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  • 16th International Symposium for the Advancement of Boundary-Layer Remote Sensing (ISARS 2012) x
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A. B. White, M. L. Anderson, M. D. Dettinger, F. M. Ralph, A. Hinojosa, D. R. Cayan, R. K. Hartman, D. W. Reynolds, L. E. Johnson, T. L. Schneider, R. Cifelli, Z. Toth, S. I. Gutman, C. W. King, F. Gehrke, P. E. Johnston, C. Walls, D. Mann, D. J. Gottas, and T. Coleman

antennas are enclosed in shrouds that have steep covered openings so that snow can slide off and not impact operation of the radar. These antennas have asymmetrical side lobes that allow the radars to be situated at sites that otherwise would produce ground clutter for other types of vertically pointing radars. The electronics for the snow-level radar are located in the narrow compartment between the antennas. The compartment is insulated and has a heater and air conditioner. This allows the radar to

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C. R. Wood, R. D. Kouznetsov, R. Gierens, A. Nordbo, L. Järvi, M. A. Kallistratova, and J. Kukkonen

fall ( Fig. 3a ). Most of the largest (from around 10 −3 to 10 −1 K 2 m −2/3 ) occurred during daytime unstable conditions. But also, there were a few high values during November, January, and February nights, consistent with the large occurrence of negative sensible heat fluxes over Helsinki. Indeed, the sonic-derived sensible heat fluxes were negative for 45% of the time in those particular studied months, partly driven by the long nights and snow cover ( Wood et al. 2013a ). The lowest

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