Patterns of Precipitation Change and Climatological Uncertainty among CMIP5 Models, with a Focus on the Midlatitude Pacific Storm Track
Abstract
Projections of modeled precipitation (P) change in global warming scenarios demonstrate marked intermodel disagreement at regional scales. Empirical orthogonal functions (EOFs) and maximum covariance analysis (MCA) are used to diagnose spatial patterns of disagreement in the simulated climatology and end-of-century P changes in phase 5 of the Coupled Model Intercomparison Project (CMIP5) archive. The term principal uncertainty pattern (PUP) is used for any robust mode calculated when applying these techniques to a multimodel ensemble. For selected domains in the tropics, leading PUPs highlight features at the margins of convection zones and in the Pacific cold tongue. The midlatitude Pacific storm track is emphasized given its relevance to wintertime P projections over western North America. The first storm-track PUP identifies a sensitive region of disagreement in P increases over the eastern midlatitude Pacific where the storm track terminates, related to uncertainty in an eastward extension of the climatological jet. The second PUP portrays uncertainty in a zonally asymmetric meridional shift of storm-track P, related to uncertainty in the extent of a poleward jet shift in the western Pacific. Both of these modes appear to arise primarily from intermodel differences in the response to radiative forcing, distinct from sampling of internal variability.more »
- Authors:
-
- Univ. of California, Los Angeles, CA (United States). Dept. of Atmospheric and Oceanic Sciences
- Rutgers Univ., New Brunswick, NJ (United States). Dept. of Environmental Sciences
- Boston Univ., MA (United States). Dept. of Earth and Environment
- Publication Date:
- Research Org.:
- Univ. of California, Los Angeles, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Science Foundation (NSF); National Oceanic and Atmospheric Administration (NOAA), Boulder, CO (United States)
- Contributing Org.:
- World Climate Research Programme (WCRP)
- OSTI Identifier:
- 1470741
- Grant/Contract Number:
- SC0004975; AGS-1102838; AGS-1540518; AGS-1312865; NA11OAR4310099; NA14OAR4310274
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Climate
- Additional Journal Information:
- Journal Volume: 28; Journal Issue: 19; Journal ID: ISSN 0894-8755
- Publisher:
- American Meteorological Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; Circulation/ Dynamics; Atmospheric circulation; Mathematical and statistical techniques; Empirical orthogonal functions; Models and modeling; Climate models; Coupled models; Model errors; Model evaluation/performance
Citation Formats
Langenbrunner, Baird, Neelin, J. David, Lintner, Benjamin R., and Anderson, Bruce T. Patterns of Precipitation Change and Climatological Uncertainty among CMIP5 Models, with a Focus on the Midlatitude Pacific Storm Track. United States: N. p., 2015.
Web. doi:10.1175/JCLI-D-14-00800.1.
Langenbrunner, Baird, Neelin, J. David, Lintner, Benjamin R., & Anderson, Bruce T. Patterns of Precipitation Change and Climatological Uncertainty among CMIP5 Models, with a Focus on the Midlatitude Pacific Storm Track. United States. https://doi.org/10.1175/JCLI-D-14-00800.1
Langenbrunner, Baird, Neelin, J. David, Lintner, Benjamin R., and Anderson, Bruce T. Tue .
"Patterns of Precipitation Change and Climatological Uncertainty among CMIP5 Models, with a Focus on the Midlatitude Pacific Storm Track". United States. https://doi.org/10.1175/JCLI-D-14-00800.1. https://www.osti.gov/servlets/purl/1470741.
@article{osti_1470741,
title = {Patterns of Precipitation Change and Climatological Uncertainty among CMIP5 Models, with a Focus on the Midlatitude Pacific Storm Track},
author = {Langenbrunner, Baird and Neelin, J. David and Lintner, Benjamin R. and Anderson, Bruce T.},
abstractNote = {Projections of modeled precipitation (P) change in global warming scenarios demonstrate marked intermodel disagreement at regional scales. Empirical orthogonal functions (EOFs) and maximum covariance analysis (MCA) are used to diagnose spatial patterns of disagreement in the simulated climatology and end-of-century P changes in phase 5 of the Coupled Model Intercomparison Project (CMIP5) archive. The term principal uncertainty pattern (PUP) is used for any robust mode calculated when applying these techniques to a multimodel ensemble. For selected domains in the tropics, leading PUPs highlight features at the margins of convection zones and in the Pacific cold tongue. The midlatitude Pacific storm track is emphasized given its relevance to wintertime P projections over western North America. The first storm-track PUP identifies a sensitive region of disagreement in P increases over the eastern midlatitude Pacific where the storm track terminates, related to uncertainty in an eastward extension of the climatological jet. The second PUP portrays uncertainty in a zonally asymmetric meridional shift of storm-track P, related to uncertainty in the extent of a poleward jet shift in the western Pacific. Both of these modes appear to arise primarily from intermodel differences in the response to radiative forcing, distinct from sampling of internal variability. The leading storm-track PUPs for P and zonal wind change exhibit similarities to the leading uncertainty patterns for the historical climatology, indicating important and parallel sensitivities in the eastern Pacific storm-track terminus region. However, expansion coefficients for climatological uncertainties tend to be weakly correlated with those for end-of-century change.},
doi = {10.1175/JCLI-D-14-00800.1},
journal = {Journal of Climate},
number = 19,
volume = 28,
place = {United States},
year = {Tue Sep 29 00:00:00 EDT 2015},
month = {Tue Sep 29 00:00:00 EDT 2015}
}
Web of Science
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