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  Coupling of submeso-scale motion with near-surface turbulence over patchy snow cover

Haugeneder, M., Lehning, M., Stiperski, I., Reynolds, D., Mott, R. (2023): Coupling of submeso-scale motion with near-surface turbulence over patchy snow cover, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-0927

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 Urheber:
Haugeneder, Michael1, Autor
Lehning, Michael1, Autor
Stiperski, Ivana1, Autor
Reynolds, Dylan1, Autor
Mott, Rebecca1, Autor
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Zusammenfassung: In spring, when the mountainous snow cover becomes patchy, the strong multi-scale surface heterogeneity influences atmospheric heat exchange processes. At valley scale, thermally driven winds advect warm air towards snow-covered regions at higher elevations. Additionally, the difference in albedo between bare ground and adjacent snow patches causes strong surface temperature differences on a (sub-)meter scale. Consequently, the structure of the near-surface boundary layer is spatio-temporally highly variable. During spring 2021, we recorded data in a comprehensive field campaign in the Dischma valley close to Davos (CH). The dataset includes multiple eddy-covariance measurements at different measurement heights. The topographic setting allows to group the measurements into up valley and down valley flow systems. Using a multi-resolution spectral decomposition of turbulent flux variables, we investigate the structure and dynamics of near-surface turbulence. During up valley flows, the advection of warm air induces stable internal boundary layers (SIBL) adjacent to snow patches with near-neutral static stability above. The strong stability withing the SIBL eventually leads to decoupling of the near-surface turbulence from the submeso-scale motions aloft. In contrast, during down valley flows, stability dampens turbulence similarly at all measurement heights. In concert with those findings, measurements utilizing the IR-screen setup during the same campaign yield high spatio-temporally resolved air temperature profiles during phases of different stability. Furthermore, the screen measurements visualize the near-surface boundary layer dynamics. In the next step, we will use the gained process understanding to test new physical parameterizations especially for warm air advection in hectometer scale coupled snow-atmosphere models.

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Sprache(n): eng - Englisch
 Datum: 2023
 Publikationsstatus: Final veröffentlicht
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 Identifikatoren: DOI: 10.57757/IUGG23-0927
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Titel: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Veranstaltungsort: Berlin
Start-/Enddatum: 2023-07-11 - 2023-07-20

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Titel: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Genre der Quelle: Konferenzband
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Ort, Verlag, Ausgabe: Potsdam : GFZ German Research Centre for Geosciences
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