Publication: The El Niño-Southern Oscillation (ENSO) Modoki signal in the stratosphere
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2012-02
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American Geophysical Union
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El Niño-Southern Oscillation (ENSO) is known to be the largest source of interannual variability in the tropical troposphere. However, the variability in the tropical Pacific since 1979 seems to be associated not only with "canonical" ENSO events but also with a variation thereof known as ENSO Modoki, which is characterized by warm anomalies in the central Pacific, west from those occurring during a typical ENSO. This works analyzes the signal of ENSO Modoki in the stratosphere and compares it to canonical ENSO by using the chemistry-climate Whole Atmosphere Community Climate Model (WACCM3.5). The results reveal a significant warming in the Southern Hemisphere polar stratosphere during boreal winter months, which propagates downward in early spring; this is absent during canonical warm ENSO events. On the other hand, in the Northern Hemisphere stratosphere, the anomalous warming typical of canonical El Niño episodes during boreal winter is not statistically significant during El Niño Modoki events. These differences are related in WACCM3.5 to changes in tropical convection and tropospheric teleconnections associated with each type of event. In particular, an enhancement and westward displacement of the anomalous convective area during El Niño Modoki episodes is related to an intensification of the Pacific South American teleconnection pattern and a weakening of the Aleutian Low. During cold ENSO Modoki events a significant anomalous cooling is present in the model simulations.
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© Copyright 2012 by the American Geophysical Union. The authors are very thankful to Rolando R. Garcia for multiple fruitful discussions of some parts of the manuscript. D. E. Kinnison is also acknowledged for providing the WACCM3.5 simulations used in this study. I. Zubiaurre was supported by the Spanish Ministry of Education and Sciences under TRODIM project. N. Calvo has been supported by the advanced study program from the National Center for Atmospheric Research (ASP-NCAR).
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Ashok, K., and T. Yamagata (2009), Climate change: The El Niño with a difference, Nature, 461, 481–484, doi:10.1038/461481a.
Ashok, K., S. Behera, A. S. Rao, H. Y. Weng, and T. Yamagata (2007), El Niño Modoki and its teleconnection, J. Geophys. Res., 112, C11007, doi:10.1029/2006JC003798.
Barnston, A. G., and R. E. Livezey (1987), Classification, seasonality and persistence of low-frequency atmospheric circulation patterns, Mon. Weather Rev., 115, 1083–1126, doi:10.1175/1520-0493(1987) 115<1083:CSAPOL>2.0.CO;2.
Bell, C. J., L. J. Gray, A. J. Charlton-Perez, M. M. Joshi, and A. A. Scaife (2009), Stratospheric communication of El Niño teleconnections to European winter, J. Clim., 22, 4083-4096, doi:10.1175/2009JCLI2717.1.
Brönnimann, S., J. Luterbacher, J. Staehelin, T. M. Svendby, G. Hansen, and T. Svenoe (2004), Extreme climate of the global troposphere and stratosphere in 1940–1942 related to El Niño, Nature, 431, 971–974, doi:10.1038/nature02982.
Butchart, N., et al. (2010), Stratospheric dynamics, in Report on the Evaluation of Chemistry-Climate Models, SPARC Rep. 5, edited by V. Eyring, T. G. Shepherd, and D. W. Waugh, pp. 109–148, Stratos. Processes and Their Role in Clim. Chem. Clim. Models Validation Group, Zurich, Switzerland. [Available at http://www.sparc climate.org/publications/sparc-reports/sparc-report-no5/.]
Cagnazzo, C., and E. Manzini (2009), Impact of the stratosphere on the winter tropospheric teleconnections between ENSO and the North Atlantic and European region, J. Clim., 22, 1223–1238, doi:10.1175/2008JCLI2549.1.
Calvo, N., and D. R. Marsh (2011), The combined effects of ENSO and the 11-year solar cycle on the Northern Hemisphere polar stratosphere, J. Geophys. Res., 116, D23112, doi:10.1029/2010JD015226.
Calvo, N., R. R. García, R. García Herrera, D. Gallego, L. Gimeno, E. Hernández, and P. Ribera (2004), Analysis of the ENSO signal in tropospheric and stratospheric temperatures observed by MSU, 1979–2000, J. Clim., 17, 3934–3946, doi:10.1175/1520 0442(2004)017<3934:AOTESI>2.0.CO;2.
