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dc.contributor.author
Pulido, Manuel Arturo
dc.contributor.author
Thuburn, John
dc.date.available
2017-05-19T14:58:54Z
dc.date.issued
2008-09
dc.identifier.citation
Pulido, Manuel Arturo; Thuburn, John; The seasonal cycle of gravity wave drag in the middle atmosphere; American Meteorological Society; Journal Of Climate; 21; 18; 9-2008; 4664-4679
dc.identifier.issn
0894-8755
dc.identifier.uri
http://hdl.handle.net/11336/16715
dc.description.abstract
Using a variational technique, middle atmosphere gravity wave drag (GWD) is estimated from Met Office middle atmosphere analyses for the year 2002. The technique employs an adjoint model of a middle atmosphere dynamical model to minimize a cost function that measures the differences between the model state and observations. The control variables are solely the horizontal components of GWD; therefore, the minimization determines the optimal estimate of the drag. For each month, Met Office analyses are taken as the initial condition for the first day of the month, and also as observations for each successive day. In this way a three-dimensional GWD field is obtained for the entire year with a temporal resolution of 1 day. GWD shows a pronounced seasonal cycle. During solstices, there are deceleration regions of the polar jet centered at about 63° latitude in the winter hemisphere, with a peak of 49 m s-1 day-1 at 0.24 hPa in the Southern Hemisphere; the summer hemisphere also shows a deceleration region but much weaker, with a peak of 24 m s-1 day-1 centered at 45° latitude and 0.6 hPa. During equinoxes GWD is weak and exhibits a smooth transition between the winter and summer situation. The height and latitude of the deceleration center in both winter and summer hemispheres appear to be constant. Important longitudinal dependencies in GWD are found that are related to planetary wave activity; GWD intensifies in the exit region of jet streaks. In the lower tropical stratosphere, the estimated GWD shows a westward GWD descending together with the westward phase of the quasi-biennial oscillation. Above, GWD exhibits a semiannual pattern that is approximately out of phase with the semiannual oscillation in the zonal wind. Furthermore, a descending GWD pattern is found at those heights, similar in magnitude and sign to that in the lower stratosphere.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Meteorological Society
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Gravity Waves
dc.subject
Waves Atmospheric
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Middle Atmosphere
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Seasonal Cycle
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Jets
dc.subject.classification
Meteorología y Ciencias Atmosféricas
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
The seasonal cycle of gravity wave drag in the middle atmosphere
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-05-17T13:47:22Z
dc.identifier.eissn
1520-0442
dc.journal.volume
21
dc.journal.number
18
dc.journal.pagination
4664-4679
dc.journal.pais
Estados Unidos
dc.journal.ciudad
Washington
dc.description.fil
Fil: Pulido, Manuel Arturo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Modelado e Innovación Tecnológica. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas Naturales y Agrimensura. Instituto de Modelado e Innovación Tecnologica; Argentina
dc.description.fil
Fil: Thuburn, John. University of Exeter. School of Engineering, Computing Science and Mathematics; Reino Unido
dc.journal.title
Journal Of Climate
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://ams.allenpress.com/perlserv/?request=get-pdf&doi=10.1175%2F2008JCLI2006.1
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://journals.ametsoc.org/doi/full/10.1175/2008JCLI2006.1
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1175/2008JCLI2006.1
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