World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

North African Vegetation-precipitation Feedback in Early and Mid-holocene Climate Simulations with Ccsm3-dgvm : Volume 10, Issue 3 (12/05/2014)

By Rachmayani, R.

Click here to view

Book Id: WPLBN0004006683
Format Type: PDF Article :
File Size: Pages 32
Reproduction Date: 2015

Title: North African Vegetation-precipitation Feedback in Early and Mid-holocene Climate Simulations with Ccsm3-dgvm : Volume 10, Issue 3 (12/05/2014)  
Author: Rachmayani, R.
Volume: Vol. 10, Issue 3
Language: English
Subject: Science, Climate, Past
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Rachmayani, R., Schulz, M., & Prange, M. (2014). North African Vegetation-precipitation Feedback in Early and Mid-holocene Climate Simulations with Ccsm3-dgvm : Volume 10, Issue 3 (12/05/2014). Retrieved from http://www.ebooklibrary.org/


Description
Description: Faculty of Geosciences, University of Bremen, Klagenfurter Strasse, 28334 Bremen, Germany. The present study analyses the sign, strength and working mechanism of the vegetation-precipitation feedback over North Africa in middle (6 ka BP) and early Holocene (9 ka BP) simulations using the comprehensive coupled climate-vegetation model CCSM3-DGVM. The coupled model simulates enhanced summer rainfall and a northward migration of the West African monsoon trough along with an expansion of the vegetation cover for the early and middle Holocene compared to pre-industrial. It is shown that dynamic vegetation enhances the orbitally triggered summer precipitation anomaly by approximately 20% in the Sahara/Sahel region (10° N–25° N, 20° W–30° E) in both the early and mid-Holocene experiments compared to their fixed-vegetation counterparts. The primary vegetation-rainfall feedback identified here operates through surface latent heat flux anomalies by canopy evaporation and transpiration and their effect on the mid-tropospheric African Easterly Jet, whereas the effects of vegetation changes on surface albedo and local water recycling play a negligible role. Even though CCSM3-DGVM simulates a positive vegetation-precipitation feedback in the North African region, this feedback is not strong enough to produce multiple equilibrium climate-ecosystem states on a regional scale.

Summary
North African vegetation-precipitation feedback in early and mid-Holocene climate simulations with CCSM3-DGVM

Excerpt
Bartlein, P. J., Harrison, S. P., Brewer, S., Connor, S., Davis, B. A. S., Gajewski, K., Guiot, J., Harrison-Prentice, T. I., Henderson, A., Peyron, O., Prentice, I. C., Scholze, M., Seppa, H., Shuman, B., Sugita, S., Thompson, R. S., Viau, A. E., Williams, J., Wu, H.: Pollen-based continental climate reconstructions at 6 and 21 ka: A global synthesis, Clim. Dynam, 37, 775–802, 2011.; Bathiany, S., Claussen, M., and Fraedrich, K.: Implications of climate variability for the detection of multiple equilibria and for rapid transitions in the atmosphere-vegetation system, Clim. Dynam., 38, 1775–1790, 2012.; Berger, A.: Long-term variations of daily insolation and Quaternary Climatic Changes, J. Atmos. Sci., 35, 2362–2367, 1978.; Beyerle, U., Rueedi, J., Leuenberger, M., Aeschbach-Hertig, W., Peeters, F., Kipfer, R., and Dodo, A.: Evidence for periods of wetter and cooler climate in the Sahel between 6 and 40 kyr BP derived from groundwater, Geophys. Res. Lett., 30, 1173, doi:10.1029/2002GL016310, 2003.; Bonan, G. B. and Levis, S.: Evaluating aspects of the Community Land and Atmosphere Models (CLM3 and CAM) using a dynamic global vegetation model, J. Climate, 19, 2290–2301, 2006.; Bonan, G. B., Levis, S., Sitch, S., Vertenstein, M., and Oleson, K. W.: A dynamic global vegetation model for use with climate models: concepts and description of simulated vegetation dynamics, Global Change Biol., 9, 1543–1566, 2003.; Bosmans, J. H. C., Drijfhout, S. S., Tuenter, E., Lourens, L. J., Hilgen, F. J., and Weber, S. L.: Monsoonal response to mid-holocene orbital forcing in a high resolution GCM, Clim. Past, 8, 723–740, doi:10.5194/cp-8-723-2012, 2012.; Bouimetarhan, I., Prange, M., Schefuss, E., Dupont, L., Lippold, J., Mulitza, S., and Zonneveld, K.: Sahel megadrought during Heinrich Stadial 1: evidence for a three-phase evolution of the low- and mid-level West African wind system, Quaternary Sci. Rev., 58, 66–76, 2012.; Braconnot, P., Otto-Bliesner, B., Harrison, S., Joussaume, S., Peterchmitt, J.-Y., Abe-Ouchi, A., Crucifix, M., Driesschaert, E., Fichefet, Th., Hewitt, C. D., Kageyama, M., Kitoh, A., La\^iné, A., Loutre, M.-F., Marti, O., Merkel, U., Ramstein, G., Valdes, P., Weber, S. L., Yu, Y., and Zhao, Y.: Results of PMIP2 coupled simulations of the Mid-Holocene and Last Glacial Maximum – Part 1: experiments and large-scale features, Clim. Past, 3, 261–277, doi:10.5194/cp-3-261-2007, 2007.; Brovkin, V. and Claussen, M.: Comment on Climate-Driven Ecosystem Succession in the Sahara: The Past 6000 Years, Science, 322, 1326, doi:10.1126/science.1163381, 2008.; Brubaker, K. L., Entekhabi, D., and Eagleson, P. S.: Estimation of continental precipitation recycling, J. Climate, 6, 1077–1089, 1993.; Brovkin, V., Claussen, M., Petoukhov, V., and Ganopolski, A.: On the stability of the atmosphere-vegetation system in the Sahel/Sahara region, J. Geophys. Res., 103, 31613–31624, 1998.; Charney, J. G.: Dynamics of deserts and drought in the Sahel, Q. J. Roy. Meteorol. Soc., 101, 193–202, 1975.; Charney, J. G., Stone, P. H., and Quirk, W. J.: Reply, Science, 191, 100–102, 1976.; Claussen, M.: On coupling global biome models with climate models, Climate Res., 4, 203–221, 1994.; Claussen, M.: Modelling biogeophysical feedback in the African and Indian Monsoon region, Clim. Dynam., 13, 247–257, 1997.; Claussen, M.: On multiple solutions of the atmosphere-vegetation system in present-day climate, Global Change Biol., 5, 549–559, 1998.; Claussen, M.: Late Quaternary vegetation-climate feedbacks, Clim. Past, 5, 203–216, doi:10.5194/cp-5-203-2009, 2009.; Claussen, M. and Gayler, V.: The greening of Sahara during the mid-Holocene: Results o

 

Click To View

Additional Books


  • Correlation of Greenland Ice-core Isotop... (by )
  • A Guide for Digitising Manuscript Climat... (by )
  • Stability of the Vegetation–atmosphere S... (by )
  • Potential Analysis Reveals Changing Numb... (by )
  • A Regional Ocean Circulation Model for t... (by )
  • Dansgaard–oeschger Events: Bifurcation P... (by )
  • Sediment Sequence and Site Formation Pro... (by )
  • Obliquity Forcing of Low-latitude Climat... (by )
  • The Edc3 Chronology for the Epica Dome C... (by )
  • Variations in Intermediate and Deep Ocea... (by )
  • Tephrostratigraphic Studies on a Sedimen... (by )
  • Northern Hemisphere Control of Deglacial... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.