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Article ; Online: Impact of different sources of precursors on an ozone pollution outbreak over Europe analysed with IASI+GOME2 multispectral satellite observations and model simulations

S. Okamoto / J. Cuesta / M. Beekmann / G. Dufour / M. Eremenko / K. Miyazaki / C. Boonne / H. Tanimoto / H. Akimoto

Atmospheric Chemistry and Physics, Vol 23, Pp 7399-

2023 Volume 7423

Abstract: We examine the impact of different sources of ozone precursors on the daily evolution of successive ozone pollution outbreaks across Europe in July 2017 by using a multispectral satellite approach called IASI + GOME2 and a tropospheric chemistry ... ...

Abstract	We examine the impact of different sources of ozone precursors on the daily evolution of successive ozone pollution outbreaks across Europe in July 2017 by using a multispectral satellite approach called IASI + GOME2 and a tropospheric chemistry reanalysis named TCR-2. IASI + GOME2, combining IASI (Infrared Atmospheric Sounding Interferometer) and GOME-2 (Global Ozone Monitoring Experiment-2) measurements respectively in the infrared and the ultraviolet, allows the observation of the daily horizontal distribution of ozone in the lowermost troposphere (defined here as the atmospheric layer between the surface and 3 km above sea level). IASI + GOME2 observations show a fair capacity to depict near-surface ozone evolution as compared to surface measurements from 188 European stations for the period 15–27 July 2017. At the beginning of this event (on 16 July), an ozone outbreak is initially formed over the Iberian Peninsula likely linked with high temperature-induced enhancements of biogenic volatile organic compound concentrations and collocated anthropogenic emissions. In the following days, the ozone plume splits into two branches, one being transported eastward across the western Mediterranean and Italy and the other one over western and Central Europe. The southern branch encounters ozone precursors emitted over the Balkan Peninsula by wildfires along the coast of the Adriatic Sea and biogenic sources in the inland region of the peninsula. Ozone concentrations of the northern plume are enhanced by photochemical production associated with anthropogenic sources of ozone precursors over Central Europe and by mixing with an ozone plume arriving from the North Sea that was originally produced over North America. Finally, both ozone branches are transported eastwards and mix gradually as they reach the northern coast of the Black Sea. There, emissions from agricultural fires after harvesting clearly favour photochemical production of ozone within the pollution plume, which is advected eastwards in the following days. ...
Keywords	Physics ; QC1-999 ; Chemistry ; QD1-999
Subject code	290
Language	English
Publishing date	2023-07-01T00:00:00Z
Publisher	Copernicus Publications
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: THEORETICAL BASES OF MANAGEMENT OF ADAPTATION OF INNOVATIVE PROCESSES AT THE ENTERPRISE OF MECHANICAL ENGINEERING

M. Shtrikunova / D. Pelikhov / M. Eremenko

Вестник университета, Vol 0, Iss 2, Pp 199-

2019 Volume 201

Abstract: Conceptual bases of management of adaptation of innovative processes at the enterprises of mechanical engineering which feature is consideration of management of adaptation of innovative processes in as counter process of adaptation of innovative ... ...

Abstract	Conceptual bases of management of adaptation of innovative processes at the enterprises of mechanical engineering which feature is consideration of management of adaptation of innovative processes in as counter process of adaptation of innovative solutions and processes to conditions of activity of the enterprise, on the one hand, and the adaptation of the enterprise to various changes with use of innovations, with another are defined. This approach allows to improve methods of management of innovative processes by continuous fine tuning under changes of external influences and change of the internal environment.
Keywords	инновационная деятельность ; адаптация инновационных процессов ; методы управления инновационной деятельностью ; Sociology (General) ; HM401-1281 ; Economics as a science ; HB71-74
Language	Russian
Publishing date	2019-02-01T00:00:00Z
Publisher	Publishing House of the State University of Management
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Ozone pollution during the COVID-19 lockdown in the spring of 2020 over Europe, analysed from satellite observations, in situ measurements, and models

J. Cuesta / L. Costantino / M. Beekmann / G. Siour / L. Menut / B. Bessagnet / T. C. Landi / G. Dufour / M. Eremenko

Atmospheric Chemistry and Physics, Vol 22, Pp 4471-

2022 Volume 4489

Abstract: We present a comprehensive study integrating satellite observations of ozone pollution, in situ measurements, and chemistry-transport model simulations for quantifying the role of anthropogenic emission reductions during the COVID-19 lockdown in spring ... ...

