Temporal variations and evaporation control effect of the stable isotope composition of precipitation in the subtropical monsoon climate region, Southwest China

Xiaojiao, Guo; Gong, Xiaoping; Shi, Jiansheng; Guo, Jiming; Domínguez‐Villar, David; Lin, Yushi; Wang, Huiwei; Yuan, Daoxian

doi:10.1016/j.jhydrol.2021.126278

Cited by 17 publications

(11 citation statements)

References 90 publications

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“…Different evaporation processes across the basin result in different degrees of evaporative fractionation of the stable isotopic composition of the river water (Levy, 1978; Tsujimura & Tanaka, 2015). In general, the stronger the evaporation, the more enriched the stable isotopic composition of the river water (Craig & Gordon, 1965; Guo et al, 2021). In addition to the elevation effect of the isotopic composition of different runoff recharge sources, the isotopic evaporation effect from upstream to downstream also causes spatial variation in the source of runoff recharge.…”

Section: Discussionmentioning

confidence: 99%

“…(d-f) For the midstream area. (g-i) For the downstream area uncertainty caused by spatial and temporal variability in tracer concentrations is often the greatest(He et al, 2020). To test the feasibility of dividing runoff sources into different areas based on the spatial variability of the basin, we compared the uncertainty in the hydrograph separation under the influence of spatial variability (scenario 1) and without considering spatial variability (scenario 2) (Figure9).…”

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confidence: 99%

“…et al, 2010). End member mixing analysis (EMMA) evaluated the contribution ratio of runoff from different sources by selecting the most appropriate end-member: after identifying the best tracer, principal component analysis (PCA) and residual analysis were conducted to determine the dimension of the hydrological system, then identify the most suitable dimension, and finally calculate the contribution of each end-element to the flow (He et al, 2020). It can accurately identify and quantify various supply sources' contributions by combining isotopes and hydrochemical tracers (Li et al, 2016).…”

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Spatial variability of runoff recharge sources and influence mechanisms in an arid mountain flow‐producing zone

Sang

Zhu

Qiu

et al. 2022

Hydrological Processes

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In‐depth knowledge of the hydrological conditions of basins in arid regions can help to maintain the long‐term water security. The mechanisms of runoff generation and flow paths in different landscape areas are not fully known due to spatial variability. We have explored the mechanisms by which spatial variability affects the runoff recharge sources in the Xiying River Basin. The results showed that the spatial variability of the sources and generation mechanisms of runoff in the arid mountain flow‐producing zone is the result of the combined effect of different landscape, elevation and meteorological elements. In the upstream area, the short mean transit time (MTT) combined with the high contribution of recharge from the meltwater (29.32%) and the proportion of pre‐event water (between 60% and 90%) means that runoff production processes are strongly controlled by meltwater recharge and precipitation events. The MTT and the proportion of pre‐event water in the midstream area are ranked in the middle of the three landscape areas, but the highest contribution of precipitation (16.57%) indicates the importance of precipitation to runoff production processes. In the downstream area, the MTT is the longest and the proportion of pre‐event water is the smallest, and groundwater remains the basis for long‐term stability of runoff (groundwater contribution rate: 40.62%). By enhancing the spatial resolution for identifying runoff recharge sources can reduce the model uncertainty by 69%. Thus, taking full account of the spatial heterogeneity in arid regions is an important initiative to achieve scientific water resources management.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Spatial variability of runoff recharge sources and influence mechanisms in an arid mountain flow‐producing zone

Sang

Zhu

Qiu

et al. 2022

Hydrological Processes

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“…A change in composition or conditions causes the mixture to transfer into polymer-rich and polymer-poor phase to form a homogeneous mixture. Other ways to yield highly efficient polymeric membranes for water treatment are precipitation by controlled evaporation and thermal precipitation of the vapor phase ( Guo et al., 2021 ). Key factors influencing phase inversion include solvent, polymer solution, nonsolvent system, and the composition of coagulation bath ( Urducea et al., 2020 ).…”

Section: Fabrication Strategies Of Membranesmentioning

confidence: 99%

Recent progress in nanomaterial-functionalized membranes for removal of pollutants

Nain¹,

Sangili²,

Hu³

et al. 2022

iScience

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“…Our results (Figures 3, 5, 6) are consistent with these findings and suggest Frontiers in Environmental Science frontiersin.org that moisture sources play a significant role in explaining the observed seasonal variation in δ 18 O p . Notably, there is no single source of water vapor on a seasonal scale, with various water vapor mixing and dominating by turns occurring at different periods (Li et al, 2020;Guo et al, 2021). Therefore, due to the seasonal variation in precipitation isotopes in the region, the paleoclimate δ 18 O records of this region may be able to reflect the strength of EASM in the region.…”

Section: Seasonal Variation Of Precipitation Isotopesmentioning

confidence: 99%

Isotope composition of daily precipitation from 2019 to 2020 in Sanming, southeastern China

Cai

Yang

Zhou

et al. 2022

Front. Environ. Sci.

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Introduction: Many studies in southeastern China (SEC) have used stable isotope (δD and δ18O) records from natural archives (e.g., stalagmites, tree-ring cellulose, sediments) to reconstruct past East Asian Summer Monsoon (EASM) climate. However, the interpretation of the meanings of isotope variation in these records has not been fully resolved, and the key to solve this problem is to clarify the referential meaning of modern precipitation isotopes.Methods: In this study, we collected daily precipitation from January 2019 to December 2020 in Sanming to clarify the characteristics of isotope variations and their controlling factors during different seasonal periods [e.g., non-summer monsoon (NSM) and summer monsoon (SM)] in SEC.Results and Discussion: Our results show that the precipitation δ18O (δ18Op) and d-excess values in the SM season (−12.94‰–0.15‰, −4.05‰–21.01‰) were more light than those in the NSM season (−6.91‰–4.37‰, 0.85‰–30.38‰). Combining the findings of backward trajectory and averaged outgoing longwave radiation analyses, the seasonal variation of precipitation isotopes is believed to be determined by a shift in water vapor sources and the intensity of upstream atmospheric convection during water vapor transportation. The consistent variation between the isotope values and convective intensity over the South China Sea in the dragon boat rainy period highlights that δ18Op has the potential to respond rapidly to the upstream convective intensity and can serve as a substitute method for investigating the complicated East Asian summer monsoon system. Therefore, the results of this study imply that the stable isotopes in precipitation and related paleoclimate proxies may not reflect the signal of temperature or precipitation alone but rather reflect changes in moisture sources and upstream convective intensity.

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Temporal variations and evaporation control effect of the stable isotope composition of precipitation in the subtropical monsoon climate region, Southwest China

Cited by 17 publications

References 90 publications

Spatial variability of runoff recharge sources and influence mechanisms in an arid mountain flow‐producing zone

Spatial variability of runoff recharge sources and influence mechanisms in an arid mountain flow‐producing zone

Recent progress in nanomaterial-functionalized membranes for removal of pollutants

Isotope composition of daily precipitation from 2019 to 2020 in Sanming, southeastern China

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