Warm Conveyor Belts in Idealized Moist Baroclinic Wave Simulations
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| Publicado en: | Journal of the Atmospheric Sciences vol. 70, no. 2 (Feb 2013), p. 627 |
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| Otros Autores: | , |
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American Meteorological Society
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| Acceso en línea: | Citation/Abstract Full Text + Graphics Full Text - PDF |
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| 024 | 7 | |a 10.1175/JAS-D-12-0147.1 |2 doi | |
| 035 | |a 2821359515 | ||
| 045 | 2 | |b d20130201 |b d20130228 | |
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| 100 | 1 | |a Schemm, Sebastian | |
| 245 | 1 | |a Warm Conveyor Belts in Idealized Moist Baroclinic Wave Simulations | |
| 260 | |b American Meteorological Society |c Feb 2013 | ||
| 513 | |a Journal Article | ||
| 520 | 3 | |a This idealized modeling study of moist baroclinic waves addresses the formation of moist ascending airstreams, so-called warm conveyor belts (WCBs), their characteristics, and their significance for the downstream flow evolution. Baroclinic wave simulations are performed on the f plane, growing from a finite-amplitude upper-level potential vorticity (PV) perturbation on a zonally uniform jet stream. This nonmodal approach allows for dispersive upstream and downstream development and for studying WCBs in the primary cyclone and the downstream cyclone. A saturation adjustment scheme is used as the only difference between the dry and moist simulations, which are systematically compared using a cyclone-tracking algorithm, with an eddy kinetic energy budget analysis, and from a PV perspective. Using trajectories and a selection criterion of maximum ascent, forward- and rearward-sloping WCBs in the moist simulation are identified. No WCB is identified in the dry simulation. Forward-sloping WCBs originate in the warm sector, move into the frontal fracture region, and ascend over the bent-back front, where maximum latent heating occurs in this simulation. The outflow of these WCBs is located at altitudes with prevailing zonal winds; they hence flow anticyclonically (“forward”) into the downstream ridge. In case of a slightly weaker ascent, WCBs curve cyclonically (“rearward”) above the cyclone center. A detailed analysis of the PV evolution along the WCBs reveals PV production in the lower troposphere and destruction in the upper troposphere. Consequently, WCBs transport low-PV air into their outflow region, which contributes to the formation of distinct negative PV anomalies. They, in turn, affect the downstream flow and enhance downstream cyclogenesis. | |
| 651 | 4 | |a Northern Hemisphere | |
| 653 | |a Kinetic energy | ||
| 653 | |a Potential vorticity | ||
| 653 | |a Saturation | ||
| 653 | |a Troposphere | ||
| 653 | |a Outflow | ||
| 653 | |a Tracking | ||
| 653 | |a Cyclones | ||
| 653 | |a Simulation | ||
| 653 | |a Jet stream | ||
| 653 | |a Belt conveyors | ||
| 653 | |a Eddy kinetic energy | ||
| 653 | |a Ascent | ||
| 653 | |a Evolution | ||
| 653 | |a Experiments | ||
| 653 | |a Baroclinic waves | ||
| 653 | |a Algorithms | ||
| 653 | |a Baroclinic flow | ||
| 653 | |a Cyclogenesis | ||
| 653 | |a Anomalies | ||
| 653 | |a Upper troposphere | ||
| 653 | |a Air currents | ||
| 653 | |a Energy budget | ||
| 653 | |a Jet streams (meteorology) | ||
| 653 | |a Upper level potential vorticity | ||
| 653 | |a Warm air | ||
| 653 | |a Vorticity | ||
| 653 | |a Winds | ||
| 653 | |a Perturbation | ||
| 653 | |a Lower troposphere | ||
| 653 | |a Phase transitions | ||
| 653 | |a Zonal winds | ||
| 653 | |a Environmental | ||
| 700 | 1 | |a Wernli, Heini | |
| 700 | 1 | |a Papritz, Lukas | |
| 773 | 0 | |t Journal of the Atmospheric Sciences |g vol. 70, no. 2 (Feb 2013), p. 627 | |
| 786 | 0 | |d ProQuest |t Science Database | |
| 856 | 4 | 1 | |3 Citation/Abstract |u https://www.proquest.com/docview/2821359515/abstract/embedded/7BTGNMKEMPT1V9Z2?source=fedsrch |
| 856 | 4 | 0 | |3 Full Text + Graphics |u https://www.proquest.com/docview/2821359515/fulltextwithgraphics/embedded/7BTGNMKEMPT1V9Z2?source=fedsrch |
| 856 | 4 | 0 | |3 Full Text - PDF |u https://www.proquest.com/docview/2821359515/fulltextPDF/embedded/7BTGNMKEMPT1V9Z2?source=fedsrch |