Climatic Controls on Watershed Reference Evapotranspiration Varied during 1961–2012 in Southern China

Qin, Mengsheng; Hao, Lu; Sun, Lei; Liu, Yongqiang; Sun, Ge

doi:10.1111/1752-1688.12714

Cited by 18 publications

(25 citation statements)

References 73 publications

(200 reference statements)

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“…The consistent trends between ET with each land use type and ET o demonstrated that meteorological factors were controlling factors for ET at the pixel scale. However, we showed that watershed-level ET had a significant decreasing trend in the QRB, coincident with previous studies [2,42]. This was in contrast to the global warming trend and ET was expected to increase under increasing air temperature in the study region [73][74][75].…”

Section: Effects Of Land Use and Land Cover Changes On All Et Componentssupporting

confidence: 89%

“…Du et al [6] quantified the effects of urbanization on flood events using the Hydrologic Engineering Center's Hydrologic Modeling System (HEC-HMS) for the same study area and found that the stream peak-flow of eight selected floods increased from 2.3% to 13.9% when urban built-up areas increased from 3% in 1988 to 31% in 2018. [29,32,33] As the only common term between surface energy balance and hydrological cycle, ET is a critical process to understand the impacts of LULC change on the hydrology and local climate in the QRB [2,[41][42][43]. However, some of these previous regional studies during the past decade focused on reference evapotranspiration rate (ET o ), which only represented the atmospheric evaporating capability of a hypothetical reference vegetated field [16].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Urbanization on Watershed Evapotranspiration and Its Components in Southern China

Zheng

Hao

Huang

et al. 2020

Water

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Understanding the effects of land use change on evapotranspiration (ET) and its partitioning to transpiration and evaporation is important for accurately evaluating the likely environmental impacts on watershed water supply, climate moderation, and other ecosystem services (e.g., carbon sequestration and biodiversity). This study used a distributed hydrologic model, MIKE SHE, to partition evapotranspiration into soil evaporation, transpiration, ponded water evaporation, and interception, and examined how the ET partitions affected the water balance in the Qinhuai River Basin from 2000 to 2013. Simulated daily ET was compared to measurements at an eddy flux research site during 2016–2017 (R2 = 0.72). Degradation in rice-wheat rotation fields and expansion of impervious surfaces impacted not only total watershed evapotranspiration, which showed a significant downward trend (p < 0.05), but also its partitioning. A significant (p < 0.01) decrease in transpiration was detected. Ponded water evaporation was the only ET partition that exhibited a significant positive trend (p < 0.05). We concluded that the reduced transpiration as a result of land use and land cover change was the primary factor driving the variation of watershed scale evapotranspiration. In addition, there was an increase in annual water yield (23%) as a response to significant reduction in ET (7%) due to a 175% expansion of urban area in the study watershed. Our study provided insights to the mechanisms of land surface–water cycle interaction and better understanding of the effects of land use change on urban micro-climate such as “urban dry island” and “urban heat island” effects.

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Section: Effects Of Land Use and Land Cover Changes On All Et Componentssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Effects of Urbanization on Watershed Evapotranspiration and Its Components in Southern China

Zheng

Hao

Huang

et al. 2020

Water

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“…They showed that the aerodynamic component explained most of the interannual variability and temporal trends in AED and suggested an increase in AED in arid and semi‐arid regions associated to increased VPD. Several recent studies support stronger aerodynamic control on recent trends in AED, with special focus on the influence of RH (Jerszurki, de Souza, & Silva, ; Johnson & Sharma, ; Qin, Hao, Sun, Liu, & Sun, ; Stephens et al, ; Vicente‐Serrano, Azorin‐Molina, Sanchez‐Lorenzo, Revuelto, López‐Moreno, et al, ; Vicente‐Serrano, Azorin‐Molina, Sanchez‐Lorenzo, Revuelto, Morán‐Tejeda, et al, ; Vicente‐Serrano, Lopez‐Moreno, et al, ). Other studies also suggest generalized decrease in RH in mid‐latitude regions (Vicente‐Serrano, Nieto, et al, ; Willett et al, ), with a resulting impact in AED trends (Stephens et al, ; Vicente‐Serrano, Azorin‐Molina, Sanchez‐Lorenzo, Revuelto, López‐Moreno, et al, ; Vicente‐Serrano, Azorin‐Molina, Sanchez‐Lorenzo, Revuelto, Morán‐Tejeda, et al, ; Vicente‐Serrano, Lopez‐Moreno, et al, ; Vicente‐Serrano et al, ).…”

Section: Aed‐related Drought Trendsmentioning

confidence: 95%

Unraveling the influence of atmospheric evaporative demand on drought and its response to climate change

