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<title lang=en>Analysis of the diurnal cycles for a better understanding of the mean annual cycle of forests greenness in Central Africa.</title>
<creator>Philippon, Nathalie</creator>
<creator>De Lapparent, B.</creator>
<creator>Gond, Valery</creator>
<creator>Sèze, Geneviève</creator>
<creator>Martiny, Nadège</creator>
<creator>Camberlin, Pierre</creator>
<creator>Cornu, Guillaume</creator>
<creator>Morel, B.</creator>
<creator>Moron, Vincent</creator>
<creator>Bigot, S.</creator>
<creator>Brou, T.</creator>
<creator>Dubreuil, V.</creator>
<contributor>Biogéosciences ; Université de Bourgogne (UB) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Biens et services des écosystèmes forestiers tropicaux (UPR BSEF) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD)</contributor>
<contributor>Laboratoire de Météorologie Dynamique (LMD) ; Université Pierre et Marie Curie - Paris 6 (UPMC) - École normale supérieure - Paris (ENS Paris) - Polytechnique - X - INSU - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Laboratoire d'Energétique, d'Electronique et Procédés (LE2P) ; Université de la Réunion</contributor>
<contributor>Centre européen de recherche et d'enseignement de géosciences de l'environnement (CEREGE) ; Centre National de la Recherche Scientifique (CNRS) - INSU - Collège de France - Aix Marseille Université (AMU)</contributor>
<contributor>International Research Institute for Climate and Society (IRI) ; The Earth Institute of Columbia University</contributor>
<contributor>Laboratoire d'étude des transferts en hydrologie et environnement (LTHE) ; Observatoire des Sciences de l'Univers de Grenoble (OSUG) ; Université Joseph Fourier - Grenoble 1 (UJF) - INSU - Centre National de la Recherche Scientifique (CNRS) - Université Joseph Fourier - Grenoble 1 (UJF) - INSU - Centre National de la Recherche Scientifique (CNRS) - Institut National Polytechnique de Grenoble (INPG) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Espace pour le Développement (UMR ESPACE-DEV) ; Institut de Recherche pour le Développement (IRD) - Université des Antilles et de la Guyane (UAG) - Université de la Réunion - Université de Montpellier (UM)</contributor>
<contributor>Littoral, Environnement, Télédétection, Géomatique (LETG - Costel) ; Université de Nantes (UN) - Université de Caen Basse-Normandie - Université de Bretagne Occidentale (UBO) - Université Rennes 2 - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Financial support from the Centre National d’Etudes Spatiales (CNES, VEGREENE project).</contributor>
<description>14 pages</description>
<description>International audience</description>
<source>ISSN: 0168-1923</source>
<source>Agricultural and Forest Meteorology</source>
<publisher>Elsevier Masson</publisher>
<identifier>hal-01309565</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01309565</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01309565</source>
<source>Agricultural and Forest Meteorology, Elsevier Masson, 2016, 223, pp.81-94. <http://www.sciencedirect.com/science/article/pii/S0168192316302362>. <10.1016/j.agrformet.2016.04.005></source>
<identifier>DOI : 10.1016/j.agrformet.2016.04.005</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.agrformet.2016.04.005</relation>
<source>http://www.sciencedirect.com/science/article/pii/S0168192316302362</source>
<language>en</language>
<subject lang=en>Central Africa</subject>
<subject lang=en>Tropical forests</subject>
<subject lang=en>Enhanced Vegetative Index</subject>
<subject lang=en>Diurnal cycles</subject>
<subject lang=en>Solar radiation</subject>
<subject lang=en>Cloud cover</subject>
<subject lang=en>Rainfall</subject>
<subject>[SDU.STU.CL] Sciences of the Universe [physics]/Earth Sciences/Climatology</subject>
<subject>[SDV.SA.SF] Life Sciences [q-bio]/Agricultural sciences/Silviculture, forestry</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Central Africa hosts the world's second largest tropical forest after the Amazonian basin. However, as compared to its Amazonian counterpart, the Central Africa forests receive much less rain (∼1500 mm/year in mean spread over two rainy seasons in March-May and September-November, and two dry seasons). They also experience a slower deforestation rate, so that the main threat for the next decades might come from climate variations. Nonetheless, their response to the annual cycle of solar radiation and rainfall/clouds is still poorly known. Analysing high resolution remote sensing data of Enhanced Vegetation Index, rainfall, cloudiness, and solar radiation for a target region located between 0 and 5°N and 12–19°E, we explore the climatic drivers of the forests greenness mean annual cycle. Three main points emerge; first, the diurnal cycle is a key-scale for understanding the mean annual cycles of rainfall and incoming solar radiation at surface, then how climate shapes the greenness mean annual evolution; second, neither the two dry seasons nor the two rainy seasons resemble each other in terms of cloud cover, solar radiation and rainfall, and their links with greenness levels; third, whereas the first rainy season (March-May) appears optimal for greenness especially because of favorable light conditions, water availability is the main controlling factor during the main dry season and at the start of the first vegetative season (February). Regarding the little dry season (mid-June-mid-August) and the second rainy season (September-October), light availability might be the main limiting factor. These findings pave the way for further studies of the climate interannual variability and change impacts on the Central Africa forests, taking into account time-scale interactions.</description>
<date>2016-06-15</date>
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