DOI: 10.1002/2013JD020868
论文题名: Probing the precipitation life cycle by iterative rain cell tracking
作者: Moseley C. ; Berg P. ; Haerter J.O.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 24 起始页码: 13361
结束页码: 13370
语种: 英语
英文关键词: Clausius-Clapeyron relation
; convective life cycle
; extreme precipitation
; radar analysis
; rain cell tracking
Scopus关键词: Atmospheric temperature
; Cytology
; Iterative methods
; Life cycle
; Radar
; Surface properties
; Clausius Clapeyron relation
; Convective rain cells
; Extreme precipitation
; Moving reference frame
; Precipitation extremes
; Radar analysis
; Rain cells
; Surface temperatures
; Rain
; convergence
; data set
; dissipation
; environmental monitoring
; Lagrangian analysis
; life cycle
; precipitation (climatology)
; precipitation intensity
; spatiotemporal analysis
; surface temperature
; wind velocity
英文摘要: Monitoring the life cycle of convective rain cells requires a Lagrangian viewpoint where the observer moves with the dominant background flow. To adopt such a moving reference frame, we design, validate, and apply a simple rain cell tracking method - which we term iterative rain cell tracking (IRT) - for spatio-temporal precipitation data. IRT iteratively identifies the formation and dissipation of rain cells and determines the large-scale flow. The iteration is repeated until reaching convergence. As validated using reanalysis wind speeds, repeated iterations lead to substantially increased agreement of the background flow field and an increased number of complete tracks. Our method is thereby able to monitor the growth and intensity profiles of rain cells and is applied to a high-resolution (5 min and 1×1 km2) data set of radar-derived rainfall intensities over Germany. We then combine this data set with surface temperature observations and synoptic observations to group tracks according to convective and stratiform conditions. Convective tracks show clear life cycles in intensity, with peaks shifted off-center toward the beginning of the track, whereas stratiform tracks have comparatively featureless intensity profiles. Our results show that the convective life cycle can lead to convection-dominating precipitation extremes at short time scales, while track-mean intensities may vary much less between the two types. The observed features become more pronounced as surface temperature increases, and in the case of convection even exceeded the rates expected from the Clausius-Clapeyron relation. Key Points Convective rain intensities can exceed stratiform rain on short timescales Temperature affects convection life cycle Stratiform events lack life cycle ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63078
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Max Planck Institute for Meteorology, Bundesstr. 52, DE-20146 Hamburg, Germany; Helmholtz Zentrum Geesthacht, Climate Service Center, Hamburg, Germany; Hydrology Unit, Swedish Meteorological and Hydrological Institute, Norrköping, Sweden; Center for Models of Life, Niels Bohr Institute, Copenhagen, Denmark
Recommended Citation:
Moseley C.,Berg P.,Haerter J.O.. Probing the precipitation life cycle by iterative rain cell tracking[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(24)