DOI: 10.1007/s00382-017-3661-6
Scopus记录号: 2-s2.0-85017190783
论文题名: Variability and trends of wet season temperature in the Sudano-Sahelian zone and relationships with precipitation
作者: Oueslati B. ; Camberlin P. ; Zoungrana J. ; Roucou P. ; Diallo S.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 50, 期: 2018-03-04 起始页码: 1067
结束页码: 1090
语种: 英语
英文关键词: Burkina Faso
; Climate change
; Rainfall
; Sahel
; Temperature
; Trends
Scopus关键词: climate change
; evapotranspiration
; precipitation (climatology)
; seasonal variation
; sensible heat flux
; temperature anomaly
; trend analysis
; Burkina Faso
; Sahel [Sub-Saharan Africa]
英文摘要: The relationships between precipitation and temperature in the central Sudano-Sahelian belt are investigated by analyzing 50 years (1959–2008) of observed temperature (Tx and Tn) and rainfall variations. At daily time-scale, both Tx and Tn show a marked decrease as a response to rainfall occurrence, with a strongest departure from normal 1 day after the rainfall event (−0.5 to −2.5 °C depending on the month). The cooling is slightly larger when heavy rainfall events (>5 mm) are considered. The temperature anomalies weaken after the rainfall event, but are still significant several days later. The physical mechanisms accounting for the temperature response to precipitation are analysed. The Tx drop is accounted for by reduced incoming solar radiation associated with increased cloud cover and increased surface evaporation following surface moistening. The effect of evaporation becomes dominant a few days after the rainfall event. The reduced daytime heat storage and the subsequent sensible heat flux result in a later negative Tn anomaly. The effect of rainfall variations on temperature is significant for long-term warming trends. The rainfall decrease experienced between 1959 and 2008 accounts for a rainy season Tx increase of 0.15 to 0.3 °C, out of a total Tx increase of 1.3 to 1.5 °C. These results have strong implications on the assessment of future temperature changes. The dampening or amplifying effects of precipitation are determined by the sign of future precipitation trends. Confidence on temperature changes under global warming partly depend on the robustness of precipitation projections. © 2017, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109445
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Centre de Recherches de Climatologie/Biogéosciences, UMR 6282 CNRS, Univ. Bourgogne Franche-Comté, Dijon, 21000, France; ASECNA, CP 806, Bissau, Guinea-Bissau
Recommended Citation:
Oueslati B.,Camberlin P.,Zoungrana J.,et al. Variability and trends of wet season temperature in the Sudano-Sahelian zone and relationships with precipitation[J]. Climate Dynamics,2018-01-01,50(2018-03-04)