Abrupt Climate Change Simulations
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Wan, X., Chang, P., Jackson, C.S., Ji, L. and Li, M. 2011. Plausible effect of climate model bias on abrupt climate change simulations in Atlantic sector. Deep-Sea Research II 58: 1904-1913.
Writing as background for their study, authors Wan et al. (2011) state that “the notorious tropical bias problem in climate simulations of global coupled general circulation models (e.g., Mechoso et al., 1995; Latif et al., 2001; Davey et al., 2002; Meehl et al., 2005) manifests itself particularly strongly in the tropical Atlantic,” and they say that “while progress towards reducing tropical climate biases has been made in the tropical Pacific over the past decades (e.g., Deser et al., 2006), little or no progress has been made in the tropical Atlantic (Breugem et al., 2006; Richter and Xie, 2008; Wahl dapoxetine 60 mg online buy , dapoxetine online pharmacy england, dapoxetine no prescription uk, buy dapoxetine with american express, dapoxetine pill et al., 2009).” In fact, they state that “the climate bias problem is still so severe that one of the most basic features of the equatorial Atlantic Ocean — the eastward shoaling thermocline — cannot be reproduced by most of the Intergovernmental Panel on Climate Change (IPCC) assessment report (AR4) models,” citing Richter and Xie (2008).
In their own investigation of the subject, Wan et al., as they describe it, “show that the bias in the eastern equatorial Atlantic has a major effect on sea-surface temperature (SST) response to a rapid change in the Atlantic Meridional Overturning Circulation (AMOC).” This they do by (1) exemplifying the problem “through an inter-model comparison study of tropical Atlantic response to an abrupt change in [the] AMOC using the Geophysical Fluid Dynamics Laboratory (GFDL) Coupled Climate Model (CM2.1) and the National Center for Atmospheric Research (NCAR) Community Climate System Model (CCSM3),” and by (2) dissecting the oceanic mechanisms responsible for the difference in the models’ SST responses.
The four researchers say their results demonstrate that the different SST responses of the two models “is plausibly attributed to systematic differences in the simulated tropical Atlantic ocean circulation.” The ultimate implication of Wan et al.’s findings is, in their words, that “in order to accurately simulate past abrupt climate changes and project future changes, the bias in climate models must be reduced.” But if “little or no progress” on this problem has been made in the tropical Atlantic “over the past decades,” as noted by the four of them, the outlook is not very promising for such a positive development any time soon.
Breugem, W.P., Hazeleger, W. and Haarsma, R.J. 2006. Multimodel study of tropical Atlantic variability and change. Geophysical Research Letters 33: 10.1029/2006GL027831.
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Wahl, S., Latif, M., Park, W. and Keenlyside, N. 2009. On the tropical Atlantic SST warm bias in the Kiel Climate Model. Climate Dynamics cheapest prices pharmacy. zoloft price at walgreens . fastest shipping, prozac generic zoloft . 33: 10.1007/s00382-009-0690-9.