Abstract	We present a comprehensive study integrating satellite observations of ozone pollution, in situ measurements, and chemistry-transport model simulations for quantifying the role of anthropogenic emission reductions during the COVID-19 lockdown in spring 2020 over Europe. Satellite observations are derived from the IASI + GOME2 (Infrared Atmospheric Sounding Interferometer + Global Ozone Monitoring Experiment 2) multispectral synergism, which provides better sensitivity to near-surface ozone pollution. These observations are mainly analysed in terms of differences between the average on 1–15 April 2020, when the strictest lockdown restrictions took place, and the same period in 2019. They show clear enhancements of near-surface ozone in central Europe and northern Italy, as well as some other hotspots, which are typically characterized by volatile organic compound (VOC)-limited chemical regimes. An overall reduction of ozone is observed elsewhere, where ozone chemistry is limited by the abundance of NO x . The spatial distribution of positive and negative ozone concentration anomalies observed from space is in relatively good quantitative agreement with surface in situ measurements over the continent (a correlation coefficient of 0.55, a root-mean-squared difference of 11 ppb , and the same standard deviation and range of variability). An average difference of ∼ 8 ppb between the two observational datasets is observed, which can partly be explained by the fact the satellite approach retrieves partial columns of ozone with a peak sensitivity above the surface (near 2 km of altitude over land and averaging kernels reaching the middle troposphere over ocean). For assessing the impact of the reduction of anthropogenic emissions during the lockdown, we adjust the satellite and in situ surface observations for subtracting the influence of meteorological conditions in 2020 and 2019. This adjustment is derived from the chemistry-transport model simulations using the meteorological fields of each year and identical ...
Keywords	Physics ; QC1-999 ; Chemistry ; QD1-999
Subject code	551
Language	English
Publishing date	2022-04-01T00:00:00Z
Publisher	Copernicus Publications
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Independent Control Over Size and Surface Density of Droplet Epitaxial Nanostructures Using Ultra-Low Arsenic Fluxes

Sergey V. Balakirev / Natalia E. Chernenko / Mikhail M. Eremenko / Oleg A. Ageev / Maxim S. Solodovnik

Nanomaterials, Vol 11, Iss 1184, p

2021 Volume 1184

Abstract: Modern and future nanoelectronic and nanophotonic applications require precise control of the size, shape and density of III-V quantum dots in order to predefine the characteristics of devices based on them. In this paper, we propose a new approach to ... ...

Abstract	Modern and future nanoelectronic and nanophotonic applications require precise control of the size, shape and density of III-V quantum dots in order to predefine the characteristics of devices based on them. In this paper, we propose a new approach to control the size of nanostructures formed by droplet epitaxy. We reveal that it is possible to reduce the droplet volume independently of the growth temperature and deposition amount by exposing droplets to ultra-low group-V flux. We carry out a thorough study of the effect of arsenic pressure on the droplet characteristics and demonstrate that indium droplets with a large initial size (>100 nm) and a low surface density (<10 8 cm −2 ) are able to shrink to dimensions appropriate for quantum dot applications. Small droplets are found to be unstable and difficult to control, while larger droplets are more resistive to arsenic flux and can be reduced to stable, small-sized nanostructures (~30 nm). We demonstrate the growth conditions under which droplets transform into dots, ring and holes and describe a mechanism of this transformation depending on the ultra-low arsenic flux. Thus, we observe phenomena which significantly expand the capabilities of droplet epitaxy.
Keywords	droplet epitaxy ; nanostructures ; indium ; gallium arsenide ; arsenic flux ; Chemistry ; QD1-999
Subject code	600
Language	English
Publishing date	2021-04-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: THEORETICAL BASES OF MANAGEMENT OF ADAPTATION OF INNOVATIVE PROCESSES AT THE ENTERPRISE OF MECHANICAL ENGINEERING

M. Shtrikunova / D. Pelikhov / M. Eremenko

Вестник университета, Vol 0, Iss 2, Pp 199-

2016 Volume 201

Abstract	Conceptual bases of management of adaptation of innovative processes at the enterprises of mechanical engineering which feature is consideration of management of adaptation of innovative processes in as counter process of adaptation of innovative solutions and processes to conditions of activity of the enterprise, on the one hand, and the adaptation of the enterprise to various changes with use of innovations, with another are defined. This approach allows to improve methods of management of innovative processes by continuous fine tuning under changes of external influences and change of the internal environment.
Keywords	инновационная деятельность ; адаптация инновационных процессов ; методы управления инновационной деятельностью ; Sociology (General) ; HM401-1281 ; Economics as a science ; HB71-74
Language	English
Publishing date	2016-02-01T00:00:00Z
Publisher	Publishing House of the State University of Management
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: A study of the influence of tropospheric subsidence on spring and summer surface ozone concentrations at the JRC Ispra station in northern Italy

P. Kalabokas / N. R. Jensen / M. Roveri / J. Hjorth / M. Eremenko / J. Cuesta / G. Dufour / G. Foret / M. Beekmann

Atmospheric Chemistry and Physics, Vol 20, Pp 1861-

2020 Volume 1885

Abstract: The influence of tropospheric ozone on the surface ozone concentrations is investigated at the monitoring station of JRC Ispra, based on 10 years of measurements (2006–2015) of surface ozone data. In situ hourly measurements of ozone and other air ... ...

