典型厄尔尼诺期间台风降水δ18O变化分析: 以2018年22号台风“山竹”为例
杨云月(1995—), 女, 四川省宜宾市人, 硕士研究生, 主要从事自然地理学研究。E-mail: |
Copy editor: 姚衍桃
收稿日期: 2019-08-31
要求修回日期: 2019-10-28
网络出版日期: 2020-07-27
基金资助
国家自然科学基金项目(41672170)
福建省自然科学基金项目(2017J01654)
版权
Analysis on the variation of typhoon precipitation δ 18O during typical El Niño event: A case study of Typhoon Mangkhut (2018)
Received date: 2019-08-31
Request revised date: 2019-10-28
Online published: 2020-07-27
Supported by
Foundation item: National Natural Science Foundation of China(41672170)
Natural Science Foundation of Fujian Province(2017J01654)
Copyright
台风因其特殊的物理结构, 带来的降雨有别于一般的暴雨事件, 其降水稳定同位素组成与一般的大气降水事件也有较大的差异。本文根据2018年第22号台风“山竹”登陆前后广州、东莞两地气象资料和每小时间隔的降水样品收集, 分析了此次台风在两地的降水稳定同位素变化特征及其影响因素。台风“山竹”影响期间, 广州降水δ18O值变化范围为-5.7‰~-19.2‰, 变化幅度达13.5‰, 其平均值为-15.5‰; 东莞降水δ18O值变化范围为-7.3‰~-20.0‰, 变化幅度达12.7‰, 平均值为-14.8‰; 两地降水δ18O值均呈现为3个阶段倒U型的变化特征。受到蒸发作用的影响, 两地台风前端和尾端的降水氧同位素值相对偏正, 其中广州为-5.7‰~-9.3‰, 东莞为-7.3‰~-8.1‰。两地台风中端的降水稳定同位素值极端偏负, δ18O值变化范围分别为-16.0‰~-19.2‰(广州)和-13.0‰~-20.0‰(东莞), 是该地区迄今为止已报道的最为偏负的降水δ18O值。分析认为, 在厄尔尼诺状态下生成的远源台风“山竹”强度增强, 其内部具有更强的对流和水汽循环过程, 导致降水δ18O值极端偏负。
杨云月 , 许涛 , 罗翠榆 , 刘娟 , 姜修洋 . 典型厄尔尼诺期间台风降水δ18O变化分析: 以2018年22号台风“山竹”为例[J]. 热带海洋学报, 2020 , 39(4) : 34 -41 . DOI: 10.11978/2019081
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 Niño. Thus, the stronger convection and water-vapor circulation in Typhoon Mangkhut (2018) led to extreme negative δ 18O value of its precipitation.
表1 台风“山竹”与其他台风降水最负δ18O值的比较Tab. 1 Comparison of the most negative precipitation δ18O values of Typhoon Mangkhut (2018) and other typhoons |
年份 | 台风名称 | 最负δ18O值/‰ | 采样地点 |
---|---|---|---|
2018 | 山竹 | -19.2 | 广州 |
2018 | 山竹 | -20.0 | 东莞 |
2004 | 圆规 | -8.2 | 广州 |
2004 | 南川 | -13.1 | 广州 |
2007 | 帕布 | -14.1 | 广州 |
2007—2009 | -- | -17.7~-16.4 | 广州 |
2013—2017 | -- | -11.4~-17.9 | 福州 |
注: “--”表示多个台风。 |
图3 台风“山竹”降水δ2H和δ18O的线性关系GMWL为全球大气降水线方程(Global Meteoric Water Line), 由Craig(1961)提出 Fig. 3 Relationship between δ2H and δ18O in Typhoon Mangkhut (2018) precipitation. GMWL is the Global Meteoric Water Line proposed by Craig (1961) |
图4 台风“山竹”期间广州市的水汽轨迹该图基于国家测绘地理信息局标准地图服务网站下载的审图号为GS(2016)2950号的标准地图制作。图中红色、蓝色、绿色线条分别表示AGL500m、AGL1000m、AGL1500m的水汽轨迹 Fig. 4 Vapor transport trajectories in Guangzhou during Typhoon Mangkhut (2018). The red, blue, and green lines represent the water vapor trajectories of AGL500m, AGL1000m, and AGL1500m, respectively |
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