Quantification of ozone reductions within the Saharan air layer through a 13-year climatologic analysis of ozone profiles

Andrey, Javier; Cuevas, E.; Parrondo, M. C.; Alonso-Pérez, Silvia; Redondas, Alberto; Gil-Ojeda, Manuel

doi:10.1016/j.atmosenv.2013.11.030

Cited by 39 publications

(34 citation statements)

References 31 publications

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“…The horizontal bars on the aircraft profile (black curve) are the standard deviation about the mean value. For the retrieval of the volume concentration profiles from the in situ aircraft measurements, a refractive index of 1.54-i0.0 (McConnell et al, 2010) was assumed and Mie theory was applied assuming spherical aerosol particles as explained by Andrey et al (2014) and discussed in Appendix A. This refractive index value is very similar to the one obtained with the regularization technique for the nighttime measurements, which was 1.55 ± 0.05.…”

Section: Comparison Of Airborne In Situ Measurements Andsupporting

confidence: 55%

“…Details on aircraft measurements can be found in Andrey et al (2014) and BravoAranda et al (2015). Here we give a short overview of the instruments used for our study: the Cloud and Aerosol Spectrometer with Polarization detection (CAS-POL) and the the Passive Cavity Aerosol Spectrometer (PCASP-100X).…”

Section: Aircraft In Situ Instrumentationmentioning

confidence: 99%

“…Measurements performed at Granada were coordinated with a flight of the CASA C-212-200 research aircraft above the station (Andrey et al, 2014;Bravo-Aranda et al, 2015) on 27 June 2011. The aircraft was equipped with in situ instrumentation that allowed us to compare for the first time, up to the best of our knowledge, the microphysical properties profiles retrieved with LIRIC with well-established simultaneous in situ measurements.…”

Section: Introductionmentioning

confidence: 99%

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A comparative study of aerosol microphysical properties retrieved from ground-based remote sensing and aircraft in situ measurements during a Saharan dust event

Granados-Muñoz¹,

Bravo-Aranda

Baumgardner

et al. 2016

Atmos. Meas. Tech.

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Abstract. In this work we present an analysis of aerosol microphysical properties during a mineral dust event taking advantage of the combination of different state-of-theart retrieval techniques applied to active and passive remote sensing measurements and the evaluation of some of those techniques using independent data acquired from in situ aircraft measurements. Data were collected in a field campaign performed during a mineral dust outbreak at the Granada, Spain, experimental site (37.16 • N, 3.61 • W, 680 m a.s.l.) on 27 June 2011. Column-integrated properties are provided by sun-and star-photometry, which allows for a continuous evaluation of the mineral dust optical properties during both day and nighttime. Both the linear estimation and AERONET (Aerosol Robotic Network) inversion algorithms are applied for the retrieval of the column-integrated microphysical particle properties. In addition, vertically resolved microphysical properties are obtained from a multi-wavelength Raman lidar system included in EARLINET (European Aerosol Research Lidar Network), by using both LIRIC (Lidar Radiometer Inversion Code) algorithm during daytime and an algorithm applied to the Raman measurements based on the regularization technique during nighttime. LIRIC retrievals Published by Copernicus Publications on behalf of the European Geosciences Union. M. J. Granados-Muñoz et al.: Aerosol microphysical properties profiles during a dust eventreveal the presence of dust layers between 3 and 5 km a.s.l. with volume concentrations of the coarse spheroid mode up to 60 µm 3 cm −3 . The combined use of the regularization and LIRIC methods reveals the night-to-day evolution of the vertical structure of the mineral dust microphysical properties and offers complementary information to that from column-integrated variables retrieved from passive remote sensing. Additionally, lidar depolarization profiles and LIRIC retrieved volume concentration are compared with aircraft in situ measurements. This study presents for the first time a comparison of the total volume concentration retrieved with LIRIC with independent in situ measurements, obtaining agreement within the estimated uncertainties for both methods and quite good agreement for the vertical distribution of the aerosol layers. Regarding the depolarization, the first published data set of the CAS-POL for polarization ratios is presented here and qualitatively compared with the lidar technique.

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Section: Comparison Of Airborne In Situ Measurements Andsupporting

confidence: 55%

Section: Aircraft In Situ Instrumentationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A comparative study of aerosol microphysical properties retrieved from ground-based remote sensing and aircraft in situ measurements during a Saharan dust event

Granados-Muñoz¹,

Bravo-Aranda

Baumgardner

et al. 2016

Atmos. Meas. Tech.

