中国西北干旱地区雨夹雪事件的时空变异性

IF 2.7 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Zhiwei Yang, Rensheng Chen, Zhangwen Liu, Yanni Zhao, Yiwen Liu, Wentong Wu
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引用次数: 0

摘要

雪上降雨(ROS)事件涉及雪面降雨,ROS 事件的发生会加剧中国西北干旱地区(ARNC)的水资源短缺和生态系统脆弱性。本研究利用中国气象局国家气象信息中心提供的68个气象站的日积雪深度数据和日气象数据,研究了1978-2015年ARNC地区ROS事件的时空变异性,并探讨了这些事件的影响因素以及未来ARNC地区ROS事件的可能变化。结果表明,ARNC的ROS事件主要发生在10月至次年5月,主要分布在祁连山区、天山山区、伊犁河谷、塔城地区和阿勒泰地区,其中伊犁河谷、塔城市和阿勒泰山区发生的ROS事件最多。根据 ROS 事件的强度,ARNC 地区 ROS 事件导致洪水的风险最高的地区是天山山脉、伊犁河谷、塔城市和阿勒泰山脉。从1978年到2015年,阿勒泰地区降水日数和降水强度都有很大程度的增加,这主要是受气温和降水日数的影响。然而,由于阿勒泰地区ROS事件频繁发生的地区积雪丰富,积雪变化对ROS事件的影响较小,这只是一种暂时现象。此外,与其他因素相比,海拔对 ARNC 地区 ROS 事件的影响较小。在 ARNC,降雨开始时间和积雪结束时间从当年春季逐渐提前到前一年冬季,而降雨结束时间和积雪开始时间从秋季逐渐推迟到冬季。这可能会导致未来冬季出现更多的 ROS 事件。这些结果可为 ARNC 的水资源管理和减轻 ROS 事件造成的相关灾害提供可靠依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Spatiotemporal variability of rain-on-snow events in the arid region of Northwest China

Rain-on-snow (ROS) events involve rainfall on snow surfaces, and the occurrence of ROS events can exacerbate water scarcity and ecosystem vulnerability in the arid region of Northwest China (ARNC). In this study, using daily snow depth data and daily meteorological data from 68 meteorological stations provided by the China Meteorological Administration National Meteorological Information Centre, we investigated the spatiotemporal variability of ROS events in the ARNC from 1978 to 2015 and examined the factors affecting these events and possible changes of future ROS events in the ARNC. The results showed that ROS events in the ARNC mainly occurred from October to May of the following year and were largely distributed in the Qilian Mountains, Tianshan Mountains, Ili River Valley, Tacheng Prefecture, and Altay Prefecture, with the Ili River Valley, Tacheng City, and Altay Mountains exhibiting the most occurrences. Based on the intensity of ROS events, the areas with the highest risk of flooding resulting from ROS events in the ARNC were the Tianshan Mountains, Ili River Valley, Tacheng City, and Altay Mountains. The number and intensity of ROS events in the ARNC largely increased from 1978 to 2015, mainly influenced by air temperature and the number of rainfall days. However, due to the snowpack abundance in areas experiencing frequent ROS events in the ARNC, snowpack changes exerted slight impact on ROS events, which is a temporary phenomenon. Furthermore, elevation imposed lesser impact on ROS events in the ARNC than other factors. In the ARNC, the start time of rainfall and the end time of snowpack gradually advanced from the spring of the current year to the winter of the previous year, while the end time of rainfall and the start time of snowpack gradually delayed from autumn to winter. This may lead to more ROS events in winter in the future. These results could provide a sound basis for managing water resources and mitigating related disasters caused by ROS events in the ARNC.

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来源期刊
Journal of Arid Land
Journal of Arid Land ENVIRONMENTAL SCIENCES-
CiteScore
4.70
自引率
6.70%
发文量
768
审稿时长
3.2 months
期刊介绍: The Journal of Arid Land is an international peer-reviewed journal co-sponsored by Xinjiang Institute of Ecology and Geography, the Chinese Academy of Sciences and Science Press. It aims to meet the needs of researchers, students and practitioners in sustainable development and eco-environmental management, focusing on the arid and semi-arid lands in Central Asia and the world at large. The Journal covers such topics as the dynamics of natural resources (including water, soil and land, organism and climate), the security and sustainable development of natural resources, and the environment and the ecology in arid and semi-arid lands, especially in Central Asia. Coverage also includes interactions between the atmosphere, hydrosphere, biosphere, and lithosphere, and the relationship between these natural processes and human activities. Also discussed are patterns of geography, ecology and environment; ecological improvement and environmental protection; and regional responses and feedback mechanisms to global change. The Journal of Arid Land also presents reviews, brief communications, trends and book reviews of work on these topics.
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