Synergy between CALIOP and MODIS instruments for aerosol monitoring: application to the Po Valley

Royer, P.; Raut, Jean-Christophe; Ajello, G.; Berthier, S.; Chazette, Patrick

doi:10.5194/amt-3-893-2010

Cited by 28 publications

(23 citation statements)

References 54 publications

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“…), LR values increase during the night: for the Raman inversion, the average LR before 19 UTC (profile #1) is 67 ± 12 sr while it reaches 92 ± 18 sr after 19 UTC (profile #2). The values provided by the constrained Klett inversion are higher (79 ± 8 sr, then 101 ± 4 sr) and show less agreement with the literature (references in Table 3), the highest reported values being ∼ 83 sr (Raut and Chazette, 2007;Royer et al, 2010Royer et al, , 2011. This increase in LR is possibly due to a change in the aerosol mix during the night: as the large terrigenous particles lifted from the road tarmac during the day return progressively to the ground, highly absorbing pollution aerosols become dominant.…”

Section: Dust and Biomass Burning Aerosols Observed Above Omskcontrasting

confidence: 39%

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

et al. 2015

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Abstract. In June 2013, a ground-based mobile lidar performed the ∼ 10 000 km ride from Paris to Ulan-Ude, near Lake Baikal, profiling for the first time aerosol optical properties all the way from western Europe to central Siberia. The instrument was equipped with N 2 -Raman and depolarization channels that enabled an optical speciation of aerosols in the low and middle troposphere. The extinction-to-backscatter ratio (also called lidar ratio or LR) and particle depolarization ratio (PDR) at 355 nm have been retrieved. The LR in the lower boundary layer (300-700 m) was found to be 63 ± 17 sr on average during the campaign with a distribution slightly skewed toward higher values that peaks between 50 and 55 sr. Although the difference is small, PDR values observed in Russian cities (> 2 %, except after rain) are systematically higher than the ones measured in Europe (< 1 %), which is probably an effect of the lifting of terrigenous aerosols by traffic on roads. Biomass burning layers from grassland or/and forest fires in southern Russia exhibit LR values ranging from 65 to 107 sr and from 3 to 4 % for the PDR. During the route, desert dust aerosols originating from the Caspian and Aral seas regions were characterized for the first time, with a LR (PDR) of 43 ± 14 sr (23 ± 2 %) for pure dust. The lidar observations also showed that this dust event extended over 2300 km and lasted for ∼ 6 days. Measurements from the Moderate Resolution Imaging Spectrometer (MODIS) show that our results are comparable in terms of aerosol optical thickness (between 0.05 and 0.40 at 355 nm) with the mean aerosol load encountered throughout our route.

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Section: Dust and Biomass Burning Aerosols Observed Above Omskcontrasting

confidence: 39%

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

et al. 2015

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“…The CALIOP level‐1 (version 3.01) products are only considered because level‐2 data were not available at the beginning of this work. Level‐1 data have been inverted using an approach well described in detail by Chazette et al [2010] and by Royer et al [2010b]. CALIOP level‐1 data have different spatial resolutions depending on the altitude ranges.…”

Section: Instrumental Setupmentioning

confidence: 99%

Eyjafjallajökull ash concentrations derived from both lidar and modeling

et al. 2012

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International audienceFollowing the eruption of the Icelandic volcano Eyjafjallajökull on the 14 April 2010, ground-based N2-Raman lidar (GBL) measurements were used to trace the temporal evolution of the ash plume from 16 to 20 April 2010 above the southwestern suburb of Paris. The nighttime overpass of the Cloud-Aerosol LIdar with Orthogonal Polarization onboard Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation satellite (CALIPSO/CALIOP) on 17 April 2010 was an opportunity to complement GBL observations. The plume shape retrieved from GBL has been used to assess the size range of the particles size. The lidar-derived aerosol mass concentrations (PM) have been compared with model-derived PM concentrations held in the Eulerian model Polair3D transport model, driven by a source term inferred from the SEVIRI sensor onboard Meteosat satellite. The consistency between model and ground-based wind lidar and CALIOP observations has been checked. The spatial and temporal structures of the ash plume as estimated by each instrument and by the Polair3D simulations are in agreement. The ash plume was associated with a mean aerosol optical thickness of 0.1{plus minus}0.06 and 0.055{plus minus}0.053 for GBL (355 nm) and CALIOP (532 nm), respectively. Such values correspond to ash mass concentrations of ~400{plus minus}160 and ~720{plus minus}670 µg m-3, respectively, within the ash plume, which was lower than 0.5 km in width. The relative uncertainty is ~75% and mainly due to the assessment of the specific cross-section assuming an aerosol density of 2.6 g cm-3. The simulated ash plume is smoother leading to integrated mass of the same order of magnitude (between 50 and 250 mg m-2

