Minimum temperature differences between the meteorological screen and grass in radiative frost nights

Detalhes bibliográficos
Autor(a) principal: Vieira, Nilson Aparecido [UNESP]
Data de Publicação: 2018
Outros Autores: Caramori, Paulo Henrique, De Aguiar E Silva, Marcelo Augusto, Nitsche, Pablo Ricardo
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.5433/1679-0359.2018v39n6p2337
http://hdl.handle.net/11449/221219
Resumo: A phenomenon called thermal inversion, in which there is the accumulation of colder and denser air in the layers closer to the soil, occurs in radiative frost nights, resulting in a temperature gradient with differences between the meteorological screen and grass, which vary depending on cooling conditions. Knowing this temperature difference assists in taking preventive measures against radiative frosts, as well as in estimating the probability of their occurrences. In this context, this study aimed to verify the adjustment of different probability distributions to determine the differences between the minimum temperature measured in the meteorological screen and grass temperature below 0 °C for eight regions of the Paraná State, as well as the probability of occurring these differences and adjust estimation equations of grass temperature from minimum air temperature. Temperature differences between the screen and grass were calculated and probability distributions of their occurrences were adjusted in order to determine risks per intervals of temperature differences. Estimation equations of grass temperature were adjusted from minimum screen temperatures. Average gradients of minimum temperature were observed between the screen and grass ranging from 4.2 to 6.3 °C in the analyzed regions. The average temperature difference measured in the meteorological screen and grass for the Paraná State was 5 °C. The probabilistic model of normal distribution is the most suitable for determining the probability of occurring the differences between the screen and grass temperatures for the Paraná State. Regional relief and climate conditions influence the magnitude of the minimum temperature gradient measured in the meteorological screen and grass. Estimation equations can be useful to determine the grass temperature based on the minimum air temperature for periods in which there is no such data and thus provide a subsidy for studies of risk analysis of frosts. The results of this analysis are empirical and the equations should be used in regions in which they were adjusted aiming at a higher accuracy.
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spelling Minimum temperature differences between the meteorological screen and grass in radiative frost nightsDiferenças de temperatura mínima entre o abrigo meteorológico e a relva em noites com geadasFrost riskGrass temperatureTemperature gradientThermal inversionA phenomenon called thermal inversion, in which there is the accumulation of colder and denser air in the layers closer to the soil, occurs in radiative frost nights, resulting in a temperature gradient with differences between the meteorological screen and grass, which vary depending on cooling conditions. Knowing this temperature difference assists in taking preventive measures against radiative frosts, as well as in estimating the probability of their occurrences. In this context, this study aimed to verify the adjustment of different probability distributions to determine the differences between the minimum temperature measured in the meteorological screen and grass temperature below 0 °C for eight regions of the Paraná State, as well as the probability of occurring these differences and adjust estimation equations of grass temperature from minimum air temperature. Temperature differences between the screen and grass were calculated and probability distributions of their occurrences were adjusted in order to determine risks per intervals of temperature differences. Estimation equations of grass temperature were adjusted from minimum screen temperatures. Average gradients of minimum temperature were observed between the screen and grass ranging from 4.2 to 6.3 °C in the analyzed regions. The average temperature difference measured in the meteorological screen and grass for the Paraná State was 5 °C. The probabilistic model of normal distribution is the most suitable for determining the probability of occurring the differences between the screen and grass temperatures for the Paraná State. Regional relief and climate conditions influence the magnitude of the minimum temperature gradient measured in the meteorological screen and grass. Estimation equations can be useful to determine the grass temperature based on the minimum air temperature for periods in which there is no such data and thus provide a subsidy for studies of risk analysis of frosts. The results of this analysis are empirical and the equations should be used in regions in which they were adjusted aiming at a higher accuracy.Programa de Pós-Graduação em Engenharia de Sistemas Agrícolas Universidade Estadual de São Paulo USP Escola Superior de Agricultura “Luiz de Queiroz” ESALQÁrea de Ecofisiologia Instituto Agronômico do Paraná IAPARDepartamento de Agronomia Universidade Estadual de Londrina UELPrograma de Pós-Graduação em Engenharia de Sistemas Agrícolas Universidade Estadual de São Paulo USP Escola Superior de Agricultura “Luiz de Queiroz” ESALQUniversidade Estadual Paulista (UNESP)IAPARUniversidade Estadual de