A5078307835- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Atmospheric chemistry and aerosols
- Methane Hydrates and Related Phenomena
- Atmospheric aerosols and clouds
- Hydrocarbon exploration and reservoir analysis
- Spectroscopy and Laser Applications
- Coal Properties and Utilization
- Air Quality Monitoring and Forecasting
- Earthquake Detection and Analysis
- Carbon Dioxide Capture Technologies
- Climate variability and models
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2019-2024
Abstract. The calculation of the radiative transfer is a key component global circulation models. In this article, we describe most recent updates radiation infrastructure in Modular Earth Submodel System (MESSy). These include implementation PSrad scheme within RAD submodel. Furthermore, radiation-related submodels CLOUDOPT (for cloud optical properties) and AEROPT aerosol have been updated are now more flexible order to deal with different sets shortwave longwave bands schemes. wake these...
Methane is a potent greenhouse gas which has substantially contributed to climate change since the pre-industrial era, second only in importance carbon dioxide. Due its short atmospheric lifetime and high global warming potential, methane emissions have disproportionately large impacts on near-term change. Beyond direct role as gas, also other important implications for climate, human health, air quality vegetation, largely due impact tropospheric ozone. Thus, reducing been identified key...
The hydroxyl radical (OH) serves as a primary sink for CH4 in the atmosphere and plays an important role interpreting global budget. Changes OH trend have recently been proposed potential explanation renewed increase of simultaneous decrease δ13C(CH4) since 2007. In this work, we introduce comprehensive numerical sensitivity simulations to explore impact temporal variations on globally averaged mixing ratio signature. We apply state-of-the-art chemistry-climate model EMAC use...
Abstract. Methane (CH4) is the second-most important directly emitted greenhouse gas, atmospheric concentration of which influenced by human activities. In this study, numerical simulations with chemistry–climate model (CCM) EMAC are performed, aiming to assess possible consequences significantly enhanced CH4 concentrations in Earth's atmosphere for climate. We analyse experiments 2×CH4 and 5×CH4 present-day (2010) mixing ratio its quasi-instantaneous chemical impact on atmosphere. The...
Abstract. Climate projections including chemical feedbacks rely on state-of-the-art chemistry–climate models (CCMs). Of particular importance is the role of methane (CH4) for budget stratospheric water vapour (SWV), which has an important climate impact. However, simulations with CCMs are, due to large number involved species, computationally demanding, limits simulation sensitivity studies. To allow studies and ensemble a reduced demand computational resources, we introduce simplified...
Abstract. The calculation of the radiative transfer is a key component global circulation models. In this manuscript we describe most recent updates radiation infrastructure in Modular Earth Submodel System (MESSy). These include implementation PSrad scheme within RAD submodel. Further, radiation-related submodels CLOUDOPT (for cloud optical properties) and AEROPT aerosol have been updated are now more flexible order to deal with different sets shortwave longwave bands schemes. wake these...
Abstract. Methane (CH4) is an important greenhouse gas, and its atmospheric budget determined by interacting sources sinks in a dynamic global environment. observations indicate that after almost decade of stagnation, from 2006, sudden continuing mixing ratio increase took place. We applied general circulation model to simulate the budget, variability, trends methane for period 1997–2016. Using interannually constant CH4 priori emissions 11 biogenic fossil source categories, results are...
Abstract. In a previous study the quasi-instantaneous chemical impacts (rapid adjustments) of strongly enhanced methane (CH4) mixing ratios have been analysed. However, to quantify influence respective slow climate feedbacks on composition it is necessary include radiation-driven temperature feedback. Therefore, we perform sensitivity simulations with doubled and quintupled present-day (year 2010) CH4 chemistry–climate model EMAC (European Centre for Medium-Range Weather Forecasts, Hamburg...
Abstract. The chemical sink of atmospheric methane (CH4) depends on the temperature and composition. Here, we assess feedback CH4 induced by changes in a warming climate using emission flux driven setup chemistry-climate model EMAC, which mixing ratios can evolve explicitly. We perform idealized perturbation simulations either increased carbon dioxide (CO2) ratios, or fluxes. leads to large increase ratios. Remarkably, factor ratio increases is larger than flux, because lifetime extended. In...
