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Schulz, Alexander ; Schaller, Carsten ; Maturilli, Marion ; Boike, Julia ; Ritter, Christoph ; Foken, Thomas:
Surface Energy Fluxes During the Total Solar Eclipse over Ny-Ålesund, Svalbard, on 20 March 2015.
In: Meteorologische Zeitschrift.
Bd. 26
(2017)
Heft 4
.
- S. 431-440.
ISSN 1610-1227
DOI: https://doi.org/10.1127/metz/2017/0846
Abstract
On 20 March 2015, a total solar eclipse occurred over Ny-Ålesund (78.9° N, 11.9° E), Svalbard, under ideal conditions with clear sky. The cycle of the radiation fluxes is comparable with other experiments during eclipses, with even the upward longwave radiation showing significant changes, with a delay to the shortwave radiation and a slowly linear increase after the totality. Also, under polar conditions, an increase of the wind velocity before and a decrease after the totality was found, which is an indicator of the generation of an “Eclipse cyclone”. This change of the wind direction generated a local wind system with a near-surface-layer katabatic flow. During the eclipse, a remarkably large sensible heat flux was observed. The turbulent fluxes were analysed using a wavelet technique with 1-minute time resolution, which is the ideal method for investigating these highly non-steady conditions. No influences on the boundary layer structure as measured with radiosondes were found, with the exception of a wind direction change during the eclipse cyclone below the shallow inversion layer.