Upscaling surface energy fluxes over the North Slope of Alaska using airborne eddy-covariance measurements and environmental response functions
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Published:2018-07-13
Issue:13
Volume:18
Page:10007-10023
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Serafimovich AndreiORCID, Metzger StefanORCID, Hartmann JörgORCID, Kohnert Katrin, Zona DonatellaORCID, Sachs TorstenORCID
Abstract
Abstract. The objective of this study was to upscale airborne flux measurements of
sensible heat and latent heat and to develop high-resolution flux maps. In
order to support the evaluation of coupled atmospheric–land-surface models we
investigated spatial patterns of energy fluxes in relation to land-surface
properties. We used airborne eddy-covariance measurements acquired by the Polar 5
research aircraft in June–July 2012 to analyze surface fluxes.
Footprint-weighted surface properties were then related to 21 529 sensible
heat flux observations and 25 608 latent heat flux observations using both
remote sensing and modeled data. A boosted regression tree technique was
used to estimate environmental response functions between spatially and
temporally resolved flux observations and corresponding biophysical and
meteorological drivers. In order to improve the spatial coverage and spatial
representativeness of energy fluxes we used relationships extracted across
heterogeneous Arctic landscapes to infer high-resolution surface energy flux
maps, thus directly upscaling the observational data. These maps of projected
sensible heat and latent heat fluxes were used to assess energy partitioning
in northern ecosystems and to determine the dominant energy exchange
processes in permafrost areas. This allowed us to estimate energy fluxes for
specific types of land cover, taking into account meteorological conditions.
Airborne and modeled fluxes were then compared with measurements from an
eddy-covariance tower near Atqasuk. Our results are an important contribution for the advanced, scale-dependent
quantification of surface energy fluxes and they provide new insights into the
processes affecting these fluxes for the main vegetation types in
high-latitude permafrost areas.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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