DOI: 10.1175/JCLI-D-11-00406.1
Scopus记录号: 2-s2.0-84865171846
论文题名: Colorado river basin hydroclimatic variability
作者: Nowak K. ; Hoerling M. ; Rajagopalan B. ; Zagona E.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 12 起始页码: 4389
结束页码: 4403
语种: 英语
Scopus关键词: Arizona
; Atlantic multidecadal oscillations
; Colorado River Basin
; Dominant mode
; Flow variability
; Hydroclimatic variability
; Low frequency
; Low frequency variability
; Model experiments
; Multidecadal variability
; Precipitation data
; Sea surface temperature anomalies
; SST anomalies
; Strong link
; Time-scales
; Spectrum analysis
; Stream flow
; Watersheds
; climate variation
; decadal variation
; hydrometeorology
; runoff
; sea surface temperature
; spectral analysis
; streamflow
; temperature anomaly
; Arizona
; Colorado Basin [North America]
; Lees Ferry
; United States
英文摘要: An analysis of annual hydroclimatic variability in the Upper Colorado River basin (UCRB) for the period of 1906-2006 was performed to understand the dominant modes of multidecadal variability. First, waveletbased spectral analysis was employed for streamflow at Lees Ferry, Arizona (aggregate location for UCRB flow), which identified two significant modes: a "low frequency" (64-yr period) mode and a strong "decadal" (15-yr period) component active only in recent decades. Subsequent investigation of temperature and precipitation data for the UCRB indicated that the low-frequency variability is associated with temperature via modulation of runoff efficiency while the decadal is strongly tied to moisture delivery. Simple hydrology and climate model experiments are also provided to support the aforementioned findings. Correlation of UCRB precipitation with global sea surface temperature (SST) anomalies showed a strong link with the equatorial and northern Pacific during periods of heightened variability of the decadal mode. The correlation of UCRB temperature with global SST anomalies showed strongest values in the Atlantic consistent with the Atlantic multidecadal oscillation mode. Wavelet spectral analysis of paleo-reconstructed streamflow at Lees Ferry shows both the low-frequency and decadal flow variability features. Furthermore, the strength of the decadal mode is modulated at an;75-yr time scale, and these are consistent with epochal variations of overall streamflow variance. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52382
Appears in Collections: 气候变化事实与影响
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作者单位: Bureau of Reclamation, Lower Colorado Region, Boulder City, NV, United States; NOAA/Earth System Research Laboratory/Physical Sciences Division, Boulder, CO, United States; Cooperative Institute for Research in Environmental Sciences, Department of Civil, Architectural, and Environmental Engineering, University of Colorado, Boulder, CO, United States; Center for Advanced Decision Support for Water and Environmental Systems, Department of Civil, Architectural, and Environmental Engineering, University of Colorado, Boulder, CO, United States
Recommended Citation:
Nowak K.,Hoerling M.,Rajagopalan B.,et al. Colorado river basin hydroclimatic variability[J]. Journal of Climate,2012-01-01,25(12)