation of surface solar radiation over the central and East of Southern China. J Appl Meteor Sci, 2011, 22(3): 312-320.

Zheng Youfei, Guan Fulai, Cai Ziying, et al. Variation of surface solar radiation over the central and East of Southern China. J Appl Meteor Sci, 2011, 22(3): 312-320.

Citation:

Zheng Youfei, Guan Fulai, Cai Ziying, et al. Variation of surface solar radiation over the central and East of Southern China. J Appl Meteor Sci, 2011, 22(3): 312-320.

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Variation of Surface Solar Radiation over the Central and East of Southern China

1.
Nanjing University of Information Science & Technology, Nanjing 210044
2.
Hebei Provincial Meteorological and Eco-environmental Key Laboratory, Shijiazhuang 050021
3.
Tianjin Institute of Meteorology, Tianjin 300074

Received Date: 2010-03-13
Rev Recd Date: 2011-02-28
Publish Date: 2011-06-30

Abstract

Abstract

Surface solar radiation is one of most essential variables that influence the climate and environment. Various studies analyzing long-term records of surface radiation measurements suggest a widespread decrease in surface solar radiation between the 1950s and 1980s (global dimming), with a partial recovery more recently at many locations (brightening). To provide reasonable evidence for predicting the future trend of climate changes, the spatial and temporal variation of surface solar radiation and the causes are analyzed comprehensively by using observational solar radiation data together with conventional meteorological data of the central and east of southern China from 1961 to 2007.Solar radiation is obviously declining during 1961—1990 over the central and east of southern China, and a widespread brightening is observed during 1989—1995, but from 1995 to 2007 brightening doesn't persist and the solar radiation tendency tends to moderation. Increase of aerosol may be the main causes of solar radiation from dimming to brightening during 1961—1990, and the difference of cloud cover tendency maybe the main causes of solar radiation dimming.Model simulation shows that in recent 50 years water vapor is rising, which has decreased solar radiation by 0.55 W·m^-2 at the beginning of the 21st Century than that of the 1980s, but it is not main cause of solar radiation from dimming to bighting in recent 50 years. A widespread ascending aerosol optical depth (8.8%) is observed from 1980 to 2007, but the tendency tends to moderation. Due to the joint effect of atmosphere moisture and aerosol optical depth, a variation of aerosol direct radiative forcing is weakened, and the overall trend shows that aerosol direct radiative forcing variation trend to moderation (0.22 W·m^-2 in the country and 0.29 W·m^-2 in the city).Entering the 21st Century, solar radiation tends to moderation. This tendency indicates the cause for solar radiation change of China in the 1990s is different from Europe and America, and aerosol decline is not the major contributor. On the other hand, it also demonstrates if the air quality improves in the future, the solar radiation over the central and east of southern China may rise again.
- surface solar radiation;
- water vapor;
- aerosol;
- cloud cover

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References(34)

Figures and Tables

Fig. 1 Variation of annual-averaged surface solar radiation over the central and east of southern China during 1961—2007

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Fig. 2 Variation of annual-averaged cloud cover over the central and east of southern China during 1961—2007

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Fig. 3 Variation of annual-averaged aerosol optical thickness over the central and east of southern China

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Fig. 4 Distribution of aerosol radiative forcing on country surface over the central and east of southern China during 1980—2007 (unit: W·m^-2)

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Fig. 5 Distribution of aerosol radiative forcing on city surface over the central and east of southern China during 1980—2007(unit: W·m^-2)

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Fig. 6 Variation of aerosol radiative forcing on country surface over the central and east of southern China from 1980s to the beginning of the 21st Century (unit: W·m^-2)

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Fig. 7 Variation of aerosol radiative forcing on city surface over the central and east of southern China from 1980s to the beginning of the 21st Century (unit: W·m^-2)

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Fig. 8 Variation of drop extinction over the central and east of southern China from 1980s to the beginning of the 21st Century (unit: W·m^-2)

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Table 1 Decrease and ascend in surface solar radiation over the central and east of southern China during 1961—2007

时段	日射站数量	上升站点数量	通过0.05显著性检验上升站点数量	下降站点数量	通过0.05显著性检验下降站点数量
1961—1989年	22	2	0	20	18
1989—1995年	18	16	9	2	1
1995—2007年	29	14	1	15	0

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Table 2 The long trend of annual-averaged surface solar radiation over the central and east of southern China during 1961—2007

时段	线性倾向率/(W·m^-2·a^-1)	R²
1961—1989年	-1.078	0.7648^**
1989—1995年	3.270	0.7909^*
1995—2007年	0.058	0.0051
注：*为通过0.01显著性检验，为通过0.05显著性检验。

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Table 3 The long trend of cloud cover, visibility, surface solar radiation over the central and east of southern China during 1989—2005

站点	1989—1995年			1995—2005年
站点	云量 /(10^-2/10 a)	能见度 /(km/10 a)	地面太阳总辐射 /(W·m^-2/10 a)	云量 /(10^-2/10 a)	能见度 /(km/10 a)	地面太阳总辐射 /(W·m^-2/10 a)
济南	-1.49	0.32	29.05	0.58	2.02	-6.02
郑州	-1.22	-0.85	27.66	0.11	-0.80	6.13
宜昌	-1.02		61.92	0.26		12.38
武汉	-0.23	-1.55	52.20	-0.14	-0.38	4.51
长沙	-1.15	-2.74	42.01	-0.55	1.87	-21.99
桂林	0.08	-2.76	73.26	-0.60	-0.04	14.81
赣州	-0.32	-0.37	33.56	0.34	1.94	-9.84
固始	-1.24	-2.53	39.70	0.22	1.09	3.13
南京	-1.67	-0.63	8.68	0.29	-1.63	16.09
合肥	-1.60		75.58	0.03		11.69
上海	-0.62		17.48	-0.38		4.28
杭州	-1.39	0.96	57.99	-0.65	-0.95	18.40
南昌	-0.85		39.12	-0.61		2.31
福州	-0.70	1.68	47.80	-0.35	-0.76	-0.58
广州	-0.09	0.05	-22.92	-0.78	0.81	7.41
汕头	-0.30	-0.07	39.00	-0.68	0.17	2.66
南宁	0.00	-1.62	-76.50	-0.46	1.35	17.48
海口	0.33	0.25	16.90	-0.11	-0.28	2.31

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