About
59
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1,641
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Citations since 2017
Introduction
Atmosphere, chemistry, climate, isotopes, modelling, HPC, data mining.
Additional affiliations
April 2014 - present
Yu. A. Izrael Institute of Global Climate and Ecology
Position
- Research Associate
Description
- Overseeing of the scientific modelling activities - climate modelling, regional and global pollution transfer modelling, atmospheric chemistry modelling with AC-GCMs. Supervisor of the computing cluster.
April 2009 - April 2010
Position
- Student Tutoring, Theoretical Meteorology-I,II
Description
- Supervising and conducting the computer laboratory practice, students tutoring, grading of the seminar and examination work (accomp. Prof. Dr. M. Lawrence).
October 2008 - April 2009
Position
- Student Tutoring, Experimental and Particle Physics
Description
- Conducting seminars on the subject, grading of the seminar and examination work (accompanying Prof. Dr. Heinz-Georg Sander, http://www.etap.physik.uni-mainz.de/).
Education
February 2008 - October 2013
Field of study
- Atmospheric Physics and Chemistry, Isotope Chemistry
September 2000 - January 2006
Publications
Publications (59)
An issue of O3-driven artefact production of O3 in the upper
troposphere/lowermost stratosphere (UT/LMS) air analysed in the CARIBIC-1
project is being discussed. By confronting the CO mixing and isotope ratios
obtained from different analytical instrumentation, we (i) reject
natural/artificial sampling and mixing effects as possible culprits of th...
The hydroxyl radical is a key oxidant in the Earth's atmosphere. This
short-lived highly reactive molecule plays an important role in the
degradation of volatile organic compounds, leading to the production of
ozone and the formation and growth of aerosol particles. In this way,
hydroxyl radicals influence air quality and regional climate.
Measurem...
Isotope composition, in many cases, holds unique
information on the sources, chemical modification and sinks
of atmospheric trace gases. Vital to the interpretation
and use of an increasing number of isotope analyses is
appropriate modelling. However, the exact implementation
of isotopic information in chemistry-climate models is
a challenge, and o...
Ice core and marine archives provide detailed quantitative records of last glacial climate changes, whereas comparable terrestrial records from the mid-latitudes remain scarce. Here we quantify warm season land-surface temperatures and precipitation over millennial timescales for central Europe for the period spanning 45,000–22,000 years before pre...
Atmospheric methane (CH4) has changed considerably in the time between the last glacial maximum (LGM) and the preindustrial period (PI). We investigate these changes in transient experiments with an Earth System Model, focusing on the rapid changes during the deglaciation, especially pronounced in the Bølling Allerød (BA) and Younger Dryas (YD) per...
It has long been hypothesized that the last glacial maximum (LGM) oversaw cold, arid, windy climates across southern Australia, and that these were driven by intensification and northward expansion of mid-latitude westerly circulation. Moreover, it was recently suggested that Australia experienced an extended LGM which began several millennia befor...
The atmospheric oxidation of biogenic volatile organic compounds (BVOC) by OH radicals over tropical rainforests impacts local particle production and the lifetime of globally distributed harmful and radiatively active gases. For the pristine Amazon rainforest during the dry season, we empirically determined the diurnal OH radical variability at th...
An updated and expanded representation of organics in the chemistry general circulation model EMAC
(ECHAM5/MESSy for Atmospheric Chemistry) has been evaluated. First, the
comprehensive Mainz Organic Mechanism (MOM)
in the submodel MECCA (Module Efficiently Calculating the Chemistry of the Atmosphere) was activated with
explicit degradation of organ...
The climate of the last 50,000 years has been punctuated by oscillations on millennial-to-centennial timescales. Our understanding of this variability derives predominantly from proxy information in ice and marine cores; high-resolution records from land are scarce. Here we quantify land-surface temperature and soil moisture at millennial timescale...
The Tibetan Plateau (TP) is a vast elevated and clean region in Asia. However, with increasing emissions and air pollution in surrounding areas, the atmosphere over the TP is getting affected. In this chapter, ozone and aerosols over the TP are studied with the aim to understand (1) the regional and seasonal variations in surface ozone and black ca...
An application of radiocarbon ( ¹⁴ C) in atmospheric chemistry is reviewed. ¹⁴ C produced by cosmic neutrons immediately forms ¹⁴ CO, which reacts with hydroxyl radicals (OH) to ¹⁴ CO 2 . By this the distribution and seasonality (the lifetime of ¹⁴ CO is ∼1 month) of the pivotal atmospheric oxidant OH can be established. ¹⁴ CO measurement is a comp...
