Maarten Krol
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View article: Isotope discrimination of carbonyl sulfide ( <sup>34</sup> S) and carbon dioxide ( <sup>13</sup> C, <sup>18</sup> O) during plant uptake in flow-through chamber experiments
Isotope discrimination of carbonyl sulfide ( <sup>34</sup> S) and carbon dioxide ( <sup>13</sup> C, <sup>18</sup> O) during plant uptake in flow-through chamber experiments Open
Carbonyl sulfide (COS) has been proposed as a proxy for gross primary production (GPP), as it is taken up by plants through a pathway comparable to that of CO2. COS diffuses into the leaf, where it undergoes an essentially one-way reaction…
View article: The Loobos ecosystem first tower dataset: meteorology, turbulent fluxes and net ecosystem exchange (1996 to 2021)
The Loobos ecosystem first tower dataset: meteorology, turbulent fluxes and net ecosystem exchange (1996 to 2021) Open
We describe a 25 years (1996–2021) observational dataset of meteorology, turbulent fluxes and net ecosystem exchange collected from the first tower at the Loobos site, the Netherlands (NL). This is one of the 17 first FLUXNET sites globall…
View article: Leaf chamber experiments on sunflowers indicate a temperature-dependent compensation point of carbonyl sulfide
Leaf chamber experiments on sunflowers indicate a temperature-dependent compensation point of carbonyl sulfide Open
Background Carbonyl Sulfide (COS) is a potential tracer for estimating gross primary productivity (GPP), due to its co-uptake with CO2 in leaves and the assumed absence of re-emission. However, the effectiveness of COS as a GPP tracer depe…
View article: Balloon-borne Stratospheric Vertical Profiling of Carbonyl Sulfide and Evaluation of Ozone Scrubbers
Balloon-borne Stratospheric Vertical Profiling of Carbonyl Sulfide and Evaluation of Ozone Scrubbers Open
Carbonyl sulfide (COS) is a low abundant atmospheric trace gas that has a tropospheric lifetime of 2–2.5 years, allowing it to reach the stratosphere, where it undergoes photolysis and reactions with OH• and O• radicals, generating precurs…
View article: Triple oxygen isotope composition of CO <sub>2</sub> in the upper troposphere and stratosphere
Triple oxygen isotope composition of CO <sub>2</sub> in the upper troposphere and stratosphere Open
High-precision measurements of the triple oxygen isotope composition of CO2 (Δ′17O) can be used to estimate biosphere–atmosphere exchange of CO2, the residence time of tropospheric CO2, and stratosphere–troposphere exchange. In this study,…
View article: Top-down CO emission estimates using TROPOMI CO data in the TM5-4DVAR (r1258) inverse modeling suit
Top-down CO emission estimates using TROPOMI CO data in the TM5-4DVAR (r1258) inverse modeling suit Open
Carbon monoxide in the atmosphere adversely affects air quality and climate, making knowledge about its sources crucial. However, current global bottom-up emission estimates retain significant uncertainties. In this study, we attempt to re…
View article: First coupled H2-HD inversion with a 3D chemical transport model (TM5): Constraining the global hydrogen budget
First coupled H2-HD inversion with a 3D chemical transport model (TM5): Constraining the global hydrogen budget Open
Hydrogen (H2) is expected to become an increasingly important energy carrier during the energy transition. This will likely cause increased levels of atmospheric H2, due to unavoidable losses during the production, transport, storage, and …
View article: Investigating the Benefits of Large-Eddy Simulation for Simulating Urban CO2 Emissions Using WRF-LES Over the Paris Area
Investigating the Benefits of Large-Eddy Simulation for Simulating Urban CO2 Emissions Using WRF-LES Over the Paris Area Open
Urban areas are significant contributors to global CO2 emissions, and simulating CO2 dispersion in these regions, especially near emission hotspots, presents considerable challenges due to the complex dynamics at small scales. High-resolut…
View article: Gas-particle partitioning and yield of organic nitrate under different VOC, NOx, and oxidation conditions
Gas-particle partitioning and yield of organic nitrate under different VOC, NOx, and oxidation conditions Open
Particulate nitrate is a major aerosol component worldwide that acts as a reservoir of urban nitrogen oxides (NOx=NO+NO2). Chemical reactions of NOx with volatile organic compounds (VOCs) will form organic nitrates that undergo gas-particl…
View article: Exploring the influence of OH fields and secondary CO production on CO emission estimates
Exploring the influence of OH fields and secondary CO production on CO emission estimates Open
Inverse modeling can provide valuable insights into the sources of atmospheric tracers based on observations and a set of boundary conditions. However, biases in these boundary conditions can lead to biases in the optimized emissions. In t…
View article: Global carbon monoxide emissions constrained by TROPOMI
Global carbon monoxide emissions constrained by TROPOMI Open
Since carbon monoxide (CO) in the atmosphere adversely affects air quality and climate, knowledge about its sources is crucial. However, current global bottom-up emission estimates retain significant uncertainties. In this study, we attemp…
View article: Isotope discrimination of carbonyl sulfide ( <sup>34</sup> S) and carbon dioxide ( <sup>13</sup> C, <sup>18</sup> O) during plant uptake in flow-through chamber experiments
Isotope discrimination of carbonyl sulfide ( <sup>34</sup> S) and carbon dioxide ( <sup>13</sup> C, <sup>18</sup> O) during plant uptake in flow-through chamber experiments Open
