Guoqing Zhang

Guoqing Zhang
Chinese Academy of Sciences | CAS · Institute of Tibetan Plateau Research (CAS)

PhD

About

100
Publications
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Introduction
- Lake changes on the Tibetan Plateau from space; - Glacial lake changes and hazard assessment; - Lake changes in response to climate change; - Lake water balance

Publications

Publications (100)
Article
In this study, ICESat altimetry data are used to provide precise lake elevations of the Tibetan Plateau (TP) during the period of 2003–2009. Among the 261 lakes examined ICESat data are available on 111 lakes: 74 lakes with ICESat footprints for 4–7years and 37 lakes with footprints for 1–3years. This is the first time that precise lake elevation d...
Article
mass balance in the Inner Tibet Plateau (ITP) derived from the Gravity Recovery and Climate Experiment (GRACE) showed a positive rate that was attributed to the glacier mass gain, whereas glaciers in the region, from other field-based studies, showed an overall mass loss. In this study, we examine lake's water level and mass changes in the Tibetan...
Article
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No glacial lake census exists for the Third Pole region, which includes the Pamir-Hindu Kush-Karakoram-Himalayas and the Tibetan Plateau. Therefore, comprehensive information is lacking about the distribution of and changes in glacial lakes caused by current global warming conditions. In this study, the first glacial lake inventories for the Third...
Article
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The Tibetan Plateau (TP), the highest and largest plateau in the world, with complex and competing cryospheric-hydrologic-geodynamic processes, is particularly sensitive to anthropogenic warming. The quantitative water mass budget in the TP is poorly known. Here we examine annual changes in lake area, level, and volume during 1970s − 2015. We find...
Article
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Asia’s high plateaus are sensitive to climate change and have been experiencing rapid warming over the past few decades. We found 99 new lakes and extensive lake expansion on the Tibetan Plateau during the last four decades, 1970–2013, due to increased precipitation and cryospheric contributions to its water balance. This contrasts with disappearin...
Article
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The Hindu Kush–Karakoram–Himalayan system, named the Third Pole because it is the largest global store of frozen water after the polar regions, provides a reliable water supply to almost 2 billion people. Marked atmospheric warming has changed the balance of this so-called Asian water tower and altered water resources in downstream countries. In th...
Article
Third Pole natural cascade alpine lakes (NCALs) are exceptionally sensitive to climate change, yet the underlying cryosphere-hydrological processes and associated societal impacts are largely unknown. Here, with a state-of-the-art cryosphere-hydrology-lake-dam model, we quantified the notable high-mountain Hoh-Xil NCALs basin (including Lakes Zonag...
Article
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Meltwater from the cryosphere contributes a significant fraction of the freshwater resources in the countries receiving water from the Third Pole. Within the ESA-MOST Dragon 4 project, we ad-dressed in particular changes of glaciers and proglacial lakes and their interaction. In addition, we investigated rock glaciers in permafrost environments. He...
Article
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Lake systems on the Tibetan Plateau (TP) are important for the supply and storage of fresh water to billions of people. However, previous studies on the dynamics of these lakes focused on monitoring on multi-year scales and therefore lack sufficient temporal information. Here we present a new dataset comprising annual maps of big lakes (>10 km ² )...
Article
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Accurate estimates of regional ice thickness, which are generally produced by ice-thickness inversion models, are crucial for assessments of available freshwater resources and sea level rise. A digital elevation model (DEM) derived from surface topography of glaciers is a primary data source for such models. However, the scarce in situ measurements...
Article
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Weather station observations reveal that the Tibetan Plateau climate has been becoming warmer and wetter since the 1950s. However, the weather stations are dominantly located in the eastern plateau. The widespread and dense distribution of lakes over the Tibetan Plateau with negligible direct human influence can act as sentinels of climate change....
Article
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Against the background of climate change-induced glacier melting, numerous glacial lakes are formed across high mountain areas worldwide. Existing glacial lake inventories, chiefly created using Landsat satellite imagery, mainly relate to 1990 onwards and relatively long (decadal) temporal scales. Moreover, there is a lack of robust information on...
