globalchange  > 气候变化与战略
DOI: 10.5194/hess-23-2379-2019
论文题名:
Contribution of low-frequency climatic-oceanic oscillations to streamflow variability in small; coastal rivers of the Sierra Nevada de Santa Marta (Colombia)
作者: Restrepo J.C.; Higgins A.; Escobar J.; Ospino S.; Hoyos N.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2019
卷: 23, 期:5
起始页码: 2379
结束页码: 2400
语种: 英语
Scopus关键词: Spectroscopy ; Spectrum analysis ; Stream flow ; Tropics ; Wavelet analysis ; Wavelet transforms ; Cross-wavelet transform ; Hydrological variability ; Low frequency oscillations ; Pacific decadal oscillation ; Quasi-stationary state ; Streamflow variability ; Temporal characteristics ; Variability patterns ; Rivers ; atmosphere-ocean coupling ; climate oscillation ; mountain region ; oscillation ; spectral analysis ; spectrum ; streamflow ; wavelet analysis ; California ; Colombia ; Magdalena [Colombia] ; Santa Marta ; Sierra Nevada [California] ; South America ; United States
英文摘要: This study evaluated the influence of low-frequency oscillations, that are linked to large-scale oceanographic-atmospheric processes, on streamflow variability in small tropical coastal mountain rivers of the Sierra Nevada de Santa Marta, Colombia. We used data from six rivers that had > 32 years of complete, continuous monthly streamflow records. This investigation employed spectral analyses to (1) explore temporal characteristics of streamflow variability, (2) estimate the net contribution to the energy spectrum of low-frequency oscillations to streamflow anomalies, and (3) analyze the linkages between streamflow anomalies and large-scale, low-frequency oceanographic-atmospheric processes. Wavelet analyses indicate that the 8-12-year component exhibited a quasi-stationary state, with a peak of maximum power between 1985 and 2005. These oscillations were nearly in phase in all rivers. Maximum power peaks occurred for the Palomino and Rancheria rivers in 1985 and 1995, respectively. The wavelet spectrum highlights a change in river variability patterns between 1995 and 2015, characterized by a shift towards the low-frequency oscillations' domain (8-12 years). The net contribution of these oscillations to the energy spectrum was as high as 51 %, a value much larger than previously thought for rivers in northwestern South America. The simultaneous occurrence of hydrologic oscillations, as well as the increase in the amplitude of the 8-12-year band, defined periods of extremely anomalous wet seasons during 1989-1990, 1998-2002 and 2010-2011, reflecting the role of low-frequency oscillations in modulating streamflow variability in these rivers. Cross-wavelet transform and wavelet coherence revealed high common powers and significant coherences in low-frequency bands (>96 months) between streamflow anomalies and Atlantic Meridional Oscillation (AMO), Pacific Decadal Oscillation (PDO) and the Tropical North Atlantic Index (TNA). These results show the role of large-scale, low-frequency oceanographic-climate processes in modulating the long-term hydrological variability of these rivers. © Author(s) 2019.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162970
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作者单位: Restrepo, J.C., Grupo de Investigación en Geociencias GEO4, Departamento de Física y Geociencias, Universidad del Norte, Kmĝ5 vía Puerto Colombia, Barranquilla, Colombia; Higgins, A., Grupo de Investigación en Geociencias GEO4, Departamento de Física y Geociencias, Universidad del Norte, Kmĝ5 vía Puerto Colombia, Barranquilla, Colombia; Escobar, J., Departamento de Ingeniería Civil y Ambiental, Universidad del Norte, kmĝ5 vía Puerto Colombia, Barranquilla, Colombia, Smithsonian Tropical Research Institute, P.O. Box 0843-03092, Balboa, Ancon, Panama; Ospino, S., Grupo de Investigación en Geociencias GEO4, Departamento de Física y Geociencias, Universidad del Norte, Kmĝ5 vía Puerto Colombia, Barranquilla, Colombia; Hoyos, N., Departamento de Historia y Ciencias Sociales, Universidad del Norte, kmĝ5 vía Puerto Colombia, Barranquilla, Colombia

Recommended Citation:
Restrepo J.C.,Higgins A.,Escobar J.,et al. Contribution of low-frequency climatic-oceanic oscillations to streamflow variability in small; coastal rivers of the Sierra Nevada de Santa Marta (Colombia)[J]. Hydrology and Earth System Sciences,2019-01-01,23(5)
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