Methane (CH4) is the second most important naturally occurring greenhouse gas (GHG) after carbon dioxide (Myhre G et al 2013 Climate Change 2013: The Physical Science Basis. Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (Cambridge: Cambridge University Press) pp 659-740). For both GH...
Atmospheric acidity is increasingly determined by carbon dioxide and organic acids 1–3 . Among the latter, formic acid facilitates the nucleation of cloud droplets ⁴ and contributes to the acidity of clouds and rainwater 1,5 . At present, chemistry–climate models greatly underestimate the atmospheric burden of formic acid, because key processes rel...
Aromatics contribute a significant fraction to organic compounds in the troposphere and are mainly emitted by anthropogenic activities and biomass burning. Their oxidation in lab experiments is known to lead to the formation of ozone and aerosol precursors. However, their overall impact on tropospheric composition is uncertain as it depends on tran...
In urban areas, road traffic is a dominant source of nitrogen oxides (NOx=NO+NO2). Although the emissions from individual vehicles are regulated by the European emission standards, real driving emissions often exceed these limits. In this study, two multi-axis differential optical absorption spectroscopy (MAX-DOAS) instruments on opposite sides of...
In urban areas, road traffic is a dominant source of nitrogen oxides (NOx = NO + NO2). Although the emissions from individual vehicles are regulated by the European emission standards, real driving emissions often exceed these limits. In this study, two MAX-DOAS instruments on opposite sides of the motorway were used to measure the NO2 absorption c...
Aromatics contribute a significant fraction to organic compounds in the troposphere and are mainly emitted by anthropogenic activities and biomass burning. Their oxidation in lab experiments is known to lead to the formation of ozone and aerosol precursors. However, their overall impact on tropospheric composition is uncertain as it depends on tran...
The triple oxygen isotope signature Δ17O in atmospheric CO2, also known as its “17O excess,” has been proposed as a tracer for gross primary production (the gross uptake of CO2 by vegetation through photosynthesis). We present the first global 3‐D model simulations for Δ17O in atmospheric CO2 together with a detailed model description and sensitivi...
Corrigendum to "Stable isotope composition of atmospheric carbon monoxide: A modelling study".
Atmospheric temperature and ozone photochemistry are recognised to play dominant roles in setting the abundance of 18O18O isotopologues (expressed via Δ36) of atmospheric oxygen. Here, we use the AC-GCM EMAC to simulate the abundance of atmospheric 18O18O in a most consistent to date kinetic chemistry modelling framework.
Extensive model diagnosti...
We present version 4.0 of the atmospheric chemistry box model CAABA/MECCA that now includes a number of new features: (i) skeletal mechanism reduction, (ii) the Mainz Organic Mechanism (MOM) chemical mechanism for volatile organic compounds, (iii) an option to include reactions from the Master Chemical Mechanism (MCM) and other chemical mechanisms,...
p>The triple oxygen isotope signature Δ<sup>17</sup>O in atmospheric CO<sub>2</sub>, also known as its “<sup>17</sup>O excess,” has been proposed as a tracer for gross primary production (the gross uptake of CO<sub>2</sub> by vegetation through photosynthesis). We present the first global 3-D model simulations for Δ<sup>17</sup>O in atmospheric CO<...
We present version 4.0gmdd of the atmospheric chemistry box model CAABA/MECCA which now includes a number of new features: (i) skeletal mechanism reduction, (ii) the MOM chemical mechanism for volatile organic compounds, (iii) an option to include reactions from the Master Chemical Mechanism (MCM) and other chemical mechanisms, (iv) updated isotope...
An important driver of climate change is stratospheric water vapor (SWV), which in turn is influenced by the oxidation of atmospheric methane (CH4). In order to parameterize the production of water vapor (H2O) from CH4 oxidation, it is often assumed that the oxidation of one CH4 molecule yields exactly two molecules of H2O. However, this assumption...
An important driver of climate change is stratospheric water vapor (SWV), which in turn is influenced by the oxidation of atmospheric methane (CH4). In order to parameterize the production of water vapor (H2O) from CH4 oxidation, it is often assumed that the oxidation of one CH4 molecule yields exactly two molecules of H2O. However, this assumption...
Unexpectedly large seasonal phase differences between CH4
concentration and its 13C ∕ 12C isotopic ratio and
their inter-annual variations observed in southern hemispheric time series
have been attributed to the Cl + CH4 reaction, in which
13CH4 is discriminated strongly compared to OH + CH4,
and have provided the only (indirect) evidence of a hemi...
