Lidar profiling of aerosol optical properties from Paris to Lake  Baikal (Siberia)

Dieudonné, Elsa; Chazette, Patrick; Marnas, Fabien; Totems, Julien; Shang, Xiaoxia

doi:10.5194/acp-15-5007-2015

Cited by 38 publications

(51 citation statements)

References 54 publications

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“…Three aerosol types are considered: (i) dust-like aerosols with values of BER and PDR centred on 0.022 sr −1 and 20 %, respectively, (ii) pollution aerosols with BER and PDR centred on 0.015 sr −1 and 2 %, respectively, and (iii) marine aerosols with mean values of BER and PDR centred on 0.04 sr −1 and 0 %, respectively. For each aerosol type, literature sometimes reports a large range of values, as shown in Tables 1 and 3 of Dieudonné et al (2015) for dust and pollution aerosols, respectively. These authors report at the same wavelength BER from 0.013 to 0.026 sr −1 and PDR from 13 to 25 % for pure dust or dusty mix (0.011-0.017 sr −1 and 3-5 %, respectively, for pollution) aerosols.…”

Section: Evidence Of Contributions By Aerosol Type As Discriminated Bmentioning

confidence: 99%

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Temporal consistency of lidar observations during aerosol transport events in the framework of the ChArMEx/ADRIMED campaign at Minorca in June 2013

et al. 2016

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Abstract. We performed synergetic daytime and nighttime active and passive remote-sensing observations at Minorca (Balearic Islands, Spain), over more than 3 weeks during the Chemistry-Aerosol Mediterranean Experiment/Aerosol Direct Radiative Effect in the Mediterranean (ChArMEx/ADRIMED) special observation period (SOP 1a, June-July 2013). We characterized the aerosol optical properties and type in the low and middle troposphere using an automated procedure combining Rayleigh-Mie-Raman lidar (355, 387 and 407 nm) with depolarization (355 nm) and AERONET Cimel ® sun-photometer data. Results show a high variability due to varying dynamical forcing. The mean column-averaged lidar backscatter-to-extinction ratio (BER) was close to 0.024 sr −1 (lidar ratio of ∼ 41.7 sr), with a large dispersion of ±33 % over the whole observation period due to changing atmospheric transport regimes and aerosol sources. The ground-based remote-sensing measurements, coupled with satellite observations, allowed the documentation of (i) dust particles up to 5 km (above sea level) in altitude originating from Morocco and Algeria from 15 to 18 June with a peak in aerosol optical thickness (AOT) of 0.25 ± 0.05 at 355 nm, (ii) a long-range transport of biomass burning aerosol (AOT = 0.18 ± 0.16) related to North American forest fires detected from 26 to 28 June 2013 by the lidar between 2 and 7 km and (iii) mixture of local sources including marine aerosol particles and pollution from Spain. During the biomass burning event, the high value of the particle depolarization ratio (8-14 %) may imply the presence of dust-like particles mixed with the biomass burning aerosols in the mid-troposphere. For the field campaign period, we also show linearity with SEVIRI retrievals of the aerosol optical thickness despite 35 % relative bias, which is discussed as a function of aerosol type.

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Section: Evidence Of Contributions By Aerosol Type As Discriminated Bmentioning

confidence: 99%

“…Two validated (e.g. Dieudonné et al, 2015) measurement synergy types have been used to retrieve the aerosol optical properties from the lidar. During daytime the sun-photometer AOT 355 is considered as a constraint for the lidar inversion as in Chazette (2003).…”

Section: Raman Lidarmentioning

confidence: 99%

Temporal consistency of lidar observations during aerosol transport events in the framework of the ChArMEx/ADRIMED campaign at Minorca in June 2013

et al. 2016

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“…Lidar measurements along the Caspian and Aral Sea region and Lake Balkhash in Kazakhstan were performed by Dieudonné et al (2015). Dieudonné et al (2015) showed that dust layers originating in the Caspian and Aral Sea region can regularly spread over wide areas of Russia and last for several days.…”

