Characteristics and abruption analysis on regional haze weather process over Guangdong Province during the recent 35years
LI Li-yun1, DENG Xue-jiao2, HE Qi-hua1, LI Fei2, DENG Tao2
1. Panyu Meteorological Service, Guangzhou 511400, China;
2. Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou 510080, China
With the daily visibility and relativity humidity data from 86meteorological stations across Guangdong province from 1980 to 2014, typical haze processes according to the region were diagnosed based on the definition of "regional haze process" and "single station haze process". Furthermore, the trends and characteristics of haze process were analyzed. Results showed that the haze processes over Guangdong province mainly occurred in the Pearl River Delta region (PRD) and in individual regions of northern and eastern Guangdong, especially the western area to Pearl River Estuary. The data revealed that "Regional haze process" was mostly characterized by visibility ranging from 5 to 10km and there was no case with visibility less than 2km. Haze weather processes mainly occurred from October to April with the peak time differing slightly. The haze processes mostly happened in winter (from December to January next year) over northern, eastern and western Guangdong, but in spring (from March to April next year) over PRD. The analysis of the abruption by virtue of the Mann-Kendall rank statistics and the moving-t test revealed that the increasing trends of haze weather process over the PRD since the 1980s were due to abrupt changes which took place in 1986 and reached the strongest between 2000 and 2008. The haze weather process over northern Guangdong also appeared abrupt increasing changes in the middle of 1990s, especially between 1991 and 2011. The annual mean series of haze process over western Guangdong was relatively stable before 2000, but increased significantly after 2004. Haze processes over eastern Guangdong showed no significant changes.
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LI Li-yun, DENG Xue-jiao, HE Qi-hua, LI Fei, DENG Tao. Characteristics and abruption analysis on regional haze weather process over Guangdong Province during the recent 35years. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(8): 2297-2303.
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