globalchange  > 气候减缓与适应
DOI: 10.1007/s10584-013-1046-3
Scopus记录号: 2-s2.0-84896711664
论文题名:
Detection of long-term trends in monthly hydro-climatic series of Colombia through Empirical Mode Decomposition
作者: Carmona A.M.; Poveda G.
刊名: Climatic Change
ISSN: 0165-0009
EISSN: 1573-1480
出版年: 2014
卷: 123, 期:2
起始页码: 301
结束页码: 313
语种: 英语
英文关键词: Climate change ; Climate variability ; Colombia ; Empirical Mode Decomposition ; Long term trends
Scopus关键词: Climate variability ; Colombia ; Empirical Mode Decomposition ; Empirical mode decomposition method ; Geographical patterns ; Intrinsic Mode functions ; Long-term trend ; Statistical significance ; Climate change ; Signal processing ; autocorrelation ; climate change ; climate effect ; detection method ; empirical analysis ; hydrometeorology ; long-term change ; rainfall ; river discharge ; time series analysis ; tropical region ; Colombia ; Pacific Coast [Colombia] ; Pacific Coast [South America]
英文摘要: We test for the existence of long-term trends in 25- to 50-year long series of monthly rainfall, average river discharges, and minimum air temperatures in Colombia. The Empirical Mode Decomposition method is used as a mathematical filter to decompose a given time series into a finite number of intrinsic mode functions, assuming the coexistence of different frequency oscillatory modes in the series, and that the residual captures the likely existing long-term trends. The Mann-Kendall test for autocorrelated data is used to assess the statistical significance of the identified trends, and the Sen test is used to quantify their magnitudes. Results show that 62 % of river discharge series exhibit significant decreasing trends between 0.01-1.92 m 3 s -1 per year, which are highly consistent downstream albeit with different ratios between the trend magnitudes and mean discharges. Most minimum temperature series (87 %) exhibit increasing trends (0.01-0.08 °Cyr -1). Results for precipitation series are inconclusive owing to the mixing between increasing trends (41 %, between 0.1-7.0 mm yr -1) and decreasing trends (44 %, between 0.1-7.4 mm yr -1), with no clear-cut geographical pattern, except for the increasing trend identified along the Pacific region, consistent with the increasing trend identified in the strength of the Chocó low-level wind jet off the Pacific coast of Colombia, an important moisture source of continental precipitation. Our results contribute to discerning between signals of climate change and climate variability in tropical South America. © 2014 Springer Science+Business Media Dordrecht.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/84759
Appears in Collections:气候减缓与适应
气候变化事实与影响

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作者单位: Department of Geosciences and Environment, Universidad Nacional de Colombia, Sede Medellín, Carrera 80 x Calle 65. Bloque M2-203, Medellín, Colombia; Department of Geosciences and Environment, Universidad Nacional de Colombia, Sede Medellín, Carrera 80 x Calle 65. Bloque M2-315, Medellín, Colombia

Recommended Citation:
Carmona A.M.,Poveda G.. Detection of long-term trends in monthly hydro-climatic series of Colombia through Empirical Mode Decomposition[J]. Climatic Change,2014-01-01,123(2)
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