Using the comprehensive AC-GCM EMAC, we review the factors controlling atmospheric oxidative capacity and CH4 lifetime during the Last Glacial Maximum (LGM). We find that atmospheric reactivity is well buffered by merely one player − lighting NOx => LGM CH4 lifetimes are similar to Present-Day ones. We provide a simplified framework for estimating...
An important driver of climate change is stratospheric water vapour (SWV), which in turn is influenced by the oxidation of atmospheric methane (CH4). In order to parameterize the production of water vapour (H2O) from CH4 oxidation, it is often assumed that the oxidation of one CH4 molecule yields exactly two molecules of H2O. However, this assumpti...
Unexpectedly large seasonal phase differences between CH4 concentration and its ¹³C/¹²C isotopic ratio and their inter-annual variations observed in southern hemispheric time series have been attributed to the Cl+CH4 reaction, in which ¹³CH4 is discriminated strongly compared to OH+CH4, and have provided the only and indirect evidence of a hemisphe...
During the summertime CYPHEX campaign (CYprus PHotochemical EXperiment 2014) in the eastern Mediterranean, multiple volatile organic compounds (VOCs) were measured from a 650 m hilltop site in western Cyprus (34° 57′ N/32° 23′ E). Periodic shifts in the northerly Etesian winds resulted in the site being alternately impacted by photochemically proce...
We provide a comprehensive review of the proxy data on the
13C ∕ 12C ratios and uncertainties of emissions of
reactive carbonaceous compounds into the atmosphere, with a focus on CO
sources. Based on an evaluated set-up of the EMAC model, we derive the
isotope-resolved data set of its emission inventory for the 1997–2005
period. Additionally, we re...
We provide the estimate of the fluxes and 13C/12C ratios of a suite of reactive carbonaceous compounds emitted into the atmosphere. The data are based on an evaluated set-up of the EMAC model (EVAL2, http://www.geosci-model-dev.net/3/717/2010/). Please refer to the cited publication for details.
Emission sources are integrated into the anthropoge...
We provide a comprehensive review of the proxy data on the ¹³C/¹²C ratios and uncertainties of emissions of reactive carbonaceous compounds into the atmosphere, with a focus on CO sources. Based on an evaluated setup of the EMAC model, we derive the isotope-resolved dataset of its emission inventory for the 1997–2005 period. Additionally, we revisi...
Near-surface concentrations of ozone over the Baikal region were assessed using ozone observations from GOME-2 instrument onboard the MetOp-A satellite. High resolution ozone profiles were provided by EUMETSAT. In order to verify near surface ozone concentrations obtained from satellite data, a comparison was performed with observations at ground s...
Airborne compounds containing sulphur and nitrogen play an important role in atmospheric chemistry. Being capable of absorbing solar radiation at different wavelengths, they are recognized to have a potential to influence the climate evolution on Earth. Current interest in studying these compounds arises due to their increased global input into the...
The self-cleaning or oxidation capacity of the atmosphere
is principally controlled by hydroxyl (OH) radicals in the troposphere.
Hydroxyl has primary (P) and secondary (S) sources, the
former mainly through the photodissociation of ozone, the latter through OH
recycling in radical reaction chains. We used the recent Mainz Organics
Mechanism (MOM)...
During the summertime CYPHEX campaign (CYprus PHotochemical EXperiment 2014) in the Eastern Mediterranean, multiple volatile organic compounds (VOCs) were measured from a 650 m hilltop site in western Cyprus (34°57' N/32°23' E). Periodic shifts in the northerly Etesian winds resulted in the site being alternately impacted by photochemically process...
The self-cleaning or oxidation capacity of the atmosphere is principally controlled by hydroxyl (OH) radicals in the troposphere. Hydroxyl has primary (P) and secondary (S) sources, the former through the photo-dissociation of ozone, the latter through OH recycling in radical reaction chains. We used the recent Mainz Organics Mechanism (MOM) to adv...
We present model experiments similar in design to that of Tans, implemented in the 3D AC-GCM model EMAC adapted for simulating methane isotope kinetic chemistry on decadal scale. We investigate atmospheric distributions of CH4 and its potential 2H/1H, 13C/12C and 14C isotope enrichments resulting only from photochemical sinks of methane up to the m...
