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CREATED:20260810T105926Z
DESCRIPTION:Interactions between water vapor, potential vorticity, and vertical wind shear in rotational tropical disturbances: Insights from a simple model\n\nDr. Angel F. Adames-Corraliza\n\nAssistant Professor\n\nDepartment of Atmospheric and Oceanic Sciences\n\nUniversity of Wisconsin-Madison\n\nDate: Wednesday, October 21, 2020\n\nTime: 3:30 p.m. HST\n\nZoom Meeting: https://hawaii.zoom.us/j/97454168193\n\nMeeting ID: 974 5416 8193\n\nPasscode: 207183\n\nAbstract:\n\nA linear two-layermodel is used to elucidate the role of prognostic moisture on quasi-geostrophic(QG) motions in the presence of a mean thermal wind. Solutions to the basicequations reveal two instabilities.  The well-documentedbaroclinic instability is characterized by growth at the synoptic scale(horizontal scale of?1000 km) and systems that grow from this instability tilt against theshear.  Moisture-vortex instability —aninstability that occurs when moisture and lower-tropospheric vorticity exhibitan in-phase component— exists only when moisture is prognostic.  The instability is also strongest at thesynoptic scale, but systems that grow from it exhibit a vertically-stacked structure.  When moisture is prognostic, baroclinicinstability exhibits a pronounced weakening when the thermal wind is easterly.On the other hand, moisture-vortex instability is strongest in this mean state.Based on these results, it is hypothesized that moisture-vortex instability isthe dominant instability in humid regions of easterly thermal wind such as theSouth Asian and African monsoons.
DTEND;TZID=Pacific/Honolulu:20201022T023000Z
DTSTAMP:20260810T105926Z
DTSTART;TZID=Pacific/Honolulu:20201022T013000Z
LAST-MODIFIED:20260810T105926Z
LOCATION:Virtual Meeting
PRIORITY:5
SEQUENCE:0
SUMMARY;LANGUAGE=en-us:Atmospheric Sciences Seminar
TRANSP:OPAQUE
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