Guoxiong Zheng

Guoxiong Zheng
Chinese Academy of Sciences | CAS

PhD. Cryospheric sciences

About

44
Publications
15,609
Reads
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731
Citations
Introduction
Cryospheric changes and related disasters with special focuses on glacial lake evolution, GLOF hazard and risk assessment, and historic GLOF event reconstruction on the Third Pole.
Additional affiliations
August 2016 - July 2017
Chinese Academy of Sciences
Position
  • Research Assistant
July 2015 - August 2016
Esri China Information Technology Co. Ltd
Position
  • Software Engineer
May 2014 - July 2015
Chinese Academy of Sciences
Position
  • Research Assistant
Education
February 2019 - February 2021
University of Geneva
Field of study
  • Cryosphere Remote Sensing
July 2017 - December 2021
University of Chinese Academy of Sciences
Field of study
  • Cartography and Geographic Information System
September 2013 - July 2015
Liaoning Technical University
Field of study
  • Ecological Remote Sensing

Publications

Publications (44)
Article
Full-text available
Glaciers are highly sensitive to climate change and are undergoing significant changes in mid-latitudes. In this study, we analyzed the spatiotemporal changes of typical glaciers and their responses to climate change in the period of 1990–2015 in 4 different mountainous sub-regions in Xinjiang Uygur Autonomous Region of Northwest China: the Bogda P...
Article
Soil moisture (SM) and vapor pressure deficit (VPD) are key factors affecting photosynthesis, and quantifying their effects on this process can help us to understand the mechanisms of carbon cycling in terrestrial ecosystems. However, the strong coupling of SM and VPD makes it difficult to quantify their relative importance in the ecosystem carbon...
Article
The increasing frequency and intensity of droughts in a warming climate are likely to exacerbate adverse impacts on ecosystems, especially for water-limited regions such as Central Asia. A quantitative understanding of the impacts of drought on vegetation is required for drought preparedness and mitigation. Using the Global Inventory Modeling and M...
Article
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. 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
The dramatic climate change has far-reaching impacts on vegetation in drylands such as Central Asia. Recent attempts to assess vegetation stability to short-term climate variability often account solely for vegetation sensitivity or resilience but ignore the composite effects of these two indicators. Meanwhile, our understanding of the vegetation s...
Article
Understanding of future changes in drought characteristics is crucial for climate change adaptation and drought impact mitigation. We analyzed the projected changes in drought characteristics relative to historical drought conditions in Central Asia using the Standardized Precipitation Evapotranspiration Index (SPEI) based on both gridded observati...
Article
Full-text available
The CO2 efflux from forest soil (FCO2) is one of the largest components of the global carbon cycle. Accurate estimation of FCO2 can help us better understand the carbon cycle in forested areas and precisely predict future climate change. However, the scarcity of field-measured FCO2 data in the subtropical forested area greatly limits our understand...
Article
Full-text available
Land degradation poses a critical threat to the stability and security of ecosystems, especially in salinized areas. Monitoring the land degradation of salinized areas facilitates land management and ecological restoration. In this research, we integrated the salinization index (SI), albedo, normalized difference vegetation index (NDVI) and land su...
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
We analyze and reconstruct a recent glacial lake outburst flood (GLOF) process chain on 26 June 2020, involving the moraine-dammed proglacial lake – Jinwuco (30.356∘ N, 93.631∘ E) in eastern Nyainqentanglha, Tibet, China. Satellite images reveal that from 1965 to 2020, the surface area of Jinwuco has expanded by 0.2 km2 (+56 %) to 0.56 km2 and subs...
Conference Paper
Full-text available
Glacial Lake Outburst Floods (GLOFs) are amongst the most common and high-magnitude natural hydrological disasters in high-mountain regions that have resulted in severe casualties and socioeconomic losses over the last century. Here, we integrate various data and methods to analyse and reconstruct the GLOF process chain involving the moraine-dammed...
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
Full-text available
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
Full-text available
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...
Preprint
Full-text available
We analyze and reconstruct a recent Glacial Lake Outburst Flood (GLOF) process chain on 26 June 2020, involving the moraine-dammed proglacial lake Jinwuco (30.356°N, 93.631°E) in eastern Nyainqentanglha, Tibet, China. Satellite images reveal that from 1965 to 2020, the surface area of Jinwuco has expanded by 0.2 km2 (+56%) to 0.56 km2, and subseque...
Article
Full-text available
The “Third Pole” usually refers to the Tibetan Plateau and surroundings as it is the largest glaciated zone on Earth after the Antarctic and Arctic. It is also one of the major hotspots in the world suffering from widespread and severe glacial lake outburst flood (GLOF) hazard. GLOFs have often initiated following the sudden release of lake water d...
