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Dive into the research topics where Sigrun Matthes is active.

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Featured researches published by Sigrun Matthes.


Journal of Geophysical Research | 2007

Multimodel projections of stratospheric ozone in the 21st century

Veronika Eyring; Darryn W. Waugh; G. E. Bodeker; Eugene C. Cordero; Hideharu Akiyoshi; John Austin; S. R. Beagley; B. A. Boville; Peter Braesicke; C. Brühl; Neal Butchart; M. P. Chipperfield; Martin Dameris; Rudolf Deckert; Makoto Deushi; S. M. Frith; Rolando R. Garcia; Andrew Gettelman; Marco A. Giorgetta; Douglas E. Kinnison; E. Mancini; Elisa Manzini; Daniel R. Marsh; Sigrun Matthes; Tatsuya Nagashima; Paul A. Newman; J. E. Nielsen; S. Pawson; G. Pitari; David A. Plummer

[1] Simulations from eleven coupled chemistry-climate models (CCMs) employing nearly identical forcings have been used to project the evolution of stratospheric ozone throughout the 21st century. The model-to-model agreement in projected temperature trends is good, and all CCMs predict continued, global mean cooling of the stratosphere over the next 5 decades, increasing from around 0.25 K/decade at 50 hPa to around 1 K/ decade at 1 hPa under the Intergovernmental Panel on Climate Change (IPCC) Special Report on Emissions Scenarios (SRES) A1B scenario. In general, the simulated ozone evolution is mainly determined by decreases in halogen concentrations and continued cooling of the global stratosphere due to increases in greenhouse gases (GHGs). Column ozone is projected to increase as stratospheric halogen concentrations return to 1980s levels. Because of ozone increases in the middle and upper stratosphere due to GHGinduced cooling, total ozone averaged over midlatitudes, outside the polar regions, and globally, is projected to increase to 1980 values between 2035 and 2050 and before lowerstratospheric halogen amounts decrease to 1980 values. In the polar regions the CCMs simulate small temperature trends in the first and second half of the 21st century in midwinter. Differences in stratospheric inorganic chlorine (Cly) among the CCMs are key to diagnosing the intermodel differences in simulated ozone recovery, in particular in the Antarctic. It is found that there are substantial quantitative differences in the simulated Cly, with the October mean Antarctic Cly peak value varying from less than 2 ppb to over 3.5 ppb in the CCMs, and the date at which the Cly returns to 1980 values varying from before 2030 to after 2050. There is a similar variation in the timing of recovery of Antarctic springtime column ozone back to 1980 values. As most models underestimate peak Clynear 2000, ozone recovery in the Antarctic could occur even later, between 2060 and 2070. In the Arctic the column ozone increase in spring does not follow halogen decreases as closely as in the Antarctic, reaching 1980 values before Arctic halogen amounts decrease


Geophysical Research Letters | 2006

Solar cycle effect delays onset of ozone recovery

Martin Dameris; Sigrun Matthes; Rudolf Deckert; Volker Grewe; Michael Ponater

Short- and long-term changes of total ozone are investigated by means of an ensemble simulation with the coupled chemistry-climate model E39/C for the period 1960 to 2020. Past total ozone changes are well simulated on both, long (decadal) and short (monthly) timescales. Even the 2002 Antarctic ozone anomaly appears in the ensemble. The model results indicate that the 11-year solar cycle will delay the onset of a sustained ozone recovery. The lowest global mean total ozone values occur between 2005 and 2010, although stratospheric chlorine loading is assumed to decline after 2000. E39/C results exhibit a significant increase of total ozone after the beginning of the next decade, following the upcoming solar minimum. The observed ozone increase in the second half of the 1990s is reproduced by E39/C and is identified as a combined post- Pinatubo and solar cycle effect rather than the beginning of a sustainable ozone recovery.


Archive | 2012

Climate optimized air transport

Sigrun Matthes; Ulrich Schumann; Volker Grewe; Christine Frömming; Katrin Dahlmann; Alexander Koch; Hermann Mannstein

Aviation climate impact is caused by CO2 and non-CO2 emissions where the climate effect of non-CO2 emissions depends on weather and aircraft route. An aviation system with minimum climate impact differs from a system with minimum emissions. Considerable potential exists to reduce the climate impact of aviation by weather- and cost-dependent climate-optimized air traffic management (“smart routing”) and aircraft design (“green aircraft”). Current research provides a unique opportunity to systematically investigate the trade-offs between various mitigation concepts and cost functions. Here various approaches are presented to minimize the climate impact on a climatological and weather basis, some being applicable to aircraft designs for reduced climate impact and others offering alternative operational concepts.


