Holocene land-cover reconstructions for studies on land cover-climate feedbacksReport as inadecuate




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1 School of Pure and Applied Natural Sciences 2 Institute of Ecology Institute of Ecology 3 GEODE - Géographie de l-environnement 4 School of Pure and Applied Natural Sciences School of Pure and Applied Natural Sciences 5 Geobiosphere Science Centre, Lund University Geobiosphere Science Centre 6 Department of Earth and Ecosystem sciences Department of Physical Geography and Ecosystems Analysis 7 ARVE Group EPFL - Ecole Polytechnique Fédérale de Lausanne 8 Swedish Meteorological and hydrological Institute Sveriges Meteorologiska och Hydrologiska Institut 9 Department of Earth and Ecosystem sciences Geobiosphere Science Centre 10 Institute of Earth Science Institute of Earth Sciences 11 Institute for Coastel Research GKSS - Institute for Coastel research 12 School of Geography School of Geography 13 Department of Palynology and Climate Dynamics Department of Palynology and Climate Dynamics 14 Institute of Cultural Research Institute of Cultural Research 15 Department of Geology and Mineralogy Department of Geology and Mineralogy 16 Department of Biology Department of Biology 17 Bjerknes Centre for Climate Research Bjerknes Centre for Climate Research 18 Viscum pollenanalys and miljohistoria Viscum pollenanalys and miljohistoria 19 Bergen Museum Bergen Museum 20 Faculty of Geography and Earth sciences faculty of Geography and earth sciences 21 Institute of Plant Sciences Institute of Plant Sciences 22 Swedish National Heritage Board Swedish National Heritage Board 23 Laboratory of Palaeoecology and Archaeology Laboratory of Palaeoecology and Archaeology 24 CEREGE - Centre européen de recherche et d-enseignement de géosciences de l-environnement 25 Landesamt fur Denkmalpfege Landesamt fur Denkmalpfege 26 SLU - Swedish University of Agricultural Sciences 27 Department of Forest ecology and Management Institutionen for sydsvensk skogsvetenskap southern swedish forest research centre 28 Department of Forest ecology and Management Department of Forest ecology and Management 29 Department of Geology

Abstract : The major objectives of this paper are: 1 to review the pros and cons of the scenarios of past anthropogenic land cover change ALCC developed during the last ten years, 2 to discuss issues related to pollen-based reconstruction of the past land-cover and introduce a new method, REVEALS Regional Estimates of VEgetation Abundance from Large Sites, to infer long-term records of past landcover from pollen data, 3 to present a new project LANDCLIM:LAND cover - CLIMate interactions in NW Europe during the Holocene currently underway, and show preliminary results of REVEALS reconstructions of the regional land-cover in the Czech Republic for five selected time windows of the Holocene, and 4 to discuss the implications and future directions in climate and vegetation-land-cover modeling, and in the assessment of the effects of human-induced changes in land-cover on the regional climate through altered feedbacks. The existing ALCC scenarios show large discrepancies between them, and few cover time periods older than AD 800. When these scenarios are used to assess the impact of human land-use on climate, contrasting results are obtained. It emphasizes the need for methods such as the REVEALS model-based land-cover reconstructions. They might help to fine-tune descriptions of past landcover and lead to a better understanding of how long-term changes in ALCC might have influenced climate. The REVEALS model is demonstrated to provide better estimates of the regional vegetation-land-cover changes than the traditional use of pollen percentages. This will achieve a robust assessment of land cover at regional- to continental-spatial scale throughout the Holocene. We present maps of REVEALS estimates for the percentage cover of 10 plant functional types PFTs at 200 BP and 6000 BP, and of the two open-land PFTs -grassland- and -agricultural land- at five time-windows from 6000 BP to recent time. The LANDCLIM results are expected to provide crucial data to reassess ALCC estimates for a better understanding of the land suface-atmosphere interactions

Keywords : Land cover change Holocene REVEALS new project LANDCLIM





Author: M.J. Gaillard - S. Sugita - Florence Mazier - A.-K. Trondman - Anna Brostrom - T. Hickler - J.O. Kaplan - E. Kjellström - U. Kok

Source: https://hal.archives-ouvertes.fr/



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