Abstract
Modelling simulations of palaeoclimate and past vegetation form and function can contribute to global change research by constraining predictions of potential earth system responses to future warming, and by providing useful insights into the ecophysiological tolerances and threshold responses of plants to varying degrees of atmospheric change. We contrasted HadCM3LC simulations of Amazonian forest at the last glacial maximum (LGM; 21 kyr ago) and a Younger Dryas–like period (13–12 kyr ago) with predicted responses of future warming to provide estimates of the climatic limits under which the Amazon forest remains relatively stable. Our simulations indicate that despite lower atmospheric CO2concentrations and increased aridity during the LGM, Amazonia remains mostly forested, and that the cooling climate of the Younger Dryas–like period in fact causes a trend towardincreasedabove–ground carbon balance relative to today. The vegetation feedbacks responsible for maintaining forest integrity in past climates (i.e. decreased evapotranspiration and reduced plant respiration) cannot be maintained into the future. Although elevated atmospheric CO2contributes to a positive enhancement of plant carbon and water balance, decreased stomatal conductance and increased plant and soil respiration cause a positive feedback that amplifies localized drying and climate warming. We speculate that the Amazonian forest is currently near its critical resiliency threshold, and that even minor climate warming may be sufficient to promote deleterious feedbacks on forest integrity.
Bibliography
Cowling, S. A., Betts, R. A., Cox, P. M., Ettwein, V. J., Jones, C. D., Maslin, M. A., & Spall, S. A. (2004). Contrasting simulated past and future responses of the Amazonian forest to atmospheric change. Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences, 359(1443), 539â547.
References
90
Referenced
67
10.1111/j.1365-3040.1991.tb01367.x
10.1038/35055524
10.1126/science.291.5504.640
10.1038/345405a0
10.1038/385707a0
10.1016/S0031-0182(01)00349-2
10.1006/qres.1997.1932
10.1006/qres.2001.2264
10.1016/S0031-0182(01)00435-7
10.1038/42924
10.1046/j.1365-2699.2000.00160.x
-
Betts R. A. Cox P. M. Harris P. P. Huntingford C. & Jones C. D. 2004 The role of ecosystem-atmosphere interactions in simulated Amazon forest dieback under global climate warming (In preparation.)
(
10.1007/s00704-004-0050-y
) 10.1029/PA003i001p00001
10.1007/BF00392238
-
Bunyard P. 2002 Climate and the Amazon: consequences for our planet. Ecologist October 1-11.
(
10.22579/20112629.167
) 10.1023/A:1016059415848
10.1126/science.191.4232.1131
- CLIMAP Project Members 1981 Seasonal reconstruction of the Earth's surface at the last glacial maximum. In Geological Society of America chart and map series 36.
10.1126/science.274.5284.85
10.1016/S0277-3791(99)00059-1
{'key': 'p_21', 'first-page': '609', 'article-title': 'A paradigm to be discarded: geological and paleoecological data falsify the Haffer & Prance refuge hypothesis of Amazonian speciation', 'volume': '16', 'author': 'Colinvaux P. A.', 'year': '2001', 'journal-title': 'Amazoniana'}
/ Amazoniana / A paradigm to be discarded: geological and paleoecological data falsify the Haffer & Prance refuge hypothesis of Amazonian speciation by Colinvaux P. A. (2001)10.1175/1520-0442(2000)013<0018:CEODAD>2.0.CO;2
10.1029/2002GB001915
10.1006/qres.2000.2197
- Cox P. M. 2001 Description of the TRIFFID dynamic global vegetation model. Technical note 24 Hadley Centre UK Meteorological Office.
10.1016/S0022-1694(98)00203-0
10.1007/s003820050276
10.1038/35041539
10.1006/qres.2000.2192
10.1007/s003820000074
10.1046/j.1365-2486.1999.00253.x
10.1029/1999JD901086
10.1016/S0168-1923(02)00102-8
10.1007/s003820050317
10.1023/A:1005569915357
10.1029/2000GL012015
10.1007/s003820050010
10.1126/science.263.5147.663
10.1006/qres.1998.2020
10.1126/science.165.3889.131
{'key': 'p_41', 'first-page': '609', 'article-title': 'Climatic forcing of evolution in Amazonia during the Cenozoic: on the refuge theory of biotic differentiation', 'volume': '16', 'author': 'Haffer J.', 'year': '2001', 'journal-title': 'Amazoniana'}
/ Amazoniana / Climatic forcing of evolution in Amazonia during the Cenozoic: on the refuge theory of biotic differentiation by Haffer J. (2001)10.1046/j.1365-2486.2003.00640.x
10.1126/science.1059725
10.1007/s00382-002-0272-6
10.1126/science.290.5498.1951
10.1007/s003820050155
10.1175/1520-0442(2001)014<4113:TCCRTE>2.0.CO;2
- Jones C. D. Spall S. A. & Cox P. M. 2004 Simulation of the climate-carbon cycle system at the Last Glacial Maximum. (In preparation.)