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“…Under polluted conditions, they report low to moderate AOD values ranging between 0.1 and 0.5 (at visible wavelengths). In parallel, multi-year TOMS and MODIS observations over the eastern Mediterranean (Hatzianastassiou et al, 2009) or the Po Valley (Royer et al, 2010) indicate the occurrence of high AOD values (up to more than 0.8 at 500 nm) over large urban areas surrounding megacities.…”

Section: Mallet Et Al: Overview Of the Charmex/adrimed Summer 201mentioning

confidence: 99%

Overview of the Chemistry-Aerosol Mediterranean Experiment/Aerosol Direct Radiative Forcing on the Mediterranean Climate (ChArMEx/ADRIMED) summer 2013 campaign

et al. 2016

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Abstract. The Chemistry-Aerosol Mediterranean Experiment (ChArMEx; http://charmex.lsce.ipsl.fr) is a collaborative research program federating international activities to investigate Mediterranean regional chemistry-climate interactions. A special observing period (SOP-1a) including intensive airborne measurements was performed in the framework of the Aerosol Direct Radiative Impact on the regional climate in the MEDiterranean region (ADRIMED) project during the Mediterranean dry season over the western and central Mediterranean basins, with a focus on aerosol-radiation measurements and their modeling. The SOP-1a took place from 11 June to 5 July 2013. Airborne measurements were made by both the ATR-42 and F-20 French research aircraft operated from Sardinia (Italy) and instrumented for in situ and remote-sensing measurements, respectively, and by sounding and drifting balloons, launched in Minorca. The experimental setup also involved several ground-based measurement sites on islands including two ground-based reference stations in Corsica and Lampedusa and secondary monitoring sites in Minorca and Sicily. Additional measurements including lidar profiling were also performed on alert during aircraft operations at EARLINET/ACTRIS stations at Granada and Barcelona in Spain, and in southern Italy. Remote-sensing aerosol products from satellites (MSG/SEVIRI, MODIS) and from the AERONET/PHOTONS network were also used. Dedicated meso-scale and regional modeling experiments were performed in relation to this observational effort. We provide here an overview of the different surface and aircraft observations deployed during the ChArMEx/ADRIMED period and of associated modeling studies together with an analysis of the synoptic conditions that determined the aerosol emission and transport. Meteorological conditions observed during this campaign (moderate temperatures and southern flows) were not favorable to producing high levels of atmospheric pollutants or intense biomass burning events in the region. However, numerous mineral dust plumes were observed during the campaign, with the main sources located in Morocco, Algeria and Tunisia, leading to aerosol optical depth (AOD) values ranging between 0.2 and 0.6 (at 440 nm) over the western and central Mediterranean basins. One important point of this experiment concerns the direct observations of aerosol extinction onboard the ATR-42, using the CAPS system, showing local maxima reaching up to 150 M m −1 within the dust plume. Non-negligible aerosol extinction (about 50 M m −1 ) has also been observed within the marine boundary layer (MBL). By combining the ATR-42 extinction coefficient observations with absorption and scattering measurements, we performed a complete optical closure revealing excellent agreement with estimated optical properties. This additional information on extinction properties has allowed calculation of the dust single scattering albedo (SSA) with a high level of confidence over the western Mediterranean. Our results show a moderate variability from 0....

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Synergy between CALIOP and MODIS instruments for aerosol monitoring: application to the Po Valley

Cited by 28 publications

References 54 publications

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

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

Eyjafjallajökull ash concentrations derived from both lidar and modeling

Overview of the Chemistry-Aerosol Mediterranean Experiment/Aerosol Direct Radiative Forcing on the Mediterranean Climate (ChArMEx/ADRIMED) summer 2013 campaign

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