Parameterisation of Radiative Exchange in the Urban Microscale Model PALM-4U: How Much Detail Should We Include?

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985807%3A_____%2F18%3A00505240" target="_blank" >RIV/67985807:_____/18:00505240 - isvavai.cz</a>

Result on the web

<a href="https://ams.confex.com/ams/ICUC10/meetingapp.cgi/Paper/340718" target="_blank" >https://ams.confex.com/ams/ICUC10/meetingapp.cgi/Paper/340718</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Parameterisation of Radiative Exchange in the Urban Microscale Model PALM-4U: How Much Detail Should We Include?

Original language description

IN: ICUC 2018. Abstracts. New York: American Meteorological Society, 2018. 5D.1, 13D.4. [ICUC 2018: International Conference on Urban Climate /10./ and Symposium on the Urban Environment /14./. 06.08.2018-10.08.2018, New York]. ABSTRACT: Radiative exchange within an urban area includes the exchange of diffuse and direct shortwave radiation (SW) flux from the sun, longwave radiation (LW) flux from the atmosphere, and LW emissions from urbane surfaces (pavements, walls, and roofs). In addition, SW and LW are both absorbed and reflected at urban surfaces. Vegetation (i.e. trees, shrubs) takes part in this interaction as well. However, modelling all these processes in a microscale urban climate model requires extra code development, detailed input data, and huge computer resources (memory and CPU time). Within the framework of the joint project MOSAIK, the parametrisation of radiative exchange within an urban area is implemented to develop the new urban climate model PALM-4U, based on the well-established large-eddy simulation code PALM. In this presentation, we will quantify the effect of each radiation process using this model. To this end, we will study the effect of different levels of radiation detail and multiple reflections on the radiation and energy fluxes as well as on the wind field of microscale urban simulations. Several test cases will be adopted in order to cover a wide range of urban complexity and urban surface parameters (such as urban surface. albedo and emissivity). The results of this study will answer the question raised in the title to show how much radiative exchange details can reasonably and usefully be considered in simulations.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

10509 - Meteorology and atmospheric sciences

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů