Journal of Tropical Oceanography ›› 2020, Vol. 39 ›› Issue (4): 34-41.doi: 10.11978/2019081CSTR: 32234.14.2019081

• Marine Meteorology • Previous Articles     Next Articles

Analysis on the variation of typhoon precipitation δ 18O during typical El Niño event: A case study of Typhoon Mangkhut (2018)

Yunyue YANG1(), Tao XU1, Cuiyu LUO1, Juan LIU3, Xiuyang JIANG1,2()   

  1. 1. School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China
    2. Institute of Geography, Fujian Normal University, Fuzhou 350007, China
    3. Institute of Environmental Research at Greater Bay, Guangzhou University, Guangzhou 511400, China
  • Received:2019-08-31 Revised:2019-10-28 Online:2020-07-20 Published:2020-07-27
  • Contact: Xiuyang JIANG E-mail:yyunyue_1995@126.com;xyjiang@fjnu.edu.cn
  • Supported by:
    Foundation item: National Natural Science Foundation of China(41672170);Natural Science Foundation of Fujian Province(2017J01654)

Abstract:

The rainfall caused by typhoon is different from the other precipitation event due to its unique physical structure. The stable isotope composition of typhoon precipitation is also quite different from that of a general precipitation event. Based on meteorological data before and after the landing of Typhoon Mangkhut (2018) in Guangzhou and Dongguan and stable isotope data of precipitation at hourly resolution, we analyzed the characteristics of the stable isotope variation of the typhoon precipitation and its influencing factors. During the influence of Typhoon Mangkhut, the δ18O value of precipitation in Guangzhou ranged from -5.7‰~-19.2‰, with a variation of 13.5‰; and the average value was -15.5‰. The variation of δ18O value in Dongguan was -7.3‰~-20.0‰, with a variation of 12.7‰; and the average was -14.8‰. The variations of δ18O value of precipitation in the two places both showed the three-stage variation characteristics of inverted U-shape. Due to the influence of evaporation, the precipitation oxygen isotope values in the typhoon at the front and back were relatively positive in two places, of which Guangzhou was (-5.7‰~-9.3‰, and Dongguan was -7.3‰~-8.1‰. The stable isotope values of precipitation in the typhoon central area of the two places were extremely negative, ranging from -16.0‰ to -19.2‰ (Guangzhou) and from -13.0‰ to -20.0‰ (Dongguan), which were the most negative precipitation δ18O values reported in this region so far. According to the analysis, the generated distant typhoon intensity was enhanced during the El Ni?o. Thus, the stronger convection and water-vapor circulation in Typhoon Mangkhut (2018) led to extreme negative δ 18O value of its precipitation.

Key words: Typhoon Mangkhut (2018), δ18O value of precipitation, microphysical process, El Ni?o

CLC Number: 

  • P732.3