Dynamical mechanism for the increase in tropical upwelling in the lowermost tropical stratosphere during warm ENSO events
| dc.contributor.author | Calvo Fernández, Natalia | |
| dc.contributor.author | García, R. R. | |
| dc.contributor.author | Randel, W. J. | |
| dc.contributor.author | Marsh, D. R. | |
| dc.date.accessioned | 2023-06-20T03:40:08Z | |
| dc.date.available | 2023-06-20T03:40:08Z | |
| dc.date.issued | 2010-07 | |
| dc.description | © 2010 American Meteorological Society. The National Center for Atmospheric Research is sponsored by the National Science Foundation. N. Calvo was supported by the Spanish Ministry of Education and Science, the Fulbright Commission in Spain, and the visitors' program of the Atmospheric Chemistry Division at the National Center for Atmospheric Research (NCAR). She was also partially supported by the Spanish Ministry of Education and Sciences under Contract CGL2007-65891-C05-02/CLI (TRODIM project). WACCM calculations presented in this paper were carried out at NCAR; at the NASA Advanced Supercomputing Division, Ames Research Center; and at the Oak Ridge Leadership Computing Facility of the U. S. Department of Energy. | |
| dc.description.abstract | The Brewer-Dobson circulation strengthens in the lowermost tropical stratosphere during warm El Nino-Southern Oscillation (ENSO) events. Dynamical analyses using the most recent version of the Whole Atmosphere Community Climate Model show that this is due mainly to anomalous forcing by orographic gravity waves, which maximizes in the Northern Hemisphere subtropics between 18 and 22 km, especially during the strongest warm ENSO episodes. Anomalies in the meridional gradient of temperature in the upper troposphere and lower stratosphere (UTLS) are produced during warm ENSO events, accompanied by anomalies in the location and intensity of the subtropical jets. This anomalous wind pattern alters the propagation and dissipation of the parameterized gravity waves, which ultimately force increases in tropical upwelling in the lowermost stratosphere. During cold ENSO events a similar signal, but of opposite sign, is present in the model simulations. The signals in ozone and water vapor produced by ENSO events in the UTLS are also investigated. | |
| dc.description.department | Depto. de Física de la Tierra y Astrofísica | |
| dc.description.faculty | Fac. de Ciencias Físicas | |
| dc.description.refereed | TRUE | |
| dc.description.sponsorship | National Science Foundation | |
| dc.description.sponsorship | Spanish Ministry of Education and Science | |
| dc.description.sponsorship | Fulbright Commission in Spain | |
| dc.description.sponsorship | Atmospheric Chemistry Division at the National Center for Atmospheric Research (NCAR) | |
| dc.description.status | pub | |
| dc.eprint.id | https://eprints.ucm.es/id/eprint/25524 | |
| dc.identifier.doi | 10.1175/2010JAS3433.1 | |
| dc.identifier.issn | 0022-4928 | |
| dc.identifier.officialurl | http://dx.doi.org/10.1175/2010JAS3433.1 | |
| dc.identifier.relatedurl | http://journals.ametsoc.org/ | |
| dc.identifier.uri | https://hdl.handle.net/20.500.14352/44205 | |
| dc.issue.number | 7 | |
| dc.journal.title | Journal of the Atmospheric Sciences | |
| dc.language.iso | eng | |
| dc.page.final | 2340 | |
| dc.page.initial | 2331 | |
| dc.publisher | American Meteorological Society | |
| dc.relation.projectID | CGL2007-65891-C05-02/CLI | |
| dc.rights.accessRights | open access | |
| dc.subject.cdu | 52 | |
| dc.subject.keyword | General-Circulation | |
| dc.subject.keyword | Temperatures | |
| dc.subject.keyword | Model | |
| dc.subject.ucm | Astrofísica | |
| dc.subject.ucm | Astronomía (Física) | |
| dc.subject.ucm | Física atmosférica | |
| dc.subject.unesco | 2501 Ciencias de la Atmósfera | |
| dc.title | Dynamical mechanism for the increase in tropical upwelling in the lowermost tropical stratosphere during warm ENSO events | |
| dc.type | journal article | |
| dc.volume.number | 67 | |
| dcterms.references | Andrews, D. G., J. R. Holton, and C. B. Leovy, 1987: Middle Atmosphere Dynamics. Elsevier, 489 pp. Calvo Fernández, N., R. García, R. García Herrera, D. Gallego Puyol, L. Gimeno Presa, E. Hernández Martín, and P. Ribera Rodríguez, 2004: Analysis of the ENSO signal in tropospheric and stratospheric temperatures observed by MSU, 1979–2000. J. Climate, 17, 3934–3946. García, R. R., and W. J. Randel, 2008: Acceleration of the Brewer–Dobson circulation due to increases in greenhouse gases. J. Atmos. Sci., 65, 2731–2739. ——,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. 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. Haynes, P. H., C. J. Marks, M. E. McIntyre, T. G. Sheperd, and K. P. Shine, 1991: On the ‘‘downward control’’ of extratropical diabatic circulations by eddy-induced mean zonal forces. J. Atmos. Sci., 48, 651–678. 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. Climate, 19, 3863–3881. Marsh, D. R., and R. R. García, 2007: Attribution of decadal variability in lower-stratospheric tropical ozone. Geophys. Res. Lett., 34, L21807, doi:10.1029/2007GL030935. 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. McFarlane, N. A., 1987: The effect of orographically excited gravity wave drag on the general circulation of the lower stratosphere and troposphere. J. Atmos. Sci., 44, 1775–1800. Park, M., W. J. Randel, D. E. Kinnison, R. R. García, and W. Choi, 2004: Seasonal variation of methane, water vapor, and nitrogen oxides near the tropopause: Satellite observations and model simulations. J. Geophys. Res., 109, D03302, doi:10.1029/ 2003JD003706. 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. ——, R. R. García, N. Calvo, and D. Marsh, 2009: ENSO influence on zonal mean temperature and ozone in the tropical lower stratosphere. J. Geophys. Res., 36, L15822, doi:10.1029/ 2009GL039343. Richter, J. H., F. Sassi, and R. R. Garcia, 2010: Toward a physically based gravity wave source parameterization in a general circulation model. J. Atmos. Sci., 67, 136–156. Sassi, F., D. E. Kinnison, B. A. Boville, R. R. Garcia, and R.R. Roble, 2004: Effect 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. 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. Yulaeva, E., and J. M. Wallace, 1994: The signature of ENSO in global temperature and precipitation fields derived from the Microwave Sounding Unit. J. Climate, 7, 1719–1736 | |
| dspace.entity.type | Publication | |
| relation.isAuthorOfPublication | 3cfa985b-0ebd-44fb-b791-312638313455 | |
| relation.isAuthorOfPublication.latestForDiscovery | 3cfa985b-0ebd-44fb-b791-312638313455 |
Download
Original bundle
1 - 1 of 1
