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Analysis of Leaf Heat Balance Affected by Operation of a Frost Protective Fan in Tea Fields
Under climate change, frosts in agricultural fields often bring serious damage to crops. Accordingly, it is keenly desired to improve frost protection methods based on the quantitative evaluation of their effects. The method for quantifying the thermal effect brought by operation of frost protection...
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Published in: | Environment control in biology 2016, Vol.54(3), pp.125-131 |
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container_issue | 3 |
container_start_page | 125 |
container_title | Environment control in biology |
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creator | KIMURA, Kensuke MARUO, Kyosuke OOKI, Takahiro NAKAZONO, Kentaro MATSUO, Kiyoshi KITANO, Masaharu |
description | Under climate change, frosts in agricultural fields often bring serious damage to crops. Accordingly, it is keenly desired to improve frost protection methods based on the quantitative evaluation of their effects. The method for quantifying the thermal effect brought by operation of frost protection methods was newly developed based on analysis of leaf heat balance, where leaf boundary layer conductance was continuously determined in field conditions by applying artificial model leaves and a mathematical model. Reliability of the newly developed method was demonstrated in a tea field under the operation of a frost protective fan. The frost protective fan operating at the upper layer of a thermal inversion with strong radiative cooling enhanced convective heat transfer with increased the leaf boundary layer conductance and the ambient air temperature by supplying leaves with warm air. As a result, sensible and latent heat fluxes were significantly increased, which brought a rise of leaf temperature. This thermal effect brought by the fan operation was remarkably fluctuated due to the fan oscillation and advection from the surrounding field, while increasing gradually until just before sunrise when the lowest leaf temperature was observed. Thus, the newly developed method based on the heat balance analysis can be expected to contribute to the improvement of frost protection methods. |
doi_str_mv | 10.2525/ecb.54.125 |
format | article |
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Accordingly, it is keenly desired to improve frost protection methods based on the quantitative evaluation of their effects. The method for quantifying the thermal effect brought by operation of frost protection methods was newly developed based on analysis of leaf heat balance, where leaf boundary layer conductance was continuously determined in field conditions by applying artificial model leaves and a mathematical model. Reliability of the newly developed method was demonstrated in a tea field under the operation of a frost protective fan. The frost protective fan operating at the upper layer of a thermal inversion with strong radiative cooling enhanced convective heat transfer with increased the leaf boundary layer conductance and the ambient air temperature by supplying leaves with warm air. As a result, sensible and latent heat fluxes were significantly increased, which brought a rise of leaf temperature. This thermal effect brought by the fan operation was remarkably fluctuated due to the fan oscillation and advection from the surrounding field, while increasing gradually until just before sunrise when the lowest leaf temperature was observed. 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As a result, sensible and latent heat fluxes were significantly increased, which brought a rise of leaf temperature. This thermal effect brought by the fan operation was remarkably fluctuated due to the fan oscillation and advection from the surrounding field, while increasing gradually until just before sunrise when the lowest leaf temperature was observed. Thus, the newly developed method based on the heat balance analysis can be expected to contribute to the improvement of frost protection methods.