气候变化领域集成服务门户(CCPortal): A note on some uncertainties associated with Thornthwaite's aridity index introduced by using different potential evapotranspiration methods

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DOI	10.1016/j.atmosres.2021.105727
	A note on some uncertainties associated with Thornthwaite's aridity index introduced by using different potential evapotranspiration methods
	Proutsos N.D.; Tsiros I.X.; Nastos P.; Tsaousidis A.
发表日期	2021
ISSN	0169-8095
卷号	260
英文摘要	Potential evapotranspiration (PET) is a key parameter for climate classification and aridity assessment. The widely used UNEP (1992) classification system is based on the estimation of the aridity index AI, which requires annual average values of precipitation P and PET. For the calculation of PET the Thornthwaite's (1948) formula is, in principle, suggested. Recent studies use more advanced and accurate methods for PET estimation but apply to AI the same thresholds proposed by UNEP for aridity classification. This work deals with the uncertainties introduced by the use of different PET methods in the estimation of the aridity index AI. Specifically, the Hargreaves-Samani (HS) method and four of its modifications, three modifications of Thornthwaite's formula and the equation of Hamon, are evaluated against the widely used Thornthwaite's original method, by assessing their impact on the AI. Climatic data as monthly average values of at least 30 years of measurements from 122 stations in the Greek peninsula are used. Results show that AI is highly affected by the PET method adopted, resulting thus to changes in climatic classification of a region. Further, results imply the need for an adjustment of the threshold values that determine aridity classes according to the method each time adopted. Therefore, new threshold values for the aridity classes are developed and presented in this work. The proposed threshold values cover a range of sites that belong to semi-arid SA, sub-humid SH and humid H aridity classes of the Greek peninsula. © 2021 Elsevier B.V.
英文关键词	Aridity index; Greece; Hamon; Hargreaves – Samani; Potential Evapotranspiration PET; Thornthwaite methods
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/236680
作者单位	Institute of Mediterranean Forest Ecosystems, Hellenic Agricultural Organization “Demeter”, Terma Alkmanos, Athens, 11528, Greece; Laboratory of Meteorology, Agricultural University of Athens, Iera Odos 75, Athens, 11855, Greece; Laboratory of Climatology and Atmospheric Environment, National and Kapodistrian University of Athens, University Campus, Athens, 15784, Greece
推荐引用方式 GB/T 7714	Proutsos N.D.,Tsiros I.X.,Nastos P.,et al. A note on some uncertainties associated with Thornthwaite's aridity index introduced by using different potential evapotranspiration methods[J],2021,260.
APA	Proutsos N.D.,Tsiros I.X.,Nastos P.,&Tsaousidis A..(2021).A note on some uncertainties associated with Thornthwaite's aridity index introduced by using different potential evapotranspiration methods.Atmospheric Research,260.
MLA	Proutsos N.D.,et al."A note on some uncertainties associated with Thornthwaite's aridity index introduced by using different potential evapotranspiration methods".Atmospheric Research 260(2021).