Atmospheric Measurement Techniques | 2017

The novel HALO mini-DOAS instrument: Inferring trace gas concentrations from air-borne UV/visible limb spectroscopy under all skies using the scaling method

Tilman Hüneke; Oliver-Alex Aderhold; Jannik Bounin; M. Dorf; Eric S. Gentry; Katja Grossmann; J.-U. Grooß; P. Hoor; Patrick Jöckel; Mareike Kenntner; Marvin Knapp; Matthias Knecht; Dominique Lörks; Sabrina Ludmann; Sigrun Matthes; Rasmus Raecke; Marcel Reichert; Jannis Weimar; Bodo Werner; A. Zahn; H. Ziereis; K. Pfeilsticker

We report on a novel six-channel optical spectrometer (further on called mini-DOAS instrument) for airborne nadir and limb measurements of atmospheric trace gases, liquid and solid water, and spectral radiances in the UV/vis and NIR spectral ranges. The spectrometer was developed for measurements from aboard the German High-Altitude and Long-Range (HALO) research aircraft during dedicated research missions. Here we report on the relevant instrumental details and the novel scaling method used to infer the mixing ratios of UV/vis absorbing trace gases from their absorption measured in limb geometry. The uncertainties of the scaling method are assessed in more detail than before for sample measurements of NO2 and BrO. Some first results are reported along with complementary measurements and comparisons with model predictions for a selected HALO research flight from Cape Town to Antarctica, which was performed during the research mission ESMVal on 13 September 2012.


ieee aiaa digital avionics systems conference | 2017

Optimization without limits — The world wide air traffic management project

Alexander Kuenz; Gunnar Schwoch; Bernd Korn; Caroline Forster; Thomas Gerz; Volker Grewe; Sigrun Matthes; Thomas Gräupl; Markus Rippl; Florian Linke; Marius Radde

In air traffic management, optimization is often restricted to local areas, e.g., to the vicinity of airports. Procedures around these areas stay unchanged, and effects from optimizations concerning ecological efficiency are not considered adequately. Investigating new concepts, this typically results in local gain of efficiency without proving the global benefit. The project World Wide Air Traffic Management (WW-ATM) creates a platform for optimization and validation of world-wide concepts considering feasibility, throughput, costs-and ecological efficiency, and robustness respectively fault liability. Based on different evaluation and optimization tools, complete traffic scenarios can be analyzed and improved both strategically and tactically.


Atmospheric Chemistry and Physics | 2005

Long-term changes and variability in a transient simulation with a chemistry-climate model employing realistic forcing

Martin Dameris; Volker Grewe; Michael Ponater; Rudolf Deckert; Veronika Eyring; Fabian Mager; Sigrun Matthes; Christina Schnadt; Andrea Stenke; Benedikt Steil; C. Brühl; Marco A. Giorgetta


Geoscientific Model Development | 2016

Earth system chemistry integrated modelling (ESCiMo) with the modular earth submodel system (MESSy) version 2.51

Patrick Jöckel; H. Tost; Andrea Pozzer; Markus Kunze; Oliver Kirner; Carl A. M. Brenninkmeijer; Sabine Brinkop; Duy Sinh Cai; Christoph Dyroff; Johannes Eckstein; Franziska Frank; Hella Garny; Klaus-Dirk Gottschaldt; Phoebe Graf; Volker Grewe; Astrid Kerkweg; Bastian Kern; Sigrun Matthes; Mariano Mertens; Stefanie Meul; Marco Neumaier; Matthias Nützel; Sophie Oberländer-Hayn; R. Ruhnke; Theresa Runde; R. Sander; D. Scharffe; A. Zahn


Atmospheric Environment | 2012

Attributing ozone to NOx emissions: Implications for climate mitigation measures

Volker Grewe; Katrin Dahlmann; Sigrun Matthes; Wolfgang Steinbrecht


Atmospheric Environment | 2011

Quantifying the contributions of individual NOx sources to the trend in ozone radiative forcing

Katrin Dahlmann; Volker Grewe; Michael Ponater; Sigrun Matthes


Atmospheric Chemistry and Physics | 2005

Global impact of road traffic emissions on tropospheric ozone

Sigrun Matthes; Volker Grewe; Robert Sausen; G.H.A. Roelofs

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Volker Grewe

German Aerospace Center

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Hella Garny

German Aerospace Center

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