</description><subject>artificial model leaf</subject><subject>eaf heat balance</subject><subject>frost protection</subject><subject>leaf boundary layer conductance</subject><issn>1880-554X</issn><issn>1883-0986</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNo90E1LAzEQBuBFFCzqxV-Qowhbk-ZjswcPtVgVCnpQEDyESTLRyHa3Jluh_97V1p4yZB6GmbcozhkdT-REXqGzYynGbCIPihHTmpe01urwr6allOL1uDjLOVpKhRKyovWoeJu20GxyzKQLZIEQyD1CT26ggdYhmYaArkdP7IY8rjBBH7v2lwKZpy735Cl1_SDiN5I5tCS25BmHXsTG59PiKECT8Wz3nhQv89vn2X25eLx7mE0XpROKy7LmDISyQQVfsaquJHrtrVIavQetNaspB0dBWQtY19ZxFSpNaw_eCi2BnxQX27mr1H2tMfdmGbPDZjgBu3U2TPOKc0ElG-jllrph-5wwmFWKS0gbw6j5DdEMIRopzBDigK-3-DP38I57CqmPrsF_ynd-_-8-IBls-Q90pHpQ</recordid><startdate>2016</startdate><enddate>2016</enddate><creator>KIMURA, Kensuke</creator><creator>MARUO, Kyosuke</creator><creator>OOKI, Takahiro</creator><creator>NAKAZONO, Kentaro</creator><creator>MATSUO, Kiyoshi</creator><creator>KITANO, Masaharu</creator><general>Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7QO</scope><scope>7ST</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>P64</scope><scope>SOI</scope></search><sort><creationdate>2016</creationdate><title>Analysis of Leaf Heat Balance Affected by Operation of a Frost Protective Fan in Tea Fields</title><author>KIMURA, Kensuke ; MARUO, Kyosuke ; OOKI, Takahiro ; NAKAZONO, Kentaro ; MATSUO, Kiyoshi ; KITANO, Masaharu</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c4635-931a46bf6fd717975ed8db668edda8881903ac0a6bbae99bc36f7809dadb485a3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>artificial model leaf</topic><topic>eaf heat balance</topic><topic>frost protection</topic><topic>leaf boundary layer conductance</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>KIMURA, Kensuke</creatorcontrib><creatorcontrib>MARUO, Kyosuke</creatorcontrib><creatorcontrib>OOKI, Takahiro</creatorcontrib><creatorcontrib>NAKAZONO, Kentaro</creatorcontrib><creatorcontrib>MATSUO, Kiyoshi</creatorcontrib><creatorcontrib>KITANO, Masaharu</creatorcontrib><collection>CrossRef</collection><collection>Biotechnology Research Abstracts</collection><collection>Environment Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>Environment Abstracts</collection><jtitle>Environment control in biology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>KIMURA, Kensuke</au><au>MARUO, Kyosuke</au><au>OOKI, Takahiro</au><au>NAKAZONO, Kentaro</au><au>MATSUO, Kiyoshi</au><au>KITANO, Masaharu</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Analysis of Leaf Heat Balance Affected by Operation of a Frost Protective Fan in Tea Fields</atitle><jtitle>Environment control in biology</jtitle><addtitle>Environ. Control Biol.</addtitle><date>2016</date><risdate>2016</risdate><volume>54</volume><issue>3</issue><spage>125</spage><epage>131</epage><pages>125-131</pages><issn>1880-554X</issn><eissn>1883-0986</eissn><notes>ObjectType-Article-1</notes><notes>SourceType-Scholarly Journals-1</notes><notes>ObjectType-Feature-2</notes><notes>content type line 23</notes><abstract>Under climate change, frosts in agricultural fields often bring serious damage to crops. Accordingly, it is keenly desired to improve frost protection methods based on the quantitative evaluation of their effects. The method for quantifying the thermal effect brought by operation of frost protection methods was newly developed based on analysis of leaf heat balance, where leaf boundary layer conductance was continuously determined in field conditions by applying artificial model leaves and a mathematical model. Reliability of the newly developed method was demonstrated in a tea field under the operation of a frost protective fan. The frost protective fan operating at the upper layer of a thermal inversion with strong radiative cooling enhanced convective heat transfer with increased the leaf boundary layer conductance and the ambient air temperature by supplying leaves with warm air. As a result, sensible and latent heat fluxes were significantly increased, which brought a rise of leaf temperature. This thermal effect brought by the fan operation was remarkably fluctuated due to the fan oscillation and advection from the surrounding field, while increasing gradually until just before sunrise when the lowest leaf temperature was observed. Thus, the newly developed method based on the heat balance analysis can be expected to contribute to the improvement of frost protection methods.</abstract><pub>Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists</pub><doi>10.2525/ecb.54.125</doi><tpages>7</tpages><oa>free_for_read</oa></addata></record> |
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source | J-STAGE (Japan Science & Technology Information Aggregator, Electronic) - Open Access English articles |
subjects | artificial model leaf eaf heat balance frost protection leaf boundary layer conductance |
title | Analysis of Leaf Heat Balance Affected by Operation of a Frost Protective Fan in Tea Fields |
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