10.1029/2000GB001375
10.1038/375666a0
10.1098/rstb.2003.1429
{'key': 'p_52', 'first-page': '1408', 'article-title': 'Interannual growth rate variations of atmospheric CO2 and its d13C, H2, CH4 and CO between 1992 and 1999 linked to biomass burning', 'volume': '16', 'author': 'Langenfelds R. L.', 'year': '2003', 'journal-title': 'Global Biogeochem. Cycles'}
/ Global Biogeochem. Cycles / Interannual growth rate variations of atmospheric CO2 and its d13C, H2, CH4 and CO between 1992 and 1999 linked to biomass burning by Langenfelds R. L. (2003)10.1126/science.291.5503.438
10.1006/qres.1993.1011
10.1006/qres.2000.2187
10.1029/1999JD900837
10.1175/1520-0442(2000)013<1313:LSVFOA>2.0.CO;2
10.1098/rsta.2002.1098
10.1016/S0169-5347(00)01906-6
10.1126/science.290.5500.2285
/ Science / Reconstruction of the Amazon basin effective moisture availability over the past 14 000 years by Maslin M. A. (2000)10.1126/science.290.5500.2291
10.1098/rstb.2003.1434
10.1029/1999PA900012
10.1130/0091-7613(2001)029<0519:IEFCAD>2.0.CO;2
10.1175/1520-0442(1991)004<0957:ADARCC>2.0.CO;2
10.1016/S0967-0637(00)00080-7
10.1098/rsta.2002.1027
10.1029/1999GL900183
10.1029/2000JD900563
10.1038/25224
{'key': 'p_71', 'first-page': '659', 'article-title': 'The climate and biomes of Europe at 6000 yr BP: comparison of model simulations and pollen-based reconstructions', 'volume': '17', 'author': 'Prentice I. C.', 'year': '1998', 'journal-title': 'Quatern. Sci. Rev.'}
/ Quatern. Sci. Rev. / The climate and biomes of Europe at 6000 yr BP: comparison of model simulations and pollen-based reconstructions by Prentice I. C. (1998)10.1046/j.1365-2699.2000.00425.x
- Richards P. W. 1996 The tropical rain forest 2nd edn. Cambridge University Press.
10.1126/science.271.5254.1402
10.1016/S0031-0182(00)00256-X
10.1016/S0031-0182(02)00591-6
10.1016/S0168-1923(02)00044-8
10.1126/science.269.5222.379
10.1006/qres.1998.2017
10.1126/science.269.5220.46
10.1126/science.282.5395.1858
10.1175/1520-0442(2001)014<3102:MDTATC>2.0.CO;2
10.1038/25328
10.1002/jqs.730
10.1023/A:1016168827653
10.1175/1520-0442(2002)015<0764:PGTROA>2.0.CO;2
10.1046/j.1523-1739.2000.99298.x
10.1002/joc.3370050202
10.1130/0091-7613(1998)026<0675:OIVCKT>2.3.CO;2
10.1023/A:1010662425950
Dates
Type | When |
---|---|
Created | 21 years, 5 months ago (April 5, 2004, 6:19 p.m.) |
Deposited | 8 months, 3 weeks ago (Dec. 15, 2024, 2:29 p.m.) |
Indexed | 1 month ago (July 30, 2025, 9:56 a.m.) |
Issued | 21 years, 5 months ago (March 29, 2004) |
Published | 21 years, 5 months ago (March 29, 2004) |
Published Online | 21 years, 5 months ago (March 29, 2004) |
Published Print | 21 years, 5 months ago (March 29, 2004) |
@article{Cowling_2004, title={Contrasting simulated past and future responses of the Amazonian forest to atmospheric change}, volume={359}, ISSN={1471-2970}, url={http://dx.doi.org/10.1098/rstb.2003.1427}, DOI={10.1098/rstb.2003.1427}, number={1443}, journal={Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences}, publisher={The Royal Society}, author={Cowling, Sharon A. and Betts, Richard A. and Cox, Peter M. and Ettwein, Virginia J. and Jones, Chris D. and Maslin, Mark A. and Spall, Steven A.}, editor={Malhi, Y. and Phillips, O. L.}, year={2004}, month=mar, pages={539–547} }