Observational Study on the Ground-based UVI at Dangxiong of Tibet

Chen Shu; Zheng Xiangdong; Lin Weili; Zhang Yong; Zaxi Dawa; Qi Donglin

doi:10.11898/1001-7313.20150410

Vol.26, NO.4, 2015

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Article Navigation > Journal of Applied Meteorological Science > 2015 > 26(4): 482-491

Chen Shu, Zheng Xiangdong, Lin Weili, et al. Observational study on the ground-based UVI at Dangxiong of Tibet. J Appl Meteor Sci, 2015, 26(4): 482-491. DOI: 10.11898/1001-7313.20150410.

Citation:

Chen Shu, Zheng Xiangdong, Lin Weili, et al. Observational study on the ground-based UVI at Dangxiong of Tibet. J Appl Meteor Sci, 2015, 26(4): 482-491. DOI: 10.11898/1001-7313.20150410.

Chen Shu, Zheng Xiangdong, Lin Weili, et al. Observational study on the ground-based UVI at Dangxiong of Tibet. J Appl Meteor Sci, 2015, 26(4): 482-491. DOI: 10.11898/1001-7313.20150410.

Citation:

Chen Shu, Zheng Xiangdong, Lin Weili, et al. Observational study on the ground-based UVI at Dangxiong of Tibet. J Appl Meteor Sci, 2015, 26(4): 482-491. DOI: 10.11898/1001-7313.20150410.

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Observational Study on the Ground-based UVI at Dangxiong of Tibet

DOI: 10.11898/1001-7313.20150410

1.
Key Laboratory for Atmospheric Chemistry, Institute of Atmospheric Composition, Chinese Academy of Meteorological Sciences, Beijing 100081
2.
Meteorological Observation Center of CMA, Beijing 100081
3.
Meteorological Bureau of Tibet Autonomous Region, Lhasa 850000
4.
Dangxiong Meteorological Bureau of Xizang, Dangxiong 851500
5.
Qinghai Institute of Meteorological Sciences, Xining 810000

Received Date: 2014-12-10
Rev Recd Date: 2015-03-30
Publish Date: 2015-07-31

Abstract

Abstract

Factors of solar zenith angle (SZA), cloud, ozone and snow cover modifying the surface ultraviolet index (UVI) in the Tibetan Plateau are presented by the TUV model simulations and the two-year continuous ground-based measurements at Dangxiong (30.48°N, 91.10°E, 4200 m a.s.l) from September 2009 to August 2011. Results show that the key factors affecting the UVI over the Tibetan region are SZA and cloud. Variations of cloud-free surface UVI can be characterized exactly as a simple empirical SZA function. The UVI cloud modification factor (CMF) generally reduces by 46% as the cloud amount increases from 0 to 100%. CMF might increase by 3%-6%, or even by 40% in individual cases if the solar disk is partly masked with broken clouds. The ozone valley enhances 12% summer surface UVI compared to plain regions of the similar latitudes. The winter short-term thin snow coverage could enhance 16% or less surface UVI, and this enhancement is lower than that from the simulations (23%). UVI attenuation caused by aerosols with optical depth of 0.02-0.1 is no more than 3%. As compared with UVI measured at Lhasa (29.67°N, 91.13°E, 3650 m a.s.l), Tuotuohe (34.22°N, 92.43°E, 4500 m a.s.l) and Waliguan (36.29°N, 100.90°E, 3810 m a.s.l), the difference of site-altitude is a key factor influencing the UVI. Under the same SZA conditions, the summer UVI at Lhasa is 7%-10% higher than that at Waliguan due to the southern thinner ozone layer, the ozone valley. Comparison with satellite-derived product shows that, averagely, the OMI-UVI is 80% higher than the ground-based values at Dangxiong but only 8.6% higher under cloud-free circumstances. The OMI-UVIs are all above 65% higher than those ground-based measurements at the other 3 sites but their cloud-free values are only 13%, 9% and 50% higher at Tuotuohe, Waliguan and Lhasa, respectively. Clouds and geographical mismatches between the satellite pixel and fixed ground-based observation site are supposed to be the main factors of higher space-based UVI values, particularly over Lhasa. As the ground-based UVI is more than 14, the coincident space-based UVI is generally 3% lower at Dangxiong owning to the broken clouds strengthening the in-situ radiation.
- UVI;
- Dangxiong of the Tibet;
- the Tibet Plateau;
- ground-based observation;
- satellite comparison

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References(33)

Figures and Tables

Fig. 1 Overview of UVI measured at Dangxiong

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图 2 当雄UVI (10 min平均) 随太阳天顶角的变化

(a) 所有天气，(b) 晴天

Fig. 2 UVI (10 min mean) as a function of SZA observed at Dangxiong

(a) all-sky, (b) cloud-free

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Fig. 3 Variations of CMF with changes of cloud amount at different SZAs

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Fig. 4 Comparison of UVI under conditions of different cloud coverage

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Fig. 5 UVI as a function of total ozone with SZA of 60°±2.5° under clear-sky condition

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图 6 当雄卫星过境时刻地基与卫星UVI值比较

(a) 所有天气，(b) 晴天

Fig. 6 UVI Comparison between satellite-derived overpass and ground-based measurements at Dangxiong under all sky conditions (a) and clear-day only (b)

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Table 1 Investigation of influences from snow coverage on UVI at Dangxiong

年份	日序	S_ZA=55°		S_ZA=60°		臭氧总量/DU	积雪	反照率
年份	日序	实测值	模式值	实测值	模式值	臭氧总量/DU	积雪	反照率
2009	323	4.81	5.32	3.45	3.82	260	有	0.8
2009	325	4.64	4.38	3.31	3.14	259	无	0.05
2009	330	4.62	4.37	3.28	3.13	260	无	0.05
2009	363	4.41	4.36	3.13	3.12	260	无	0.05
2010	2	5.14	5.35	3.66	3.84	259	有	0.8
2010	11	4.83	4.76	3.42	3.41	242	无	0.05

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Table 2 Comparison of ground-based UVI at Dangxiong, Tutuhe, Lhasa, Waliguan

太阳天顶角/(°)	当雄		沱沱河		拉萨		瓦里关
太阳天顶角/(°)	UVI	样本量	UVI	样本量	UVI	样本量	UVI	样本量
60	2.46±0.85	16631	2.14±0.85	186	1.7±0.53	1162	2.13±0.69	4657
50	4.41±1.61	17047	4.25±1.60	135	3.53±1.08	1039	3.56±1.36	2576
40	6.57±2.63	12796	6.85±2.43	56	5.49±1.75	947	5.12±2.25	1966
30	8.72±3.66	9340	9.09±2.98	71	7.19±2.50	642	6.58±3.19	1601
20	11.06±4.61	7216	12.03±3.89	26	9.22±3.50	398	8.35±3.95	1171
10	12.66±5.27	4582			10.16±3.30	369

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Table 3 UVI relative differences between ground-based and OMI over 4 sites

天气	当雄		沱沱河		拉萨		瓦里关
天气	相对差别/%	样本量	相对差别/%	样本量	相对差别/%	样本量	相对差别/%	样本量
总体	80.1±166.1	545	86.8±156.5	104	91.9±114.9	765	67.8±136.0	2045
云天	96.3±180.3	450	108.8±172.0	80	113.1±134.9	510	99.8±158.6	1327
晴天	8.6±5.4	95	13.3±27.3	24	49.6±23.3	255	8.7±29.0	718

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