Abstract
Uncertainties in the climate response to a doubling of atmospheric CO2 concentrations are quantified in a perturbed land surface parameter experiment. The ensemble of 108 members is constructed by systematically perturbing five poorly constrained land surface parameters of global climate model individually and in all possible combinations. The land surface parameters induce small uncertainties at global scale, substantial uncertainties at regional and seasonal scale and very large uncertainties in the tails of the distribution, the climate extremes. Climate sensitivity varies across the ensemble mainly due to the perturbation of the snow albedo parameterization, which controls the snow albedo feedback strength. The uncertainty range in the global response is small relative to perturbed physics experiments focusing on atmospheric parameters. However, land surface parameters are revealed to control the response not only of the mean but also of the variability of temperature. Major uncertainties are identified in the response of climate extremes to a doubling of CO2. During winter the response both of temperature mean and daily variability relates to fractional snow cover. Cold extremes over high latitudes warm disproportionately in ensemble members with strong snow albedo feedback and large snow cover reduction. Reduced snow cover leads to more winter warming and stronger variability decrease. As a result uncertainties in mean and variability response line up, with some members showing weak and others very strong warming of the cold tail of the distribution, depending on the snow albedo parametrization. The uncertainty across the ensemble regionally exceeds the CMIP3 multi-model range. Regarding summer hot extremes, the uncertainties are larger than for mean summer warming but smaller than in multi-model experiments. The summer precipitation response to a doubling of CO2 is not robust over many regions. Land surface parameter perturbations and natural variability alter the sign of the response even over subtropical regions.
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Acknowledgments
We thank Gerald Meehl, Keith Oleson and Reto Knutti for the fruitful discussion and the anonymous reviewers for their valuable comments on the manuscript. Erich Fischer was supported by the Swiss National Science Foundation. Support of this dataset is provided by the Office of Science, U.S. Department of Energy.
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Fischer, E.M., Lawrence, D.M. & Sanderson, B.M. Quantifying uncertainties in projections of extremes—a perturbed land surface parameter experiment. Clim Dyn 37, 1381–1398 (2011). https://doi.org/10.1007/s00382-010-0915-y
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DOI: https://doi.org/10.1007/s00382-010-0915-y