Impact of climate change on potential evapotranspiration (case study: west and NW of Iran)

Dinpashoh, Yagob; Jahanbakhshasl, S; Rasouli, Ali; Foroughi, M.; Singh, Vijay P.

doi:10.1007/s00704-018-2462-0

Cited by 60 publications

(20 citation statements)

References 38 publications

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“…The results revealed significant decreasing trends (at p = 0.01) in PET during 1931-1960 period but significant increasing trends (at p = 0.1) during 1961-1990 over the entire West African region. This pattern of variations is in agreement with the findings of Dinpashoh et al [27] in north-west Iran where most of the stations selected (86% of the sites) also showed increasing trends in PET between 1997 and 2016.…”

Section: Discussionsupporting

confidence: 92%

“…Some of them had pointed out upward trends in PET time-series analysis. These include the works of Gao et al [22] and Liu et al [15] over China regions; Chaouche et al [23] in France; Kousari et al [24], Tabari et al [25] and Talaee et al [26] in Iran; Jhajharia et al [14] in India; Dinpashoh et al [27] in north-west Iran; Onyutha [28] in Nile River and Ashaolu and Iroye [10] in western Nigeria. Others reported downward trends or both, e.g.…”

Section: Introductionmentioning

confidence: 99%

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Potential evapotranspiration trends in West Africa from 1906 to 2015

et al. 2019

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In this study, Climate Research Unit monthly observations were used to assess the trends of potential evapotranspiration (PET) over West Africa from 1906 to 2015. Trends and changes in PET during the 110-year study period and two reference climatological periods (1931-1960 and 1961-1990) were examined. Nonparametric trend test of the Mann-Kendall and Kolmogorov-Smirnov was employed to find the changes in trends of PET and their significance or otherwise. The contributions of some meteorological parameters (air temperatures, precipitation and cloud cover) to the observed trends in PET were also examined. Results of long-term data analysis showed mixed trends in PET in the three designated zones (Guinea, Savanna and Sahel) but notable significant increasing trends (0.165 mm per year) at p = 0.1 in Sahel. However, very sharp differences in PET were observed in both reference periods across the zones with significant decreasing trends (at p = 0.01) in PET during the first period but increasing significant trends (at p = 0.1) during the second. In spite of this pattern of variations, general reductions in PET (− 0.6% to − 1.2%) were observed, which were found to be triggered by decrease in temperature (− 0.13 to − 1.07%) and vapour pressure (− 0.02 to − 0.33%) as well as increase in cloudiness (0.01-0.05%). However, the magnitudes of changes in PET were found to be insignificant in all the zones. Maximum temperature, more than other dominant climatic parameters, contributed significantly (Theil-Sen's regression: 23.5% ≤ β ≤ 50.3%; p = 0.01) to observed variations in PET.

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Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Potential evapotranspiration trends in West Africa from 1906 to 2015

et al. 2019

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“…The temperature rose and precipitation declined slightly in response to global climate change in the Yanhe watershed from 1982-2012. As one of the sensitive climatic factors for PET, the temperature had a positive influence on the PET [60,61], so the PET in the study area increased with temperature over the research period. Because the PET and temperature increased prominently from 1982 to 2012, the Yanhe watershed tended to be warmer and drier, which prevented the precipitation from generating and developing into the surface runoff.…”

Section: Annual Hydro−meteorological Variabilitiesmentioning

confidence: 99%

Quantitative Analysis of Hydrological Responses to Climate Variability and Land-Use Change in the Hilly-Gully Region of the Loess Plateau, China