In this study we focus on 1) the data quality assessment and preparation and 2) analysis of temporal trends of compositions observed at selected 26 non-urban EANET stations. Speciation includes gas-phase (SO2, HNO3, HCl, NH3) and particulate matter (SO42−, NO3−, Cl−, NH4+, Na+, K+, Mg2+, Ca2+) abundances analysed in samples collected using filterpa...
The 17O and 18O isotope fractionation associated with photolysis of O3 in the Chappuis band was determined using a broadband light source with cutoff filters at 455, 550, 620nm and narrow band light sources at 530, 617 and 660nm. The isotope effects follow a mass-dependent fractionation pattern (δ17O/δ18O = 0.53). Contrary to theoretical prediction...
An issue of ozone-driven artefact production of CO in the UT/LMS air analysed in the CARIBIC-1 project is being discussed. By confronting the CO mixing / isotope ratios obtained from different analytical instrumentation, we (1) reject natural/artificial sampling and mixing effects as possible culprits of the problem, (2) ascertain the photochemical...
This study aims at an improved understanding of the stable carbon and oxygen isotope composition of the carbon monoxide (CO) in the global atmosphere by means of numerical simulations. At first, a new kinetic chemistry tagging technique for the most complete parameterisation of isotope effects has been introduced into the Modular Earth Submodel Sys...
Estimates of the climatological air mass exchange in the lower troposphere (within 3 km average sea level, a.s.l.) across two regions of the Russian border in Eastern Siberia and the Russian Far East are obtained using the long-term air sound data on mean layer winds. Using a simplified transport box-model, annual and seasonal exchange of air was c...
We present version 3.0 of the atmospheric chemistry box model CAABA/MECCA. In addition to a complete update of the rate coefficients to the most recent recommendations, a number of new features have been added: chemistry in multiple aerosol size bins; automatic multiple simulations reaching steady-state conditions; Monte-Carlo simulations with rand...
We present version 3.0gmdd of the atmospheric chemistry box model CAABA/MECCA. In addition to a complete update of the rate coefficients to the most recent recommendations, a number of new features have been added: chemistry in multiple aerosol size bins; automatic multiple simulations reaching steady-state conditions; Monte-Carlo simulations with...
The Modular Earth Submodel System (MESSy) is an open, multi- institutionalproject providing a strategy for developing comprehensive Earth System Models(ESMs) with highly flexible complexity. The first version of the MESSyinfrastructure and process submodels, mainly focusing on atmosphericchemistry, has been successfully coupled to an atmospheric Ge...
The Modular Earth Submodel System (MESSy) is an open, multi-institutional project providing a strategy for developing comprehensive Earth System Models (ESMs) with highly flexible complexity. The first version of the MESSy infrastructure and process submodels, mainly focusing on atmospheric chemistry, has been successfully coupled to an atmospheric...
Isotope composition, in many cases, holds unique information on sources, chemical modification and sinks of atmospheric trace gases. Vital to the interpretation and use of an increasing number of isotope analyses is appropriate modelling. However, the exact implementation of isotopic information is a challenge, and often studies use simplifications...
A short review of snow cover parametrizations used in different atmospheric general circulation models is given. The results of comparison of 20-year mean integral characteristics of snow cover for North America and Eurasia obtained in three Russian models in the AMIP-2 experiments with observations and reanalysis data are analyzed. Results of the...
A new parameterization scheme of land hydrology was introduced into GCM of Hydrometeorological Centre of Russia. In this paper, a short description of GCM and the scheme and their main parameters is given, as well as some results of experiments are discussed. Special attention is paid to snow representation in 3 Russian and some world-class GCMs. A...
Questions
Question (1)
Hi Garlich!
Hella and myself would like to add our papers to the CARIBIC page on RG (this will add to its "score" and visibility, I believe), but I seem to be not able to do that... do we need to be members of the project?
Cheers,
Sergey
Projects
Projects (3)
Quality control, analysis and application of the observational data from the Acid Deposition Monitoring Network in East Asia (EANET)
Link: http://www.eanet.cc
PalMod - German Climate Modelling Initiative - Paleoclimate Modelling - is a project funded by the Federal Ministry of Education and Science (BMBF) to understand climate system dynamics and variability during the last glacial cycle.
link: http://www.palmod.de
CARIBIC is an innovative scientific project to study and monitor important chemical and physical processes in the Earth´s atmosphere. Detailed and extensive measurements are made during long distance flights. We deploy an airfreight container with automated scientific apparatus which are connected to an air and particle (aerosol) inlet underneath the aircraft. We use an Airbus A340-600 from Lufthansa since December 2004. (www.http://caribic-atmospheric.com)