DOI: 10.1007/s10584-014-1100-9
Scopus记录号: 2-s2.0-84902290858
论文题名: Precipitation variability and trends in Ghana: An intercomparison of observational and reanalysis products
作者: Manzanas R. ; Amekudzi L.K. ; Preko K. ; Herrera S. ; Gutiérrez J.M.
刊名: Climatic Change
ISSN: 0165-0009
EISSN: 1573-1480
出版年: 2014
卷: 124, 期: 4 起始页码: 805
结束页码: 819
语种: 英语
Scopus关键词: Precipitation (meteorology)
; Satellites
; Extreme precipitation
; Interannual variability
; Intercomparisons
; Mann-Kendall trends
; Meteorological agency
; Poor performance
; Precipitation variability
; Pseudo-observations
; Gages
; correlation
; data set
; observational method
; precipitation (climatology)
; satellite data
; satellite imagery
; Ghana
英文摘要: Inter-annual variability and trends of annual/seasonal precipitation totals in Ghana are analyzed considering different gridded observational (gauge- and/or satellite-based) and reanalysis products. A quality-controlled dataset formed by fourteen gauges from the Ghana Meteorological Agency (GMet) is used as reference for the period 1961-2010. Firstly, a good agreement is found between GMet and all the observational products in terms of variability, with better results for the gauge-based products-correlations in the range of 0.7-1.0 and nearly null biases-than for the satellite-gauge merged and satellite-derived products. In contrast, reanalyses exhibit a very poor performance, with correlations below 0.4 and large biases in most of the cases. Secondly, a Mann-Kendall trend analysis is carried out. In most cases, GMet data reveal the existence of predominant decreasing (increasing) trends for the first (second) half of the period of study, 1961-1985 (1986-2010). Again, observational products are shown to reproduce well the observed trends-with worst results for purely satellite-derived data-whereas reanalyses lead in general to unrealistic stronger than observed trends, with contradictory results (opposite signs for different reanalyses) in some cases. Similar inconsistencies are also found when analyzing trends of extreme precipitation indicators. Therefore, this study provides a warning concerning the use of reanalysis data as pseudo-observations in Ghana. © 2014 Springer Science+Business Media Dordrecht. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/84917
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: Grupo de Meteorología, Instituto de Física de Cantabria, CSIC-Univ. de Cantabria, Avda. de los Castros, s/n, 39005 Santander, Spain; Meteorology and Climate Science Unit, Department of Physics, Kwame Nkrumah University of Science and Technology (KNUST), Kumasi, Ghana; Grupo de Meteorología, Departamento de Matemática Aplicada y Ciencias de la Computación, Univ. de Cantabria, Avda. de los Castros s/n, 39005 Santander, Spain
Recommended Citation:
Manzanas R.,Amekudzi L.K.,Preko K.,et al. Precipitation variability and trends in Ghana: An intercomparison of observational and reanalysis products[J]. Climatic Change,2014-01-01,124(4)