DOI: 10.1175/JCLI-D-13-00365.1
Scopus记录号: 2-s2.0-84896936083
论文题名: Timing and patterns of the ENSO signal in Africa over the last 30 years: Insights from Normalized Difference Vegetation Index Data
作者: Philippon N. ; Martiny N. ; Camberlin P. ; Hoffman M.T. ; Gond V.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 7 起始页码: 2509
结束页码: 2532
语种: 英语
Scopus关键词: Rain
; Sun
; Correlation patterns
; Democratic Republic of Congo
; Negative correlation
; Normalized difference vegetation index
; Normalized difference vegetation index datum
; Positive correlations
; Spatial resolution
; Vegetation dynamics
; Climatology
; El Nino-Southern Oscillation
; intertropical convergence zone
; NDVI
; remote sensing
; vegetation dynamics
; Africa
英文摘要: A more complete picture of the timing and patterns of the ENSO signal during the seasonal cycle for the whole of Africa over the three last decades is provided using the normalized difference vegetation index (NDVI). Indeed, NDVI has a higher spatial resolution and is more frequently updated than in situ climate databases, and highlights the impact of ENSO on vegetation dynamics as a combined result of ENSO on rainfall, solar radiation, and temperature. The month-by-month NDVI-Niño-3.4 correlation patterns evolve as follows. From July to September, negative correlations are observed over the Sahel, the Gulf of Guinea coast, and regions from the northern Democratic Republic of Congo to Ethiopia. However, they are not uniform in space and are moderate (̃0.3). Conversely, positive correlations are recorded over the winter rainfall region of South Africa. In October-November, negative correlations over Ethiopia, Sudan, and Uganda strengthen while positive correlations emerge in the Horn of Africa and in the southeast coast of South Africa. By December with the settlement of the ITCZ south of the equator, positive correlations over the Horn of Africa spread southward and westward while negative correlations appear over Mozambique, Zimbabwe, and South Africa. This pattern strengthens and a dipole at 18°S is well established in February-March with reduced (enhanced) greenness during ENSO years south (north) of 18°S. At the same time, at ~2°N negative correlations spread northward. Last, from April to June negative correlations south of 18°S spread to the north (to 10°S) and to the east (to the south of Tanzania) © 2014 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51046
Appears in Collections: 气候变化事实与影响
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作者单位: Centre de Recherches de Climatologie, Biogéosciences UMR6282 CNRS, Université de Bourgogne, Dijon, France; Plant Conservation Unit, Department of Biological Sciences, University of Cape Town, Rondebosch, South Africa; CIRAD, ES, UPR 105 Biens et Services des Écosystèmes Forestiers Tropicaux, Campus de Baillarguet, Montpellier, France
Recommended Citation:
Philippon N.,Martiny N.,Camberlin P.,et al. Timing and patterns of the ENSO signal in Africa over the last 30 years: Insights from Normalized Difference Vegetation Index Data[J]. Journal of Climate,2014-01-01,27(7)