Abstract	The influence of tropospheric ozone on the surface ozone concentrations is investigated at the monitoring station of JRC Ispra, based on 10 years of measurements (2006–2015) of surface ozone data. In situ hourly measurements of ozone and other air pollutants, meteorological parameters, and weekly averaged 7 Be (as an indicator of upper-tropospheric–stratospheric influence) and 210 Pb measurements (as an indicator of boundary layer influence) have been used for the analysis. In addition, IASI + GOME-2 and IASI ozone satellite data have also been used. It is observed that frequently 7 Be and ozone weekly peaks coincide, which might be explained by the impact of deep atmospheric subsidence on surface ozone, particularly during late spring and early summer. Based on this observation, a detailed analysis of selected 7 Be and ozone episodes occurring during that period of the year has been performed in order to further elucidate the mechanisms of tropospheric influence on the surface pollutant concentrations. For the analysis, composite NOAA/ESRL reanalysis synoptic meteorological charts in the troposphere have been used as well as IASI satellite ozone measurements and NOAA HYSPLIT back trajectories. The JRC station hourly measurements during subsidence episodes show very low values of local pollution parameters (e.g., NO x , 222 Rn, nephelometer data, PM 10 ), close to zero. Conversely, during these periods ozone levels usually reach values around 45–60 ppb during the afternoon hours but also show significantly higher values than the average during the night and morning hours, which is a sign of direct tropospheric influence on the surface ozone concentrations.
Keywords	Physics ; QC1-999 ; Chemistry ; QD1-999
Subject code	333 ; 290
Language	English
Publishing date	2020-02-01T00:00:00Z
Publisher	Copernicus Publications
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Local atomic order and hierarchical polar nanoregions in a classical relaxor ferroelectric

M. Eremenko / V. Krayzman / A. Bosak / H. Y. Playford / K. W. Chapman / J. C. Woicik / B. Ravel / I. Levin

Nature Communications, Vol 10, Iss 1, Pp 1-

2019 Volume 9

Abstract: The understanding of relaxor ferroelectrics is hindered by the complexity of nanoscale perturbations of their structure. Here, a data set of independent techniques treated on common footing provides a multiscale description of atomic order which ... ...

Abstract	The understanding of relaxor ferroelectrics is hindered by the complexity of nanoscale perturbations of their structure. Here, a data set of independent techniques treated on common footing provides a multiscale description of atomic order which reconciles conflicting models derived from single methods.
Keywords	Science ; Q
Language	English
Publishing date	2019-06-01T00:00:00Z
Publisher	Nature Portfolio
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Local atomic order and hierarchical polar nanoregions in a classical relaxor ferroelectric

M. Eremenko / V. Krayzman / A. Bosak / H. Y. Playford / K. W. Chapman / J. C. Woicik / B. Ravel / I. Levin

Nature Communications, Vol 10, Iss 1, Pp 1-

2019 Volume 9

Abstract	The understanding of relaxor ferroelectrics is hindered by the complexity of nanoscale perturbations of their structure. Here, a data set of independent techniques treated on common footing provides a multiscale description of atomic order which reconciles conflicting models derived from single methods.
Keywords	Science ; Q
Language	English
Publishing date	2019-06-01T00:00:00Z
Publisher	Nature Publishing Group
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Stratospheric aerosol layer perturbation caused by the 2019 Raikoke and Ulawun eruptions and their radiative forcing

C. Kloss / G. Berthet / P. Sellitto / F. Ploeger / G. Taha / M. Tidiga / M. Eremenko / A. Bossolasco / F. Jégou / J.-B. Renard / B. Legras

Atmospheric Chemistry and Physics, Vol 21, Pp 535-

2021 Volume 560

Abstract: In June 2019 a stratospheric eruption occurred at Raikoke (48 ∘ N, 153 ∘ E). Satellite observations show the injection of ash and SO 2 into the lower stratosphere and an early entrainment of the plume into a cyclone. Following the Raikoke eruption, ... ...

