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Sensitivity Analysis of the Mesoscale Air Pollution Model TAPM
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
2006 (English)Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Known problems with the air pollution model, TAPM’s meteorological predictions

over the Canterbury Plains, New Zealand, has been its lack of ability to

simulate low nocturnal stagnant wind speeds, certain wind field directions as

well as greatly overestimating the sensible heat flux. The aim of this thesis

has been to reduce these known disagreements along with other meteorological

parameters in attempt to optimize TAPM’s predictions for New Zealand conditions.

The methodology used to obtain better agreement with observational

data during a four-day period (1-4 of August 2000) was to modify certain initial

parameters. These parameters were the deep soil volumetric moisture content,

the deep soil temperature, the sea surface temperature, the synoptic pressure

gradient scaling factor, and to include rain processes or not in the simulations.

It is found that including rain processes and increasing the deep soil volumetric

moisture content (at least during wintertime) do improve the simulations performance.

 

Abstract [sv]

Från tidigare studier med luftföroreningsmodellen TAPMs meteorologiska

prognoser över Canterburys slätter, i Nya Zeeland, har man funnit problem.

Dess brister har bestått i svårigheter att simulera de nattetid svaga och stagnerande

vindhastigheter, vissa riktningar i vindfältet samt grov överskattning av

det sensibla värmaflödet. Målet med denna rapport har varit att reducera dessa

kända avvikelser tillsammans med andra meteorologiska parametrar i ett försök

att optimera TAPMs prognoser för förhållandena över Nya Zeeland. Metodiken

som används för att uppnå bättre överensstämmelse med observationsdatan från

en fyradagarsperiod, 1-4 augusti år 2000, var att modifiera vissa specifika initieringparametrar.

Dessa parametrar var den djupgående markfuktigheten, den

djupgående marktemperaturen, havsytans temperatur, det synoptiska tryckets

skalningsfaktor. Det undersöktes också om man skulle inkludera nederbördsprocesser

eller inte i simuleringarna. Resultaten visade att en inkludering av

nederbördsprocesser samt en ökning av den djupa markfuktigheten (åtminstone

vintertid) verkar förbättra kvalitéten på simuleringarnas resultat.

Place, publisher, year, edition, pages
2006.
Series
Examensarbete vid Institutionen för geovetenskaper
Keyword [en]
air pollution simulation, model evaluation, land-air interaction
National Category
Meteorology and Atmospheric Sciences
Identifiers
URN: urn:nbn:se:uu:diva-303877OAI: oai:DiVA.org:uu-303877DiVA: diva2:974308
Subject / course
Meteorology
Available from: 2016-10-04 Created: 2016-09-26 Last updated: 2016-10-04Bibliographically approved

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