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The development, evolution, and forc...

Grim, Joseph A.

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The development, evolution, and forcing of the rear inflow jet in bow echoes during BAMEX.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	The development, evolution, and forcing of the rear inflow jet in bow echoes during BAMEX./
作者:	Grim, Joseph A.
面頁冊數:	122 p.
附註:	Adviser: Robert Rauber.
Contained By:	Dissertation Abstracts International69-02B.
標題:	Atmospheric Sciences. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3301140
ISBN:	9780549466017

The development, evolution, and forcing of the rear inflow jet in bow echoes during BAMEX.
Grim, Joseph A.

The development, evolution, and forcing of the rear inflow jet in bow echoes during BAMEX. - 122 p.

Adviser: Robert Rauber.

Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2007.

This dissertation used observations from the Bow Echo and Mesoscale Convective Vortex Experiment (BAMEX) to study kinematic and microphysical processes within the trailing stratiform region (TSR) of mesoscale convective systems (MCSs). Multi-Doppler observations of the complete life cycle of the 29 June 2003 bow echo MCS over northern Kansas were used to diagnose kinematic forcing mechanisms for the rear inflow jet (RIJ) and to document the RIJ evolution in relation to that of the entire MCS. A non-dynamic microphysical column model was used to investigate the role of microphysical processes in creating the TSR thermodynamic structure and in contributing to the descent rate of the RIJ.

ISBN: 9780549466017Subjects--Topical Terms:

1019179
Atmospheric Sciences.

The development, evolution, and forcing of the rear inflow jet in bow echoes during BAMEX.
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245 1 4 $a The development, evolution, and forcing of the rear inflow jet in bow echoes during BAMEX.
300 $a 122 p.
500 $a Adviser: Robert Rauber.
500 $a Source: Dissertation Abstracts International, Volume: 69-02, Section: B, page: 0883.
502 $a Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2007.
520 $a This dissertation used observations from the Bow Echo and Mesoscale Convective Vortex Experiment (BAMEX) to study kinematic and microphysical processes within the trailing stratiform region (TSR) of mesoscale convective systems (MCSs). Multi-Doppler observations of the complete life cycle of the 29 June 2003 bow echo MCS over northern Kansas were used to diagnose kinematic forcing mechanisms for the rear inflow jet (RIJ) and to document the RIJ evolution in relation to that of the entire MCS. A non-dynamic microphysical column model was used to investigate the role of microphysical processes in creating the TSR thermodynamic structure and in contributing to the descent rate of the RIJ.
520 $a Strengthening of the RIJ on 29 June to 17 m s-1 was concurrent with the formation of a bow echo with two bookend vortices and lowered pressure beneath the rearward-tilted updraft. Later weakening of the RIJ to 8 m s -1 was concurrent with the weakening of the bow, the weakening and spreading of the vortices and a mid-level pressure increase. The pressure gradient induced by the vertical buoyancy distribution forced &sim;50% of the rear inflow during the formative stage, while the pressure gradient induced by the bookend vortices forced > 60% of the rear inflow during the mature and weakening stages. Except within 15 km of the convective line, the RIJ axis remained above the 0°C isotherm. Here, its descent from &sim;5 km to &sim;3 km was consistent with sublimational cooling contributing to negative buoyancy. However, as it descended through the 0°C isotherm immediately behind the leading convective line, evaporation and melting contributed to its increased descent rate up to 5 m s-1.
520 $a Simulations revealed that observations of a sharp change in the RH profile across the melting layer, from saturated air with respect to ice above to subsaturated air with respect to water below, can develop in response to microphysical processes alone. However, dynamic processes, such as sufficiently strong downdrafts, may allow the air to remain subsaturated for T < 0°C. Sensitivity tests revealed that in the absence of dynamic processes, the dichotomy in the RH field across the melting level always developed.
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791 $a Ph.D.
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