Article
The large number of lakes, little influenced by humans, on the Tibetan Plateau, form a natural laboratory for exploring cryosphere-hydrosphere-atmosphere processes under global warming. The water levels of these alpine lakes respond directly to water balance, but are mainly known only on the interannual scale. Seasonal variations are still poorly d...
Article
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青藏高原湖泊数量多、分布广、所占面积大,是亚洲水塔的重要组成部分,其受到人类活动的干扰较少,是理解高原生态环境变化机理的钥匙。青藏高原湖泊是气候变化敏感的指示器,在全球快速变暖背景下其对气候变化的响应如何?本研究基于多源遥感数据监测结果,系统地总结了青藏高原湖泊(大于1 km2) 在过去近50年(1976−2018年) 的面积、水位与水量变化等方面的研究进展。主要结论如下:1) 青藏高原湖泊总数量从1970s的1080个增加到2018年的1424个(+32%),湖泊总面积从4万km2扩张到5万km2 +25%),湖泊平均水位上升了约4 m,湖泊水储量增加了近1700亿吨;2) 时间上,湖泊面积、水位和水量变化在1970s−1995年略有下降,随后呈快速但非线性增加的态势;空间上,中-北部湖泊...
Article
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Lakes can be effective indicators of climate change, and this is especially so for the lakes over the Qinghai–Tibet Plateau (QTP), the highest plateau in the world, which undergoes little direct human influence. The QTP has warmed at twice the mean global rate, and the lakes there respond rapidly to climate and cryosphere changes. The QTP has ∼ 120...
Preprint
Full-text available
Accurate estimates of regional ice thickness, which are generally produced by ice-thickness inversion models, are crucial for assessments of available freshwater resources and sea level rise. Digital elevation model (DEM) derived surface topography of glaciers is a primary data source for such models. However, the scarce in-situ measurements of gla...
Article
Full-text available
Warming on Earth’s Third Pole is leading to rapid loss of ice and the formation and expansion of glacial lakes, posing a severe threat to downstream communities. Here we provide a holistic assessment of past evolution, present state and modelled future change of glacial lakes and related glacial lake outburst flood (GLOF) risk across the Third Pole...
Conference Paper
Widespread retreat of glaciers has accelerated over recent decades in most mountain regions as a consequence of global warming, leading to rapid expansion of glacial lakes, bringing related risks.When water is suddenly released, Glacial Lake Outburst Floods (GLOFs) can devastate lives and livelihoods up to hundreds of kilometres downstream of their...
Article
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Precipitation on the Tibetan Plateau (TP) exert great impacts on the energy, water cycle, and regional ecosystem. But due to the wide differences in climate regimes and complicated topography, TP precipitation is characterized as greater spatial diversity and lower confidence of temporal tendency. Based on the precipitation datasets from in‐situ ob...
Article
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Variations in glacier meltwater in the source regions of the Tibetan Plateau’s (TP) largest lake (Selin Co) and China’s longest river (Yangtze River) regulate the local and downstream water balance under the warming climate. However, the magnitude of their variations over the past four decades is still unknown. Here, we examine long-term changes in...
Article
Volume changes and water balances of the lakes on the Tibetan Plateau (TP) are spatially heterogeneous and the lakebasin scale drivers remain unclear. In this study, we comprehensively estimated water volume changes for 1132 lakes larger than 1 km2 and determined the glacier contribution to lake volume change at basin-wide scale using satellite ste...
Article
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Ongoing recession of glaciers in the Himalaya in response to global climate change has far-reaching impacts on the formation and expansion of glacial lakes. The subsequent glacial lake outburst floods (GLOFs) are a significant threat to lives and livelihoods as they can cause catastrophic damage up to hundreds of kilometres downstream. Previous stu...
