The impact of increase in CO2 on the simulation of tropical biennial oscillations (TBO) in 12 coupled general circulation models

Nanjundiah, Ravi S. ; Vidyunmala, V. ; Srinivasan, J. (2005) The impact of increase in CO2 on the simulation of tropical biennial oscillations (TBO) in 12 coupled general circulation models Atmospheric Science Letters, 6 (3). pp. 183-191. ISSN 1530-261X

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Official URL: http://doi.org/10.1002/asl.115

Related URL: http://dx.doi.org/10.1002/asl.115

Abstract

The Tropical Biennial Oscillation (TBO) in coupled GCM simulations over the Indo–Pacific region in IPCC-AR4 scenarios of 280 (PI) and 720 (FS) ppm of CO2 (both stable) are investigated. In many models, TBO is more prominent in FS in Nino3.4 SST and rainfall but less prominent in Indian Ocean SST. TBO, as primary mode (mode with highest power), is simulated by more models in Indian and Australian rainfall during FS. Thus, the Indo–Pacific teleconnection through Walker circulation rather than local forcing over the Indian Ocean could be responsible for increased TBO in Indian and Australian rainfall. Copyright © 2005 Royal Meteorological Society

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