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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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Atmos. Meas. Tech., 10, 3963-3983, 2017
https://doi.org/10.5194/amt-10-3963-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
25 Oct 2017
Assessment of mixed-layer height estimation from single-wavelength ceilometer profiles
Travis N. Knepp1,2, James J. Szykman3,4, Russell Long3, Rachelle M. Duvall3, Jonathan Krug3, Melinda Beaver3, Kevin Cavender3, Keith Kronmiller5, Michael Wheeler5, Ruben Delgado6, Raymond Hoff6, Timothy Berkoff2, Erik Olson7, Richard Clark8, Daniel Wolfe9, David Van Gilst10, and Doreen Neil2 1Science Systems and Applications Inc., Hampton, Virginia 23666, USA
2NASA Langley Research Center, Hampton, Virginia 23681, USA
3US EPA, Research Triangle Park, Durham, North Carolina 27709, USA
4Currently assigned to NASA Langley Research Center, Hampton, Virginia 23681, USA
5Jacobs Technology Inc., Tullahoma, Tennessee 37388, USA
6Joint Center for Earth Systems Technology, University of Maryland Baltimore County, Baltimore, Maryland 21250, USA
7Space Science and Engineering Center, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
8Department of Earth Sciences, Millersville University, Millersville, Pennsylvania 17551, USA
9NOAA/ESRL Physical Sciences Division, Boulder, Colorado 80305, USA
10National Suborbital Education and Research Center, University of North Dakota, Grand Forks, North Dakota 58202, USA
Abstract. Differing boundary/mixed-layer height measurement methods were assessed in moderately polluted and clean environments, with a focus on the Vaisala CL51 ceilometer. This intercomparison was performed as part of ongoing measurements at the Chemistry And Physics of the Atmospheric Boundary Layer Experiment (CAPABLE) site in Hampton, Virginia and during the 2014 Deriving Information on Surface Conditions from Column and Vertically Resolved Observations Relevant to Air Quality (DISCOVER-AQ) field campaign that took place in and around Denver, Colorado. We analyzed CL51 data that were collected via two different methods (BLView software, which applied correction factors, and simple terminal emulation logging) to determine the impact of data collection methodology. Further, we evaluated the STRucture of the ATmosphere (STRAT) algorithm as an open-source alternative to BLView (note that the current work presents an evaluation of the BLView and STRAT algorithms and does not intend to act as a validation of either). Filtering criteria were defined according to the change in mixed-layer height (MLH) distributions for each instrument and algorithm and were applied throughout the analysis to remove high-frequency fluctuations from the MLH retrievals. Of primary interest was determining how the different data-collection methodologies and algorithms compare to each other and to radiosonde-derived boundary-layer heights when deployed as part of a larger instrument network. We determined that data-collection methodology is not as important as the processing algorithm and that much of the algorithm differences might be driven by impacts of local meteorology and precipitation events that pose algorithm difficulties. The results of this study show that a common processing algorithm is necessary for light detection and ranging (lidar)-based MLH intercomparisons and ceilometer-network operation, and that sonde-derived boundary layer heights are higher (10–15 % at midday) than lidar-derived mixed-layer heights. We show that averaging the retrieved MLH to 1 h resolution (an appropriate timescale for a priori data model initialization) significantly improved the correlation between differing instruments and differing algorithms.

Citation: Knepp, T. N., Szykman, J. J., Long, R., Duvall, R. M., Krug, J., Beaver, M., Cavender, K., Kronmiller, K., Wheeler, M., Delgado, R., Hoff, R., Berkoff, T., Olson, E., Clark, R., Wolfe, D., Van Gilst, D., and Neil, D.: Assessment of mixed-layer height estimation from single-wavelength ceilometer profiles, Atmos. Meas. Tech., 10, 3963-3983, https://doi.org/10.5194/amt-10-3963-2017, 2017.
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Herein we compare the mixed-layer data products from differing ceilometer instruments and meteorological sondes.
Herein we compare the mixed-layer data products from differing ceilometer instruments and...
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