Turbulent flux and meteorological measurements during ARCTEX-2006 campaign


Autoria(s): Lüers, Johannes; Bareiss, Jörg
Cobertura

LATITUDE: 78.921500 * LONGITUDE: 11.929000 * DATE/TIME START: 2006-05-04T23:55:00 * DATE/TIME END: 2006-05-19T10:20:00

Data(s)

02/05/2013

Resumo

This dataset present result from the DFG- funded Arctic-Turbulence-Experiment (ARCTEX-2006) performed by the University of Bayreuth on the island of Svalbard, Norway, during the winter/spring transition 2006. From May 5 to May 19, 2006 turbulent flux and meteorological measurements were performed on the monitoring field near Ny-Ålesund, at 78°55'24'' N, 11°55'15'' E Kongsfjord, Svalbard (Spitsbergen), Norway. The ARCTEX-2006 campaign site was located about 200 m southeast of the settlement on flat snow covered tundra, 11 m to 14 m above sea level. The permanent sites used for this study consisted of the 10 m meteorological tower of the Alfred Wegener Institute for Polar- and Marine Research (AWI), the international standardized radiation measurement site of the Baseline Surface Radiation Network (BSRN), the radiosonde launch site and the AWI tethered balloon launch sites. The temporary sites - set up by the University of Bayreuth - were a 6 m meteorological gradient tower, an eddy-flux measurement complex (EF), and a laser-scintillometer section (SLS). A quality assessment and data correction was applied to detect and eliminate specific measurement errors common at a high arctic landscape. In addition, the quality checked sensible heat flux measurements are compared with bulk aerodynamic formulas that are widely used in atmosphere-ocean/land-ice models for polar regions as described in Ebert and Curry (1993, doi:10.1029/93JC00656) and Launiainen and Cheng (1995). These parameterization approaches easily allow estimation of the turbulent surface fluxes from routine meteorological measurements. The data show: - the role of the intermittency of the turbulent atmospheric fluctuation of momentum and scalars, - the existence of a disturbed vertical temperature profile (sharp inversion layer) close to the surface, - the relevance of possible free convection events for the snow or ice melt in the Arctic spring at Svalbard, and - the relevance of meso-scale atmospheric circulation pattern and air-mass advection for the near-surface turbulent heat exchange in the Arctic spring at Svalbard. Recommendations and improvements regarding the interpretation of eddy-flux and laser-scintillometer data as well as the arrangement of the instrumentation under polar distinct exchange conditions and (extreme) weather situations could be derived.

Formato

application/zip, 5 datasets

Identificador

https://doi.pangaea.de/10.1594/PANGAEA.811066

doi:10.1594/PANGAEA.811066

Idioma(s)

en

Publicador

PANGAEA

Relação

Lüers, Johannes; Bareiss, Jörg (2011): Direct near-surface measurements of sensible heat fluxes in the Arctic tundra applying eddy covariance and laser scintillometry-the Arctic Turbulence Experiment 2006 on Svalbard (ARCTEX-2006). Theoretical and Applied Climatology, 105(3-4), 387-402, doi:10.1007/s00704-011-0400-5

Lüers, Johannes; Bareiss, Jörg (2010): 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). Atmospheric Chemistry and Physics, 10(1), 157-168, doi:10.5194/acp-10-157-2010

Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted

Palavras-Chave #AH; Albedo; Buoyancy flux; Calculated; calculated using Monin-Obukhov similarity for stable density stratification; calculated using Monin-Obukhov similarity for unstable density stratification; CBH; Cloud base height; Cloud top height; Cn**2; Structure function constant of refractive index fluctuations in 10**-12 * m**(-2/3); combined Quality class 1 (good) to 9 (bad) for friction velocity; combined Quality class 1 (good) to 9 (bad) for sensible heat flux; Const; Constant; corrected, stable; corrected, unstable; corrected sensible heat flux measurements with laser-scintillometer with decision of flux direction: EF <> 0; corrected sensible heat flux measurements with ultrasonic-anemometer using Eddy-covariance-method; Correlation; Counter; Cov; Covariance; Ct**2; Structure function constant of temperature fluctuations in K * m**(-2/3); CTH; Date/Time; DATE/TIME; dd; decision of flux direction: if sensible heat flux is negative (index = -1) or positive (index = 10); derived from hydrodynamic three-layer temperature-profile model (3LM); derived from infrared long-wave upward radiation; DIF; Diffuse radiation; Diss; ff; ff grad; Flag; Flux, turbulent; Flux turb; for BSRN site NYA; for BT site ARCTEX; Friction velocity; from u and v; Heat Flux, latent, modeled; Heat Flux, sensible; Heat Flux, sensible, modeled; Height; HEIGHT above ground; Height above sea floor/altitude; Height of laser beam above ground; Humidity, absolute; Humidity, relative; I0; Index; Inner scale of refractive index fluctuations; Integral turbulence characteristics for sonic temperature; Integral turbulence characteristics for wind velocity, east-west; Integral turbulence characteristics for wind velocity, vertical; Lake, length; Lake l; Laser-scintillometer SLS20; latent heat flux above snow-cover using 3LM-derived T(0) after Launiainen and Cheng (1995); latent heat flux above snow-cover using IR-derived T(0) after Launiainen and Cheng (1995); Long-wave downward radiation; Long-wave upward radiation; LWD; LWU; mean of temperature measured at 0.7 m amd 2.4 m above ground; measured at AWI site NYA; measured at BSRN site NYA; measurements at 2 and 10 m at AWI site NYA, BT for other heights above ground; modelled; Momentum Flux, turbulent; Mom Flux turb; Monin-Obukhov-length; MOS; No; NOBS; Number; Number of observations; number of valid values, 10 Hz, max 36000; of error free diagnosis data periods within the main data period; of the logarithm of the amplitude in channel 1 calculated from the measured intensity data; of the logarithm of the amplitude in channel 2 calculated from the measured intensity data; of the logarithms of the amplitude in channels 1 and 2; of u and Ts; of u and v; of u and w; of v and Ts; of v and w; of w and Ts = buoyancy flux; overall flag (1 = OK, 0 = error); Path length, distance between laser transmitter and laser receiver; Perc; Percentage; PPPP; Pressure, atmospheric; Qe mod; Qh; Qh mod; Quality flag; Rate of kinetic energy dissipation; RH; Ri; Richardson number; sensible heat flux above snow-cover using 3LM-derived T(0) after Ebert and Curry (1993, doi:10.1029/93JC00656); sensible heat flux above snow-cover using 3LM-derived T(0) after Launiainen and Cheng (1995); sensible heat flux above snow-cover using IR-derived T(0) after Ebert and Curry (1993, doi:10.1029/93JC00656); sensible heat flux above snow-cover using IR-derived T(0) after Launiainen and Cheng (1995); Short-wave downward (GLOBAL) radiation; Short-wave upward (REFLEX) radiation; Sonic temperature; Sonic temperature, variance; Stability; stability parameter z = measured height (2.4m above ground), L = Monin-Obukhov length in m (ultrasonic-anemometer); Standard deviation; Std dev; Steady state Test: Quality class 1 (good) to 9 (bad); Steady state Test: Quality class 1 (good) to 9 (bad) for friction velocity; SWD; SWU; T air calc; Temperature, air; Temperature, air, calculated; Temperature, air, gradient; Temperature gradient between 10 m and 0 m above ground derived from hydrodynamic three-layer temperature-profile model (3LM); Temperature gradient between 10 m and 0 m above ground derived from infrared long-wave upward radiation; Ts; Ts var; TTT; TTT grad; turbulent flux of momentum calculated using Monin-Obukhov similarity for stable density stratification; turbulent flux of momentum calculated using Monin-Obukhov similarity for unstable density stratification; turbulent flux of sensible heat; turbulent flux of sensible heat (laser-scintillometer) with decision of flux direction: air temperature gradient 10 m-0.0m 3LM; turbulent flux of sensible heat (laser-scintillometer) with decision of flux direction: air temperature gradient 10 m-0.0m IR; turbulent flux of sensible heat (laser-scintillometer) with decision of flux direction: EF <> 0; turbulent flux of sensible heat calculated using ultrasonic-anemometer and eddy-covariance 5min integration time; U; u*; Ultrasonic-anemometer using Eddy-covariance-method; U var; V; V var; W; Wind direction; Wind speed; Wind speed, gradient; Wind speed gradient between 10 m and 0.7 m above ground; Wind velocity, south-north; Wind velocity, south-north, variance; Wind velocity, vertical; Wind velocity, vertical, variance; Wind velocity, west-east; Wind velocity, west-east, variance; with T(0) derived from hydrodynamic three-layer temperature-profile model (3LM); with T(0) derived from infrared long-wave upward radiation; with the bulk parameters after Louis (1979, doi:10.1007/BF00117978) and Ebert & Curry (1993, doi:10.1029/93JC00656); W var
Tipo

Dataset