DOI: 10.1175/JCLI-D-16-0547.1
Scopus记录号: 2-s2.0-85028505574
论文题名: Physical factors influencing regional precipitation variability attributed using an airmass trajectory method
作者: de Leeuw J. ; Methven J. ; Blackburn M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 18 起始页码: 7359
结束页码: 7378
语种: 英语
Scopus关键词: Atmospheric temperature
; Boundary layers
; Lagrange multipliers
; Location
; Precipitation (chemical)
; Storms
; Surface properties
; Temperature
; Trajectories
; Atlantic multidecadal oscillations
; Extratropical cyclones
; Interannual variability
; Lagrangian circulation/transport
; Multidecadal variability
; Precipitation variability
; Regional precipitation variability
; Surface temperature variation
; Precipitation (meteorology)
英文摘要: A novel Lagrangian framework is developed to attribute monthly precipitation variability to physical processes. Precipitation variability is partitioned into a combination of five factors: airmass origin location, origin surface temperature variation, ascent intensity, mass fraction of ascending air, and the number of ''wet'' analysis times per month [.1mm(6 h)-1]. Precipitation in a target region is linked to ''origin'' locations of air masses where the water vapor mixing ratio was last set by boundary layer moistening and is a maximumalong back trajectories. Applying the technique to the England and Wales region, the factors together account for 83%-89% of the observed summer precipitation variability. The dominant contributor is the number of wet analyses, which is shown to be associated with cyclone statistics. The wettest summer months are mainly associated with anomalous cyclone duration rather than the number of cyclones. In addition, surface temperature and saturation humidity at the origin locations are found to be below their climatological averages (1979-2013). Therefore, the direct thermodynamic effect of anomalous surface temperature on marine boundary layer humidity acts to reduce monthly precipitation anomalies. The decadal precipitation change between phases of the Atlantic multidecadal oscillation is approximately 20% of the interannual variability between summer months. Changes in cyclone statistics have an effect 6 times larger than the direct thermodynamic factor in both monthly and decadal precipitation variability. © 2017 American Meteorological Society. 资助项目: NCAS, National Centre for Atmospheric Science
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48715
Appears in Collections: 气候减缓与适应 气候变化与战略
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作者单位: Department of Meteorology, University of Reading, Reading, United Kingdom; National Centre for Atmospheric Science, University of Reading, Reading, United Kingdom
Recommended Citation:
de Leeuw J.,Methven J.,Blackburn M.. Physical factors influencing regional precipitation variability attributed using an airmass trajectory method[J]. Journal of Climate,2017-01-01,30(18)