Article
Enhanced scaling effects significantly lower the ability of MODIS normalized difference snow index to estimate fractional and binary snow cover on Abstract MODIS fractional (FSC) and binary (BSC) snow-cover data are important for obtaining accurate spatiotemporal snow-cover information for the Tibetan Plateau (TP) where rapid warming is closely rel...
Article
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Changes in the surface area of lakes can indicate climate change and human activity, and there are few reports on the characteristics of such changes in North Xinjiang, China. The normalized difference water index (NDWI) was modified by using the middle infrared band (MIR) instead of the near infra-red band (NIR). The modified NDWI (MNDWI) can effe...
Article
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Water transparency, usually denoted by Secchi disk depth (SSD), represents the first-order description of water quality and has important implications for the diversity and productivity of aquatic life. In China, lakes supply freshwater and ecosystem services to nearly a billion people. Therefore, real time monitoring of lake transparency is of gre...
Article
The long-term evolution of lakes on the Tibetan Plateau (TP) could be observed from Landsat series of satellite data since the 1970s. However, the seasonal cycles of lakes on the TP have received little attention due to high cloud contamination of the commonly-used optical images. In this study, for the first time, the seasonal cycle of lakes on th...
Article
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Plain Language Summary The Tibetan Plateau contains many lakes that are changing in depth and size due to the climate warming that has been particularly rapid in this region. Because of the lack of water level gauges in this remote area, satellites provide the only practical tool of monitoring these lakes' changes. A new altimetry satellite, Ice, C...
Article
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28 The lake area in the Inner Mongolian Plateau (IMP) has experienced a rapid reduction in 29 recent decades. Previous studies have highlighted the important role of intensive human 30 activities in IMP lake shrinkage. However, this study found that climate change-induced 31 summer precipitation variations can exert great influences on the IMP lake...
Article
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In the published article [1], the authors realized some errors in the affiliation and email address of Yang Hong, and thus wish to make the following revisions: Add the Affiliation 5 “School of Civil Engineering and Environmental Science, University of Oklahoma, Norman, OK 73019, USA” for Yang Hong Change the email address of Yang Hong to yanghong@...
Article
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青藏高原的湖泊面积超过我国湖泊总面积的 50% 以上,是“亚洲水塔”的重要组成部分。20 世纪 70 年代—2018 年,湖泊数量和面积均出现明显增长,但变化速率并不均一。1990年之前,低温抑制冰川融水导致湖泊水量出现负平衡。1990—2000 年,温度升高使得冰川融水和湖泊水量增加。2000 年以后,降水是导致湖泊水量增加的主要因素,但 2005—2013 年的连续气温上升,使得蒸发加强并削弱了湖泊水量增加的速率。在青藏高原中西部和西北部地区,2000—2013 年的湖泊水量增加则更多是受冰川融水的主要影响。20 世纪 70 年代—2013 年,青藏高原湖泊水量变化的空间特征与西风和印度季风区降水变化趋势一致。气温上升和增加的长波辐射使得湖泊水温明显增加,并促进了食物链的传输效率。随着湖...
Article
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As the first satellite altimetry mission operating in sar (delay-Doppler) mode, CryoSat-2 is an interesting mission to analyze its performance for water level monitoring over inland water bodies. It offers the opportunity to make comparison of sar and conventional altimeters by a multi-mode altimeter mounted on the same platform with a long repeat...
Article
Lakes on the Tibetan Plateau (TP) are an indicator and sentinel of climatic changes. We extended lake area changes on the TP from 2010 to 2018, and provided a long and dense lake observations between the 1970s and 2018. We found that the number of lakes, with area larger than 1 km2, has increased to ~1400 in 2018 from ~1000 in the 1970s. The total...
Article
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The availability of lake bathymetry maps is imperative for estimating lake water volumes and their variability, which is a sensitive indicator of climate. It is difficult, if not impossible, to obtain bathymetric measurements from all of the thousands of lakes across the globe due to costly labor and/or harsh topographic regions. In this study, we...
