The Variation of Relative Humidity in the East of Chinese Mainland and Its Association with Sea-Land Thermal Contrast

QI Qinghua; CAI Rongshuo

doi:10.7522/j.issn.1000-0534.2017.00018

Plateau Meteorology >

2017 , Vol. 36 >Issue 6: 1587 - 1594

DOI: https://doi.org/10.7522/j.issn.1000-0534.2017.00018

The Variation of Relative Humidity in the East of Chinese Mainland and Its Association with Sea-Land Thermal Contrast

QI Qinghua ,
CAI Rongshuo

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Key Laboratory of Global Change and Marine-Atmospheric Chemistry, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, Fujian, China

Received date: 2016-11-23

Online published: 2017-12-28

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Abstract

Relative humidity is one of the most key environmental meteorological parameters for the formation and transformation of the fog and haze, and it can impact the atmosphere visibility. Sea-land thermal contrast is the important climatic background for the fog and haze weather in the eastern and coastal China. Considering the geographical environment and the sea-land temperature difference in the east of Chinese mainland, the multi-scale spatio-temporal variations of the relative humidity (RH) and the associated thermodynamic causes and mechanisms were tentatively analyzed from the perspective of changes in atmospheric circulation, water vapor transport and the precipitation. The results show that the sea-land thermal contrast mainly formed in the south area of Yangtze river and the east sea area of Kuroshio (mainly include the Kuroshio at source area and in East China Sea) in recent 50 years. Thus the sea-land temperature deference (SLTD) indicator was built by the subtraction of averaged temperature between the two areas. And this zonal sea-land thermal contrast was subject to an obvious long-term increasing trend superposed by distinct interannual (quasi-4a and quasi-7a) and interdecadal (about 17a) changes. The correlation analysis indicated that the SLTD had a close relationship with the RH anomalies in the band areas that including the middle reaches of Yangtze river, the Huanghuai area, the North China and the coastal zones east of it (negative correlation area) and the South China (positive correlation area). Regression analysis found that the weakened (enhancement) of the zonal sea-land thermal contrast in winter mainly results in the southwest (northeast) anomalies of the monsoon circulation, which tends to regulate the water vapor transport from the eastern bay of Bengal and the South China Sea (the east China seas) to the east of Chinese mainland, and then it can impact the changes of RH at above areas through the restricttion in the form of water vapor transportation and precipitation. In addition, the strengthening of the SLTD was likely to cause the RH decrease in the North China, while significantly increase in the South China, and vice versa. The analysis above is attempted to provide an important scientific basis for figuring out the RH variation and its relationship with the occurrence of the fog and haze in the hotspot areas as well as the evolution in the future, which is very significant to the scientific adaptation to the climate and environment changes in development areas in the eastern China.

Key words： Relative humidity; sea-land temperature; environmental meteor; the east of China; fog and haze

Cite this article

QI Qinghua , CAI Rongshuo . The Variation of Relative Humidity in the East of Chinese Mainland and Its Association with Sea-Land Thermal Contrast[J]. Plateau Meteorology, 2017 , 36(6) : 1587 -1594 . DOI: 10.7522/j.issn.1000-0534.2017.00018

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