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  Forest snow processes in three dimensions: Linking a shortwave radiation transfer model and springtime canopy surface temperature patterns

Webster, C., Haagmans, V., Girod, L., Lumbrazo, C., Mazzotti, G., Jonas, T. (2023): Forest snow processes in three dimensions: Linking a shortwave radiation transfer model and springtime canopy surface temperature patterns, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4372

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021803 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021803_1
Genre: Conference Paper

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 Creators:
Webster, Clare1, Author
Haagmans, Vincent1, Author
Girod, Luc1, Author
Lumbrazo, Cassie1, Author
Mazzotti, Giulia1, Author
Jonas, Tobias1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: Forest snow dynamics are strongly controlled by three-dimensional canopy structure, particularly due to the way the forest interacts with the changing solar position. Exposure of the canopy to solar radiation increases canopy temperatures, enhancing longwave radiation at the snow surface. However, solar radiation is mostly absorbed in the upper canopy while it is the lower canopy that emits the bulk of longwave radiation to the snow surface. The three-dimensional nature of canopy radiative transfer processes have typically been under-investigated due to the difficulty in obtaining both solar radiation measurements within the canopy vertical profile and spatially explicit maps of canopy temperatures. To advance our understanding of and ability to predict 3D canopy energy balance processes, we present a 3D radiation transfer model that is capable of accurately predicting solar energy input at the canopy surface in structurally complex forest environments. As a first use case, we link predicted incoming solar radiation at the canopy surface to horizontal and vertical canopy temperature distributions estimated from both UAV-borne and ground-based thermal infrared imagery. Multiple thermal orthomosaics from repeat acquisitions throughout a daily solar cycle show linkages between solar radiation and changing canopy temperature distributions. .The results show that 3D estimates of solar radiation in forests will be an important tool in multi-layer canopy energy balance modelling. Furthermore, we anticipate these types of models will contribute to improving our understanding and prediction of other forest snow processes, for example, unloading of snow intercepted in the canopy.

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Language(s): eng - English
 Dates: 2023-07-112023-07-11
 Publication Status: Finally published
 Pages: -
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-4372
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
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