Characterizing extreme drought and wetness in Guangdong, China using global navigation satellite system and precipitation data

Zhu，Hai1; Chen，Kejie1; Chai，Haishan1; Ye，Yuanbin2; Liu，Wenjian2

2024-12-01

10.1186/s43020-023-00121-6

Satellite Navigation   影响因子和分区

2662-9291

2662-1363

As global temperature rises, the frequency of extreme climate events, e.g., severe droughts and floods, has increased significantly and caused severe damage over the past years. To this regard, precipitation efficiency, a crucial meteorological parameter, could provide valuable insights for a better understanding of the patterns and characteristics of these extreme events. In this study, taking Guangdong province as an exemplary region, we first obtained long-term and high-resolution historical records of precipitation efficiency by integrating the observations from a dense network of Global Navigation Satellite System (GNSS) stations with precipitation data, and then characterized the extreme drought and wetness through climate indices. We found a distinct seasonal trend in precipitation efficiency in Guangdong, with annual fluctuations ranging from 10 to 25%. Notably, precipitation efficiency is higher in proximity to the Pearl River Delta Plain and gradually decreases towards the east and west. The occurrence of anomalous peaks and valleys in precipitation efficiency generally corresponds to dry and wet conditions, respectively. A total of 9 extreme wet events and 6 dry events occurred from January 2007 to May 2022, with durations from 3 to 6 months. Our results also demonstrated that both wet and dry frequencies exhibit an increasing trend with the expansion of the time scale, and the frequency of extreme events near the Pearl River Delta Plain surpasses that of other regions. Furthermore, the propagation time from meteorological anomalies to agricultural and hydrological anomalies is about 3 months. The periodic characteristics of meteorological anomalies are identified as the primary driver for other anomalous periodic patterns. Our work unveils the long-term dynamic behavior of precipitation efficiency, as well as the characteristics of extreme drought and wetness events in the regions characterized by intricate land–atmosphere interactions.

Extreme drought and wetness GNSS Precipitation efficiency

SCI

英语

第一 ; 通讯

2-s2.0-85180853409

Scopus

1.Department of Earth and Space Sciences,Southern University of Science and Technology,Shenzhen,518055,China
2.Lands and Resource Department of Guangdong Province,Surveying and Mapping Institute,Guangzhou,510500,China

Zhu，Hai,Chen，Kejie,Chai，Haishan,et al. Characterizing extreme drought and wetness in Guangdong, China using global navigation satellite system and precipitation data[J]. Satellite Navigation,2024,5(1).

Zhu，Hai,Chen，Kejie,Chai，Haishan,Ye，Yuanbin,&Liu，Wenjian.(2024).Characterizing extreme drought and wetness in Guangdong, China using global navigation satellite system and precipitation data.Satellite Navigation,5(1).

Zhu，Hai,et al."Characterizing extreme drought and wetness in Guangdong, China using global navigation satellite system and precipitation data".Satellite Navigation 5.1(2024).