Universität Bayreuth
Abteilung  Mikrometeorologie
95440 Bayreuth

A R C T E X

The Arctic Turbulence Experiments - Second experiment 2009

 

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Kronebreen-glacier, Kongsfjorden, Svalbard

 

Long-term measurements of near-surface turbulent fluxes in the Arctic environment -  additional laser Scintillometer measurement campaign 2009 at Ny-Ålesund on Svalbard (ARCTEX-2009). DFG research project LU 1400/2-1

 

Head of Project: Dr. Johannes Lüers  and  Dr. Jörg Bareiss

Staff: Martin Wagner (Master Student)

2nd Measurement experiment August 10, 2009 to August 20, 2009 --- Location: Bayelva Catchment south-west of Ny-Ålesund, Spitzbergen (Svalbard), 79 ° North latitude

 

Accurate quantification of turbulent fluxes between the surface and the atmospheric boundary layer in polar environments, characterized by frequent change of weather and exchange conditions (stable to very stable or intermittent; rapid, short term neutral to unstable stratified conditions) is a fundamental problem in soil-snow-ice-vegetation-atmosphere interaction processes. The observed rapid climate warming in the Arctic requires improvements in the permafrost and carbon cycle monitoring. To address these problems, it is essential to improve the databases with high-quality in-situ measurements of turbulent fluxes above tundra landscape surfaces applying the Eddy-Covariance method and the laser scintillometry.
Results from the Arctic Turbulence Experiment 2006 on Svalbard helped to better understand physical exchange processes of energy and matter transport and to improve instrumentation standards as well as quality assessment techniques (Westermann et al. 2009; Lüers and Bareiss 2010, 2011; http://www.arctex.uni-bayreuth.de).
Therefore, the primary goal of this additional laser scintillometer measurement campaign is to estimate the flux contributions covering typical tundra surfaces across the Bayelva catchment during a summer season south-west of the Ny-Ålesund village, Kongsfjord, Svalbard. For this experiment an area of a dry tundra ecosystem and a nearby area of typical wet tundra are selected to run the two laser scintillometer pathways. Both scintillometer sites are close to the long-term Bayelva permafrost observation and eddy-covariance station (weather, soil, energy fluxes) operated by the Alfred Wegener Institute for Polar and Marine Research (AWI) in cooperation with the Dept. of Micrometeorology, Univ. of Bayreuth .
This effort makes it possible to define the spatial context of the heat fluxes, and to include land use features of the surrounding terrain in the quality assessment of all observations in the Bayelva catchment over the last 10 years.
The primary goals of this ARCTEX-campaign were:
1. continuous measurements of the turbulent sensible heat flux near the dry and wet tundra surface using the laser scintillometry,
2. continuous measurements of high-resolution (20 Hz) turbulent heat fluxes near the tundra surface using an ultra sonic anemometer (eddy-covariance method) and an open path CO2/H2O infrared gas analyzer,
3. measurements of standard meteorological data sampled at 1 minute intervals using the AWI meteorological tower (2 m and 10 m) and 30 minute intervals using the instrumentation of the Bayelva Permafrost Station,
4. pre- and post-processing of high-quality data sets of turbulent fluxes using state of the art flux data quality assessment techniques,
5. understanding of exchange processes and their parameterization for neutral, stable and unstable atmospheric stratification and the influence of surface conditions (dry or wet).
 

Transmitter unit of the Laser-Scintillometer (photo: Lüers)