Thermal belt and cold air drainage on the mountain slope and cold air lake in the basin at quiet, clear night

Yoshino, Masatoshi

doi:10.1007/bf00446473

Cited by 47 publications

(38 citation statements)

References 20 publications

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“…Defant 1949;Ball 1956;Yoshino 1984), with cold-air gravity flows of 2-3 m s −1 (Oke 1987), and speed depending on the depth of the cold-air layer, the terrain slope, air temperature and surface roughness. The flow is generally organized in cold-air 'drops', i.e.…”

Section: Introductionmentioning

confidence: 99%

Capturing Cold-Air Flow Using Thermal Imaging

Grudzielanek

Čermák

2015

Boundary-Layer Meteorol

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We present a thermal imaging field design for climatological studies with an application to microscale cold-air flow analysis. Measurements of microclimatic processes are often limited by a lack of spatial coherence and consequently incomplete information on spatial and temporal patterns in the airflow. We introduce and evaluate an approach for investigating cold-air flow using an infrared camera pointed at a custom-built projection screen. A statistical analysis of a cold-air-flow case study is presented that explores the potential and limitations of the proposed technique. Results indicate good compatibility with traditional methods, while spatial coherence in measurements is achieved. A few examples of additional information obtained from the thermal camera analysis are presented, including analyses of cold-air-flow characteristics.

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Section: Introductionmentioning

confidence: 99%

Capturing Cold-Air Flow Using Thermal Imaging

Grudzielanek

Čermák

2015

Boundary-Layer Meteorol

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“…3) -,especialmente com condições de tempo de fraca nebulosidade ou ausência denúvens. Os vales são, então, por excelência, áreas de forte incidência de inversões térmicas e por isso de condições privilegiadas de acumulação de poluentes (M. M. YOSHINO, 1984).…”

Section: Temperatura -----> Temperatura ------->unclassified

Condições teóricas de dispersão atmosférica de poluentes na área de Coimbra - Souselas - a perspectiva topoclimática da implantação de uma co-incineradora de resíduos tóxicos em Souselas

Ganho

1999

TER

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A navegação consulta e descarregamento dos títulos inseridos nas Bibliotecas Digitais UC Digitalis, UC Pombalina e UC Impactum, pressupõem a aceitação plena e sem reservas dos Termos e Condições de Uso destas Bibliotecas Digitais, disponíveis em https://digitalis.uc.pt/pt-pt/termos.Conforme exposto nos referidos Termos e Condições de Uso, o descarregamento de títulos de acesso restrito requer uma licença válida de autorização devendo o utilizador aceder ao(s) documento(s) a partir de um endereço de IP da instituição detentora da supramencionada licença.Ao utilizador é apenas permitido o descarregamento para uso pessoal, pelo que o emprego do(s) título(s) descarregado(s) para outro fim, designadamente comercial, carece de autorização do respetivo autor ou editor da obra.Na medida em que todas as obras da UC Digitalis se encontram protegidas pelo Código do Direito de Autor e Direitos Conexos e demais legislação aplicável, toda a cópia, parcial ou total, deste documento, nos casos em que é legalmente admitida, deverá conter ou fazer-se acompanhar por este aviso.Condições teóricas de dispersão atmosférica de poluentes na área de CoimbraSouselas: a perspectiva topoclimática da implantação de uma co-incineradora de resíduos tóxicos em Souselas Autor(es):Ganho, Nuno Condições teóricas de dispersão atmosférica de poluentes na área de Coimbra -Souselas -A perspectiva topoclimática da implantação de uma co-incineradora de resíduos tóxicos em Souselas.Nuno Ganho* Resumo:Neste artigo analisam-se as condições teóricas de dispersão de poluentes na área urbana de Coimbra-Souselas, na perspectiva topoclimática, relacionadas com a potencial implantação de uma co-incineradora de resíduos tóxicos em Souselas.Palavras chave:Topoclirnatologia, dispersão de poluentes, co-incineração, Coimbra-Souselas. Résumé:Dans cet article on analyse les conditions théoriques de dispersion de polluants dans I 'aire urbaine de Coimbra--Souselas, dans la perspective topoclimatique, en relation avec la potentiel implantation d'une co-incinératrice de residus toxiques à Souselas. Mots clés:Topoclirnatologie, dispertion de polluants, co-incinération, Coimbra-Souselas.Abstract:In this paper we analyse the theoretical conditions o f pollutants diffusion in the urban area o f Coimbra-Souselas, in the topoclimatic perspective, related to a potential implantation o f toxical residues co-incinerator in Souselas.

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“…Slopes with larger vertical extent may be characterized by a thermal belt where the surface air temperature reaches a maximum, often a few hundred meters above the valley floor (Yoshino 1975). Above the thermal belt, the surface air temperature decreases with surface height and may be influenced by the vertical temperature gradient of the free atmosphere.…”

Section: Introductionmentioning

confidence: 98%

“…Acevedo and Fitzjarrald (2001) relate the nocturnal air temperature to the deviation of the surface height from a small-scale average. The effect of terrain curvature may correspond to flow of cold-air drainage over the top of the trapped colder air at the bottom of the slope (e.g., Heywood 1933;Yoshino 1975;Mahrt et al 2001). Mahrt and Heald (1983) found that the nocturnal surface radiation temperature was more closely related to terrain curvature than surface elevation over undulating terrain.…”

Section: Introductionmentioning

confidence: 99%

Variation of Surface Air Temperature in Complex Terrain

Mahrt

2006

Journal of Applied Meteorology and Climatology

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Data from three micronetworks with eddy correlation data and three additional micronetworks without eddy correlation data are analyzed to study the spatial variability of surface air temperature in complex terrain. A simple similarity relationship is constructed to relate the spatial variation of air temperature along the slope to the thermal forcing and mixing. Mixing is not included in present empirical formulations of the surface air temperature distribution in complex terrain. The development of surface temperature gradients along the slope, resulting from surface heating or cooling, is bounded by a maximum (or saturated) value, where a further increase of temperature gradients is restricted by redistribution of heat by thermally driven slope circulations. Although much of the spatial variation of the surface air temperature is governed by complex three-dimensionality and surface vegetation, a relatively simple relationship is able to account for much of the diurnal and day-to-day variation of the spatial distribution of air temperature. This relationship requires information on the surface heat flux and friction velocity over a reference surface. Required generalizations of the relationship are outlined before it can be applied to an arbitrary site.

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Thermal belt and cold air drainage on the mountain slope and cold air lake in the basin at quiet, clear night

Cited by 47 publications

References 20 publications

Capturing Cold-Air Flow Using Thermal Imaging

Capturing Cold-Air Flow Using Thermal Imaging

Condições teóricas de dispersão atmosférica de poluentes na área de Coimbra - Souselas - a perspectiva topoclimática da implantação de uma co-incineradora de resíduos tóxicos em Souselas

Variation of Surface Air Temperature in Complex Terrain

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