Casper Labuschagne
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View article: Quantifying CO emissions from boreal wildfires by assimilating TROPOMI and TCCON observations
Quantifying CO emissions from boreal wildfires by assimilating TROPOMI and TCCON observations Open
We perform a global inverse modelling analysis to quantify biomass burning emissions of carbon monoxide (CO) from the extreme wildfires in Canada between May and September 2023. Using the GEOS-Chem model, we assimilated observations at 3 d…
View article: The role of the tropical carbon balance in determining the large atmospheric CO <sub>2</sub> growth rate in 2023
The role of the tropical carbon balance in determining the large atmospheric CO <sub>2</sub> growth rate in 2023 Open
The global annual mean atmospheric CO2 growth rate in 2023 was one of the highest since records began in 1958, comparable to values recorded during previous major El Niño events. We do not fully understand this anomalous growth rate, altho…
View article: Constraining elemental mercury air–sea exchange using long-term ground-based observations
Constraining elemental mercury air–sea exchange using long-term ground-based observations Open
Air–sea exchange of gaseous elemental mercury (Hg0) is a major component of the global mercury (Hg) biogeochemical cycle but remains poorly understood due to sparse in situ measurements. Here, we used long-term atmospheric Hg0 (Hgair0) obs…
View article: The role of the tropical carbon balance in determining the large atmospheric CO <sub>2</sub> growth rate in 2023
The role of the tropical carbon balance in determining the large atmospheric CO <sub>2</sub> growth rate in 2023 Open
The global annual mean atmospheric CO2 growth rate in 2023 was one of the highest since records began in 1958, comparable to values recorded during previous major El Niño events. We do not fully understand this anomalous growth rate, altho…
View article: Quantifying CO emissions from boreal wildfires by assimilating TROPOMI and TCCON observations
Quantifying CO emissions from boreal wildfires by assimilating TROPOMI and TCCON observations Open
We perform an inverse modelling analysis to quantify biomass burning emissions of carbon monoxide (CO) from the extreme wildfires in Canada between May and September 2023. Using the GEOS-Chem model, we assimilated observations from the Tro…
View article: Supplementary material to "Quantifying CO emissions from boreal wildfires by assimilating TROPOMI and TCCON observations"
Supplementary material to "Quantifying CO emissions from boreal wildfires by assimilating TROPOMI and TCCON observations" Open
View article: Supplementary material to "Constraining elemental mercury air–sea exchange using long-term ground-based observations"
Supplementary material to "Constraining elemental mercury air–sea exchange using long-term ground-based observations" Open
View article: Constraining elemental mercury air–sea exchange using long-term ground-based observations
Constraining elemental mercury air–sea exchange using long-term ground-based observations Open
Air-sea exchange of gaseous elemental mercury (Hg0) is a major component of the global mercury (Hg) biogeochemical cycle but remains poorly understood due to sparse in situ measurements. Here, we used long-term atmospheric Hg0 (Hg0air) obs…
View article: Patterns and trends of atmospheric mercury in the GMOS network: Insights based on a decade of measurements
Patterns and trends of atmospheric mercury in the GMOS network: Insights based on a decade of measurements Open
View article: Trace gas balloon borne in situ measurements in the Southern Hemisphere
Trace gas balloon borne in situ measurements in the Southern Hemisphere Open
The Southern Hemisphere has long been underrepresented in high altitude in situ trace gas measurements. This leads to significant uncertainties in understanding and predicting their effects on stratospheric chemistry and circulation. In a …
View article: Patterns and Trends of Atmospheric Mercury in the Gmos Network: Insights Based on a Decade of Measurements
Patterns and Trends of Atmospheric Mercury in the Gmos Network: Insights Based on a Decade of Measurements Open
View article: A synthesis of mercury research in the Southern Hemisphere, part 2: Anthropogenic perturbations
A synthesis of mercury research in the Southern Hemisphere, part 2: Anthropogenic perturbations Open
Environmental mercury (Hg) contamination is a global concern requiring action at national scales. Scientific understanding and regulatory policies are underpinned by global extrapolation of Northern Hemisphere Hg data, despite historical, …
View article: Wet season chemical composition of atmospheric wet deposition at Cape Point
Wet season chemical composition of atmospheric wet deposition at Cape Point Open
The measurement of precipitation chemistry enables the assessment of the temporal and spatial evolution of the chemical composition of the atmosphere associated with atmospheric physical and chemical mechanisms. The aims of this study were…
View article: Key challenges for tropospheric chemistry in the Southern Hemisphere
Key challenges for tropospheric chemistry in the Southern Hemisphere Open
This commentary paper from the recently formed International Global Atmospheric Chemistry (IGAC) Southern Hemisphere Working Group outlines key issues in atmospheric composition research that particularly impact the Southern Hemisphere. In…
View article: Investigating the Long-Range Transport of Aerosol Plumes Following the Amazon Fires (August 2019): A Multi-Instrumental Approach from Ground-Based and Satellite Observations
Investigating the Long-Range Transport of Aerosol Plumes Following the Amazon Fires (August 2019): A Multi-Instrumental Approach from Ground-Based and Satellite Observations Open
Despite a number of studies on biomass burning (BB) emissions in the atmosphere, observation of the associated aerosols and pollutants requires continuous efforts. Brazil, and more broadly Latin America, is one of the most important season…
View article: A global analysis of climate-relevant aerosol properties retrieved from the network of Global Atmosphere Watch (GAW) near-surface observatories
A global analysis of climate-relevant aerosol properties retrieved from the network of Global Atmosphere Watch (GAW) near-surface observatories Open
Aerosol particles are essential constituents of the Earth's atmosphere, impacting the earth radiation balance directly by scattering and absorbing solar radiation, and indirectly by acting as cloud condensation nuclei. In contrast to most …
View article: Multidecadal trend analysis of in situ aerosol radiative properties around the world
Multidecadal trend analysis of in situ aerosol radiative properties around the world Open
In order to assess the evolution of aerosol parameters affecting climate change, a long-term trend analysis of aerosol optical properties was performed on time series from 52 stations situated across five continents. The time series of mea…
View article: Atmospheric mercury in the Southern Hemisphere – Part 1: Trend and inter-annual variations in atmospheric mercury at Cape Point, South Africa, in 2007–2017, and on Amsterdam Island in 2012–2017
Atmospheric mercury in the Southern Hemisphere – Part 1: Trend and inter-annual variations in atmospheric mercury at Cape Point, South Africa, in 2007–2017, and on Amsterdam Island in 2012–2017 Open
The Minamata Convention on Mercury (Hg) entered into force in 2017, committing its 116 parties (as of January 2019) to curb anthropogenic emissions. Monitoring of atmospheric concentrations and trends is an important part of the effectiven…
View article: Stratosphere–Troposphere Exchange and O3 Variability in the Lower Stratosphere and Upper Troposphere over the Irene SHADOZ Site, South Africa
Stratosphere–Troposphere Exchange and O3 Variability in the Lower Stratosphere and Upper Troposphere over the Irene SHADOZ Site, South Africa Open
This study aims to investigate the Stratosphere-Troposphere Exchange (STE) events and ozone changes over Irene (25.5° S, 28.1° E). Twelve years of ozonesondes data (2000–2007, 2012–2015) from Irene station operating in the framework of the…
View article: Stratosphere&ndash;Troposphere Exchange and O<sub>3</sub> Decline in the Lower Stratosphere over Irene SHADOZ Site, South Africa
Stratosphere–Troposphere Exchange and O<sub>3</sub> Decline in the Lower Stratosphere over Irene SHADOZ Site, South Africa Open
This study aims to investigate the Stratosphere-Troposphere Exchange (STE) events and ozone trends over Irene (25.5°S, 28.1°E). Twelve years of ozonesondes data (2000–2007, 2012–2015) from Irene station operating in the…
View article: Atmospheric mercury in the southern hemisphere – Part 1: Trend and inter-annual variations of atmospheric mercury at Cape Point, South Africa, in 2007–2017, and on Amsterdam Island in 2012–2017
Atmospheric mercury in the southern hemisphere – Part 1: Trend and inter-annual variations of atmospheric mercury at Cape Point, South Africa, in 2007–2017, and on Amsterdam Island in 2012–2017 Open
The Minamata Convention on mercury (Hg) entered into force in 2017, committing its 116 parties (as of January 2019) to curb anthropogenic emissions. Monitoring of atmospheric concentrations and trends is an important part of the effectiven…
View article: Supplementary material to "Atmospheric mercury in the southern hemisphere – Part 1: Trend and inter-annual variations of atmospheric mercury at Cape Point, South Africa, in 2007–2017, and on Amsterdam Island in 2012–2017"
Supplementary material to "Atmospheric mercury in the southern hemisphere – Part 1: Trend and inter-annual variations of atmospheric mercury at Cape Point, South Africa, in 2007–2017, and on Amsterdam Island in 2012–2017" Open
Annual slope Unit R, n, significance GEM average 16.91 ± 3.60 pg m -3 yr -1 0.4436, 92, >99.9% median 16.18 ± 3.61 0.4273, 92, >99.9% CO2 average 2.072 ± 0.025 ppm yr -1 0.9932, 96, >99.9% 2.080 ± 0.020 0.9953, 96, >99.9% Rn average -7.91 …
View article: Supplementary material to "A global analysis of climate-relevant aerosol properties retrieved from the network of GAW near-surface observatories"
Supplementary material to "A global analysis of climate-relevant aerosol properties retrieved from the network of GAW near-surface observatories" Open
Table SM1: Overview of Aerosol Absorption Coefficient measurements.For each site, the instrument used for data collection and corresponding data availability are indicated.The statistics, i.e. median, 10th and 90th quantiles of σ ap are on…
View article: A global analysis of climate-relevant aerosol properties retrieved from the network of GAW near-surface observatories
A global analysis of climate-relevant aerosol properties retrieved from the network of GAW near-surface observatories Open
Aerosol particles are essential constituents of the Earth’s atmosphere, impacting the earth radiation balance directly by scattering and absorbing solar radiation, and indirectly by acting as cloud condensation nuclei. In contrast to most …
View article: Multidecadal trend analysis of aerosol radiative properties at a global scale
Multidecadal trend analysis of aerosol radiative properties at a global scale Open
In order to assess the global evolution of aerosol parameters affecting climate change, a long-term trend analyses of aerosol optical properties were performed on time series from 52 stations situated across five continents. The time serie…
View article: Numerical Features of the Books of the Prophets
Numerical Features of the Books of the Prophets Open
Logotechnical or Quantitative Structural Analysis (QSA) is a systematic investigation of the framework of biblical texts. This activity can also be called numerological criticism. It should certainly not be regarded as a new discipline in …
View article: Numerical Features of Selected Texts
Numerical Features of Selected Texts Open
Logotechnical or Quantitative Structural Analysis (QSA) is a systematic investigation of the framework of biblical texts. This activity can also be called numerological criticism. It should certainly not be regarded as a new discipline in …
View article: Numerical Features of the Psalms, a Logotechnical Quantitative Structural Analysis
Numerical Features of the Psalms, a Logotechnical Quantitative Structural Analysis Open
Logotechnical or Quantitative Structural Analysis (QSA) is a systematic investigation of the framework of biblical texts. This activity can also be called numerological criticism. It should certainly not be regarded as a new discipline in …
View article: Twenty-one years of passive sampling monitoring of SO2, NO2 and O3 at the Cape Point GAW station, South Africa
Twenty-one years of passive sampling monitoring of SO2, NO2 and O3 at the Cape Point GAW station, South Africa Open
View article: Atmospheric HCFC-22, HFC-125, and HFC-152a at Cape Point, South Africa
Atmospheric HCFC-22, HFC-125, and HFC-152a at Cape Point, South Africa Open
One hydrochlorofluorocarbon and two hydrofluorocarbons (HCFC-22, HFC-125, and HFC-152a) were measured in air samples at the Cape Point observatory (CPT), South Africa, during 2017. These data represent the first such atmospheric measuremen…