Calvo, N., M. A. Giorgetta, R. García Herrera, and E. Manzini (2009), Nonlinearity of the combined warm ENSO and QBO effects on the Northern Hemisphere polar vortex in MAECHAM4 simulations, J. Geophys. Res., 114, D13109, doi:10.1029/2008JD011445.
Calvo, N., R. R. García, W. J. Randel, and D. R. Marsh (2010), Dynamical mechanism for the increase in tropical upwelling in the lowermost tropical stratosphere during warm ENSO events, J. Atmos. Sci., 67, 2331–2340, doi:10.1175/2010JAS3433.1.
Edmon, H. J., Jr., B. J. Hoskins, and M. E. McIntyre (1980), Eliassen-Palm cross sections for the troposphere, J. Atmos. Sci., 37, 2600–2616, doi:10.1175/1520-0469 (1980)037<2600:EPCSFT>2.0.CO;2.
Free, M., and D. J. Seidel (2009), Observed El Niño–Southern Oscillation temperature signal in the stratosphere, J. Geophys. Res., 114, D23108, doi:10.1029/2009JD012420.
García Herrera, R., N. Calvo, R. R. García, and M. A. Giorgetta (2006), Propagation of ENSO temperature signals into the middle atmosphere: A comparison of two general circulation models and ERA-40 reanalysis data, J. Geophys. Res., 111, D06101, doi:10.1029/2005JD006061.
García, R. R., D. R. Marsh, D. E. Kinnison, B. A. Boville, and F. Sassi (2007), Simulations of secular trends in the middle atmosphere, 1950–2003, J. Geophys. Res., 112, D09301, doi:10.1029/2006JD007485.
Garfinkel, C. I., and D. L. Hartmann (2007), Effects of the El-Niño Southern Oscillation and the Quasi-Biennial Oscillation on polar temperatures in the stratosphere, J. Geophys. Res., 112, D19112, doi:10.1029/2007JD008481.
Garfinkel, C. I., and D. L. Hartmann (2008), Different ENSO teleconnections and their effects on the stratospheric polar vortex, J. Geophys. Res., 113, D18114, doi:10.1029/2008JD009920.
Garfinkel, C. I., D. L. Hartmann, and F. Sassi (2010), Tropospheric precursors of anomalous Northern Hemisphere stratospheric polar vortices, J. Clim., 23, 3282–3299, doi:10.1175/2010JCLI3010.1.
Hegyi, B. M., and Y. Deng (2011), A dynamical fingerprint of tropical Pacific Sea surface temperatures on the decadal scale variability of cool-season Arctic precipitation, J. Geophys. Res., 116, D20121, doi:10.1029/2011JD016001.
Horel, J. D., and J. M. Wallace (1981), Planetary-scale atmospheric phenomena associated with the Southern Oscillation, Mon. Weather Rev., 109, 813–829, doi:10.1175/1520-0493(1981)109<0813:PSAPAW>2.0.CO;2.
Hoskins, B. J., and D. J. Karoly (1981), The steady linear response of a spherical atmosphere to thermal and orographic forcing, J. Atmos. Sci., 38, 1179–1196, doi:10.1175/1520-0469(1981)038<1179:TSLROA>2.0.CO;2.
Hurwitz, M. M., I. S. Song, L. D. Oman, P. A. Newman, A. M. Molod, S. M. Frith, and J. E. Nielsen (2011a), Response of the Antarctic stratosphere to warm pool El Niño events in the GEOS CCM, Atmos. Chem. Phys., 11, 9659–9669, doi:10.5194/acp-11-9659-2011.
Hurwitz, M. M., P. A. Newman, L. D. Oman, and A. M. Molod (2011b), Response of the Antarctic stratosphere to two types of El Niño events, J. Clim., 68, 812–822, doi:10.1175/2011JAS3606.1.
Ineson, S., and A. A. Scaife (2009), The role of the stratosphere in the European climate response to El Niño, Nat. Geosci., 2, 32–36, doi:10.1038/ngeo381.
Kao, H. Y., and J. Y. Yu (2009), Contrasting Eastern-Pacific and Central-Pacific types of El Niño, J. Clim., 22, 615–632, doi:10.1175/2008JCLI2309.1.
Karoly, D. J. (1989), Southern Hemisphere circulation features associated with El Niño-Southern Oscillation events, J. Clim., 2, 1239–1252, doi:10.1175/1520-0442(1989)002<1239:SHCFAW>2.0.CO;2.
