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Papers by Alexander Lukyanov

Research paper thumbnail of Simulation of CO2 concentrations using coupled (Eulerian/Lagrangian) model with global high resolution (1km x 1km) surface fluxes

Research paper thumbnail of A Novel Approach to Estimation of Time-Variable Surface Sources and Sinks of Carbon Dioxide Using Empirical Orthogonal Functions and the Kalman Filter

It is well known that greenhouse gases and, in particular, greenhouse gases of anthropogenic orig... more It is well known that greenhouse gases and, in particular, greenhouse gases of anthropogenic origin, influence the Earth climate to a great extend. Accurate estimates of strengths, and spatial and time variability of the surface sources and sinks of greenhouse gases are thus of great interest to both the scientific community and the policy makers. Carbon dioxide, (CO2), is the most important greenhouse gas of anthropogenic origin that affects radiative balance of the atmosphere and, eventually, the climate. Observations of CO2 concentrations in the atmosphere demonstrated short-time variability and spatial patterns reflecting influence of time-variable regional sources and sinks. The objective of this study is to estimate absolute contributions of various geographical regions to the total carbon dioxide budget at relatively short time scales and in a computationally efficient manner. A traditional approach to this problem includes dividing the Earth's surface by a number of non...

Research paper thumbnail of Stratospheric water vapour in the vicinity of the Arctic polar vortex

Annales Geophysicae, 2006

The stratospheric water vapour mixing ratio inside, outside, and at the edge of the polar vortex ... more The stratospheric water vapour mixing ratio inside, outside, and at the edge of the polar vortex has been accurately measured by the FLASH-B Lyman-Alpha hygrometer during the LAUTLOS campaign in Sodankylä, Finland, in January and February 2004. The retrieved H 2 O profiles reveal a detailed view on the Arctic lower stratospheric water vapour distribution, and provide a valuable dataset for the validation of model and satellite data. Analysing the measurements with the semi-lagrangian advection model MI-MOSA, water vapour profiles typical for the polar vortex' interior and exterior have been identified, and laminae in the observed profiles have been correlated to filamentary structures in the potential vorticity field. Applying the validated MIMOSA transport scheme to specific humidity fields from operational ECMWF analyses, large discrepancies from the observed profiles arise. Although MIMOSA is able to reproduce weak water vapour filaments and improves the shape of the profiles compared to operational ECMWF analyses, both models reveal a dry bias of about 1 ppmv in the lower stratosphere above 400 K, accounting for a relative difference from the measurements in the order of 20%. The large dry bias in the analysis representation of stratospheric water vapour in the Arctic implies the need for future regular measurements of water vapour in the polar stratosphere to allow the validation and improvement of climate models.

Research paper thumbnail of ECInvestigation of NO2 Pollutions on Board of Research Aircraft (Some Results of QUANTIFY and POLARCAT Field Campaigns)

DLR Deutsches Zentrum fur Luft- und Raumfahrt e.V. - Forschungsberichte

The results of investigation of NO2 pollutions on board of research aircraft Falcon (DLR, Germany... more The results of investigation of NO2 pollutions on board of research aircraft Falcon (DLR, Germany) are presented. The measurements have been carried out by chemiluminescent nitrogen dioxide analyzer developed in Central Aerological Observatory (Russia). The data of NO2 distribution have been obtained during QUANTIFY (West Europe, July 2007) and POLARCAT (Greenland, July 2008) field campaigns. NO2 measurements over Greenland during POLARCAT field campaign have been carried out using ACCENT support. Different sources of nitrogen oxides are investigated. Some aspects of nitrogen dioxide distribution and transport are considered. Chemical transformation of nitrogen oxides inside ship plumes is observed and analyzed.

