Beitrag
Surface energy fluxes during the total solar eclipse over Ny-Ålesund, Svalbard, on 20 March 2015
Schulz, Alexander; Schaller, Carsten; Maturilli, Marion; Boike, Julia; Ritter, Christoph; Foken, Thomas
Meteorologische Zeitschrift Vol. 26 No. 4 (2017), p. 431 - 440
41 Literaturangaben
veröffentlicht: Oct 26, 2017
Online veröffentlicht: Jul 21, 2017
Manuskript akzeptiert: Mar 14, 2017
finale Ms. Revision erhalten: Mar 13, 2017
Manuskript-Revision angefordert: Feb 22, 2017
Manuskript erhalten: Dec 12, 2016
Open Access (Arbeit kann kostenlos heruntergeladen werden)
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.
Schlagworte
total solar eclipse • sensible heat flux • radiation • eclipse cyclone • Ny-Ålesund