Vicente‐Serrano

McVicar

Miralles

et al. 2019

WIREs Climate Change

164

163

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This review examines the role of the atmospheric evaporative demand (AED) in drought. AED is a complex concept and here we discuss possible AED definitions, the subsequent metrics to measure and estimate AED, and the different physical drivers that control it. The complex influence of AED on meteorological, environmental/agricultural and hydrological droughts is discussed, stressing the important spatial differences related to the climatological conditions. Likewise, AED influence on drought has implications regarding how different drought metrics consider AED in their attempts to quantify drought severity. Throughout the article, we assess literature findings with respect to: (a) recent drought trends and future projections; (b) the several uncertainties related to data availability; (c) the sensitivity of current drought metrics to AED; and (d) possible roles that both the radiative and physiological effects of increasing atmospheric CO 2 concentrations may play as we progress into the future.All these issues preclude identifying a simple effect of the AED on drought severity.Rather it calls for different evaluations of drought impacts and trends under future climate scenarios, considering the complex feedbacks governing the climate system. This article is categorized under: Paleoclimates and Current Trends > Earth System Behavior K E Y W O R D S atmospheric evaporative demand,

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“…Moreover, Cong et al [ 23 ] and Zhang et al [ 24 ] both found the increased ET o along with the rising air temperature throughout the whole China after 1980. In recent years, based on the updated meteorological data, some studies have presented a view that the ET o has had different change points regionally [ 25 , 26 ], which may impact the spatiotemporal characteristics of the “evaporation paradox” in different regions of China.…”

Section: Introductionmentioning

confidence: 99%

Impact of climate change on “evaporation paradox” in province of Jiangsu in southeastern China

et al. 2021

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Contrary to the common expectation that the reference evapotranspiration (ETo), which is an indicator of the atmospheric evaporation capability, increases in warming climate, the decline of the ETo has been reported worldwide, and this contradiction between the expected increasing ETo and the observed decreasing one is now termed the “evaporation paradox”. Based on the updated meteorological data (1960–2019), we separately detected the spatiotemporal characteristics and the causes of the “evaporation paradox” in three subregions, namely Huaibei, Jianghuai, and Sunan, and throughout the entire province of Jiangsu in southeastern China. Different from the reported continuous unidirectional variations in the ETo, in the province of Jiangsu, it generally showed a decreasing trend before 1990 but followed an increasing trend from 1990 to 2019, which led to the different characteristics of the “evaporation paradox” in the periods from 1960 to 1989, from 1990 to 2019, and from 1960 to 2019. In the first 30 years, the reduction of the wind speed (WS) was the main reason for the decreased ETo, which consequently gave rise to the “evaporation paradox” in spring and winter in the Huaibei region and only in winter in the two other subregions and throughout the entire province. We noticed that the “evaporation paradox” in spring in the Sunan region was expressed by the decreased daily mean air temperature (Tmean) and the increased ETo which was chiefly induced by the decreased relative humidity (RH) and the increased vapor pressure deficit (VPD). After 1990, the decreased WS also dominated the decreased ETo and resulted in the “evaporation paradox” in winter in the Jianghuai region. Furthermore, the decreased sunshine hour (SH) was the main factor influencing the decreased ETo, thereby inducing the “evaporation paradox” in summer and autumn in the Jianghuai region and only in autumn in the Huaibei region and throughout the whole province from 1990 to 2019. In the whole study period from 1960 to 2019, the decreased SH was also found to be responsible for the decreased ETo and for the “evaporation paradox” in summer in all the subregions and throughout the whole province. However, regarding the “evaporation paradox” in autumn, in winter, and in the entire year in the Huaibei region and throughout the whole province, the observed decreased ETo was largely due to the reduced WS from 1960 to 2019. In summary, in addition to the air temperature, the ETo has shifted due to the other meteorological variables (especially the WS, the SH, and the VPD) and shaped the unique spatiotemporal characteristics of the “evaporation paradox” in the province of Jiangsu in southeastern China. Moreover, future studies and simulations addressing the regional climate change and hydrological cycles should take account of the changeable key meteorological variables in different subregions and seasons of the province of Jiangsu.

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Climatic Controls on Watershed Reference Evapotranspiration Varied during 1961–2012 in Southern China

Cited by 18 publications

References 73 publications

Effects of Urbanization on Watershed Evapotranspiration and Its Components in Southern China

Effects of Urbanization on Watershed Evapotranspiration and Its Components in Southern China

Unraveling the influence of atmospheric evaporative demand on drought and its response to climate change

Impact of climate change on “evaporation paradox” in province of Jiangsu in southeastern China

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