青藏高原湖泊水透明度的长期变化趋势及对极端气候事件的响应

IF 3.3 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Frontiers in Environmental Science Pub Date : 2024-09-18 DOI:10.3389/fenvs.2024.1450320
Wangming Liu, Huan Xu, Guowei He
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引用次数: 0

摘要

塞奇盘深度(Zsd)表示的水体透明度是评估水生环境质量的一个关键参数,它反映了光穿透水体的能力。青藏高原(TP)湖泊众多,但地处偏远,难以进入,遥感技术为在大空间尺度上监测 Zsd 提供了一种前景广阔的方法。在本研究中,我们使用基于半解析的 Zsd 算法研究了 2003 年至 2022 年期间高原湖泊水体透明度的时空动态。结果表明,173 个湖泊的 Zsd 长期平均值为 3.64±2.4 m,且近 20 年来总体呈显著上升变化趋势。在青藏高原中部地区,湖泊透明度与湖面温度呈正相关(r = 0.73),与降水量呈负相关(r = -0.54),凸显出该地区与其他地区相比对气象变化的敏感性更高。在 CTP 地区观察到的水透明度飙升可能与极端气候事件(即厄尔尼诺现象)导致的湖泊水动力变化有关。这些结果表明,在解释水透明度波动时,考虑区域气候因素非常重要。
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Long-term trends in water transparency of Tibetan Plateau lakes and the response to extreme climate events
Water transparency, as indicated by the Secchi disk depth (Zsd), is a key parameter for assessing the quality of aquatic environments, reflecting the ability of light to penetrate through the water column. In the Tibetan Plateau (TP), where lakes are abundant yet remote and challenging to access, remote sensing techniques offer a promising approach for monitoring Zsd over large spatial scales. In this study, we used the semianalytical -based Zsd algorithm to study the temporal and spatial dynamics of water transparency over TP during the period from 2003 to 2022. The results show that the 173 lakes have a mean value of Zsd is 3.64 ± 2.4 m for long term, and generally with the significantly increasing change trends in the past 20 years. In the central Tibetan Plateau (CTP) region, lake transparency showed a positive correlation with lake surface temperature (r = 0.73) and a negative correlation with precipitation (r = −0.54), highlighting the region’s heightened sensitivity to meteorological changes compared to other areas. The spike in water clarity observed in the CTP region may be linked to alterations in lake hydrodynamics driven by the extremely climate events (i.e., El Niño). These results indicated the importance of considering regional climatic factors when interpreting fluctuations in water transparency.
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来源期刊
Frontiers in Environmental Science
Frontiers in Environmental Science Environmental Science-General Environmental Science
CiteScore
4.50
自引率
8.70%
发文量
2276
审稿时长
12 weeks
期刊介绍: Our natural world is experiencing a state of rapid change unprecedented in the presence of humans. The changes affect virtually all physical, chemical and biological systems on Earth. The interaction of these systems leads to tipping points, feedbacks and amplification of effects. In virtually all cases, the causes of environmental change can be traced to human activity through either direct interventions as a consequence of pollution, or through global warming from greenhouse case emissions. Well-formulated and internationally-relevant policies to mitigate the change, or adapt to the consequences, that will ensure our ability to thrive in the coming decades are badly needed. Without proper understanding of the processes involved, and deep understanding of the likely impacts of bad decisions or inaction, the security of food, water and energy is a risk. Left unchecked shortages of these basic commodities will lead to migration, global geopolitical tension and conflict. This represents the major challenge of our time. We are the first generation to appreciate the problem and we will be judged in future by our ability to determine and take the action necessary. Appropriate knowledge of the condition of our natural world, appreciation of the changes occurring, and predictions of how the future will develop are requisite to the definition and implementation of solutions. Frontiers in Environmental Science publishes research at the cutting edge of knowledge of our natural world and its various intersections with society. It bridges between the identification and measurement of change, comprehension of the processes responsible, and the measures needed to reduce their impact. Its aim is to assist the formulation of policies, by offering sound scientific evidence on environmental science, that will lead to a more inhabitable and sustainable world for the generations to come.
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