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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/amt-2018-173
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2018-173
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 14 Jun 2018

Submitted as: research article | 14 Jun 2018

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This preprint was under review for the journal AMT but the revision was not accepted.

In-situ sounding of radiation flux profiles through the Arctic lower troposphere

Ralf Becker1, Marion Maturilli2, Rolf Philipona3, and Klaus Behrens1 Ralf Becker et al.
  • 1Deutscher Wetterdienst, Meteorologisches Observatorium Lindenberg/Mark, Am Observatorium 12, 15848 Tauche, Germany
  • 2Alfred-Wegener-Institut, Helmholtz-Zentrum fuer Polar- und Meeresforschung Telegrafenberg A45, 14473 Potsdam, Germany
  • 3MeteoSuisse, Chemin de l'Aerologie, 1530 Payerne, Switzerland

Abstract. In-situ profiles of all four net radiation components were obtained at Ny Ålesund/Svalbard (78.9° N, 11.9° E) in the time frame May 04–21, 2015. Measurements could be performed using adapted high quality instrumentation classified as secondary standard carried by a tethered balloon system. Balloon lifted measurements of albedo under clear sky conditions demonstrate the altitude dependence of this parameter over heterogeneous terrain. Depending on the surface composition within the sensor's footprint, the albedo over predominantly snow covered surfaces was found to decrease to 53.4 % and 35.8 % compared to 73.1 % and 78.8 % measured with near surface references, respectively. Albedo profiles show an all-sky maximum at 150 m above surface level, and an averaged vertical change rate of −2.1 %/100 m (clear sky) and −3.4 %/100 m (overcast) above. Profiling of arctic low-level clouds reveals distinct vertical gradients in all radiation fluxes but longwave upward. Observed radiative cooling at cloud top with heating rates of −53 to −84 K/d in subsequent observations tend to be lower than suggested by 1-D simulations.

Ralf Becker et al.

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Ralf Becker et al.

Ralf Becker et al.

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