Modeled effects of irrigation on surface climate in the Heihe River Basin, Northwest China

Zhang, Xuezhen; Xiong, Zhe; Tang, Qiuhong

doi:10.1002/2017jd026732

Cited by 51 publications

(56 citation statements)

References 62 publications

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“…Irrigation is supposed to induce TWS depletion when the basin is regarded as one unit, but the situation becomes complicated for spatial TWS variations. Currently, the irrigation effects are mainly investigated by using sensitivity studies through multiple sets of numerical experiments (Lei et al, ; Zhang et al, ; Zou et al, ). Given that the collected irrigation‐induced TWSC (TWSC IRR ) data derived from Döll et al () spanned from 1960 to 2009, and the studied period was 2003–2010, it was assumed that the TWSC IRR trends were the same between 2003–2009 and 2003–2010.…”

Section: Resultsmentioning

confidence: 99%

Quantitative Analysis of Terrestrial Water Storage Changes Under the Grain for Green Program in the Yellow River Basin

et al. 2019

JGR Atmospheres

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Afforestation‐induced changes in water resources have attracted worldwide attention. However, a clear picture of quantitative attribution of terrestrial water storage (TWS) variation from hydroclimatic and anthropogenic factors is still lacking. In this study, a quantitative analysis of TWS variation was conducted in the Yellow River basin of China under the Grain for Green project with consideration of irrigation. The results showed that the TWS has decreased (increased) more and more quickly (slowly) in the Loess Plateau (headwater region). The TWS increase corresponded to increased runoff and soil moisture in the headwaters, and the TWS depletion corresponded to decreased runoff and groundwater in the Loess Plateau and downstream regions. Regarding the TWS change (TWSC), it exhibited a negative trend across the basin. The increase in evapotranspiration (ET) dominated the basin‐averaged TWSC reduction, while the increase in ET was highly related to the increases in vegetation cover and irrigation water use. For spatial TWSC variations, the value of precipitation minus ET could account for most changes in TWSC, except for those in the headwater region and a region near the internally drained area. The increased vegetation coverage, which can affect multiple hydrological processes, played an important role in these two excluded regions. Importantly, the irrigation‐induced TWSC was considerable and varied with different irrigation water sources (i.e., surface water and groundwater). Overall, the impacts of afforestation and irrigation on TWS are sufficiently important. The research in this study can provide guidance for the water resource management during revegetation efforts.

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Section: Resultsmentioning

confidence: 99%

Quantitative Analysis of Terrestrial Water Storage Changes Under the Grain for Green Program in the Yellow River Basin

et al. 2019

JGR Atmospheres

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“…Future efforts will be dedicated to developing irrigation schemes with better representations of irrigation practices that consider, for example, irrigation frequency and timing, as well as irrigation methods (such as dripping, flooding). This can be achieved through coupling with more sophisticated land surface models, that is, Noah‐MP (e.g., Zhang et al, ), or enhanced urban canopy model (e.g., Yang & Wang, ).…”

Section: Discussionmentioning

confidence: 99%

“…The impact of large‐scale agricultural irrigation on rainfall has been extensively investigated and debated in previous studies (e.g., DeAngelis et al, ; Fowler et al, ; Im et al, ; Im & Eltahir, ; Mahalov et al, ; Zhang et al, ). Irrigation through increased soil moisture can possibly increase rainfall mainly due to enhanced low‐level moisture availability and increased moist static energy for convection.…”

Section: Introductionmentioning

confidence: 99%

Regional Impacts of Urban Irrigation on Surface Heat Fluxes and Rainfall in Central Arizona

et al. 2019

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Rapid urbanization over Phoenix has resulted in increased water consumption for maintenance of green spaces and heat stress mitigation. The hydrometeorological impact of urban irrigation is not well understood and is the principal objective of this study. Our results are based on high‐resolution numerical experiments using the Weather Research and Forecasting model. A simple irrigation scheme is implemented into the Weather Research and Forecasting model to represent changes in soil moisture due to irrigation. A monthlong simulation using the Weather Research and Forecasting model with irrigation shows improved model performance in representing the regional water and energy cycle. Comparisons of model simulations with and without irrigation highlight the regional impacts of urban irrigation on surface heat fluxes and rainfall variability over Phoenix. There is a strong modulation of irrigation on surface energy partitioning over both irrigated and nonirrigated areas. Irrigation increases (decreases) surface latent (sensible) heat fluxes by enhanced evapotranspiration over irrigated areas, with opposing changes presented over nonirrigated areas. Irrigation contributes little to the domain‐average rainfall accumulation, but can noticeably modify its spatial distribution, with increased rainfall over the downwind mountainous regions and decreased rainfall over the irrigated areas. Irrigation‐induced rainfall anomalies can be tied to strengthened thermal gradients and induced changes in surface pressure fields, which lead to perturbations on large‐scale flow and its interactions with complex terrain. Our results shed light on the hydrometeorological impacts of increasing anthropogenic water use driven by urbanization and highlight the importance of accurate representations of land surface processes in better characterizing land‐atmosphere interactions in arid/semiarid regions.

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“…The cooling effect signals of irrigation have been widely demonstrated across climate models and observations [23][24][25][26][27][28][29][30]63,64]. However, the magnitude of the effect varies according to differences in regional climate conditions as well as irrigation types [25,30,65,66].…”

Section: Temperature Responses From Different Irrigation Types and DImentioning

confidence: 99%

Seasonal Local Temperature Responses to Paddy Field Expansion from Rain-Fed Farmland in the Cold and Humid Sanjiang Plain of China

Liu

et al. 2018

Remote Sensing

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Numerous studies have documented the effects of irrigation on local, regional, and global climate. However, most studies focused on the cooling effect of irrigated dryland in semiarid or arid regions. In our study, we focused on irrigated paddy fields in humid regions at mid to high latitudes and estimated the effects of paddy field expansion from rain-fed farmland on local temperatures based on remote sensing and observational data. Our results revealed much significant near-surface cooling in spring (May and June) rather than summer (July and August) and autumn (September), which was −2.03 K, −0.73 K and −1.08 K respectively. Non-radiative mechanisms dominated the local temperature response to paddy field expansion from rain-fed farmland in the Sanjiang Plain. The contributions from the changes to the combined effects of the non-radiative process were 123.6%, 95.5%, and 66.9% for spring (May and June), summer (July and August), and autumn (September), respectively. Due to the seasonal changes of the biogeophysical properties for rain-fed farmland and paddy fields during the growing season, the local surface temperature responses, as well as their contributions, showed great seasonal variability. Our results showed that the cooling effect was particularly obvious during the dry spring instead of the warm, wet summer, and indicated that more attention should be paid to the seasonal differences of these effects, especially in a region with a relatively humid climate and distinct seasonal variations.

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Modeled effects of irrigation on surface climate in the Heihe River Basin, Northwest China

Cited by 51 publications

References 62 publications

Quantitative Analysis of Terrestrial Water Storage Changes Under the Grain for Green Program in the Yellow River Basin

Quantitative Analysis of Terrestrial Water Storage Changes Under the Grain for Green Program in the Yellow River Basin

Regional Impacts of Urban Irrigation on Surface Heat Fluxes and Rainfall in Central Arizona

Seasonal Local Temperature Responses to Paddy Field Expansion from Rain-Fed Farmland in the Cold and Humid Sanjiang Plain of China

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