Kim, H. M., P. J. Webster, and J. A. Curry (2009), Impact of shifting patterns of Pacific Ocean warming on North Atlantic tropical cyclones, Science, 325, 77–80, doi:10.1126/science.1174062.
Kug, J. S., F. F. Jin, and S. I. An (2009), Two types of El Niño events: Cold tongue El Niño and warm pool El Niño, J. Clim., 22, 1499–1515, doi:10.1175/2008JCLI2624.1.
Manzini E., M. A. Giorgetta, M. Esch, L. Kornblueh, and E. Roeckner (2006), The influence of sea surface temperatures on the Northern winter stratosphere: Ensemble simulations with the MAECHAM5 model, J. Clim., 19, 3863–3881, doi:10.1175/JCLI3826.1.
Matthes, K., U. Langematz, L. L. Gray, K. Kodera, and K. Labitzke (2004), Improved 11-year solar signal in the Freie Universität Berlin Climate Middle Atmosphere Model (FUB-CMAM), J. Geophys. Res., 109, D06101, doi:10.1029/2003JD004012.
Mo, K. C., and R. W. Higgins (1998), The Pacific–South American modes and Tropical Convection during the Southern Hemisphere winter, Mon. Weather Rev., 126, 1581–1596, doi:10.1175/15200493(1998)126<1581:TPSAMA>2.0.CO;2.
Randel, W. J., and F. Wu (1996), Isolation of the ozone QBO in SAGE II data by singular-value decomposition, J. Atmos. Sci., 53, 2546–2559, doi:10.1175/15200469(1996)053<2546:IOTOQI>2.0.CO;2.
Randel, W. J., R. Garcia, N. Calvo, and D. Marsh (2009), ENSO influence on zonal mean temperature and ozone in the tropical lower stratosphere, Geophys. Res. Lett., 36, L15822, doi:10.1029/2009GL039343.
Rayner, N. A., D. E. Parker, E. B. Horton, C. K. Folland, L. V. Alexander, D. P. Rowell, E. C. Kent, and A. Kaplan (2003), Global analyses of sea surface temperature, sea ice, and night marine air temperature since the late nineteenth century, J. Geophys. Res., 108(D14), 4407, doi:10.1029/2002JD002670.
Sassi, F., D. Kinnison, B. A. Boville, R. R. García, and R. Roble (2004), Effects of El Niño-Southern Oscillation on the dynamical, thermal and chemical structure of the middle atmosphere, J. Geophys. Res., 109, D17108, doi:10.1029/2003JD004434.
Stratospheric Processes and Their Role in Climate Chemistry-Climate Models Validation Group (SPARC CCMVal) (2010), Report on the evaluation of Chemistry-Climate Models, SPARC Rep. 5,, WCRP-132, WMO/TD-1526, edited by V. Eyring, T. G. Shepherd, and D. W. Waugh, Zurich, Switzerland. [Available at http://www.sparc-climate.org/publications/sparc-reports/sparc-report-no5/.]
Thompson, D., M. Baldwin, and S. Solomon (2005), Stratosphere-troposphere coupling in the Southern Hemisphere, J. Clim., 62, 708–715, doi:10.1175/JAS-3321.1.
Tilmes, S., R. R. García, D. E. Kinnison, A. Gettelman, and P. J. Rasch (2009), Impact of geoengineered aerosols on the troposphere and stratosphere, J. Geophys. Res., 114, D12305, doi:10.1029/2008JD011420.
Weng, H., K. Ashok, S. K. Behera, S. A. Rao, and T. Yamagata (2007), Impacts of recent El Niño Modoki on dry/wet conditions in the Pacific rim during boreal summer, Clim. Dyn., 29, 113–129, doi:10.1007/s00382-007-0234-0.
Weng, H., K. Behera, and T. Yamagata (2009), Anomalous winter climate conditions in the Pacific rim during recent El Niño Modoki and El Niño events, Clim. Dyn., 32, 663–674, doi:10.1007/s00382-008-0394-6.
Yeh, S. H., J. S. Kug, B. Dewitte, M. H. Kwon, B. P. Kirtman, and F. F. Jin (2009), El Niño in a changing climate, Nature, 461, 511_514, doi:10.1038/nature08316.