Research paper thumbnail of Versatile Object-Oriented Toolkit for Coarse-Graining Applications

Journal of Chemical Theory and Computation, 2009

Research paper thumbnail of The water vapour distribution in the Arctic lowermost stratosphere during the LAUTLOS campaign and related transport processes including stratosphere-troposphere exchange

Atmospheric Chemistry and Physics, 2007

Research paper thumbnail of A global coupled Eulerian-Lagrangian model and 1 × 1 km CO<sub>2</sub> surface flux dataset for high-resolution atmospheric CO<sub>2</sub> transport simulations

Geoscientific Model Development, 2012

We designed a method to simulate atmospheric CO 2 concentrations at several continuous observatio... more We designed a method to simulate atmospheric CO 2 concentrations at several continuous observation sites around the globe using surface fluxes at a very high spatial resolution. The simulations presented in this study were performed using the Global Eulerian-Lagrangian Coupled Atmospheric model (GELCA), comprising a Lagrangian particle dispersion model coupled to a global atmospheric tracer transport model with prescribed global surface CO 2 flux maps at a 1 × 1 km resolution. The surface fluxes used in the simulations were prepared by assembling the individual components of terrestrial, oceanic and fossil fuel CO 2 fluxes. This experimental setup (i.e. a transport model running at a medium resolution, coupled to a high-resolution Lagrangian particle dispersion model together with global surface fluxes at a very high resolution), which was designed to represent high-frequency variations in atmospheric CO 2 concentration, has not been reported at a global scale previously. Two sensitivity experiments were performed: (a) using the global transport model without coupling to the Lagrangian dispersion model, and (b) using the coupled model with a reduced resolution of surface fluxes, in order to evaluate the performance of Eulerian-Lagrangian coupling and the role of high-resolution fluxes in simulating high-frequency variations in atmospheric CO 2 concentrations. A correlation analysis between observed and simulated atmospheric CO 2 concentrations at selected locations revealed that the inclusion of both Eulerian-Lagrangian coupling and highresolution fluxes improves the high-frequency simulations of the model. The results highlight the potential of a coupled Eulerian-Lagrangian model in simulating high-frequency atmospheric CO 2 concentrations at many locations worldwide. The model performs well in representing observations of atmospheric CO 2 concentrations at high spatial and temporal resolutions, especially for coastal sites and sites located close to sources of large anthropogenic emissions. While this study focused on simulations of CO 2 concentrations, the model could be used for other atmospheric compounds with known estimated emissions.

Research paper thumbnail of Simulation of CO2 concentrations using coupled (Eulerian/Lagrangian) model with global high resolution (1km x 1km) surface fluxes

Research paper thumbnail of A Novel Approach to Estimation of Time-Variable Surface Sources and Sinks of Carbon Dioxide Using Empirical Orthogonal Functions and the Kalman Filter

It is well known that greenhouse gases and, in particular, greenhouse gases of anthropogenic orig... more It is well known that greenhouse gases and, in particular, greenhouse gases of anthropogenic origin, influence the Earth climate to a great extend. Accurate estimates of strengths, and spatial and time variability of the surface sources and sinks of greenhouse gases are thus of great interest to both the scientific community and the policy makers. Carbon dioxide, (CO2), is the most important greenhouse gas of anthropogenic origin that affects radiative balance of the atmosphere and, eventually, the climate. Observations of CO2 concentrations in the atmosphere demonstrated short-time variability and spatial patterns reflecting influence of time-variable regional sources and sinks. The objective of this study is to estimate absolute contributions of various geographical regions to the total carbon dioxide budget at relatively short time scales and in a computationally efficient manner. A traditional approach to this problem includes dividing the Earth's surface by a number of non...

Research paper thumbnail of Stratospheric water vapour in the vicinity of the Arctic polar vortex

Annales Geophysicae, 2006

The stratospheric water vapour mixing ratio inside, outside, and at the edge of the polar vortex ... more The stratospheric water vapour mixing ratio inside, outside, and at the edge of the polar vortex has been accurately measured by the FLASH-B Lyman-Alpha hygrometer during the LAUTLOS campaign in Sodankylä, Finland, in January and February 2004. The retrieved H 2 O profiles reveal a detailed view on the Arctic lower stratospheric water vapour distribution, and provide a valuable dataset for the validation of model and satellite data. Analysing the measurements with the semi-lagrangian advection model MI-MOSA, water vapour profiles typical for the polar vortex' interior and exterior have been identified, and laminae in the observed profiles have been correlated to filamentary structures in the potential vorticity field. Applying the validated MIMOSA transport scheme to specific humidity fields from operational ECMWF analyses, large discrepancies from the observed profiles arise. Although MIMOSA is able to reproduce weak water vapour filaments and improves the shape of the profiles compared to operational ECMWF analyses, both models reveal a dry bias of about 1 ppmv in the lower stratosphere above 400 K, accounting for a relative difference from the measurements in the order of 20%. The large dry bias in the analysis representation of stratospheric water vapour in the Arctic implies the need for future regular measurements of water vapour in the polar stratosphere to allow the validation and improvement of climate models.

