Long wave radiation regime in vegetation-parameterisations for climate research
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| Title: | Long wave radiation regime in vegetation-parameterisations for climate research |
|---|---|
| Authors: | Rotenberg, E., Mamane, Y., Joseph, J. H. |
| Source: | Environmental Modelling & Software. 1998, Vol. 13 Issue 3/4, p361. 0p. |
| Subjects: | Modeling (Sculpture) |
| Abstract: | An analytical and mathematical model that describes the long wave radiation regime inside a vegetation canopy was developed. The model assumptions are: leaves are the only vegetation elements and are arranged in horizontally infinite layers: they are evenly spread in the layers; having random azimuthal direction and defined zenithal direction. Leaves absorb all thermal radiation, do not scatter any and emit isotropic radiation. An adaptation of the 'View factor' concept describes radiation exchanges between leaves and leaf layers. The model calculated the amount of irradiance incident on a single tilted leaf froma flat surface (like the ground). it was found that for an isothermal and infinite emitting surface, with both sides of the leaf absorbing identically, the leaf's tilt angle does not influence the amount ofirradiance impinging on it. Then the amount of radiation exchanged by two leaves in nearby layers and the irradiance reaching the leaf from a nearby leaf layer are evaluated. Next, the 'layer attenuation coefficient', and the 'emission coefficient of a leaf layer' are calculated. Finally, the plane parallel radiation transfer equation of thermal fluxes radiance in vegetation canopy is presented. It was concluded that for an infinite, homogeneous and isothermal leaf canopy with erect leaves, outside irradiance penetrates into deeper layers and less thermal radiation is released to the surroundings, than for the plane leaf canopy case. From this point of view an erect leaf canopy isbetter suited to cold climates. (c) 1998 Elsevier Science Ltd. [ABSTRACT FROM AUTHOR] |
| Copyright of Environmental Modelling & Software is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 8286199 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Long wave radiation regime in vegetation-parameterisations for climate research – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Rotenberg%2C+E%2E%22">Rotenberg, E.</searchLink><br /><searchLink fieldCode="AR" term="%22Mamane%2C+Y%2E%22">Mamane, Y.</searchLink><br /><searchLink fieldCode="AR" term="%22Joseph%2C+J%2E+H%2E%22">Joseph, J. H.</searchLink> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Environmental+Modelling+%26+Software%22">Environmental Modelling & Software</searchLink>. 1998, Vol. 13 Issue 3/4, p361. 0p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Modeling+%28Sculpture%29%22">Modeling (Sculpture)</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: An analytical and mathematical model that describes the long wave radiation regime inside a vegetation canopy was developed. The model assumptions are: leaves are the only vegetation elements and are arranged in horizontally infinite layers: they are evenly spread in the layers; having random azimuthal direction and defined zenithal direction. Leaves absorb all thermal radiation, do not scatter any and emit isotropic radiation. An adaptation of the 'View factor' concept describes radiation exchanges between leaves and leaf layers. The model calculated the amount of irradiance incident on a single tilted leaf froma flat surface (like the ground). it was found that for an isothermal and infinite emitting surface, with both sides of the leaf absorbing identically, the leaf's tilt angle does not influence the amount ofirradiance impinging on it. Then the amount of radiation exchanged by two leaves in nearby layers and the irradiance reaching the leaf from a nearby leaf layer are evaluated. Next, the 'layer attenuation coefficient', and the 'emission coefficient of a leaf layer' are calculated. Finally, the plane parallel radiation transfer equation of thermal fluxes radiance in vegetation canopy is presented. It was concluded that for an infinite, homogeneous and isothermal leaf canopy with erect leaves, outside irradiance penetrates into deeper layers and less thermal radiation is released to the surroundings, than for the plane leaf canopy case. From this point of view an erect leaf canopy isbetter suited to cold climates. (c) 1998 Elsevier Science Ltd. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Environmental Modelling & Software is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/S1364-8152(98)00041-3 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 0 StartPage: 361 Subjects: – SubjectFull: Modeling (Sculpture) Type: general Titles: – TitleFull: Long wave radiation regime in vegetation-parameterisations for climate research Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Rotenberg, E. – PersonEntity: Name: NameFull: Mamane, Y. – PersonEntity: Name: NameFull: Joseph, J. H. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 03 Text: 1998 Type: published Y: 1998 Identifiers: – Type: issn-print Value: 13648152 Numbering: – Type: volume Value: 13 – Type: issue Value: 3/4 Titles: – TitleFull: Environmental Modelling & Software Type: main |
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