Continuous monitoring of the boundary-layer top with lidar

Baars, Holger; Ansmann, Albert; Engelmann, Ronny; Althausen, Dietrich

doi:10.5194/acp-8-7281-2008

Cited by 264 publications

(261 citation statements)

References 32 publications

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“…Aerosol backscatter BLHs are derived with a covariance wavelet transform utilizing the Haar wavelet compound step function with multiple user-defined wavelet dilations (Cohn and Angevine, 2000;Davis et al, 2000;Brooks, 2003;Baars et al, 2008;Compton et al, 2013;Uzan et al, 2016). This method identifies the sharp aerosol backscatter gradient corresponding to the top of the BL by calculating the wavelet transform.…”

Section: Haar Wavelet Methodsmentioning

confidence: 99%

“…Apart from a few occasions (e.g., André and Mahrt, 1982;Berman et al, 1999;Day et al, 2010), NSL measurements are particularly uncommon since most radiosonde launches are performed during daytime ML hours. In recent years, remote-sensing techniques such as light detection and ranging (lidar), radio acoustic sounding systems (RASS), and sonic detection and ranging (sodar) systems have allowed for the continuous monitoring of the BL (Cohn and Angevine, 2000;Schäfer et al, 2011;Seibert et al, 2000;Emeis et al, 2004Emeis et al, , 2006Emeis et al, , 2012Eresmaa et al, 2006;Baars et al, 2008;McKendry et al, 2009;Muñoz and Undurraga, 2010;Haman et al, 2012;Milroy et al, 2012;Compton et al, 2013;Scarino et al, 2014;Wiegner and Gasteiger, 2015;Uzan et al, 2016). Ceilometers in particular offer a low-maintenance and low-cost solution to constantly monitoring the ML using aerosol backscatter while also facilitating the monitoring of the nocturnal stable layer, internal aerosol layers, and the nighttime residual layer (Haman et al, 2012Pandolfi et al, 2013;Peña et al, 2013).…”

Section: Introductionmentioning

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: Haar Wavelet Methodsmentioning

confidence: 99%

Section: Introductionmentioning

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.

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show abstract

“…First, local aerosol vertical distributions are influenced by horizontal transportation of aerosols besides vertical turbulence mixing. Second, the nighttime aerosol residual layer has weak linkages with ABL processes and it is hard to distinguish the ABL aerosol (Martucci et al, 2007;Baars et al, 2008;Ferrare et al, 2013), especially over land. Therefore, a careful evaluation of lidar-based BLH is needed in order to provide consistent BLH based on thermodynamical properties under different surface and thermal conditions.…”

Section: T Luo Et Al: Lidar-based Remote Sensing Of Atmospheric Boumentioning

confidence: 99%

Lidar-based remote sensing of atmospheric boundary layer height over land and ocean

2014

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Abstract. Atmospheric boundary layer (ABL) processes are important in climate, weather and air quality. A better understanding of the structure and the behavior of the ABL is required for understanding and modeling of the chemistry and dynamics of the atmosphere on all scales. Based on the systematic variations of the ABL structures over different surfaces, different lidar-based methods were developed and evaluated to determine the boundary layer height and mixing layer height over land and ocean. With Atmospheric Radiation Measurement Program (ARM) Climate Research Facility (ACRF) micropulse lidar (MPL) and radiosonde measurements, diurnal and season cycles of atmospheric boundary layer depth and the ABL vertical structure over ocean and land are analyzed. The new methods are then applied to satellite lidar measurements. The aerosol-derived global marine boundary layer heights are evaluated with marine ABL stratiform cloud top heights and results show a good agreement between them.

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“…Case studies, but also long-term lidar observations performed during the last decade at various EARLINET stations, revealed that the DFO have to be much lower than 600 m in order to detect the boundary layer at European latitudes, especially during wintertime (e.g., Matthias and Bösenberg, 2002;Matthias et al, 2004;Amiridis et al, 2007;Baars et al, 2008). Measurements of the aerosols within the PBL are in particular required during daytime, when the convection is stronger.…”

Section: Introductionmentioning

confidence: 99%

Using paraxial approximation to describe the optical setup of a typical EARLINET lidar system

Kokkalis

2017

Atmos. Meas. Tech.

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Abstract. The mathematical formulation for the optical setup of a typical EARLINET lidar system is given here. The equations describing a lidar system from the emitted laser beam to the projection of the telescope aperture on the final receiving unit (i.e., photomultiplier or photodiode) are presented, based on paraxial approximation and geometric optics approach. The receiving optical setup includes a telescope, a collimating lens, an interference filter and the ensemble objective eyepiece. The set of the derived equations interconnects major parameters of the optical components (e.g., focal lengths, diameters, angles of incidence), revealing their association with the distance of full overlap of the system. These equations may used complementarily with an optical design software, for the preliminary design of a system or can be used as a quick check up tool of an existing lidar system. The evaluation of the formulation on a real system is performed with ray-tracing simulations, revealing an overall good performance with relative differences of the order of 5 % mainly attributed to the limitations of the thin lens approximation.

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Continuous monitoring of the boundary-layer top with lidar

Cited by 264 publications

References 32 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

Lidar-based remote sensing of atmospheric boundary layer height over land and ocean

Using paraxial approximation to describe the optical setup of a typical EARLINET lidar system

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