聊城大气降水氢氧同位素特征及水汽来源分析

doi:10.16258/j.cnki.1674-5906.2022.03.013

生态环境学报 ›› 2022, Vol. 31 ›› Issue (3): 546-555.DOI: 10.16258/j.cnki.1674-5906.2022.03.013

聊城大气降水氢氧同位素特征及水汽来源分析

闫胜文¹(), 刘加珍¹^,^*(), 陈永金¹, 马笑丹¹, 张亚茹¹, 朱海勇²

1.聊城大学地理与环境学院,山东聊城 252059
2.青岛理工大学,山东青岛 266520

收稿日期:2021-05-18 出版日期:2022-03-18 发布日期:2022-05-25
通讯作者: *刘加珍（1974年生）,女,教授,博士,主要从事陆面生态过程研究。E-mail: liujiazhen@lcu.edu.cn
作者简介:闫胜文（1995年生）,男,硕士研究生,主要从事同位素水文学研究。E-mail: 1958214264@qq.com
基金资助:
国家自然科学基金项目(40901276);国家自然科学基金项目(40871239);聊城大学社科项目(321021916)

Moisture Sources and Characteristics of Stable Hydrogen and Oxygen Isotopes in Precipitation in Liaocheng

YAN Shengwen¹(), LIU Jiazhen¹^,^*(), CHEN Yongjin¹, MA Xiaodan¹, ZHANG Yaru¹, ZHU Haiyong²

1. College of Environment and Planning, Liaocheng University, Liaocheng 252059, P. R. China
2. Qingdao University of Technology, Qingdao, 266520, P. R. China

Received:2021-05-18 Online:2022-03-18 Published:2022-05-25

摘要/Abstract

摘要：

大气降水是水循环过程中不可缺少的环节之一,δ_(D)和δ_(18O)是示踪水真实动力过程的最理想的环境同位素,对揭示水汽输送来源与环境效应等有重要的指示意义。利用氢氧稳定同位素技术与HYSPLIT后向轨迹模型,分析了聊城地区2019年10月—2020年11月的大气降水中δ_(D)和δ_(18O)特征及变化规律,探讨了局地气象要素和水汽来源对降水稳定同位素的影响和大气降水稳定同位素反映出的环境效应。结果表明,聊城大气降水除与水汽来源、蒸发源区的气象条件有关外,还受雨滴在降落过程中的蒸发富集、当地的温度和湿度的影响。该地区全年大气降水线方程为：δ_(D)=(7.45±0.29) δ_(18O)+(4.20±2.41),斜率和截距均低于全球大气降水线方程。从季节来看,春、夏、秋3个季节的大气降水线斜率和截距均偏小,而冬季明显偏大。大气降水中δ_(D)和δ_(18O)贫富变化明显,11月至翌年4月为大气降水δ_(D)和δ_(18O)的富集期,这一时期过量氘月均值高于10‰（全球降水过量氘平均值）;5—10月为大气降水δ_(D)和δ_（18O）的贫化期,这一时期过量氘偏低,月均值低于10‰。降水δ_(D)和δ_(18O)在全年尺度和大气相对湿度较高的5—10月,都呈现反温度效应和降水量效应,而在大气相对湿度较低的11月至翌年4月呈现降水量效应。过量氘的变化和HYSPLIT气团轨迹表明聊城地区5—10月大气降水主要来源于东南季风和西南季风所携带的海洋水汽,11月至翌年4月大气降水主要来源于亚欧大陆内部水汽及局地的水汽再循环。

关键词: 大气降水, 氢氧同位素, 水汽来源, 过量氘, 后向轨迹, 聊城

Abstract:

Atmospheric precipitation is one of the indispensable links in the water cycle. δ_(D) and δ_(18O) are ideal environmental isotopes to trace the real hydrodynamic process, so it is of great significance to reveal the source of water vapor transport and environmental effects. Based on the stable hydrogen and oxygen isotope technology and the backward trajectory model (HYSPLIT), we measured the hydrogen-oxygen isotope composition of water samples in atmospheric precipitation in Liaocheng area from October 2019 to November 2020. We also analyzed the variation and characteristics of the hydrogen-oxygen isotope and discussed its influencing factors from local meteorological elements and water vapor sources and the environmental effects reflected by stable isotopes in atmospheric precipitation. The results showed that the atmospheric precipitation in Liaocheng was not only related to the source of water vapor and the meteorological conditions in the local area, but also affected by other factors, such as the evaporation of raindrops during the falling process, local temperature, and humidity. The local meteoric water line equation was δ_(D)=(7.45±0.29) δ_(18O)+(4.20±2.41), and both the slope and the intercept of the equation were lower than those of the global meteoric water line equation. In terms of seasons, the equation's slope and intercept of atmospheric precipitation line in spring, summer, and autumn were relatively smaller, but were evidently larger in winter. The isotopic depletion and enrichment of δ_(D) and δ_(18O) in atmospheric precipitation kept changing. The enriched period occurred from November to the following April, during which the monthly average value of D-excess was higher than 10‰ (the average of excess tritium in global precipitation). The diluted period of δ_(D) and δ_(18O) occurred from May to October when the monthly average value of D-excess was less than 10‰. Precipitation δ_(D) and δ_(18O) showed an inverse temperature effect and a precipitation effect from May to October when the annual scale and atmospheric related humidity were high, but only the precipitation effect occurred from November to April when the atmospheric relative humidity was low. According to D-excess and the HYSPLIT model, the atmospheric precipitation in Liaocheng area from May to October mainly came from the ocean water vapor carried by the southeast and southwest monsoon. From November to April of the following year, the precipitation mainly came from the water vapor in the Eurasian Continent and local water recycling.

Key words: meteoric water, hydrogen and oxygen stable isotopes, moisture source, d-excess, backward trajectory, Liaocheng

中图分类号:

P426.61
X16

闫胜文, 刘加珍, 陈永金, 马笑丹, 张亚茹, 朱海勇. 聊城大气降水氢氧同位素特征及水汽来源分析[J]. 生态环境学报, 2022, 31(3): 546-555.

YAN Shengwen, LIU Jiazhen, CHEN Yongjin, MA Xiaodan, ZHANG Yaru, ZHU Haiyong. Moisture Sources and Characteristics of Stable Hydrogen and Oxygen Isotopes in Precipitation in Liaocheng[J]. Ecology and Environment, 2022, 31(3): 546-555.

图/表 8

图1 研究区聊城的示意图

Figure 1 Location of Liaocheng

图2 聊城2019年10月—2020年11月降水量、气温的日变化

Figure 2 Daily variations of precipitation and temperature from October 2019 to November 2020 in Liaocheng

图3 聊城2019年10月—2020年11月大气降水δ（D）和δ（18O）的日变化

Figure 3 Daily variations of precipitation, δ(D) and δ(18O)from October 2019 to November 2020

图4 聊城大气降水线

Figure 4 Local meteoric water line in Liaocheng

图5 聊城大气降水Dexcess月平均值变化

Figure 5 Monthly average variations of excess deuterium in precipitation from October 2019 to November 2020

图6 聊城大气降水δ(D)、δ(18O)与温度（t）、降水量（P）的关系

Figure 6 Correlations between δ(D) and δ(18O) with temperature and precipitation in Liaocheng

图7 聊城不同季节典型降水事件气团后向轨迹红色、蓝色、绿色分别代表研究区地面上空1000、1500、2000 m高度上的气团轨迹

Figure 7 HYSPLIT back trajectory of air mass in typical precipitation events in Liaocheng Red, blue and green line represent air mass trajectory at 1000 m, 1500 m and 2000 m above the surface of the study area, respectively

图8 聊城大气相对湿度月平均值变化

Figure 8 Monthly average variations of relative humidity in Liaocheng

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聊城大气降水氢氧同位素特征及水汽来源分析

Moisture Sources and Characteristics of Stable Hydrogen and Oxygen Isotopes in Precipitation in Liaocheng

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