Spatial Scale Gaps of Turbulent Heat Fluxes in Arctic Tundra
Abstract
Large-area averaged turbulent fluxes of scalars (heat and carbon) play an important role in climate and ecosystem models by resolving the scale-gap closure defining top-down and bottom-up scaling schemes. Large Aperture Scintillometer (LAS) measurement of the refractive index structure function (CN2) allows for indirect retrieval of area-averaged (>km2) atmospheric boundary layer sensible heat fluxes. In this work we report observations of LAS in Arctic tundra at Imnavait Creek Basin. LAS-derived fluxes are compared to more localized measurements of heat fluxes obtained by an eddy-covariance (EC) system distributed across the basin. This article discusses the divergence observed in the temporal series of LAS-fluxes in comparison to spatially distributed measurements of EC-fluxes. The comparison stresses the role of the Arctic ABL structure, terrain-flow characteristics and radiative fluxes in the overall spatial representation of fluxes.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2013
- Bibcode:
- 2013AGUFM.A43A0229F
- Keywords:
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- 3307 ATMOSPHERIC PROCESSES Boundary layer processes;
- 1843 HYDROLOGY Land/atmosphere interactions;
- 1814 HYDROLOGY Energy budgets