Londrina (UEL)Vieira, Nilson Aparecido [UNESP]Caramori, Paulo HenriqueDe Aguiar E Silva, Marcelo AugustoNitsche, Pablo Ricardo2022-04-28T19:26:53Z2022-04-28T19:26:53Z2018-11-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article2337-2349http://dx.doi.org/10.5433/1679-0359.2018v39n6p2337Semina:Ciencias Agrarias, v. 39, n. 6, p. 2337-2349, 2018.1679-03591676-546Xhttp://hdl.handle.net/11449/22121910.5433/1679-0359.2018v39n6p23372-s2.0-85057728961Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengSemina:Ciencias Agrariasinfo:eu-repo/semantics/openAccess2022-04-28T19:26:53Zoai:repositorio.unesp.br:11449/221219Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T16:43:49.926543Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Minimum temperature differences between the meteorological screen and grass in radiative frost nights
Diferenças de temperatura mínima entre o abrigo meteorológico e a relva em noites com geadas
title Minimum temperature differences between the meteorological screen and grass in radiative frost nights
spellingShingle Minimum temperature differences between the meteorological screen and grass in radiative frost nights
Vieira, Nilson Aparecido [UNESP]
Frost risk
Grass temperature
Temperature gradient
Thermal inversion
title_short Minimum temperature differences between the meteorological screen and grass in radiative frost nights
title_full Minimum temperature differences between the meteorological screen and grass in radiative frost nights
title_fullStr Minimum temperature differences between the meteorological screen and grass in radiative frost nights
title_full_unstemmed Minimum temperature differences between the meteorological screen and grass in radiative frost nights
title_sort Minimum temperature differences between the meteorological screen and grass in radiative frost nights
author Vieira, Nilson Aparecido [UNESP]
author_facet Vieira, Nilson Aparecido [UNESP]
Caramori, Paulo Henrique
De Aguiar E Silva, Marcelo Augusto
Nitsche, Pablo Ricardo
author_role author
author2 Caramori, Paulo Henrique
De Aguiar E Silva, Marcelo Augusto
Nitsche, Pablo Ricardo
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (UNESP)
IAPAR
Universidade Estadual de Londrina (UEL)
dc.contributor.author.fl_str_mv Vieira, Nilson Aparecido [UNESP]
Caramori, Paulo Henrique
De Aguiar E Silva, Marcelo Augusto
Nitsche, Pablo Ricardo
dc.subject.por.fl_str_mv Frost risk
Grass temperature
Temperature gradient
Thermal inversion
topic Frost risk
Grass temperature
Temperature gradient
Thermal inversion
description A phenomenon called thermal inversion, in which there is the accumulation of colder and denser air in the layers closer to the soil, occurs in radiative frost nights, resulting in a temperature gradient with differences between the meteorological screen and grass, which vary depending on cooling conditions. Knowing this temperature difference assists in taking preventive measures against radiative frosts, as well as in estimating the probability of their occurrences. In this context, this study aimed to verify the adjustment of different probability distributions to determine the differences between the minimum temperature measured in the meteorological screen and grass temperature below 0 °C for eight regions of the Paraná State, as well as the probability of occurring these differences and adjust estimation equations of grass temperature from minimum air temperature. Temperature differences between the screen and grass were calculated and probability distributions of their occurrences were adjusted in order to determine risks per intervals of temperature differences. Estimation equations of grass temperature were adjusted from minimum screen temperatures. Average gradients of minimum temperature were observed between the screen and grass ranging from 4.2 to 6.3 °C in the analyzed regions. The average temperature difference measured in the meteorological screen and grass for the Paraná State was 5 °C. The probabilistic model of normal distribution is the most suitable for determining the probability of occurring the differences between the screen and grass temperatures for the Paraná State. Regional relief and climate conditions influence the magnitude of the minimum temperature gradient measured in the meteorological screen and grass. Estimation equations can be useful to determine the grass temperature based on the minimum air temperature for periods in which there is no such data and thus provide a subsidy for studies of risk analysis of frosts. The results of this analysis are empirical and the equations should be used in regions in which they were adjusted aiming at a higher accuracy.
publishDate 2018
dc.date.none.fl_str_mv 2018-11-01
2022-04-28T19:26:53Z
2022-04-28T19:26:53Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.5433/1679-0359.2018v39n6p2337
Semina:Ciencias Agrarias, v. 39, n. 6, p. 2337-2349, 2018.
1679-0359
1676-546X
http://hdl.handle.net/11449/221219
10.5433/1679-0359.2018v39n6p2337
2-s2.0-85057728961
url http://dx.doi.org/10.5433/1679-0359.2018v39n6p2337
http://hdl.handle.net/11449/221219
identifier_str_mv Semina:Ciencias Agrarias, v. 39, n. 6, p. 2337-2349, 2018.
1679-0359
1676-546X
10.5433/1679-0359.2018v39n6p2337
2-s2.0-85057728961
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Semina:Ciencias Agrarias
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 2337-2349
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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