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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 8, issue 9
Atmos. Meas. Tech., 8, 3789–3809, 2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Meas. Tech., 8, 3789–3809, 2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 18 Sep 2015

Research article | 18 Sep 2015

Synchronous polar winter starphotometry and lidar measurements at a High Arctic station

K. Baibakov1,2, N. T. O'Neill1, L. Ivanescu1, T. J. Duck3, C. Perro3, A. Herber4, K.-H. Schulz5, and O. Schrems2,4 K. Baibakov et al.
  • 1Centre d'Applications et de Recherches en Télédétection, Université de Sherbrooke, Sherbrooke, Canada
  • 2Dept. of Chemistry, University of Bremen, Bremen, Germany
  • 3Dept. of Physics and Atmospheric Science, Dalhousie University, Halifax, Canada
  • 4Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany
  • 5Dr. Schulz & Partner GmbH, Buckow, Germany

Abstract. We present recent progress on nighttime retrievals of aerosol and cloud optical properties over the PEARL (Polar Environmental Atmospheric Research Laboratory) station at Eureka (Nunavut, Canada) in the High Arctic (80° N, 86° W). In the spring of 2011 and 2012, a star photometer was employed to acquire aerosol optical depth (AOD) data, while vertical aerosol and cloud backscatter profiles were measured using the CANDAC Raman Lidar (CRL). We used a simple backscatter coefficient threshold (βthr) to distinguish aerosols from clouds and, assuming that aerosols were largely fine mode (FM)/sub-micron, to distinguish FM aerosols from coarse mode (CM)/super-micron cloud or crystal particles. Using prescribed lidar ratios, we computed FM and CM AODs that were compared with analogous AODs estimated from spectral star photometry. We found (βthr dependent) coherences between the lidar and star photometer for both FM events and CM cloud and crystal events with averaged, FM absolute differences being <∼0.03 when associated R2 values were between 0.2 and 0.8. A βthr sensitivity study demonstrated that zero crossing absolute differences and R2 peaks were in comparable regions of the βthr range (or physical reasons were given for their disparity). The utility of spectral vs. temporal cloud screening of star photometer AODs was also illustrated. In general our results are critical to building confidence in the physical fidelity of derived, weak amplitude, star photometry AODs and, in turn, towards the development of AOD climatologies and validation databases for polar winter models and satellite sensors.

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