Section: Introductionmentioning

confidence: 99%

“…A lidar is operated in Aksu (northwestern Taklamakan; Kai et al, 2008), where local dust was measured from ground to a height of 6 km during strong dust outbreaks as well as lofted long-range transported dust layers at heights of 11 km (Mikami et al, 2006). Lidar measurements along the Caspian and Aral Sea region and Lake Balkhash in Kazakhstan were performed by Dieudonné et al (2015). Dieudonné et al (2015) showed that dust layers originating in the Caspian and Aral Sea region can regularly spread over wide areas of Russia and last for several days.…”

Section: Introductionmentioning

confidence: 99%

Long-term profiling of mineral dust and pollution aerosol with multiwavelength polarization Raman lidar at the Central Asian site of Dushanbe, Tajikistan: case studies

et al. 2017

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Abstract. For the first time, continuous vertically resolved aerosol measurements were performed by lidar in Tajikistan, Central Asia. Observations with the multiwavelength polarization Raman lidar Polly XT were conducted during CADEX (Central Asian Dust EXperiment) in Dushanbe, Tajikistan, from March 2015 to August 2016. Co-located with the lidar, a sun photometer was also operated. The goal of CADEX is to provide an unprecedented data set on vertically resolved aerosol optical properties in Central Asia, an area highly affected by climate change but largely missing vertically resolved aerosol measurements. During the 18-month measurement campaign, mineral dust was detected frequently from ground to the cirrus level height. In this study, an overview of the measurement period is given and four typical but different example measurement cases are discussed in detail. Three of them are dust cases and one is a contrasting pollution aerosol case. Vertical profiles of the measured optical properties and the calculated dust and non-dust mass concentrations are presented. Dust source regions were identified by means of backward trajectory analyses. A lofted layer of Middle Eastern dust with an aerosol optical thickness (AOT) of 0.4 and an extinction-related Ångström exponent of 0.41 was measured. In comparison, two near-ground dust cases have Central Asian sources. One is an extreme dust event with an AOT of 1.5 and Ångström exponent of 0.12 and the other one is a most extreme dust event with an AOT of above 4 (measured by sun photometer) and an Ångström exponent of −0.08. The observed lidar ratios (and particle linear depolarization ratios) in the presented dust cases range from 40.3 to 46.9 sr (and 0.18-0.29) at 355 nm and from 35.7 to 42.9 sr (0.31-0.35) at 532 nm wavelength. The particle linear depolarization ratios indicate almost unpolluted dust in the case of a lofted dust layer and pure dust in the near-ground dust cases. The lidar ratio values are lower than typical lidar ratio values for Saharan dust (50-60 sr) and comparable to Middle Eastern or west-Asian dust lidar ratios (35-45 sr). In contrast, the presented case of pollution aerosol of local origin has an Ångström exponent of 2.07 and a lidar ratio (particle linear depolarization ratio) of 55.8 sr (0.03) at 355 nm and 32.8 sr (0.08) at 532 nm wavelength.

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“…We have noted the dispersion in the PBL of dust-like aerosols is efficient during the afternoons with mean vertical speed velocity larger than 1 ms -1 . This study has to be continued and the aerosol optical properties retrieved by the lidar measurements in terms of PDR and BER should be compared to those we met within London [6] and during the experiment conducted from Paris (France) to the lake Baikal (Russia) in 2013 [7].…”

Section: Conclusive Discussionmentioning

confidence: 99%

Intense Particulate Pollution Events Observed with Lidar over the Paris Megalopolis

Chazette

Royer

2016

EPJ Web of Conferences

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The great particulate pollution event that affected the Paris Megalopolis in March 2014 was due to long-range transport from the northern-northeastern Europe. Although this phenomenon has appeared as exceptional in the media, this is not an exception and similar events have already been observed by lidar measurements. Here we will briefly describe and illustrate the origin of this intense pollution obviously harmful to health.

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Lidar profiling of aerosol optical properties from Paris to Lake Baikal (Siberia)

Cited by 38 publications

References 54 publications

Temporal consistency of lidar observations during aerosol transport events in the framework of the ChArMEx/ADRIMED campaign at Minorca in June 2013

Temporal consistency of lidar observations during aerosol transport events in the framework of the ChArMEx/ADRIMED campaign at Minorca in June 2013

Long-term profiling of mineral dust and pollution aerosol with multiwavelength polarization Raman lidar at the Central Asian site of Dushanbe, Tajikistan: case studies

Intense Particulate Pollution Events Observed with Lidar over the Paris Megalopolis

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