Vertical profiles of pure dust and mixed smoke-dust plumes inferred from inversion of multiwavelength Raman/polarization lidar data and comparison to AERONET retrievals and in situ observations

D. Mueller, Igor Veselovskii, Alexei Kolgotin, Matthias Tesche, Albert Ansmann, Oleg Dubovik

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)
214 Downloads (Pure)

Abstract

We present for the first time vertical profiles of microphysical properties of pure mineral dust (largely unaffected by any other aerosol types) on the basis of the inversion of optical data collected with multiwavelength polarization Raman lidar. The data were taken during the Saharan Mineral Dust Experiment (SAMUM) in Morocco in 2006. We also investigated two cases of mixed dust-smoke plumes on the basis of data collected during the second SAMUM field campaign that took place in the Republic of Cape Verde in 2008. Following the experience of the Aerosol Robotic Network (AERONET), the dust is modeled as a mixture of spherical particles and randomly oriented spheroids. The retrieval is performed from the full set of lidar input data (three backscatter coefficients, two extinction coefficients, and one depolarization ratio) and from a reduced set of data in which we exclude the depolarization ratio. We find differences of the microphysical properties depending on what kind of optical data combination we use. For the case of pure mineral dust, the results from these two sets of optical data are consistent and confirm the validity of the spheroid particle model for data inversion. Our results indicate that in the case of pure mineral dust we do not need depolarization information in the inversion. For the mixture of dust and biomass burning, there seem to be more limitations in the retrieval accuracy of the various data products. The evaluation of the quality of our data products is done by comparing our lidar-derived data products (vertically resolved) to results from AERONET Sun photometer observations (column-averaged) carried out at the lidar field site. Our results for dust effective radius show agreement with the AERONET observations within the retrieval uncertainties. Regarding the complex refractive index a comparison is difficult, as AERONET provides this parameter as wavelength-dependent quantity. In contrast, our inversion algorithm provides this parameter as a wavelength-independent quantity. We also show some comparison to results from airborne in situ observation. A detailed comparison to in situ results will be left for a future contribution. (c) 2013 Optical Society of America

Original languageEnglish
Pages (from-to)3178-3202
Number of pages25
JournalApplied Optics
Volume52
Issue number14
DOIs
Publication statusPublished - 10 May 2013

Keywords

  • MICROPHYSICAL PARTICLE PARAMETERS
  • SIZE DISTRIBUTION
  • SPECTRAL-RESOLUTION LIDAR
  • SKY RADIANCE MEASUREMENTS
  • SAHARAN DUST
  • RAMAN-LIDAR
  • CAPE-VERDE
  • AEROSOL OPTICAL-PROPERTIES
  • SAMUM 2006
  • MINERAL DUST

Fingerprint

Dive into the research topics of 'Vertical profiles of pure dust and mixed smoke-dust plumes inferred from inversion of multiwavelength Raman/polarization lidar data and comparison to AERONET retrievals and in situ observations'. Together they form a unique fingerprint.

Cite this