Carbonyl sulfide (COS) has been proposed as a proxy for gross primary production (GPP), as it is taken up by plants through a comparable pathway as CO2. COS diffuses into the leaf and undergoes an essentially one-way reaction in the mesoph…
View article: An improved Bayesian inversion to estimate daily NO <sub>x</sub> emissions of Paris from TROPOMI NO <sub>2</sub> observations between 2018–2023
An improved Bayesian inversion to estimate daily NO <sub>x</sub> emissions of Paris from TROPOMI NO <sub>2</sub> observations between 2018–2023 Open
We present a comprehensive quantification of daily NOx emissions from Paris using an inverse analysis of tropospheric NO2 columns measured by the Tropospheric Monitoring Instrument (TROPOMI) over a 5-year period (May 2018–August 2023). Our…
View article: Triple oxygen isotope composition of CO <sub>2</sub> in the upper troposphere and stratosphere
Triple oxygen isotope composition of CO <sub>2</sub> in the upper troposphere and stratosphere Open
High precision measurements of the triple oxygen isotope composition of CO2 (∆′17O) can be used to estimate biosphere-atmosphere exchange of CO2, the residence time of tropospheric CO2 and stratosphere-troposphere exchange. In this study, …
View article: Evaluating NO <sub> <i>x</i> </sub> stack plume emissions using a high-resolution atmospheric chemistry model and satellite-derived NO <sub>2</sub> columns
Evaluating NO <sub> <i>x</i> </sub> stack plume emissions using a high-resolution atmospheric chemistry model and satellite-derived NO <sub>2</sub> columns Open
This paper presents large-eddy simulations with atmospheric chemistry of four large point sources world-wide, focusing on the evaluation of NOx (NO + NO2) emissions with the TROPOspheric Monitoring Instrument (TROPOMI). We implemented a co…
View article: Efficacy of high-resolution satellite observations in inverse modeling of carbon monoxide emissions using TM5-4dvar (r1258)
Efficacy of high-resolution satellite observations in inverse modeling of carbon monoxide emissions using TM5-4dvar (r1258) Open
Carbon monoxide in the atmosphere adversely affects air quality and climate, making knowledge about its sources crucial. However, current global bottom-up emission estimates retain significant uncertainties. In this study, we attempt to re…
View article: A lightweight NO <sub>2</sub> -to-NO <sub> <i>x</i> </sub> conversion model for quantifying NO <sub> <i>x</i> </sub> emissions of point sources from NO <sub>2</sub> satellite observations
A lightweight NO <sub>2</sub> -to-NO <sub> <i>x</i> </sub> conversion model for quantifying NO <sub> <i>x</i> </sub> emissions of point sources from NO <sub>2</sub> satellite observations Open
Nitrogen oxides (NOx = NO + NO2) are air pollutants which are co-emitted with CO2 during high-temperature combustion processes. Monitoring NOx emissions is crucial for assessing air quality and for providing proxy estimates of CO2 emission…
View article: Combined assimilation of NOAA surface and MIPAS satellite observations to constrain the global budget of carbonyl sulfide
Combined assimilation of NOAA surface and MIPAS satellite observations to constrain the global budget of carbonyl sulfide Open
Carbonyl sulfide (COS), a trace gas in our atmosphere that leads to the formation of aerosols in the stratosphere, is largely taken up by terrestrial ecosystems. Quantifying the biosphere uptake of COS could provide a useful quantity to es…
View article: Stratospheric observations of carbonyl sulfide using AirCore and LISA
Stratospheric observations of carbonyl sulfide using AirCore and LISA Open
Carbonyl sulfide (COS) is a long-lived sulfur compound present in the atmosphere with an average mole fraction of around 450-500 ppt, and is considered as a potential tracer to partition gross primary production (GPP) and net ecosystem exc…
View article: Evolution of atmospheric methane clumped isotope anomalies since the 1990s reconstructed from firn air measurements
Evolution of atmospheric methane clumped isotope anomalies since the 1990s reconstructed from firn air measurements Open
The global atmospheric methane mole fractions have risen since the pre-industrial times, primarily attributed to anthropogenic emissions, overlayed by significant multi-annual variability. Atmospheric methane is influenced by different met…
View article: Disentangling carbonyl sulphide ecosystem relative uptake using (inverse) canopy modelling&#160;
Disentangling carbonyl sulphide ecosystem relative uptake using (inverse) canopy modelling  Open
Carbonyl sulphide (COS) has been used in earlier studies as a proxy for determining photosynthesis. To this end, the concepts of leaf relative uptake (LRU, ratio of COS and CO2 deposition velocities at leaf scale) and ecosystem relative up…
View article: A comprehensive model for COS isotope discrimination during leaf COS uptake
A comprehensive model for COS isotope discrimination during leaf COS uptake Open
Anthropogenically emitted CO2 is warming the earth’s climate to temperatures that already exceed pre-industrial levels by more than 1.2 oC. Terrestrial vegetation has slowed the rate of climate change by removing part of this anthrop…
View article: Estimating NO <sub>x</sub> emissions of stack plumes using a high-resolution atmospheric chemistry model and satellite-derived NO <sub>2</sub> columns
Estimating NO <sub>x</sub> emissions of stack plumes using a high-resolution atmospheric chemistry model and satellite-derived NO <sub>2</sub> columns Open
This work contributes to an European Monitoring and Verification Support (MVS) capacity for anthropogenic CO2 emissions. Future satellite instruments that map CO2 and NO2 from space will focus on hot-spot emissions from cities and large po…