Abstract. Methane (CH4) is the second most important greenhouse gas, which atmospheric concentration influenced by human activities. In this study, numerical simulations with a chemistry-climate model (CCM) are performed aiming to assess possible consequences of significantly enhanced CH4 concentrations in Earth's atmosphere for climate. We analyze experiments 2xCH4 and 5xCH4 present day (2010) mixing ratio its quasi-instantaneous chemical impact on atmosphere. The massive increase strongly...
<p>Emissions from fossil fuels are one of the primary sources atmospheric methane (CH<sub>4</sub>) growth. However, estimates anthropogenic CH<sub>4</sub> emissions still show large uncertainties on global and regional scales. Differences in isotopic source signatures δ<sup>13</sup>C δD can help to constrain different contributions (e.g. fossil, thermogenic, or...
Methane (CH4), the second most important greenhouse gas directly emitted by human activity, is removed from atmosphere via chemical degradation.In this study we assess radiative feedback atmospheric CH4 resulting changes in its sink, which mainly oxidation with hydroxyl radical (OH) and, influenced temperature and composition of atmosphere.We present results numerical simulations chemistry-climate model EMAC perturbed either CO2 or increase.The essential innovation simulation set-up use...
The global atmospheric CH4 growth rate stagnated between 2000 and 2007, has continued to grow since 2007. This renewed rise been analysed with respect a 2007 onward decline in  δ13C(CH4), indicating changes the relative contribution of sources. However, this is still subject debate variety hypotheses have put forward. In our work, we present numerical sensitivity simulations that investigate impact different inventories methane emission fluxes on globally averaged...
Abstract. In a previous study the quasi-instantaneous chemical impacts (rapid adjustments) of strongly enhanced methane (CH4) mixing ratios have been analyzed. However, to quantify influence respective slow climate feedbacks on composition it is necessary include radiation driven temperature feedback. Therefore, we perform sensitivity simulations with doubled and fivefold present-day (year 2010) CH4 chemistry-climate model EMAC in novel set-up mixed layer ocean account for tropospheric...
<p>Methane is the second most important anthropogenic greenhouse gas. The globally averaged dry mole fraction has increased considerably since pre-industrial times and its growth even accelerated in 2014, with an annual rise of 12.7 ± 6 ppb. Fossil fuel emissions are one primary sources. However, quantification methane sources sinks still under debate estimates show large uncertainties on global regional scales. Comprehensive measurement campaigns, such as CoMet...
<p>Methane (CH<sub>4</sub>) is the second most important anthropogenic greenhouse gas and its atmospheric abundance rising rapidly at moment (e.g. Nisbet et al., 2019). </p><p>We assess effects of doubled fivefold present-day (2010) CH<sub>4</sub> lower boundary mixing ratios on basis sensitivity simulations with the<br>chemistry-climate model EMAC. As a follow-up...
<p>Methane (CH<sub>4</sub>) is the second most important greenhouse gas, which atmospheric concentration influenced by human activities and currently on a sharp rise. We present study with numerical simulations using Chemistry-Climate-Model (CCM), are performed to assess possible consequences of strongly enhanced CH<sub>4</sub> concentrations in Earth's atmosphere for climate.</p><p>Our analysis...
<p>The increasing future methane (CH<sub>4</sub>) leads to changes in the lifetime of CH<sub>4</sub> and Hydroxyl radical (OH) (O<sub>3</sub>) mixing ratios distribution lower atmosphere. With O<sub>3</sub> troposphere will increase, tropospheric OH decrease (Winterstein et al., 2019; Zhao 2019). The changes, together with Nitrous oxide...
Abstract. Climate projections including chemical feedbacks rely on state-of-the-art chemistry-climate models (CCMs). Of particular importance is the role of methane (CH4) for budget stratospheric water vapor (SWV), which has an important climate impact. However, simulations with CCMs are, due to large number involved species, computationally demanding, limits simulation sensitivity studies. To allow studies and ensemble a reduced demand computational resources, we introduce simplified...