Warm Conveyor Belts in Idealized Moist Baroclinic Wave Simulations*
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| 出版年: | Journal of the Atmospheric Sciences vol. 70, no. 2 (Feb 2013), p. 627-652 |
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| その他の著者: | , |
| 出版事項: |
American Meteorological Society
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| オンライン･アクセス: | Citation/Abstract Full Text |
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| 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 Feature | ||
| 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 finiteamplitude 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. [PUBLICATION ABSTRACT] | |
| 653 | |a Cyclones | ||
| 653 | |a Meteorology | ||
| 653 | |a Cold | ||
| 653 | |a Studies | ||
| 653 | |a Simulation | ||
| 653 | |a Troposphere | ||
| 653 | |a Kinetic energy | ||
| 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. 627-652 | |
| 786 | 0 | |d ProQuest |t Science Database | |
| 856 | 4 | 1 | |3 Citation/Abstract |u https://www.proquest.com/docview/1317402006/abstract/embedded/7BTGNMKEMPT1V9Z2?source=fedsrch |
| 856 | 4 | 0 | |3 Full Text |u https://www.proquest.com/docview/1317402006/fulltext/embedded/7BTGNMKEMPT1V9Z2?source=fedsrch |