Surface water and aerosol spatiotemporal dynamics and influence mechanisms over drylands

Chen, Xiangyue; Zuo, Hongchao; Wang, Wenpeng; Duan, Jikai; Chang, Mingheng; Wang, Jingzhe

doi:10.1016/j.gsf.2022.101524

Cited by 4 publications

(2 citation statements)

References 64 publications

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“…The substantial reduction of the Aral Sea has transformed it into a primary source of dust storms carrying diverse pollutants, leading to a significant ecological crisis. A recent study indicates that approximately 54.37% of Central Asia's surface water faces the threat of recession and desiccation [37]. In addition, the demand for water in agriculture and large-scale irrigation systems typically relies on the ASB, where the population has tripled from 1960 to 2015 [38].…”

Section: Introductionmentioning

confidence: 99%

Monitoring Spatial–Temporal Variations in River Width in the Aral Sea Basin with Sentinel-2 Imagery

Zhou,

Ke,

Ding

et al. 2024

Remote Sensing

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Rivers in arid regions serve as crucial freshwater resources for local communities and play an essential role in global hydrological and biogeochemical cycles. The Aral Sea Basin (ASB) in Central Asia is characterized by an arid climate and river dynamics that are sensitive to climate change and human activities. Monitoring the spatiotemporal variations in river water extent in the ASB is essential to maintain an ecological balance and ensure water security. In this study, we extracted data regarding monthly river water bodies in the ASB from 2017 to 2022 by synthesizing monthly Sentinel-2 images. The water extents on the Sentinel images were automatically mapped using the Otsu method, and the river widths for all river channels were calculated using the RivWidth algorithm. We investigated the relationships between the river dynamics and the geomorphology, climatic change, human activities, and the annual and interannual variations in the river width in different reaches of the basin. The results show a seasonal variability in the river width, with most rivers reaching the largest width in the warm season and a few rivers in the middle and lower areas reaching the valley value in the warm season. Compared to their tributaries, the mainstem in the middle/lower regions showed less seasonal variability. According to interannual analysis, most of the rivers in the ASB significantly narrowed between 2017 and 2022, a phenomenon which is generally impacted by temperature and evapotranspiration variations. Comparisons show that our results provide improved information about the narrow river reaches and denser river networks compared to the previous global dataset, demonstrating the advantageous properties of high spatial resolution in Sentinel-2 imagery.

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Section: Introductionmentioning

confidence: 99%

Monitoring Spatial–Temporal Variations in River Width in the Aral Sea Basin with Sentinel-2 Imagery

Zhou,

Ke,

Ding

et al. 2024

Remote Sensing

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“…In the arid Central Asia region, thousands of small lakes are scattered over the irrigated area of the ASB [28], and they can experience strong intra-and interannual variations (i.e., seasonal and permanent) due to the vulnerability of the region to human activity and climate fluctuations. Recently, a study has suggested that nearly 54.367% of the surface water in Central Asia is at risk of receding and drying up [29]. Previous studies have made attempts to monitor lake area variations of inland water bodies of the ASB or Central Asia.…”

Section: Introductionmentioning

confidence: 99%

Monitoring Surface Water Area Changes in the Aral Sea Basin Using the Google Earth Engine Cloud Platform

Huang

Chen

et al. 2023

Water

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The surface water area and types in the Aral Sea Basin (ASB) have undergone extensive changes due to the impacts of climate change and anthropogenic activities. This study explores the changes in the surface water area in the ASB based on the Google Earth Engine cloud platform. Then, we integrate multi-source data to identify 1559 lakes and 196 reservoirs from the Joint Research Centre Global Surface Water (JRC GSW) dataset. Our results indicate that the lake area (34,999.61 km2) is about 10 times that of the reservoir area (3879.08 km2) in the ASB. The total area of surface water in the ASB decreased by 23,194.35 km2 or 34.58% from 1992 to 2020. Specifically, the areas of permanent water shrunk at a rate of 1278.6 km2/year, while the areas of seasonal water increased at a rate of 522.5 km2/year. The proportion of lakes and reservoirs in the total surface water has decreased from 79.33% (during 1992–2000) to 75.21% (during 2000–2010) to 63.94% (during 2010–2020). The water that should have flowed into the Aral Sea to maintain its permanent water may have been converted into two parts. Part of it might continue to be permanent water but show up in other regions, while part of it might convert to seasonal water (especially in the Aral Sea itself and the ASB plain area). Our study bridges the limitations of previous studies that have ignored seasonal water change and builds a water area list for 1755 lakes/reservoirs (≥0.1 km2) for the first time. The results can serve as important knowledge for water resource management and sustainable river basin development in ASB.

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Long-term dramatic spatial and temporal changes in the watershed areas of multiple types of lakes and reservoirs in Xinjiang, China

Wu,

Liu,

Zhang

et al. 2024

Ecological Indicators

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Surface water and aerosol spatiotemporal dynamics and influence mechanisms over drylands

Cited by 4 publications

References 64 publications

Monitoring Spatial–Temporal Variations in River Width in the Aral Sea Basin with Sentinel-2 Imagery

Monitoring Spatial–Temporal Variations in River Width in the Aral Sea Basin with Sentinel-2 Imagery

Monitoring Surface Water Area Changes in the Aral Sea Basin Using the Google Earth Engine Cloud Platform

Long-term dramatic spatial and temporal changes in the watershed areas of multiple types of lakes and reservoirs in Xinjiang, China

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