The Potential Vorticity Structure and Dynamics of African Easterly Waves
The dynamics of African easterly waves (AEWs) are investigated from the perspective of potential vorticity (PV) using data from global reanalysis projects. To a leading order, AEW evolution is governed by four processes: advection of the wave-scale PV by background flow, advection of background PV b...
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| Veröffentlicht in: | Journal of the atmospheric sciences 2020-03, Vol.77 (3), p.871-890 |
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| creator | Russell, James O. H. Aiyyer, Anantha |
| description | The dynamics of African easterly waves (AEWs) are investigated from the perspective of potential vorticity (PV) using data from global reanalysis projects. To a leading order, AEW evolution is governed by four processes: advection of the wave-scale PV by background flow, advection of background PV by the AEW, diabatic forcing due to wave-scale moist convection, and coupling between the wave and background diabatic forcing. Moist convection contributes significantly to the growth of AEWs in the midtroposphere, and to both growth and propagation of AEWs near the surface. The former is associated with stratiform clouds while the latter with deep convection. Moist convection helps maintain a more upright AEW PV column against the background shear, which makes the wave structure conducive for tropical cyclogenesis. It is also argued that—contrary to the hypothesis in some prior studies—the canonical diabatic Rossby wave model is likely not applicable to AEWs. |
| doi_str_mv | 10.1175/JAS-D-19-0019.1 |
| format | Article |
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It is also argued that—contrary to the hypothesis in some prior studies—the canonical diabatic Rossby wave model is likely not applicable to AEWs.</description><identifier>ISSN: 0022-4928</identifier><identifier>EISSN: 1520-0469</identifier><identifier>DOI: 10.1175/JAS-D-19-0019.1</identifier><language>eng</language><publisher>Boston: American Meteorological Society</publisher><subject>Advection ; African easterly waves ; Columnar structure ; Convection ; Cyclogenesis ; Cyclones ; Datasets ; Dynamic structural analysis ; Dynamics ; Easterly waves ; Moist convection ; Planetary waves ; Potential vorticity ; Precipitation ; Rossby waves ; Stratiform clouds ; Studies ; Tropical climate ; Tropical cyclogenesis ; Vorticity</subject><ispartof>Journal of the atmospheric sciences, 2020-03, Vol.77 (3), p.871-890</ispartof><rights>Copyright American Meteorological Society Mar 2020</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c269t-95977e219b159664f3f17321f1b3db95d3e9191ffad6e5e294bd25821a8aeb7b3</citedby><cites>FETCH-LOGICAL-c269t-95977e219b159664f3f17321f1b3db95d3e9191ffad6e5e294bd25821a8aeb7b3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,777,781,3668,27905,27906</link.rule.ids></links><search><creatorcontrib>Russell, James O. 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Moist convection helps maintain a more upright AEW PV column against the background shear, which makes the wave structure conducive for tropical cyclogenesis. 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| subjects | Advection African easterly waves Columnar structure Convection Cyclogenesis Cyclones Datasets Dynamic structural analysis Dynamics Easterly waves Moist convection Planetary waves Potential vorticity Precipitation Rossby waves Stratiform clouds Studies Tropical climate Tropical cyclogenesis Vorticity |
| title | The Potential Vorticity Structure and Dynamics of African Easterly Waves |
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