Global Atmospheric δ13CH4 and CH4 Trends for 2000–2020 from the Atmospheric Transport Model TM5 Using CH4 from Carbon Tracker Europe–CH4 Inversions

This study investigates atmospheric (Formula presented.) CH (Formula presented.) trends, as produced by a global atmospheric transport model using CH (Formula presented.) inversions from CarbonTracker-Europe CH (Formula presented.) for 2000-2020, and compares them to observations. The CH (Formula presented.) inversions include the grouping of...

The CoCO2 global nature run as an evaluation tool of the integrated earth system model to support the monitoring of greenhouse gas emissions

The Role of Emission Sources and Atmospheric Sink in the Seasonal Cycle of CH4 and ?13-CH4: Analysis Based on the Atmospheric Chemistry Transport Model TM5

This study investigates the contribution of different CH4 sources to the seasonal cycle of δ13C during 2000–2012 by using the TM5 atmospheric transport model, including spatially varying information on isotopic signatures. The TM5 model is able to produce the background seasonality of δ13C, but the discrepancies compared to the observations...

Technical note: Interpretation of field observations of point-source methane plume using observation-driven large-eddy simulations

This study demonstrates the ability of large-eddy simulation (LES) forced by a large-scale model to reproduce plume dispersion in an actual field campaign. Our aim is to bring together field observations taken under non-ideal conditions and LES to show that this combination can help to derive point-source strengths from sparse observations. We...

Reductions in nitrogen oxides over the Netherlands between 2005 and 2018 observed from space and on the ground: Decreasing emissions and increasing O3 indicate changing NOx chemistry

A pragmatic protocol for characterising errors in atmospheric inversions of methane emissions over Europe

This study aims at estimating errors to be accounted for in atmospheric inversions of methane (CH4) emissions at the European scale. Four types of errors are estimated in the concentration space over the model domain and at selected measurement sites. Furthermore, errors in emission inventories are estimated at country and source sector scales....

The CO2 Human Emissions (CHE)Project: First Steps Towards a European Operational Capacity to Monitor Anthropogenic CO2 Emissions

The Paris Agreement of the United Nations Framework Convention on Climate Change is a binding international treaty signed by 196 nations to limit their greenhouse gas emissions through ever-reducing Nationally Determined Contributions and a system of 5-yearly Global Stocktakes in an Enhanced Transparency Framework. To support this process, the...

Influence of Atmospheric Transport on Estimates of Variability in the Global Methane Burden

We quantify the impact of atmospheric transport and limited marine boundary layer sampling on changes in global and regional methane burdens estimate using tracer transport model simulations with annually repeating methane emissions and sinks but varying atmospheric transport patterns. We find the 1σ error due to this transport and sampling...

Evaluation of the boundary layer dynamics of the TM5 model over Europe

We evaluate the capability of the global atmospheric transport model TM5 to simulate the boundary layer dynamics and associated variability of trace gases close to the surface, using radon (222Rn). Focusing on the European scale, we compare the boundary layer height (BLH) in the TM5 model with observations from the National Oceanic and...

Een economische evaluatie van 2 cariëspreventie strategieën vergeleken met standaardzorg

A cost-effectiveness evaluation was conducted with a randomised controlled clinical trial of caries prevention measures among 6-year-old children who were assigned to either a control group or 1 of 2 experimental groups (IPFA: 2 extra professionally-delivered fluoride applications per year, or NOCTP: a non-operative caries treatment programme,...

Value for Money: Economic Evaluation of Two Different Caries Prevention Programmes Compared with standard Care in a Randomized Controlled Trial

A cost-effectiveness analysis was conducted during a 3-year randomized controlled clinical trial in a general dental practice in the Netherlands in which 230 6-year-old children (± 3 months) were assigned to either regular dental care, an increased professional fluoride application (IPFA) programme or a non-operative caries treatment and...

Atmospheric CH4 in the first decade of the 21st century: Inverse modeling analysis using SCIAMACHY satellite retrievals and NOAA surface measurements

The causes of renewed growth in the atmospheric CH4 burden since 2007 are still poorly understood and subject of intensive scientific discussion. We present a reanalysis of global CH4 emissions during the 2000s, based on the TM5-4DVAR inverse modeling system. The model is optimized using high-accuracy surface observations from NOAA ESRL's global...

Skill and uncertainty of a regional air quality model ensemble

Recently several regional air quality projects were carried out to support the negotiation under the Clean Air For Europe (CAFE) programme by predicting the impact of emission control policies with an ensemble of models. Within these projects, CITYDELTA and EURODELTA, the fate of air quality at the scale of European cities or that of the...

Evaluation of long-term ozone simulations from seven regional air quality models and their ensemble

Long-term ozone simulations from seven regional air quality models, the Unified EMEP model, LOTOS-EUROS, CHIMERE, RCG, MATCH, DEHM and TM5, are intercompared and compared to ozone measurements within the framework of the EuroDelta experiment, designed to assess air quality improvement at the European scale in response to emission reduction...

Is regional air quality model diversity representative of uncertainty for ozone simulation?

We examine whether seven state-of-the-art European regional air quality models provide daily ensembles of predicted ozone maxima that encompass observations. Using tools borrowed from the evaluation of ensemble weather forecasting, we analyze statistics of simulated ensembles of ozone daily maxima over an entire summer season. Although the model...