DOI: 10.1002/joc.6023
Scopus记录号: 2-s2.0-85061900666
论文题名: Is equatorial Africa getting wetter or drier? Insights from an evaluation of long-term, satellite-based rainfall estimates for western Uganda
作者: Diem J.E. ; Konecky B.L. ; Salerno J. ; Hartter J.
刊名: International Journal of Climatology
ISSN: 8998418
出版年: 2019
语种: 英语
英文关键词: double-mass curve
; equatorial Africa
; inhomogeneity
; rainfall
; satellite-based estimates
; validation
Scopus关键词: Chirp modulation
; Climatology
; Neural networks
; Rain gages
; Satellites
; Soil moisture
; Change-point analysis
; Double mass
; Equatorial Africa
; Ground based measurement
; Inhomogeneities
; Precipitation estimation from remotely sensed information
; Rainfall climatologies
; validation
; Rain
英文摘要: Long-term trends in equatorial African rainfall have proven difficult to determine because of a dearth in ground-measured rainfall data. Multiple, satellite-based products now provide daily rainfall estimates from 1983 to the present at relatively fine spatial resolutions, but in order to assess trends in rainfall, they must be validated alongside ground-based measurements. The purpose of this paper is twofold: (a) to assess the accuracy of four rainfall products covering the past several decades in western Uganda; and (b) to ascertain recent, multi-decadal trends in annual rainfall for the region. The four products are African Rainfall Climatology Version 2 (ARC2), Climate Hazards Group InfraRed Precipitation with Stations (CHIRPS), Precipitation Estimation from Remotely Sensed Information using Artificial Neural Networks–Climate Data Record (PERSIANN-CDR), and TAMSAT African Rainfall Climatology And Timeseries (TARCAT). The bias and accuracy of 10-day, monthly, and seasonal rainfall totals of the four products were assessed using approximately 10 years of data from 10 rain gauges. The homogeneity of the products over multiple time periods was assessed using change-point analysis. The accuracy of the four products increased with an increase in temporal scale, and CHIRPS was the only product that could be considered sufficiently accurate at estimating seasonal rainfall totals throughout most of the region. TARCAT tended to underestimate totals, and ARC2 and PERSIANN were in general the least accurate products. Only annual rainfall estimates from CHIRPS and TARCAT were significantly correlated with ground-measured rainfall totals. TARCAT was the most homogeneous product, while ARC2, CHIRPS, and PERSIANN had significant negative change points that caused a drying bias over the 1983–2016 period. After adjusting the satellite-based rainfall estimates based on the timing and magnitude of the change points, annual rainfall totals derived from all four products indicated that western Uganda experienced significantly increasing rainfall from 1983 to 2016. © 2019 Royal Meteorological Society Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/116615
Appears in Collections: 全球变化的国际研究计划
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作者单位: Department of Geosciences, Georgia State University, Atlanta, GA, United States; Department of Earth and Planetary Sciences, Washington University of St. Louis, St. Louis, MO, United States; Department of Human Dimensions of Natural Resources, Colorado State University, Fort Collins, CO, United States; Environmental Studies Program, University of Colorado Boulder, Boulder, CO, United States
Recommended Citation:
Diem J.E.,Konecky B.L.,Salerno J.,et al. Is equatorial Africa getting wetter or drier? Insights from an evaluation of long-term, satellite-based rainfall estimates for western Uganda[J]. International Journal of Climatology,2019-01-01