Article
Precipitation outputs from 30 Global Circulation Models (GCMs) of the Coupled Model Inter-comparison Project Phase 6 (CMIP6) were evaluated from 1951 to 2014 over six climate zones in arid Central Asia (ACA) using the Climate Research Unit TS 4.04 (CRU) precipitation datasets as reference. An evaluation framework was constructed taking into account...
Article
Water scarcity constitutes an important challenge faced by croplands in the Aral Sea basin (ASB). The croplands in the ASB are highly vulnerable to water stress and land degradation and experience high anthropogenic disturbances. This study investigated the spatiotemporal patterns of water stress and land degradation and detected the years with abr...
Article
Full-text available
Examining the drivers of landscape ecological risk can provide scientific information for planning and landscape optimization. The landscapes of the Amu Darya Delta (ADD) have recently undergone great changes, leading to increases in landscape ecological risks. However, the relationships between landscape ecological risk and its driving factors are...
Article
Quantitative assessment and long-term analysis of ecological vulnerability (EVI) are greatly important for understanding the dynamics of regional ecological environment and guiding ecological environmental protection and restoration. However, in the previous studies, there was rare assessment for ecological vulnerability of the special area of a tr...
Article
The shrinking of the Aral Sea is one of the most shocking environmental disasters in the world. The Amudarya River delta (AD) is highly vulnerable to land degradation. In this research, NDVI and albedo, which represent vegetation and soil conditions, were applied in change vector analysis (CVA) to monitor land degradation. The vegetation degradatio...
Article
The Scaled Drought Condition Index (SDCI) is an agricultural drought index derived from multiple remote sensing datasets including precipitation from the Tropical Rainfall Measurement Mission (TRMM) and temperature and vegetation index from the Moderate Resolution Imaging Spectroradiometer (MODIS). The SDCI can be used for large-scale drought monit...
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
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
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
Full-text available
Non-photosynthetic vegetation (NPV) is widely distributed in the arid and semi-arid area, especially in the sandy areas. The hyperspectral-based cellulose absorption index (CAI) is an accepted method for estimating the cover fractions of NPV. However, the spaceborne hyperspectral data currently avail- able to us are very limited. In this study, we...
Article
In Central Asia, desertification risk is one of the main environmental and socioeconomic issues; thus, monitoring land sensitivity to desertification is an extremely urgent issue. In this study, the combination of convergence patterns and desertification risk is advanced from a technical perspective. Furthermore, the environmentally sensitive area...
Article
In recent decades, climate change and human activities have severely affected grasslands in Central Asia. Grassland regulation and sustainability in this region require an accurate assessment of the effects of these two factors on grasslands. Based on the abrupt change analysis, linear regression analysis and net primary productivity (NPP), the spa...
Article
Full-text available
The unique climate and topography of the Tibetan Plateau produce an abundant distribution of lakes. These lakes are important indicators of climate change, and changes in lake area have critical implications for water resources and ecological conditions. Lake area change can be monitored using the huge sets of high-resolution remote sensing data av...
Article
Full-text available
The unique climate and topography of the Tibetan Plateau produce an abundant distribution of lakes. These lakes are important indicators of climate change, and changes in lake area have critical implications for water resources and ecological conditions. Lake area change can be monitored using the huge sets of high-resolution remote sensing data av...
Article
Lake area derived from remote sensing data is a primary data source, because changes in lake number and area are sensitive indicators of climate change. These indicators are especially useful when the climate change is not convoluted with a signal from direct anthropogenic activities. The data used for lake-area mapping is important, to avoid intro...
Article
Full-text available
Photosynthetic vegetation (PV) and non-photosynthetic vegetation (NPV) are important ground cover types for desertification monitoring and land management. Hyperspectral remote sensing has been proven effective for separating NPV from bare soil, but few studies determined fractional cover of PV (f pv) and NPV (f npv) using multispectral information...
Article
Full-text available
Analysis of spectral mixing mechanism of photosynthetic vegetation (PV)/non-photosynthetic vegetation (NPV) and bared soil (RS) mixture would be essential to establish the optimal spectral mixture model and further improve the estimation accuracy of sparse vegetation coverage in Hunshandake (Otindag) sandy land, Inner Mongolia of China. Over the pa...

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