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Investigation of stable and unstable...

University of Maryland, Baltimore County., Physics, Atmospheric.

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Investigation of stable and unstable boundary layer phenomena using observations and a numerical weather prediction model.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Investigation of stable and unstable boundary layer phenomena using observations and a numerical weather prediction model./
Author:	Weldegaber, Mengsteab H.
Description:	195 p.
Notes:	Adviser: Lynn C. Sparling.
Contained By:	Dissertation Abstracts International70-06B.
Subject:	Atmospheric Sciences. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3359094
ISBN:	9781109186864

Investigation of stable and unstable boundary layer phenomena using observations and a numerical weather prediction model.
Weldegaber, Mengsteab H.

Investigation of stable and unstable boundary layer phenomena using observations and a numerical weather prediction model. - 195 p.

Adviser: Lynn C. Sparling.

Thesis (Ph.D.)--University of Maryland, Baltimore County, 2009.

Despite significant advances in the simulation of synoptic scale weather events, current numerical weather prediction models show poor skill in their capability to accurately simulate sub-grid scale processes, such as cloud-precipitation processes and planetary boundary layer (PBL) evolution, because too many semi-empirical parameterizations are involved. The goal of the work presented here is to evaluate the next-generation mesoscale Weather Research and Forecasting (WRF) model in simulating mesoscale weather phenomena under different PBL stratifications. The work presented in this thesis investigates the performance of the state-of-the-art mesoscale WRF model in simulating the structure and development of a daytime convective boundary layer phenomenon, (the dryline over the Southern Great Plains), and a nocturnal stable boundary layer phenomenon, (the low level jet (LLJ) over the Mid-Atlantic region). The dryline and LLJ are two examples of boundary layer phenomena that occur under very different conditions and thus together they provide a good test of the PBL dynamics in the model. Extensive, high spatial and temporal resolution data collected during these case studies is used to evaluate the numerical results. For the unstable boundary layer, a detailed observational analysis of a non-convective dryline investigates an incorrect forecast. For the stable boundary layer, the accuracy of the timing and spatial characteristics of the LLJ for different PBL parameterizations is investigated and discussed in terms of the LLJ forcing mechanisms.

ISBN: 9781109186864Subjects--Topical Terms:

1019179
Atmospheric Sciences.

Investigation of stable and unstable boundary layer phenomena using observations and a numerical weather prediction model.
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005 20100701
008 100701s2009 ||||||||||||||||| ||eng d
020 $a 9781109186864
035 $a (UMI)AAI3359094
035 $a AAI3359094
040 $a UMI $c UMI
100 1 $a Weldegaber, Mengsteab H. $3 1019587
245 1 0 $a Investigation of stable and unstable boundary layer phenomena using observations and a numerical weather prediction model.
300 $a 195 p.
500 $a Adviser: Lynn C. Sparling.
500 $a Source: Dissertation Abstracts International, Volume: 70-06, Section: B, page: .
502 $a Thesis (Ph.D.)--University of Maryland, Baltimore County, 2009.
520 $a Despite significant advances in the simulation of synoptic scale weather events, current numerical weather prediction models show poor skill in their capability to accurately simulate sub-grid scale processes, such as cloud-precipitation processes and planetary boundary layer (PBL) evolution, because too many semi-empirical parameterizations are involved. The goal of the work presented here is to evaluate the next-generation mesoscale Weather Research and Forecasting (WRF) model in simulating mesoscale weather phenomena under different PBL stratifications. The work presented in this thesis investigates the performance of the state-of-the-art mesoscale WRF model in simulating the structure and development of a daytime convective boundary layer phenomenon, (the dryline over the Southern Great Plains), and a nocturnal stable boundary layer phenomenon, (the low level jet (LLJ) over the Mid-Atlantic region). The dryline and LLJ are two examples of boundary layer phenomena that occur under very different conditions and thus together they provide a good test of the PBL dynamics in the model. Extensive, high spatial and temporal resolution data collected during these case studies is used to evaluate the numerical results. For the unstable boundary layer, a detailed observational analysis of a non-convective dryline investigates an incorrect forecast. For the stable boundary layer, the accuracy of the timing and spatial characteristics of the LLJ for different PBL parameterizations is investigated and discussed in terms of the LLJ forcing mechanisms.
590 $a School code: 0434.
650 4 $a Atmospheric Sciences. $3 1019179
690 $a 0725
710 2 $a University of Maryland, Baltimore County. $b Physics, Atmospheric. $3 1019586
773 0 $t Dissertation Abstracts International $g 70-06B.
790 $a 0434
790 1 0 $a Bacmeister, Julio T. $e committee member
790 1 0 $a Demoz, Belay B. $e committee member
790 1 0 $a Hoff, Raymond M. $e committee member
790 1 0 $a McMillan, Wallace W. $e committee member
790 1 0 $a Sparling, Lynn C., $e advisor
791 $a Ph.D.
792 $a 2009
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3359094