Spatial distribution and temporal variation of reference evapotranspiration in arid and semi-arid regions of Iran

2011 ◽  
Vol 26 (4) ◽  
pp. 500-512 ◽  
Author(s):  
Hossein Tabari ◽  
Ali Aeini ◽  
P. Hosseinzadeh Talaee ◽  
B. Shifteh Some'e
Keyword(s):  
Spatial Distribution ◽  
Temporal Variation ◽  
Arid Regions ◽  
Reference Evapotranspiration ◽  
Semi Arid

Spatio-temporal Variation of Soil Respiration and Its Driving Factors in Semi-arid Regions of North China

2018 ◽  
Vol 28 (1) ◽  
pp. 12-24 ◽  
Author(s):  
Xinhua Zeng ◽  
Yigang Song ◽  
Wanjun Zhang ◽  
Shengbing He
Keyword(s):  
Soil Respiration ◽  
Temporal Variation ◽  
Arid Regions ◽  
North China ◽  
Driving Factors ◽  
Spatio Temporal ◽  
Semi Arid

scholarly journals Spatial and temporal variation of precipitation characteristics in the semiarid region of Xi'an, northwest China

2021 ◽  
Author(s):  
Hao Han ◽  
Jingming Hou ◽  
Rengui Jiang ◽  
Jiahui Gong ◽  
Ganggang Bai ◽  
...  
Keyword(s):  
Temporal Variation ◽  
Arid Regions ◽  
Resource Planning ◽  
Northwest China ◽  
Annual Precipitation ◽  
Spatial And Temporal Variation ◽  
Semiarid Region ◽  
Monthly Precipitation ◽  
Xi’An City ◽  
Semi Arid

Abstract Precipitation variations mostly affect the water resource planning in semi-arid regions of northwest China. The objective of this study is to quantitatively explore the spatial and temporal variations of precipitation in different time scales in Xi'an city area. The Mann–Kendall test and wavelet analysis methods were applied to analyze the precipitation variability. In terms of temporal variation of precipitation, the results indicated that the annual precipitation exhibited a significant decreasing trend during 1951–2018. Except for summer precipitation representing a slightly increasing trend, the other seasonal precipitations had a similar decreasing trend to annual precipitation throughout 1951–2018. The monthly precipitation had different change trends, showing the precipitation from June to September could account for 58.4% of the total annual precipitation. In addition, it was clear that annual precipitation had a significant periodic change, with the periods of 6, 13, 19, and 27 years. For the spatial variation of precipitation during 1961–2018, the results showed that annual and seasonal precipitation exhibited obvious spatial differences, indicating an increasing spatial trend from north to south. Thus, understanding the precipitation variation in Xi'an city can provide a theoretical foundation of future water resources management for other cities in semi-arid regions of northwest China.

scholarly journals Assessing suitability of temperature-based reference evapotranspiration methods for semi-arid basin of Maharashtra

2021 ◽  
Vol 21 (3) ◽  
pp. 351-356
Author(s):  
P.S. WABLE ◽  
M.K. JHA ◽  
S.D. GORANTIWAR
Keyword(s):  
Climatic Condition ◽  
Arid Regions ◽  
Reference Evapotranspiration ◽  
Monsoon Season ◽  
Meteorological Data ◽  
Temperature Data ◽  
Western India ◽  
Climatic Data ◽  
Suitable Temperature ◽  
Semi Arid

FAO Penman-Monteith (FAO-PM) is deemed as a sole standard method for estimating reference evapotranspiration (ET ). However, limited availability of meteorological data at spatial and temporal o scales restricts the application of this method. To address this issue, the FAO 56 experts suggested three methods when only maximum and minimum temperature data are available: (i) Temperature-based Penman-Monteith (PMT-1) method wherein T ≈ T (ii) PMT-2 wherein T ≈ T -2.5, and (iii) dew min dew min Hargreaves method. These ET methods were assessed for a semi-arid basin of Western India which lacks adequate climatic data. The performances of the ET methods were evaluated against the standard FAO-PM method using salient statistical and graphical indicators, together with the sensitivity analysis. The results of the three temperature-based methods had a tendency of over-predication of ET in the study area. The PMT-1 method, however, provided superior ET estimates compared to PMT-2 and Hargreaves methods. For estimating monthly ET , the FAO-PM method was most sensitive to temperature. Further, ET of the monsoon season over the study area increased from 5 to 12% during 'drought' years compared to 'normal' years. It was concluded that PMT-1 method is the most suitable temperature-based method for estimating ET in semi-arid regions under limited climatic condition.

scholarly journals Spatial distribution of greenhouse gas concentrations in arid and semi-arid regions: A case study in East Asia

2013 ◽  
Vol 91 ◽  
pp. 119-128 ◽  
Author(s):  
M. Guo ◽  
X.-F. Wang ◽  
J. Li ◽  
K.-P. Yi ◽  
G.-S. Zhong ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
East Asia ◽  
Greenhouse Gas ◽  
Arid Regions ◽  
Semi Arid
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