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“…As a consequence, a picture like the so-called "ozone paradox" (Thompson and Hudson, 1999) was shown to be no longer valid (Sauvage et al, 2006) owing to the insight provided by additional in situ observations. Recent work has shown evidence for the removal of ozone in the Saharan dust plume (Andrey et al, 2014) which is correlated with both dust loading and total amount of water present.…”

Section: Atmosmentioning

confidence: 99%

Tropospheric ozone and its precursors from the urban to the global scale from air quality to short-lived climate forcer

et al. 2015

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Abstract. Ozone holds a certain fascination in atmospheric science. It is ubiquitous in the atmosphere, central to tropospheric oxidation chemistry, yet harmful to human and ecosystem health as well as being an important greenhouse gas. It is not emitted into the atmosphere but is a byproduct of the very oxidation chemistry it largely initiates. Much effort is focused on the reduction of surface levels of ozone owing to its health and vegetation impacts, but recent efforts to achieve reductions in exposure at a country scale have proved difficult to achieve owing to increases in background ozone at the zonal hemispheric scale. There is also a growing realisation that the role of ozone as a short-lived climate pollutant could be important in integrated air quality climate change mitigation. This review examines current understanding of the processes regulating tropospheric ozone at global to local scales from both measurements and models. It takes the view that knowledge across the scales is important for dealing with air quality and climate change in a synergistic manner. The review shows that there remain a number of clear challenges for ozone such as explaining surface trends, incorporating new chemical understanding, ozone-climate coupling, and a better assessment of impacts. There is a clear and present need to treat ozone across the range of scales, a transboundary issue, but with an emphasis on the hemispheric scales. New observational opportunities are offered both by satellites and small sensors that bridge the scales.

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“…In addition, the summertime FT of the northern subtropical Atlantic is frequently affected by air masses that are advected from the African continent (e.g. Prospero et al, 2002;Rodríguez et al, 2011;Andrey et al, 2014). At that time of the year there are strong and extended heat lows over the African continent at 20-35 • N. These heat lows modify the transport pathways to the FT and enable mixing from the PBL to the FT (e.g.…”

Section: Dehydration Via Condensation Versus Vertical Mixing From Thementioning

confidence: 99%

Empirical validation and proof of added value of MUSICA's tropospheric δD remote sensing products

et al. 2015

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Abstract. The project MUSICA (MUlti-platform remote Sensing of Isotopologues for investigating the Cycle of Atmospheric water) integrates tropospheric water vapour isotopologue remote sensing and in situ observations. This paper presents a first empirical validation of MUSICA's H 2 O and δD remote sensing products, generated from groundbased FTIR (Fourier transform infrared), spectrometer and space-based IASI (infrared atmospheric sounding interferometer) observation. The study is made in the area of the Canary Islands in the subtropical northern Atlantic. As reference we use well calibrated in situ measurements made aboard an aircraft (between 200 and 6800 m a.s.l.) by the dedicated ISOWAT instrument and on the island of Tenerife at two different altitudes (at Izaña, 2370 m a.s.l., and at Teide, 3550 m a.s.l.) by two commercial Picarro L2120-i water isotopologue analysers.The comparison to the ISOWAT profile measurements shows that the remote sensors can well capture the variations in the water vapour isotopologues, and the scatter with respect to the in situ references suggests a δD random uncertainty for the FTIR product of much better than 45 ‰ in the lower troposphere and of about 15 ‰ for the middle troposphere. For the middle tropospheric IASI δD product the study suggests a respective uncertainty of about 15 ‰. In both remote sensing data sets we find a positive δD bias of 30-70 ‰.Complementing H 2 O observations with δD data allows moisture transport studies that are not possible with H 2 O observations alone. We are able to qualitatively demonstrate the added value of the MUSICA δD remote sensing data. We document that the δD-H 2 O curves obtained from the different in situ and remote sensing data sets (ISOWAT, Picarro at Izaña and Teide, FTIR, and IASI) consistently identify two different moisture transport pathways to the subtropical north eastern Atlantic free troposphere.

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Quantification of ozone reductions within the Saharan air layer through a 13-year climatologic analysis of ozone profiles

Cited by 39 publications

References 31 publications

A comparative study of aerosol microphysical properties retrieved from ground-based remote sensing and aircraft in situ measurements during a Saharan dust event

A comparative study of aerosol microphysical properties retrieved from ground-based remote sensing and aircraft in situ measurements during a Saharan dust event

Tropospheric ozone and its precursors from the urban to the global scale from air quality to short-lived climate forcer

Empirical validation and proof of added value of MUSICA's tropospheric δD remote sensing products

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