DOI: 10.1016/j.atmosres.2017.11.015
Scopus记录号: 2-s2.0-85034022712
论文题名: Modelling extreme dry spells in the Mediterranean region in connection with atmospheric circulation
作者: Tramblay Y. ; Hertig E.
刊名: Atmospheric Research
ISSN: 1698095
出版年: 2018
卷: 202 起始页码: 40
结束页码: 48
语种: 英语
英文关键词: Dry spells
; ERA-20C
; Extreme
; GEV
; Mediterranean
Scopus关键词: Atmospheric pressure
; Climate change
; Climatology
; Drought
; Gages
; Groundwater
; Groundwater resources
; Meteorology
; Precipitation (meteorology)
; Rain
; Rain gages
; Water resources
; Atmospheric circulation
; Dry spells
; Extreme
; Generalized extreme value (GEV) distributions
; Location and scale parameters
; Mediterranean
; North atlantic oscillation indices
; Regional classifications
; Atmospheric humidity
; annual variation
; atmospheric circulation
; climate classification
; climate modeling
; drought
; extreme event
; Mediterranean environment
; North Atlantic Oscillation
; precipitation intensity
; regional climate
; winter
; Mediterranean Region
; Parlatoria ziziphi
英文摘要: Long droughts periods can affect the Mediterranean region during the winter season, when most of annual precipitation occurs, and consequently have strong impacts on agriculture, groundwater levels and water resources. The goal of this study is to model annual maximum dry spells lengths (AMDSL) that occur during the extended winter season (October to April). The spatial patterns of extreme dry spells and their relationships with large-scale atmospheric circulation were first investigated. Then, AMDSL were modelled using Generalized Extreme Value (GEV) distributions incorporating climatic covariates, to evaluate the dependences of extreme dry spells to synoptic patterns using an analogue approach. The data from a network of 160 rain gauges having daily precipitation measurements between 1960 and 2009 are considered together with the ERA-20C reanalysis of the 20th century to provide atmospheric variables (geopotential heights, humidity, winds). A regional classification of both the occurrence and the duration of AMDSL helped to distinguish three spatially contiguous regions in which the regional distributions were found homogeneous. From composite analysis, significant positive anomalies in geopotential height (Z500) and negative anomalies in zonal wind (U850) and relative and specific humidity (S850, R850) were found to be associated with AMDSL in the three regions and provided the reference to build analogue days. Finally, non-stationary GEV models have been compared, in which the location and scale parameters are related to different atmospheric indices. Results indicates, at the whole Mediterranean scale, that positives anomalies of the North Atlantic Oscillation index and to a lesser extent the Mediterranean Oscillation index are linked to longer extreme dry spells in the majority of stations. For the three regions identified, the frequency of U850 negative anomalies over North Africa is significantly associated with the magnitude of AMDSL. AMDL are also associated with the frequency of S850 negative anomalies for the southeastern region, and with positive Z500 anomalies for the Western and North-eastern Mediterranean regions. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/108971
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: HSM (IRD, CNRS, Univ. Montpellier), France; Institute of Geography, University of Augsburg, Germany
Recommended Citation:
Tramblay Y.,Hertig E.. Modelling extreme dry spells in the Mediterranean region in connection with atmospheric circulation[J]. Atmospheric Research,2018-01-01,202