DOI: 10.1175/JCLI-D-11-00665.1
Scopus记录号: 2-s2.0-84870014656
论文题名: Relative contributions of synoptic and low-frequency eddies to time-mean atmospheric moisture transport, including the role of atmospheric rivers
作者: Newman M. ; Kiladis G.N. ; Weickmann K.M. ; Ralph M.F. ; Sardeshmukh P.D.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 21 起始页码: 7341
结束页码: 7361
语种: 英语
Scopus关键词: Anthropogenic changes
; Atlantic Ocean
; Atmosphere-ocean interactions
; Atmospheric anomaly
; Atmospheric circulation
; Atmospheric moisture
; Atmospheric transport
; Atmospheric variability
; Australia
; Climate variability
; Compositing
; Extratropical
; Extratropics
; Hydrologic cycles
; Hydrological cycles
; Lateral mixing
; Low frequency variability
; Low latitudes
; Low-level winds
; Midlatitudes
; Moisture budget
; Moisture plumes
; Moisture transport
; Ocean basins
; Poleward moisture transport
; Reanalysis
; Relative contribution
; Synoptic variability
; Time-scales
; Budget control
; Climatology
; Digital storage
; Moisture
; Atmospheric movements
; air-sea interaction
; atmospheric circulation
; atmospheric moisture
; climate variation
; extratropical environment
; hydrological cycle
; meridional circulation
; moisture flux
; moisture transfer
; synoptic meteorology
; Atlantic Ocean
; Atlantic Ocean (Northeast)
; Pacific Ocean
; Pacific Ocean (Northeast)
英文摘要: The relative contributions to mean global atmospheric moisture transport by both the time-mean circulation and by synoptic and low-frequency (periods greater than 10 days) anomalies are evaluated from the vertically integrated atmospheric moisture budget based on 40 yr of "chi corrected" NCEP-NCAR reanalysis data. In the extratropics, while the time-mean circulation primarily moves moisture zonally within ocean basins, low-frequency and synoptic anomalies drive much of the mean moisture transport both from ocean to land and toward the poles. In particular, during the cool-season low-frequency variability is the largest contributor to mean moisture transport into southwestern North America, Europe, and Australia. While some low-frequency transport originates in low latitudes, much is of extratropical origin due to largescale atmospheric anomalies that extract moisture from the northeast Pacific and Atlantic Oceans. Lowfrequency variability is also integral to the Arctic (latitudes >70°N) mean moisture budget, especially during summer, when it drives mean poleward transport from relatively wet high-latitude continental regions. Synoptic variability drives about half of the mean poleward moisture transport in the midlatitudes of both hemispheres, consistent with simple "lateral mixing" arguments. Extratropical atmospheric transport is also particularly focused within "atmospheric rivers" (ARs), relatively narrow poleward-moving moisture plumes associated with frontal dynamics. AR moisture transport, defined by compositing fluxes over those locations and times where column-integrated water vapor and poleward low-level wind anomalies are both positive, represents most of the total extratropical meridional moisture transport. These results suggest that understanding potential anthropogenic changes in the earth's hydrological cycle may require understanding corresponding changes in atmospheric variability, especially on low-frequency time scales. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52143
Appears in Collections: 气候变化事实与影响
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作者单位: CIRES Climate Diagnostics Center, University of Colorado, Boulder, CO, United States; Physical Sciences Division, NOAA/Earth System Research Laboratory, Boulder, CO, United States
Recommended Citation:
Newman M.,Kiladis G.N.,Weickmann K.M.,et al. Relative contributions of synoptic and low-frequency eddies to time-mean atmospheric moisture transport, including the role of atmospheric rivers[J]. Journal of Climate,2012-01-01,25(21)