Article
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Lake surface water temperature (LSWT) is of vital importance for hydrological and meteorological studies. The LSWT ground measurements in the Tibetan Plateau (TP) were quite scarce because of its harsh environment. Thermal infrared remote sensing is a reliable way to calculate historical LSWT. In this study, we present the first and longest 35-year...
Article
The continuous rise in summer temperature and consequent glacier wastage have led to a significant loss of frozen water resources in the mountain headwaters of the major river systems in Central Asia. High mountain lakes in the headwaters of the Syr Darya River serve as sensitive indicators of climate change in the region. In this study, lakes in t...
Article
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Glacial lake outburst floods (GLOFs) are a major concern in the Himalaya and on the Tibetan Plateau (TP), where several disasters occurring over the past century have caused significant loss of life and damage to infrastructure. This study responds directly to the needs of local authorities to provide guidance on the most dangerous glacial lakes ac...
Article
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Despite previous studies, glacier-lake interactions and future lake development in the Poiqu River basin,central Himalaya, are still not well understood. We mapped glacial lakes, glacier outlines, their frontal positions and ice flow from optical remote sensing data, and calculated glacier surface elevation change from digital terrain models. Durin...
Article
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Lake level change in the Tibetan Plateau is an important indicator for regional and global climate changes. We use altimeter data from Cryosat-2, SARAL, ICESat, and Jason-2 to detect lake level changes at different spatial and temporal resolutions over 2003-2017 (Jason-3 data in 2017 for validation). Cryosat-2's SARIn mode provides precise water le...
Article
Lakes are sensitive indicators of anthropogenic climate change and also respond to direct human activities. Yet, long-term lake inventories and quantitative evaluation of the factors driving observed lake changes across China remain elusive. Here, for the first time, we examined multi-decadal lake area changes in China during 1960s-2015, using hist...
Article
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Glaciers in the Himalaya are increasingly retreating and thinning due to climate change. This process is the primary cause of glacial lakes expansion and has increased the possibilities of the glacial lake outburst floods (GLOFs) that have been responsible for heavy loss of life and damage to downstream infrastructures. This study examines the stat...
Article
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Lake ice is a robust indicator of climate change. The availability of information contained in Moderate Resolution Imaging Spectroradiometer (MODIS) daily snow products from 2000 to 2017 could be greatly improved after cloud removal by gap filling. Thresholds based on open water pixel numbers are used to extract the freeze‐up start and break‐up end...
Chapter
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The cryosphere is defined by the presence of frozen water in its many forms: glaciers, ice caps, ice sheets, snow, permafrost, and river and lake ice. In the extended Hindu Kush Himalaya (HKH) region, including the Pamirs, Tien Shan and Alatua, the cryosphere is a key freshwater resource, playing a vital and significant role in local and regional h...
Article
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Himalayan glaciers, in general, are shrinking and glacial lakes are evolving and growing rapidly in number and size as a result of climate change. This study presents the latest remote sensing-based inventory (2017) of glacial lakes (size ≥0.0036 km2) across the Nepal Himalaya using optical satellite data. Furthermore, this study traces the decadal...
Article
Water surface elevation (WSE) is an essential quantity for water resource monitoring and hydrodynamic mod-eling. Satellite altimetry has provided data for inland water bodies. The height that is derived from altimetry measurement is ellipsoidal height. In order to convert the ellipsoidal height to orthometric height, which has physical meaning, acc...
Article
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Debris-covered glaciers are common in the Himalayas and play a key role in understanding future regional water availability and management. Previous studies of regional glacial changes have often neglected debris-covered glaciers or have mixed them with debris-free glaciers. In this study, we generated a new glacier data set that include debris-cov...
Article
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The air temperature lapse rate (TLR) is a key parameter for interpolating air temperature data in high mountainous regions such as the Tibetan Plateau (TP). The Moderate Resolution Imaging Spectroradiometer (MODIS) land surface temperature (LST) has been frequently used for estimating air temperature during the past decade, but its performance in e...