TROPICAL GEOGRAPHY ›› 2016, Vol. 36 ›› Issue (6): 895-900.doi: 10.13284/j.cnki.rddl.002899

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Trends of Rainfall at Shantou and Their Relationships with Global Surface Temperature during 1880–2015

XIE Jianqun 1 ,OUYANG Yujie 1 ,CHEN Xiuyun 1 ,ZHAO Meixia 2 ,CHEN Tegu 2   

  1. (1.Shantou Meteorology Station,Shantou 515041,China;2.Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China)
  • Received:2016-09-27 Online:2016-11-05 Published:2016-11-05

Abstract:

In recent years, some investigations have been carried out to study the inter-decadal variability of precipitation in China. The earliest record of rainfall was from 1880 and a total of 127 years of complete records were taken for Shantou. This long precipitation sequence was very important for exploring the rainfall regime for the whole eastern region of Guangdong Province. The long-term changes in precipitation during a whole year, the pre-flood period (Apr.-Jun.), or the post-flood period (Jul.-Sep.), and their relationships with global surface temperature during 1880-2015 were analyzed using precipitation data from the Central Weather Bureau (for years of 1881-1943) and Shantou Meteorology Station (for years of 1951-2015) and global surface temperature data from HadCRUT 4 dataset. The methods of filtering analysis, linear regression analysis, spectral analysis and correlation analysis were adopted in this study. The following findings were highlighted: 1) The inter-annual and inter-decadal variations in precipitation during a whole year, the pre-flood period or the post-flood period were obvious during 1880-2015, and the primary periods for the annual precipitation sequence were 6, 8, 13, and 26 years during 1880-1938 and were 7, 8, 11 and 17 years during 1951-2015. There was no significant long-term increasing or decreasing tendency basing on this long precipitation sequence. For example, the precipitation during a whole year, the pre-flood period or the post-flood period fluctuated after treatment in filtering analysis. 2) The relationship between precipitation during a whole year, the pre-flood period or the post-flood period and global warming was complicated. There was a significant positive correlation between precipitation and global surface temperature during cold periods (1880-1939), especially in the pre-flood periods (Apr.-Jun.). There was no significant correlation between precipitation and global surface temperature during warm periods (1977-2015). But the variation magnitude of precipitation in the pre-flood period and the post-flood period increased with the increase of temperature, which suggested that the risk of drought or flood would increase accordingly. 3) According to the long-term changes in precipitation during a whole year, the pre-flood period or the post-flood period and the current precipitation evaluation standard adopted by the Guangdong Meteorology Administration, the frequency of normal precipitation in the pre-flood period would increase under the background of global warming, and the probability of less precipitation in the post-flood period would increase at the same time. These results were important for exploring the variation characters of precipitation for the eastern region of Guangdong over a long term period and useful for evaluating the possible effect of global warming on precipitation at Shantou in the near future.

Key words: rainfall, global warming, Meteorology, change trend, Shantou