Kang

Gao

Shao

et al. 2019

Water

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Climate and land-use change are the two main driving forces that affect watershed hydrological processes. Separately assessing their impacts on hydrology is important for land-use planning and water resource management. In this research, the SWAT (Soil and Water Assessment Tool) and statistical methods were applied to evaluate the effects of climate and land-use change on surface hydrology in the hilly-gully region of the Loess Plateau. The results showed that surface runoff and soil water presented a downward tendency, while evapotranspiration (ET) presented an upward tendency in the Yanhe watershed from 1982 to 2012. Climate is one the dominant factors that influence surface runoff, especially in flooding periods. The average contribution rate of surface runoff on stream flow accounted for 55%, of which the flooding period accounted for 40%. The runoff coefficient declined by 0.21 after 2002 with the land-use change of cropland transformed to grassland and forestland. The soil water exhibited great fluctuation along the Yanhe watershed. In the upstream region, the land-use was the driving force to decline soil water, which reduced the soil water by 51%. Along the spatial distribution, it converted from land-use change to climate variability from northwest to southeast. The ET was more sensitive to land-use change than climate variability in all sub-basins, and increased by 209% with vegetation restoration. To prevent the ecosystem degradation and maintain the inherent ecological functions of rivers, quantitative assessment the influence of climate variability and land-use change on hydrology is of great importance. Such evaluations can provide insight into the extent of land use/cover change on regional water balance and develop appropriate watershed management strategies on the Loess Plateau.

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“…Both upward and downward trends of ET 0 have been detected in different parts of the world (Dinpashoh et al ., ; ; Zhang et al ., ; Huntington and Billmire, ; Tabari et al ., ; Yang et al ., ). Generally, the significant increases in ET 0 dominated in the eastern coastal regions of North America, the middle and east of Europe, the west and south of Africa and the northeast and southeast of the Asian continent (Yan et al ., ).…”

Section: Discussionmentioning

confidence: 99%

Variation of reference evapotranspiration and its teleconnection with multiple large‐scale climate oscillations in the Yangtze River Delta, China

2019

Intl Journal of Climatology

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Evapotranspiration is a key factor in regional hydrological processes and water resources management. Long‐term variation of evapotranspiration affects the regional climate wet/dry tendency and agricultural production profoundly. Thus, reference evapotranspiration (ET0) values for 46 meteorological stations in the Yangtze River Delta (YRD) were calculated for 1957–2014 using the FAO‐Penman–Monteith (FAO‐PM) method. The variation patterns of ET0 values were determined based on the principal component analysis (PCA) method. In addition, the methods of cross wavelet transform (CWT), Kendall tau‐b correlation coefficient determination and cross‐correlation method were applied in the assessment of the correlation between ET0 values and large‐scale climate oscillations, such as the North Atlantic Oscillation (NAO), the Pacific Decadal Oscillation (PDO), the Oceanic Niño3.4 Sea Surface Temperature Index (NINO) and the Indian Ocean Dipole (IOD). Annual ET0 patterns for three dominant geographic subregions of the YRD (the southeastern, northwestern and mid‐eastern) were determined. There were only several discontinuous lower timescale bands between the three change patterns of annual ET0 and climate oscillations. In seasonal scale, the temporal patterns of ET0 changed simultaneously with the NAO, NINO and PDO in spring, the PDO in summer and the NAO in winter. The monthly ET0 was mostly influenced by the NAO and IOD in January, the IOD in February, the IOD and NINO in March, the NINO in June, the PDO in July to October, the NINO, IOD and NAO in October and the NINO in December. The lag times for the ET0 changes were about 0–5 months for the NAO and NINO, 1–2 months for the PDO and 4 months for the IOD.

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Impact of climate change on potential evapotranspiration (case study: west and NW of Iran)

Cited by 60 publications

References 38 publications

Potential evapotranspiration trends in West Africa from 1906 to 2015

Potential evapotranspiration trends in West Africa from 1906 to 2015

Quantitative Analysis of Hydrological Responses to Climate Variability and Land-Use Change in the Hilly-Gully Region of the Loess Plateau, China

Variation of reference evapotranspiration and its teleconnection with multiple large‐scale climate oscillations in the Yangtze River Delta, China

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