Abstract	In June 2019 a stratospheric eruption occurred at Raikoke (48 ∘ N, 153 ∘ E). Satellite observations show the injection of ash and SO 2 into the lower stratosphere and an early entrainment of the plume into a cyclone. Following the Raikoke eruption, stratospheric aerosol optical depth (sAOD) values increased in the whole Northern Hemisphere and tropics and remained enhanced for more than 1 year, with peak values at 0.040 (short-wavelength, high northern latitudes) to 0.025 (short-wavelength, Northern Hemisphere average). Discrepancies between observations and global model simulations indicate that ash may have influenced the extent and evolution of the sAOD. Top of the atmosphere radiative forcings are estimated at values between −0.3 and <math xmlns="http://www.w3.org/1998/Math/MathML" id="M5" display="inline" overflow="scroll" dspmath="mathml"><mrow><mo>-</mo><mn mathvariant="normal">0.4</mn><mspace width="0.125em" linebreak="nobreak"/><mrow class="unit"><mi mathvariant="normal">W</mi><mspace linebreak="nobreak" width="0.125em"/><msup><mi mathvariant="normal">m</mi><mrow><mo>-</mo><mn mathvariant="normal">2</mn></mrow></msup></mrow></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="57pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="b319be068d47d4cc962731f0488db2a0"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="acp-21-535-2021-ie00001.svg" width="57pt" height="14pt" src="acp-21-535-2021-ie00001.png"/></svg:svg> (clear-sky) and of −0.1 to <math xmlns="http://www.w3.org/1998/Math/MathML" id="M7" display="inline" overflow="scroll" dspmath="mathml"><mrow><mo>-</mo><mn mathvariant="normal">0.2</mn><mspace linebreak="nobreak" width="0.125em"/><mrow class="unit"><mi mathvariant="normal">W</mi><mspace linebreak="nobreak" ...<br />
Keywords	Physics ; QC1-999 ; Chemistry ; QD1-999
Subject code	333 ; 511
Language	English
Publishing date	2021-01-01T00:00:00Z
Publisher	Copernicus Publications
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Recent ozone trends in the Chinese free troposphere

G. Dufour / D. Hauglustaine / Y. Zhang / M. Eremenko / Y. Cohen / A. Gaudel / G. Siour / M. Lachatre / A. Bense / B. Bessagnet / J. Cuesta / J. Ziemke / V. Thouret / B. Zheng

Atmospheric Chemistry and Physics, Vol 21, Pp 16001-

role of the local emission reductions and meteorology

2021 Volume 16025

Abstract: Free tropospheric ozone ( O 3 ) trends in the Central East China (CEC) and export regions are investigated for 2008–2017 using the IASI (Infrared Atmospheric Sounding Interferometer) O 3 observations and the LMDZ-OR-INCA model simulations, including the ... ...

Abstract	Free tropospheric ozone ( O 3 ) trends in the Central East China (CEC) and export regions are investigated for 2008–2017 using the IASI (Infrared Atmospheric Sounding Interferometer) O 3 observations and the LMDZ-OR-INCA model simulations, including the most recent Chinese emission inventory. The observed and modelled trends in the CEC region are − 0.07 ± 0.02 and − 0.08 ± 0.02 DU yr −1 , respectively, for the lower free troposphere (3–6 km column) and − 0.05 ± 0.02 and − 0.06 ± 0.02 DU yr −1 , respectively, for the upper free troposphere (6–9 km column). The statistical p value is smaller to 0.01 for all the derived trends. A good agreement between the observations and the model is also observed in the region, including the Korean Peninsula and Japan and corresponding to the region of pollution export from China. Based on sensitivity studies conducted with the model, we evaluate, at 60 % and 52 %, the contribution of the Chinese anthropogenic emissions to the trend in the lower and upper free troposphere, respectively. The second main contribution to the trend is the meteorological variability (34 % and 50 %, respectively). These results suggest that the reduction in NO x anthropogenic emissions that has occurred since 2013 in China led to a decrease in ozone in the Chinese free troposphere, contrary to the increase in ozone at the surface. We designed some tests to compare the trends derived by the IASI observations and the model to independent measurements, such as the In-service Aircraft for a Global Observing System (IAGOS) or other satellite measurements (Ozone Monitoring Instrument (OMI)/Microwave Limb Sounder (MLS)). These comparisons do not confirm the O 3 decrease and stress the difficulty in analysing short-term trends using multiple data sets with various sampling and the risk of overinterpreting the results.
Keywords	Physics ; QC1-999 ; Chemistry ; QD1-999
Subject code	511
Language	English
Publishing date	2021-10-01T00:00:00Z
Publisher	Copernicus Publications
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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