Predicting the climate change impacts on water-carbon coupling cycles for a loess hilly-gully watershed

Zhao, Fubo; Wu, Yiping; Yao, Yingying; Sun, Ke; Winowiecki, Leigh A.; Vågen, Tor-Gunnar; Xu, Jianchu; Qiu, Linjing; Sun, Pengcheng; Sun, Yuzhu

doi:10.1016/j.jhydrol.2019.124388

Cited by 47 publications

(31 citation statements)

References 60 publications

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“…The response of LAI increases rapidly during 17–24 days of flash drought for southern China, which is comparable to northern China. In addition, the accumulated impact of flash droughts on the ecosystems may also be related to the characteristics of flash droughts including severity and duration [ 42 , 43 ], and the longer flash droughts would cause more carbon loss of terrestrial ecosystems. Although the soil moisture drought recovers, it needs time for vegetation to recover to its normal condition.…”

Section: Discussionmentioning

confidence: 99%

Remote sensing of the impact of flash drought events on terrestrial carbon dynamics over China

Zhang

Yuan

Otkin

2020

Carbon Balance Manage

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Background Flash drought poses a great threat to terrestrial ecosystems and influences carbon dynamics due to its unusually rapid onset and increasing frequency in a warming climate. Understanding the response of regional terrestrial carbon dynamics to flash drought requires long-term observations of carbon fluxes and soil moisture at a large scale. Here, MODIS satellite observations of ecosystem productivity and ERA5 reanalysis modeling of soil moisture are used to detect the response of ecosystems to flash drought over China. Results The results show that GPP, NPP, and LAI respond to 79–86% of the flash drought events over China, with highest and lowest response frequency for NPP and LAI, respectively. The discrepancies in the response of GPP, NPP, and LAI to flash drought result from vegetation physiological and structural changes. The negative anomalies of GPP, NPP, and LAI occur within 19 days after the start of flash drought, with the fastest response occurring over North China, and slower responses in southern and northeastern China. Water use efficiency (WUE) is increased in most regions of China except for western regions during flash drought, illustrating the resilience of ecosystems to rapid changes in soil moisture conditions. Conclusions This study shows the rapid response of ecosystems to flash drought based on remote-sensing observations, especially for northern China with semiarid climates. Besides, NPP is more sensitive than GPP and LAI to flash drought under the influence of vegetation respiration and physiological regulations. Although the mean WUE increases during flash drought over most of China, western China shows less resilience to flash drought with little changes in WUE during the recovery stage. This study highlights the impacts of flash drought on ecosystems and the necessity to monitor rapid drought intensification.

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Section: Discussionmentioning

confidence: 99%

Remote sensing of the impact of flash drought events on terrestrial carbon dynamics over China

Zhang

Yuan

Otkin

2020

Carbon Balance Manage

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“…One of the most important tools to get precise information about the study area are geolocated photos and reports [27][28][29] prepared by governmental authority or volunteers. erefore, by searching the Internet webpages, a report of economic losses prepared by El-Buhayra local governorate and geolocated terrestrial images captured after the flood directly were found.…”

Section: Social Media Datamentioning

confidence: 99%

Low‐Cost Solutions for Assessment of Flash Flood Impacts Using Sentinel‐1/2 Data Fusion and Hydrologic/Hydraulic Modeling: Wadi El‐Natrun Region, Egypt

Sadek

Mostafa

et al. 2020

Advances in Civil Engineering

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Flash floods are among the most common natural hazards in Egyptian and Arabian deserts. In this work, we utilized two Sentinel-1 and Sentinel-2 satellite images, before and after the flash flood, SRTM, and geolocated terrestrial photos captured by volunteers. This paper aims to three substantial objectives: (1) monitoring the flash flood impacts on Wadi El-Natrun region based on free satellite data and mapping the destroyed vegetation cover; (2) the integration of the free remote sensing data, geolocated terrestrial photos, and GIS techniques, along with hydrologic and hydraulic modeling, to evaluate the impact of flash flood hazards on the study area; and (3) assistance of the decision-makers in planning the required protective works to avoid the probable flooding. Two scenarios have been applied to estimate the flash flood effect. The first scenario has relied on Sentinel-1/2 data fusion before and after the flash flood, while the second scenario has been implemented based on the integration of the Sentinel-2 images and hydrologic and hydraulic flood modeling with the help of ArcGIS software to simulate the flash flood route. The results demonstrated that although the first scenario is an efficient solution for continuous monitoring of the change in the water bodies, it is limited in the detection of the submerged vegetation area. On the other hand, the second scenario provided the flash flood route and hydrological parameters, which determine the hazard degree of the basins, thus helping the decision-maker to manage the flood risk. Moreover, the second scenario surpasses the first one by estimating the destroyed infrastructure. Consequently, the second scenario is appropriate to assess the flash flood impacts and mitigate its influence in the future.

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“…Considering this part of water use would lead to more water consumption and a higher impact on the health of the underground water system. evaporation but also to a reduction in necessary water absorption by roots [61].…”

Section: Ideal Oasis Scale For a Sustainable Groundwater Systemmentioning

confidence: 99%

The impact of increasing land productivity on groundwater dynamics: a case study of an oasis located at the edge of the Gobi Desert

Li²,

Xie

et al. 2020

Preprint

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Background: Intensification of agricultural systems may result in overexploitation of water resources in arid regions because enhanced productivity of crops is often associated with increased actual evapotranspiration (AET). The aim of this study was to quantify the effect of increased regional AET on the groundwater level in a case study of the oasis located within the Shiyang River Basin near the edge of the Gobi Desert.Result: The results of the study show that regional AET increased during the period from 1981 to 2010 due to increasing oasis area and air temperature. The water losses due to AET exceeded the water supply from the mountainous discharges of the basin by the end of this period, leading to groundwater overexploitation in the oasis area.Conclusions: This case study shows the importance of considering the effect of climate change on water losses associated with increasing agricultural production for the sustainable agricultural development of arid regions.

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Predicting the climate change impacts on water-carbon coupling cycles for a loess hilly-gully watershed

Cited by 47 publications

References 60 publications

Remote sensing of the impact of flash drought events on terrestrial carbon dynamics over China

Remote sensing of the impact of flash drought events on terrestrial carbon dynamics over China

Low‐Cost Solutions for Assessment of Flash Flood Impacts Using Sentinel‐1/2 Data Fusion and Hydrologic/Hydraulic Modeling: Wadi El‐Natrun Region, Egypt

The impact of increasing land productivity on groundwater dynamics: a case study of an oasis located at the edge of the Gobi Desert

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