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DOI10.5194/amt-10-3963-2017
Assessment of mixed-layer height estimation from single-wavelength ceilometer profiles
Knepp, Travis N.1,2; Szykman, James J.2,3; Long, Russell3; Duvall, Rachelle M.3; Krug, Jonathan3; Beaver, Melinda3; Cavender, Kevin3; Kronmiller, Keith4; Wheeler, Michael4; Delgado, Ruben5; Hoff, Raymond5; Berkoff, Timothy2; Olson, Erik6; Clark, Richard7; Wolfe, Daniel8; Van Gilst, David9; Neil, Doreen2
发表日期2017-10-25
ISSN1867-1381
卷号10期号:10页码:3963-3983
英文摘要

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 (DISCOVERAQ) 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 boundarylayer 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 lidarderived 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.


语种英语
WOS记录号WOS:000413669900003
来源期刊ATMOSPHERIC MEASUREMENT TECHNIQUES
来源机构美国环保署
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/61746
作者单位1.Sci Syst & Applications Inc, Hampton, VA 23666 USA;
2.NASA, Langley Res Ctr, Hampton, VA 23681 USA;
3.US EPA, Durham, NC 27709 USA;
4.Jacobs Technol Inc, Tullahoma, TN 37388 USA;
5.Univ Maryland Baltimore Cty, Joint Ctr Earth Syst Technol, Baltimore, MD 21250 USA;
6.Univ Wisconsin Madison, Space Sci & Engn Ctr, Madison, WI 53706 USA;
7.Millersville Univ Pennsylvania, Dept Earth Sci, Millersville, PA 17551 USA;
8.NOAA, ESRL, Phys Sci Div, Boulder, CO 80305 USA;
9.Univ North Dakota, Natl Suborbital Educ & Res Ctr, Grand Forks, ND 58202 USA
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GB/T 7714
Knepp, Travis N.,Szykman, James J.,Long, Russell,et al. Assessment of mixed-layer height estimation from single-wavelength ceilometer profiles[J]. 美国环保署,2017,10(10):3963-3983.
APA Knepp, Travis N..,Szykman, James J..,Long, Russell.,Duvall, Rachelle M..,Krug, Jonathan.,...&Neil, Doreen.(2017).Assessment of mixed-layer height estimation from single-wavelength ceilometer profiles.ATMOSPHERIC MEASUREMENT TECHNIQUES,10(10),3963-3983.
MLA Knepp, Travis N.,et al."Assessment of mixed-layer height estimation from single-wavelength ceilometer profiles".ATMOSPHERIC MEASUREMENT TECHNIQUES 10.10(2017):3963-3983.
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