EVALUATION LIGHT POLLUTION USING TIME-SERIES OF DMSP/OLS NIGHTTIME SATELLITE DATA DURING THE PAST 21 YEARS IN CHINA

摘要

The rapid urbanization process and economy development inevitably brings the light pollution, it has become a widespread attention of the world's environmental issue. In order to reveal the spatiotemporal patterns of light pollution in china, Defense Meteorological Satellite Program Operational Linescan System(DMSL/OLS) imageries from 1992 to 2012 were selected and then these imageries are corrected to ensure the consistency. Furthermore, we employed the slope of the linear regression and nighttime light index methods to demonstrate the china's light pollution characteristic across national, partition and provincial scales respectively. We found that: (1) China's light pollution expanded significantly around provincial capital city during the past 21 years and hot-spots of china light pollution focused in eastern coastal region. Yangtze River Delta, Pearl River Delta and Beijing-Tianjin-Hebei region have formed light pollution stretch regions respectively. In addition, some urban cities in the north of Shanxi, the south of Inner Mongolia and Xinjiang showed the decreasing light pollution significantly.(2) China's light pollution main focused in north china (NC) and east china (EC) and the total nighttime light (TNL)of these two regions accounts for over 50% of the whole country. The fastest growth of light pollution was observed in the northwest china (NWC), followed by the southwest of china (SWC). The growth rate of east china (EC), middle china (MC) and northeast china (NEC) was stable, while that of north china (NC) and south china (SC) declined. (3)Light pollution at provincial scale mainly located in Shandong, Guangdong and Hebei province, and the fastest growth of light pollution was Tibet and Hainan provinces. However, light pollution lever in the developed provinces (Hongkong, Macao, Shanghai and Tianjin) were higher than that of undeveloped provinces. Similarly, the light pollution heterogeneities of Taiwan, Beijing and Shanghai were higher than that of western undeveloped provinces. This conclusion could support government agencies to take effective measures to deal with light pollution environment issue.