Lidar overlap control as a mean for extended measurement reliability Ilya Serikov, Holger Linné, Friedhelm Jansen, Björn Brügmann, Monika Pfeiffer, Jens.

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Presentation transcript:

Lidar overlap control as a mean for extended measurement reliability Ilya Serikov, Holger Linné, Friedhelm Jansen, Björn Brügmann, Monika Pfeiffer, Jens Bösenberg Max Planck Institute for Meteorology, Hamburg

Outline a) The overlap control issues: An approach to measure overlap function Optical scrambler as a solution for identical overlap Overlap correction in extinction retrieval b) Lidar / Ceilometer comparison * The subject presented is illustrated on the data collected with one of two Raman lidars of Max Planck Institute for Meteorology (Hamburg) deployed on Deebles Point, Barbados (59.43W 13.16N) since

Sun's azimuth and elevation angles, (projection onto a two-dimensional plane)

Principle optical layout

Telescope assignment “close” range Ø 2 cm “far” range Ø 40 cm “near” range Ø 15 cm

Overlap function & lidar returns

ALOMAR (Norway), , 03:00-06:00 UTC Overlap function, far range telescope

Overlap function, near range telescope ALOMAR (Norway), , 03:00-06:00 UTC

Particle backscatter 532nm, far & close range resolution: 30 minutes, 60÷180 meters

Particle backscatter 532nm, far & close range resolution: 30 minutes, 60÷180 meters

Particle backscatter 532nm, far & close range resolution: 2 minutes, 60 meters

Particle backscatter 532nm, far & close range resolution: 2 minutes, 60 meters

Particle backscatter 355nm, far & near range resolution: 2 minutes, 60 meters

Sun's azimuth and elevation angles, (projection onto a two-dimensional plane) Lidar FOV

Raman lidar returns, 532nm, near & far range resolution: signals: 40 minutes, 60m overlap: 3 hours, 60m÷5km

Statistical uncertainty of lidar returns, near & far range

Raman lidar returns, 532nm, near & far range resolution: signals: 40 minutes, 60m overlap: 3 hours, 60m÷5km

Statistical uncertainty of lidar returns, near & far range

Particle extinction, 532nm, near & far range resolution: 40 minutes, 0.18÷3km

Overlap function, far range telescope, 532nm, resolution: 3 hours, 60m÷5km

Overlap function, far range telescope, 532nm, resolution: 3 hours, 60m÷5km

Particle extinction, 532nm, near & far range resolution: extinction: 40 minutes, 0.18÷3km overlap: 3 hours, 60m÷5km

Particle extinction, 532nm, near & far range resolution: extinction: 40 minutes, 0.18÷3km overlap: 3 hours, 60m÷5km

Aerosol optical depth: lidar (0.6-12km) / sun-photometer We thank J. M. Prospero for establishing and maintaining the AERONET site at Ragged Point, Barbados.

Aerosol optical depth: lidar (0-12km) / sun-photometer We thank J. M. Prospero for establishing and maintaining the AERONET site at Ragged Point, Barbados.

Aerosol optical depth: lidar (0.6-12km) mask: particle backscatter > 2 / (Mm sr)

Overlap function, far range telescope, 532nm, resolution: 3 hours, 60m÷5km

Raman lidar returns, 532nm, near & far range resolution: signals: 40 minutes, 60m overlap: 3 hours, 60m÷5km

Particle extinction, 532nm, near & far range resolution: extinction: 40 minutes, 0.18÷3km overlap: 3 hours, 60m÷5km

Particle extinction, 355nm, near & far range resolution: 40 minutes, 0.18÷3km

resolution: 30 minutes, 0.18÷3km Particle backscatter & extinction 532nm, far range

resolution: 30 minutes, 0.18÷1.8km Particle backscatter & extinction 532nm, near range

resolution: 30 minutes, 180m Particle backscatter & extinction 532nm, close range

resolution: 30 minutes, 0.18÷3km Particle backscatter & extinction 355nm, far range

resolution: 30 minutes, 0.18÷1.8km Particle backscatter & extinction 355nm, near range

resolution: 30 minutes, 180m Particle backscatter & extinction 355nm, close range

Aerosol optical depth: lidar (0.6-12km) / sun-photometer We thank J. M. Prospero for establishing and maintaining the AERONET site at Ragged Point, Barbados.

Aerosol optical depth: lidar (0-12km) / sun-photometer We thank J. M. Prospero for establishing and maintaining the AERONET site at Ragged Point, Barbados.

Attenuated backscatter 1064nm, far/near-range resolution: 2 minutes, 60 meters

Aerosol optical depth: lidar (0.6-12km) mask: particle backscatter > 2 / (Mm sr)

Conclusion a) optical scrambling allows no overlap-depending artefacts in lidar products derived through a signal ratio b) measuring the overlap (continuously) allows extending the system reliability for extinction retrieval in other words: the lidar may be misaligned to some (even quite significant) extent, we should just know how much is it by measuring the overlap function.

Lidar / Ceilometer comparion

Lidar: attenuated backscatter 1064nm resolution: 2 minutes, 60 meters Normalized attenuated backscatter

resolution: lidar: 2min & 60m; ceilometer: 10min & 120m Attenuated backscatter 1064nm, lidar & “Jenoptik 15k”

resolution: lidar: 2min & 60m; ceilometer: 10min & 120m Attenuated backscatter 1064nm, lidar & “Jenoptik 15k-x”

Attenuated backscatter 1064nm, lidar & “Jenoptik 15k”

Acknowledgments: We thank Dr. David A. Farrell (the Caribbean Institute for Meteorology and Hydrology) and his research team, especially Marvin R. Forde, for helping us establishing and maintaining the site.

Thank you!