A few prospective ideas on climate reconstruction: from a statistical single proxy approach towards a multi-proxy and dynamical approach
2009
Guiot, Joel | Wu, Haibin | Garreta, Vincent | Hatté, Christine | Magny, Michel | Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) ; Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) | Institut des Sciences de l'Environnement ; Université du Québec à Montréal = University of Québec in Montréal (UQAM) | Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE) ; Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) | Géochrononologie Traceurs Archéométrie (GEOTRAC) ; Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE) ; Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) | Laboratoire de chrono-écologie - CNRS (UMR6565) (LCE) ; Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC) ; Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC) | EU 5th PCRD MOTIF ((EVK2-CT-2002-00153); ESF EUROCLIMATE/DECVEG; ANR Blanc 2006 - PICC | DECVEG | ANR-05-BLAN-0312,PICC(2005)
13 pages
Mostrar más [+] Menos [-]Inglés. Important progresses have been made in palaeo- climatological studies by using statistical methods. But they are in somewhere limited as they take the present as an ab- solute reference. This is particularly true for the modern analogue technique. The availability of mechanistic mod- els to simulate the proxies measured in the sediment cores gives now the possibility to relax this constraint. In particu- lar, vegetation models provide outputs comparable to pollen data (assuming that there is a relationship between plant pro- ductivity and pollen counts). The input of such models is, among others, climate. The idea behind paleo-climatological reconstructions is then to obtain inputs, given outputs. This procedure, called model inversion, can be achieved with ap- propriate algorithms in the frame of the Bayesian statistical theory. But we have chosen to present it in an intuitive way, avoiding the mathematics behind it. Starting from a rela- tive simple application, based on an equilibrium BIOME3 model with a single proxy (pollen), the approach has evolved into two directions: (1) by using several proxies measured on the same core (e.g. lake-level status and δ13C) when they are related to a component of the vegetation, and (2) by us- ing a more complex vegetation model, the dynamic vegeta- tion model LPJ-GUESS. Examples presented (most of them being already published) concern Last Glacial Maximum in Europe and Africa, Holocene in a site of the Swiss Jura, an Eemian site in France. The main results are that: (1) pollen alone is not able to provide exhaustive information on precip- itation, (2) assuming past CO2 equivalent to modern one may induce biases in climate reconstruction, (3) vegetation mod- els seem to be too much constrained by temperature relative to precipitation in temperate regions. This paper attempts to organise some recent ideas in the palaeoclimatological re- construction domain and to propose prospectives in that ef- fervescent domain.
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