Publication Abstracts

Schubert et al. 2009

Schubert, S., D. Gutzler, H. Wang, A. Dai, T. Delworth, C. Deser, K. Findell, R. Fu, W. Higgins, M. Hoerling, B. Kirtman, R. Koster, A. Kumar, D. Legler, D. Lettenmaier, B. Lyon, V. Magana, K. Mo, S. Nigam, P. Pegion, A. Phillips, R. Pulwarty, D. Rind, A. Ruiz-Barradas, J. Schemm, R. Seager, R. Stewart, M. Suarez, J. Syktus, M. Ting, C. Wang, S. Weaver, and N. Zeng, 2009: A USCLIVAR project to assess and compare the responses of global climate models to drought-related SST forcing patterns: Overview and results. J. Climate, 22, 5251-5272, doi:10.1175/2009JCLI3060.1.

The USCLIVAR working group on drought recently initiated a series of global climate model simulations forced with idealized SST anomaly patterns, designed to address a number of uncertainties regarding the impact of SST forcing and the role of land-atmosphere feedbacks on regional drought. The runs were carried out with five different atmospheric general circulation models (AGCMs), and one coupled atmosphere-ocean model in which the model was continuously nudged to the imposed SST forcing. This paper provides an overview of the experiments and some initial results focusing on the responses to the leading patterns of annual mean SST variability consisting of a Pacific El Niño/Southern Oscillation (ENSO)-like pattern, a pattern that resembles the Atlantic Multi-decadal Oscillation (AMO), and a global trend pattern.

One of the key findings is that all the AGCMs produce broadly similar (though different in detail) precipitation responses to the Pacific forcing pattern, with a cold Pacific leading to reduced precipitation and a warm Pacific leading to enhanced precipitation over most of the United States. While the response to the Atlantic pattern is less robust, there is general agreement among the models that the largest precipitation response over the U.S. tends to occur when the two oceans have anomalies of opposite sign. Further highlights of the response over the U.S. to the Pacific forcing include precipitation signal-to-noise ratios that peak in spring, and surface temperature signal-to-noise ratios that are both lower and show less agreement among the models than those found for the precipitation response. The response to the positive SST trend forcing pattern is an overall surface warming over the world's land areas with substantial regional variations that are in part reproduced in runs forced with a globally uniform SST trend forcing. The precipitation response to the trend forcing is weak in all the models.

It is hoped that these early results, as well as those reported in the other contributions to this special issue on drought will serve to stimulate further analysis of these simulations, as well as suggest new research on the physical mechanisms contributing to hydroclimatic variability and change throughout the world.

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BibTeX Citation

@article{sc01400w,
  author={Schubert, S. and Gutzler, D. and Wang, H. and Dai, A. and Delworth, T. and Deser, C. and Findell, K. and Fu, R. and Higgins, W. and Hoerling, M. and Kirtman, B. and Koster, R. and Kumar, A. and Legler, D. and Lettenmaier, D. and Lyon, B. and Magana, V. and Mo, K. and Nigam, S. and Pegion, P. and Phillips, A. and Pulwarty, R. and Rind, D. and Ruiz-Barradas, A. and Schemm, J. and Seager, R. and Stewart, R. and Suarez, M. and Syktus, J. and Ting, M. and Wang, C. and Weaver, S. and Zeng, N.},
  title={A USCLIVAR project to assess and compare the responses of global climate models to drought-related SST forcing patterns: Overview and results},
  year={2009},
  journal={J. Climate},
  volume={22},
  pages={5251--5272},
  doi={10.1175/2009JCLI3060.1},
}

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RIS Citation

TY  - JOUR
ID  - sc01400w
AU  - Schubert, S.
AU  - Gutzler, D.
AU  - Wang, H.
AU  - Dai, A.
AU  - Delworth, T.
AU  - Deser, C.
AU  - Findell, K.
AU  - Fu, R.
AU  - Higgins, W.
AU  - Hoerling, M.
AU  - Kirtman, B.
AU  - Koster, R.
AU  - Kumar, A.
AU  - Legler, D.
AU  - Lettenmaier, D.
AU  - Lyon, B.
AU  - Magana, V.
AU  - Mo, K.
AU  - Nigam, S.
AU  - Pegion, P.
AU  - Phillips, A.
AU  - Pulwarty, R.
AU  - Rind, D.
AU  - Ruiz-Barradas, A.
AU  - Schemm, J.
AU  - Seager, R.
AU  - Stewart, R.
AU  - Suarez, M.
AU  - Syktus, J.
AU  - Ting, M.
AU  - Wang, C.
AU  - Weaver, S.
AU  - Zeng, N.
PY  - 2009
TI  - A USCLIVAR project to assess and compare the responses of global climate models to drought-related SST forcing patterns: Overview and results
JA  - J. Climate
VL  - 22
SP  - 5251
EP  - 5272
DO  - 10.1175/2009JCLI3060.1
ER  -

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