Spatiotemporal variability of reference evapotranspiration and contributing climatic factors in China during 1961–2013

Wang, Zhaoli; Xie, Peimin; Lai, Chengguang; Chen, Xiaohong; Wu, Xushu; Zeng, Zhaoyang; Li, Jun

doi:10.1016/j.jhydrol.2016.11.021

Cited by 179 publications

(127 citation statements)

References 70 publications

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“…Because of its abundance, solar energy can play a prominent role in our future energy and reduce the dependency on fossil fuel. In addition, many researchers have discovered the importance and positive effect of solar radiation on crop yield [45,46]. During 1960 to 2015, the average daily solar radiation was higher in the north compared to the south for the wheat and maize growing seasons and the annual timescale.…”

Section: Spatial Analysismentioning

confidence: 99%

Spatio-Temporal Analysis of Meteorological Elements in the North China District of China during 1960–2015

Yang

Yin

et al. 2018

Water

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Abstract:The North China District (NCD) is one of the main grain production regions in China. The double cropping system of irrigation has been leading to the groundwater table decline at the speed of 1-2 m per year. Climate change leads to uncertainty surrounding the future of the NCD agricultural system, which will have great effects on crop yields and crop water demands. In this research, the Meteorological dataset from 54 weather station sites over the period 1960-2015 were collected to quantify the long-term spatial and temporal trends of meteorological data, including daily minimum temperature (T min ), maximum temperature (T max ), precipitation, solar radiation, reference evapotranspiration (ET 0 ), and aridity index (AI). The results show that the long-term wheat and maize growing season and annual average air temperatures (T min and T max ) showed strong north to south increasing trends throughout the NCD. The average annual precipitation was 632.9 mm across the NCD, more than 70% of which was concentrated in the maize growing season. The regional average annual ET 0 was 1026.1 mm, which was 531.2 and 497.4 mm for the wheat and maize growing season, respectively. The regional precipitation decreased from northwest to southeast in each growing season and annual timescale. The funnel areas have lower precipitation and higher ET 0 than the regional average, which may lead to the mining of the groundwater funnel area. The regional average annual AI is 0.63, which lies in the humid class. For temporal analysis, the regional average trends in annual T min , T max , solar radiation, ET 0 , precipitation, and AI were 0.37 • C/10a, 0.15 • C/10a, −0.28 MJ/day/m 2 /10a, −2.98 mm/10a, −12.04 mm/10a, and 0.005/10a, respectively. The increasing trend of temperature and the decreasing trend of solar radiation may have a negative effect on the regional food security. The funnel area AI showed a significant increasing trend for the winter wheat growing season and a decreasing trend for maize, which indicated that more irrigation will be needed for the maize growing season and the winter fallow policy may lead to the increasing trend precipitation being wasted. Analyzing the growing season and the annual meteorological elements of the spatiotemporal trends can help us better understand the influence of climate change on the natural resources and agricultural development in both the past and the future, and will provide us with invaluable information for the modification of cropping patterns to protect the regional and national water and food security.

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Section: Spatial Analysismentioning

confidence: 99%

Spatio-Temporal Analysis of Meteorological Elements in the North China District of China during 1960–2015

Yang

Yin

et al. 2018

Water

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“…In dry seasons (Spring and Winter) when there is limited P, increased crop water demand aggravated water shortage and then led to 395 serious adverse influence on food production (Fan et al, 2016). Wang et al (2017) found technological progress such as improved irrigation systems, uses of greenhouses for growing crops and seed improvement could counterbalance the increasing crop water demand caused by the increase in ETo in…”

Section: Implication Of Increasing Vpd and Eto For Future Agriculturamentioning

confidence: 99%

Climatic controls on watershed reference evapotranspiration vary dramatically during the past 50 years in southern China

Qin¹,

Hao²,

Sun³

et al. 2017

Preprint

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20Reference evapotranspiration (ETo) is an important hydrometeorological term widely used in water resource management, hydrological modeling, and understanding and projecting the hydrological effects of future climate change and land use change. Identifying the individual climatic controls on ETo helps better understand the processes of global climatic change impacts on local water resources and also simplify modeling efforts to predict actual evapotranspiration. We conducted a case study on the 3 atmospheric demand, instead of air temperature alone, is a major control on ETo. Thus, we conclude that accurately predicting current and future ETo and hydrological change under a changing climate must consider changes in VPD (i.e., air humidity and temperature) in the study region. Water resource 40 management in the study basin must consider the increasing trend of ETo to meet the associated increasing water demand for irrigation agriculture and domestic water uses.

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“…Soil-type data (1 km × 1 km) were obtained from the Food and Agriculture Organization of the United Nations (http://www.fao.org/home/en/). Runoff coefficient (RC): Land-cover types (LCT) are often affected by human activities, including bare land, open forest land and rural residential areas, and present high landslide potential [86,87]. A runoff coefficient (RC), measuring the runoff quantity that is converted by rainfall [61], was applied to quantify the LCT.…”

Section: Data and Pre-processingmentioning

confidence: 99%

GIS-Based Random Forest Weight for Rainfall-Induced Landslide Susceptibility Assessment at a Humid Region in Southern China

Wang

Bai

et al. 2018

Water

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Landslide susceptibility assessment is presently considered an effective tool for landslide warning and forecasting. Under the assessment procedure, a credible index weight can greatly increase the rationality of the assessment result. Using the Beijiang River Basin, China, as a case study, this paper proposes a new weight-determining method based on random forest (RF) and used the weighted linear combination (WLC) to evaluate the landslide susceptibility. The RF weight and eight indices were used to construct the assessment model. As a comparison, the entropy weight (EW) and weight determined by analytic hierarchy process (AHP) were also used, respectively, to demonstrate the rationality of the proposed weight-determining method. The results show that: (1) the average error rates of training and testing based on RF are 18.12% and 15.83%, respectively, suggesting that the RF model can be considered rational and credible; (2) RF ranks the indices elevation (EL), slope (SL), maximum one-day precipitation (M1DP) and distance to fault (DF) as the Top 4 most important of the eight indices, occupying 73.24% of the total, while the indices runoff coefficient (RC), normalized difference vegetation index (NDVI), shear resistance capacity (SRC) and available water capacity (AWC) are less consequential, with an index importance degree of only 26.76% of the total; and (3) the verification of landslide susceptibility indicates that the accuracy rate based on the RF weight reaches 75.41% but are only 59.02% and 72.13% for the other two weights (EW and AHP), respectively. This paper shows the potential to provide a new weight-determining method for landslide susceptibility assessment. Evaluation results are expected to provide a reference for landslide management, prevention and reduction in the studied basin.

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Spatiotemporal variability of reference evapotranspiration and contributing climatic factors in China during 1961–2013

Cited by 179 publications

References 70 publications

Spatio-Temporal Analysis of Meteorological Elements in the North China District of China during 1960–2015

Spatio-Temporal Analysis of Meteorological Elements in the North China District of China during 1960–2015

Climatic controls on watershed reference evapotranspiration vary dramatically during the past 50 years in southern China

GIS-Based Random Forest Weight for Rainfall-Induced Landslide Susceptibility Assessment at a Humid Region in Southern China

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