DOI: 10.1007/s00382-015-2650-x
Scopus记录号: 2-s2.0-84933055420
论文题名: Hydrological extremes in the Aksu-Tarim River Basin: Mid-latitude dynamics
作者: Borth H. ; Tao H. ; Fraedrich K. ; Schneidereit A. ; Zhu X.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 46, 期: 2017-07-08 起始页码: 2039
结束页码: 2050
语种: 英语
英文关键词: Aksu tarim river basin
; Cyclone tracks
; Drought and wetness
; Geopotential height
; Mid-latitude dynamics
; Potential vorticity front
; Standardized precipitation index
英文摘要: Analyses of precipitation (1961–2010) from 39 meteorological stations in the Tarim River Basin revealed a trend from dryer towards wetter conditions induced by an increase of the number of wet extremes. A first (1961–1986) and second (1987–2010) period are the basis for a dynamical analysis of changing drought and wetness extremes which are closely related to cyclonic activity over the European continent and circulation anomalies in the Northern Hemisphere mid-latitudes. Wave train, cyclone tracks, water flux and potential vorticity (PV) front analysis of the wet and dry months show the following result: (1) The extreme wet and dry cases in winter and summer are characterized by distinguished wave train patterns upstream of the Tarim River Basin. All wave trains originate in the Atlantic–European sector pointing towards wave train dynamics as one possible mechanism underlying the connection patterns observed. (2) The selected extreme cases show that exceptional precipitation events can be connected to characteristic cyclone tracks and a PV front in the upper troposphere even if cyclone tracks never cross the Tarim Basin. Extremely wet winters are characterized by cyclone tracks close to the western and northern boundary of the Tarim Basin whereas, during extremely dry winters, such cyclone tracks are absent. Wet summers are characterized by long-lived cyclonic anomalies at the north western corner of the Tarim River Basin [see also (3)]. During dry summers such anomalies are absent. (3) On a more local level the hydrological extreme events are linked to special dynamical structures of the upper tropospheric PV front. In winter strong (extreme) precipitation is connected to a strong non-linear wave development or a wave-breaking event over the Tarim River Basin. Together with non-linear wave development moisture and precipitation areas are advected towards the Tarim River Basin. In dry winters the upper tropospheric PV front is much more zonally oriented and wave-breaking is less frequent. Strong precipitation events are connected to strong breaking events and to the formation of long-lived nearly stationary cyclones over or north of the Tarim River Basin during extremely wet summer months. © The Author(s) 2015. 资助项目: NSFC, National Natural Science Foundation of China
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53673
Appears in Collections: 过去全球变化的重建
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作者单位: State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, China; Center for Earth System Research and Sustainability, CliSAP, University of Hamburg, Hamburg, Germany; Max Planck Institute for Meteorology, Hamburg, Germany; Leibniz-Institute of Atmospheric Physics, Kühlungsborn, Germany
Recommended Citation:
Borth H.,Tao H.,Fraedrich K.,et al. Hydrological extremes in the Aksu-Tarim River Basin: Mid-latitude dynamics[J]. Climate Dynamics,2016-01-01,46(2017-07-08)