Retrieval of mixing height and dust concentration with lidar ceilometer

Münkel, Christoph; Eresmaa, Noora; Räsänen, Janne; Karppinen, Ari

doi:10.1007/s10546-006-9103-3

Cited by 246 publications

(220 citation statements)

References 6 publications

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“…This design reduces the optical crosstalk between transmitter and receiver and in turn increases the signal-to-noise ratio. A beam splitter gives full overlap of the transmitter and receiver field of view at an altitude of 70 m (Münkel et al, 2007).…”

Section: Vaisala Cl31mentioning

confidence: 99%

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Comparison of aerosol lidar retrieval methods for boundary layer height detection using ceilometer aerosol backscatter data

Caicedo

Rappenglück

Lefer³

et al. 2017

Atmos. Meas. Tech.

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Abstract. Three algorithms for estimating the boundary layer heights are assessed: an aerosol gradient method, a cluster analysis method, and a Haar wavelet method. Over 40 daytime clear-sky radiosonde profiles are used to compare aerosol backscatter boundary layer heights retrieved by a Vaisala CL31 ceilometer. Overall good agreement between radiosonde-and aerosol-derived boundary layer heights was found for all methods. The cluster method was found to be particularly sensitive to noise in ceilometer signals and lofted aerosol layers (48.8 % of comparisons), while the gradient method showed limitations in low-aerosol-backscatter conditions. The Haar wavelet method was demonstrated to be the most robust, only showing limitations in 22.5 % of all observations. Occasional differences between thermodynamically and aerosol-derived boundary layer heights were observed.

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Section: Vaisala Cl31mentioning

confidence: 99%

“…The CL31 ran with firmware v1.7 and noise_h2 on. For morein-depth information about the instrument see Münkel et al (2007) and Kotthaus et al (2016).…”

Section: Vaisala Cl31mentioning

confidence: 99%

Comparison of aerosol lidar retrieval methods for boundary layer height detection using ceilometer aerosol backscatter data

Caicedo

Rappenglück

Lefer³

et al. 2017

Atmos. Meas. Tech.

View full text Add to dashboard Cite

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“…However, it has been shown that the signal reduction due to the near-field problem can be compensated for well with the manufacturer's correction (Markowicz et al, 2008). The unique single-lens design gives full overlap of the transmitter and receiver field of view at an altitude of 0 m (Münkel et al, 2007), which allows CT25k ceilometers to obtain high signal-to-noise ratio for lidar return signals at a low altitude. The working wavelength of CT25k ceilometers is ∼ 905 nm where water vapor absorption exists (Wiegner et al, 2014;Wiegner and Gasteiger, 2015).…”

Section: Datamentioning

confidence: 99%

“…A newer version of the Vaisala Ceilometer CL31 has been used instead of the Vaisala CT25K since 2010 at the ARM SGP site. The Vaisala CL31 has the same laser system, wavelength and measurement range as CT25k but improved spatial and temporal resolution and algorithms for cloud amount and mixing layer height detection (Münkel et al, 2007). To estimate the possible response changing of the CL31 ceilometer in different years, we compared the same 3 years (2012,2013,2014) of yearly average ceilometer backscatter profiles under nighttime clear conditions as used for the CT25K.…”

Section: Test In a Different Regionmentioning

confidence: 99%

“…Ceilometers were originally developed for cloud-based height retrieval. With the improvement of accuracy and power, the potential capabilities of ceilometers to detect mixing layer height and aerosol optical properties have been explored recently (Münkel et al, 2007;Markowicz et al, 2008;Heese et al, 2010;Tsaknakis et al, 2011;Wiegner and Geiß, 2012). Another distinct advantage of ceilometers is their small overlap distance, which makes them suitable to detect aerosol information near the surface.…”

Section: Introductionmentioning

confidence: 99%

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Remote sensing of PM2.5 during cloudy and nighttime periods using ceilometer backscatter

Joseph

Min

et al. 2017

Atmos. Meas. Tech.

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Abstract. Monitoring PM2.5 (particulate matter with aerodynamic diameter d ≤ 2.5 µm) mass concentration has become of more importance recently because of the negative impacts of fine particles on human health. However, monitoring PM2.5 during cloudy and nighttime periods is difficult since nearly all the passive instruments used for aerosol remote sensing are not able to measure aerosol optical depth (AOD) under either cloudy or nighttime conditions. In this study, an empirical model based on the regression between PM2.5 and the near-surface backscatter measured by ceilometers was developed and tested using 6 years of data (2006 to 2011) from the Howard University Beltsville Campus (HUBC) site. The empirical model can explain ∼ 56, ∼ 34 and ∼ 42 % of the variability in the hourly average PM2.5 during daytime clear, daytime cloudy and nighttime periods, respectively. Meteorological conditions and seasons were found to influence the relationship between PM2.5 mass concentration and the surface backscatter. Overall the model can explain ∼ 48 % of the variability in the hourly average PM2.5 at the HUBC site when considering the seasonal variation. The model also was tested using 4 years of data (2012 to 2015) from the Atmospheric Radiation Measurement (ARM) Southern Great Plains (SGP) site, which was geographically and climatologically different from the HUBC site. The results show that the empirical model can explain ∼ 66 and ∼ 82 % of the variability in the daily average PM2.5 at the ARM SGP site and HUBC site, respectively. The findings of this study illustrate the strong need for ceilometer data in air quality monitoring under cloudy and nighttime conditions. Since ceilometers are used broadly over the world, they may provide an important supplemental source of information of aerosols to determine surface PM2.5 concentrations.

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Relationship between boundary layer heights and growth rates with ground‐level ozone in Houston, Texas

et al. 2014

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Measurements and predictions of ambient ozone (O 3 ), planetary boundary layer (PBL) height, the surface energy budget, wind speed, and other meteorological parameters were made near downtown Houston, Texas, and were used to investigate meteorological controls on elevated levels of ground-level O 3 . Days during the study period (1 April 2009 to 31 December 2010 for measurements and 15 April 2009 to 17 October 2009 for modeled) were classified into low (LO 3 ) and high ozone (HO 3 ) days. The majority of observed high HO 3 days occurred in a postfrontal environment. Observations showed there is not a significant difference in daily maximum PBL heights on HO 3 and LO 3 days. Modeling results showed large differences between maximum PBL heights on HO 3 and LO 3 days. Nighttime and early morning observed and modeled PBL heights are consistently lower on HO 3 days than on LO 3 days. The observed spring LO 3 days had the most rapid early morning PBL growth (~350 m h À1 ) while the fall HO 3 group had the slowest (~200 m h À1 ). The predicted maximum average hourly morning PBL growth rates were greater on HO 3(624 m h À1 ) days than LO 3 days (361 m h À1 ). Observed turbulent mixing parameters were up to 2-3 times weaker on HO 3 days, which indicate large-scale subsidence associated with high-pressure systems (leading to clear skies and weak winds) substantially suppresses mixing. Lower surface layer ventilation coefficients were present in the morning on HO 3 days in the spring and fall, which promotes the accumulation of O 3 precursors near the surface.

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Retrieval of mixing height and dust concentration with lidar ceilometer

Cited by 246 publications

References 6 publications

Comparison of aerosol lidar retrieval methods for boundary layer height detection using ceilometer aerosol backscatter data

Comparison of aerosol lidar retrieval methods for boundary layer height detection using ceilometer aerosol backscatter data

Remote sensing of PM2.5 during cloudy and nighttime periods using ceilometer backscatter

Relationship between boundary layer heights and growth rates with ground‐level ozone in Houston, Texas

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