Research paper thumbnail of ECInvestigation of NO2 Pollutions on Board of Research Aircraft (Some Results of QUANTIFY and POLARCAT Field Campaigns)

DLR Deutsches Zentrum fur Luft- und Raumfahrt e.V. - Forschungsberichte

The results of investigation of NO2 pollutions on board of research aircraft Falcon (DLR, Germany... more The results of investigation of NO2 pollutions on board of research aircraft Falcon (DLR, Germany) are presented. The measurements have been carried out by chemiluminescent nitrogen dioxide analyzer developed in Central Aerological Observatory (Russia). The data of NO2 distribution have been obtained during QUANTIFY (West Europe, July 2007) and POLARCAT (Greenland, July 2008) field campaigns. NO2 measurements over Greenland during POLARCAT field campaign have been carried out using ACCENT support. Different sources of nitrogen oxides are investigated. Some aspects of nitrogen dioxide distribution and transport are considered. Chemical transformation of nitrogen oxides inside ship plumes is observed and analyzed.

Research paper thumbnail of Versatile Object-Oriented Toolkit for Coarse-Graining Applications

Journal of Chemical Theory and Computation, 2009

Research paper thumbnail of The water vapour distribution in the Arctic lowermost stratosphere during the LAUTLOS campaign and related transport processes including stratosphere-troposphere exchange

Atmospheric Chemistry and Physics, 2007

Research paper thumbnail of A global coupled Eulerian-Lagrangian model and 1 × 1 km CO<sub>2</sub> surface flux dataset for high-resolution atmospheric CO<sub>2</sub> transport simulations

Geoscientific Model Development, 2012

We designed a method to simulate atmospheric CO 2 concentrations at several continuous observatio... more We designed a method to simulate atmospheric CO 2 concentrations at several continuous observation sites around the globe using surface fluxes at a very high spatial resolution. The simulations presented in this study were performed using the Global Eulerian-Lagrangian Coupled Atmospheric model (GELCA), comprising a Lagrangian particle dispersion model coupled to a global atmospheric tracer transport model with prescribed global surface CO 2 flux maps at a 1 × 1 km resolution. The surface fluxes used in the simulations were prepared by assembling the individual components of terrestrial, oceanic and fossil fuel CO 2 fluxes. This experimental setup (i.e. a transport model running at a medium resolution, coupled to a high-resolution Lagrangian particle dispersion model together with global surface fluxes at a very high resolution), which was designed to represent high-frequency variations in atmospheric CO 2 concentration, has not been reported at a global scale previously. Two sensitivity experiments were performed: (a) using the global transport model without coupling to the Lagrangian dispersion model, and (b) using the coupled model with a reduced resolution of surface fluxes, in order to evaluate the performance of Eulerian-Lagrangian coupling and the role of high-resolution fluxes in simulating high-frequency variations in atmospheric CO 2 concentrations. A correlation analysis between observed and simulated atmospheric CO 2 concentrations at selected locations revealed that the inclusion of both Eulerian-Lagrangian coupling and highresolution fluxes improves the high-frequency simulations of the model. The results highlight the potential of a coupled Eulerian-Lagrangian model in simulating high-frequency atmospheric CO 2 concentrations at many locations worldwide. The model performs well in representing observations of atmospheric CO 2 concentrations at high spatial and temporal resolutions, especially for coastal sites and sites located close to sources of large anthropogenic emissions. While this study focused on simulations of CO 2 concentrations, the model could be used for other atmospheric compounds with known estimated emissions.