First Observations of Energy Budget and Bulk Fluxes at Ny Ålesund (Svalbard) during a 2010 Transition Period as Analyzed with the BEAR Station

A small-size meteorological mast, BEAR (Budget of Energy for Arctic regions) has been developed as a part of a new autonomous buoy for monitoring the sea ice mass balance. BEAR complements observations of the thickness and thermodynamic properties of the ice/snow pack determined by the so-called Ice-T (Ice-Thickness) buoy, giving access to bulk fluxes and energy budget at the surface, using meteorological measurements. The BEAR mast has been tested with success during ten days in April-May 2010 at Ny Alesund, in the Svalbard archipelago (Norway) showing that meteorological data were close to measurements at the same level of the Italian Climate Change Tower (CCT) from the ISAC-CNR. A discussion is undertaken on bulk fluxes determination and uncertainties. Particularly, the strategy to systematically use different relevant fluxes parameterizations is pointed out to explore flux range uncertainty before to analyze energy budget. Net radiation, bulk fluxes and energy budget are estimated using as average 10 minutes, 24 hours and the ten days of the experiment. The observation period was very short, but we observe a spring transition when the net radiation begins to warm the surface while the very small turbulent heat flux cools the surface.

[1]  Stefan Söderberg,et al.  The performance of a global and mesoscale model over the central Arctic Ocean during late summer , 2009 .

[2]  Gary A. Maykut,et al.  The Surface Heat and Mass Balance , 1986 .

[3]  A. Weill.  Indirect Measurements of Fluxes Using Doppler Sodar , 1991 .

[4]  X. Zeng,et al.  An intercomparison of bulk aerodynamic algorithms used over sea ice with data from the Surface Heat Budget for the Arctic Ocean (SHEBA) experiment , 2006 .

[5]  E. F. Bradley,et al.  Bulk Parameterization of Air–Sea Fluxes: Updates and Verification for the COARE Algorithm , 2003 .

[6]  E. F. Bradley,et al.  Flux-Profile Relationships in the Atmospheric Surface Layer , 1971 .

[7]  T. W. Horst,et al.  Parameterizing turbulent exchange over sea ice in winter , 2010 .

[8]  G. Caniaux,et al.  Turbulent air‐sea fluxes in the Gulf of Guinea during the AMMA experiment , 2009 .

[9]  E. L. Andreas.  Parameterizing Scalar Transfer over Snow and Ice: A Review , 2002 .

[10]  M. Tjernström,et al.  On the potential contribution of open lead particle emissions to the central Arctic aerosol concentration , 2010 .

[11]  H. Charnock.  Wind stress on a water surface , 1955 .

[12]  C. Haas,et al.  Sea-ice thickness variability in Storfjorden, Svalbard , 2011, Annals of Glaciology.

[13]  G. König‐Langlo,et al.  Radiation measurements and synoptic observations at Ny-Ålesund, Svalbard = Strahlungsmessungen und synoptische Beobachtungen in Ny-Ålesund, Spitzbergen , 2006 .

[14]  P. Guest,et al.  Measurements near the Atmospheric Surface Flux Group tower at SHEBA: Near‐surface conditions and surface energy budget , 2002 .

[15]  Edgar L. Andreas,et al.  Parameterizing turbulent exchange over sea ice: the ice station weddell results , 2005 .

[16]  M. Shupe,et al.  A transitioning Arctic surface energy budget: the impacts of solar zenith angle, surface albedo and cloud radiative forcing , 2011 .

[17]  Donald K. Perovich,et al.  Seasonal evolution of the albedo of multiyear Arctic sea ice , 2002 .

[18]  A. G. Price,et al.  Energy balance computations of snowmelt in a subarctic area , 1976 .

[19]  Donald K. Perovich,et al.  Surface freshening in the Arctic Ocean's Eurasian Basin: An apparent consequence of recent change in the wind-driven circulation , 2011 .

[20]  H. Panofsky,et al.  Atmospheric Turbulence: Models and Methods for Engineering Applications , 1984 .

[21]  P. Guest,et al.  Stable Boundary-Layer Scaling Regimes: The Sheba Data , 2005 .

[22]  Pierre Rampal,et al.  IPCC climate models do not capture Arctic sea ice drift acceleration: Consequences in terms of projected sea ice thinning and decline , 2011 .

[23]  J. Lüers,et al.  The effect of misleading surface temperature estimations on the sensible heat fluxes at a high Arctic site – the Arctic Turbulence Experiment 2006 on Svalbard (ARCTEX-2006) , 2009 .

[24]  Roger G. Barry,et al.  The Arctic sea ice-climate system: observations and modeling , 1993 .

[25]  Albert A. M. Holtslag,et al.  Flux Parameterization over Land Surfaces for Atmospheric Models , 1991 .

[26]  Edgar L. Andreas,et al.  Parametrizing turbulent exchange over summer sea ice and the marginal ice zone , 2010 .

[27]  R. J. Batterham,et al.  Surface temperature measurement , 1971 .

[28]  R. J. Ronda,et al.  Approximate Solutions For The Obukhov Length And The Surface Fluxes In Terms Of Bulk Richardson Numbers , 2000 .

[29]  Christopher W. Fairall,et al.  Dependence of the Monin–Obukhov Stability Parameter on the Bulk Richardson Number over the Ocean , 1997 .

[30]  L. Eymard,et al.  BEAR, une station de mesure pour l'océan Arctique , 2011 .

[31]  Problems in the determination of sensible heat flux over snow , 2002 .

[32]  Edgar L. Andreas,et al.  SHEBA flux–profile relationships in the stable atmospheric boundary layer , 2007 .