A selection of new science articles from the past week of interest to the SPARC community (a SPARC Office choice).

An unexpected disruption of the atmospheric quasi-biennial oscillation. By S.M. Osprey et al. in Science.

Early growth dynamical implications for the steerability of stratospheric solar radiation management via sulfur aerosol particles. By F. Benduhn et al. in Geophysical Research Letters.

Aerosol and Monsoon Climate Interactions over Asia. By Z. Li et al. in Reviews of Geophysics.

Diabatic heating and jet stream shifts: A case study of the 2010 negative NAO winter. By T. Woollings et al. in Geophysical Research Letters.

The Stratospheric Pathway of La Niña. By M. Iza et al. in the Journal of Climate.

Artificial bias typically neglected in comparisons of uncertain atmospheric data. By M.R.A. Pitkänen et al. in Geophysical Research Letters.

Case studies of the impact of orbital sampling on stratospheric trend detection and derivation of tropical vertical velocities: solar occultation vs. limb emission sounding. By L.F. Milan et al. in Atmospheric Chemistry and Physics.

Zonally-resolved impact of ENSO on the stratospheric circulation and water vapor entry values. By P. Konopka et al. in the Journal of Geophysical Research: Atmospheres.

Understanding the varied influence of mid-latitude jet position on clouds and cloud-radiative effects in observations and global climate models. By K.M. Grise and B. Medeiros in the Journal of Climate.

The Quasi-Biennial Oscillation of 2015-16: Hiccup or Death Spiral? By T.J. Dunkerton in Geophysical Research Letters.

Chemical and Dynamical Impacts of Stratospheric Sudden Warmings on Arctic Ozone Variability. By S.E. Strahan et al. in the Journal of Geophysical Research: Atmospheres.

Influence of the solar cycle on the Polar-night Jet Oscillation in the Southern Hemisphere. By Y. Kuroda and M. Deushi in the Journal of Geophysical Research: Atmospheres.

Are Sudden Stratospheric Warmings Generic? Insights from an idealized GCM. By M. Jucker in the Journal of the Atmospheric Sciences.

Discussion papers – open for comment

Oceanic emissions unlikely to account for the missing source of atmospheric carbonyl sulfide. By S.T. Lennartz et al. in Atmospheric Chemistry and Physics Discussions.

Accuracy, precision, and temperature dependence of Pandora total ozone measurements estimated from a comparison with the Brewer triad in Toronto. By X. Zhao et al. in Atmospheric Measurement Techniques Discussions.

Improvement of OMI ozone profile retrievals by simultaneously fitting polar mesospheric clouds. By J. Bak et al. in Atmospheric Measurement Techniques Discussions.

Global carbonyl sulfide (OCS) measured by MIPAS/Envisat during 2002–2012. By N. Glatthor et al. in Atmospheric Chemistry and Physics Discussions.

New-generation NASA Aura Ozone Monitoring Instrument (OMI) volcanic SO₂ dataset: Algorithm description, initial results, and continuation with the Suomi-NPP Ozone Mapping and Profiler Suite (OMPS). By C. Li et al. in Atmospheric Measurement Techniques Discussions.

Impact of a moderate volcanic eruption on chemistry in the lower stratosphere: balloon-borne observations and model calculations. By G. Berthet et al. Atmospheric Chemistry and Physics Discussions.

A selection of new science articles from the past week of interest to the SPARC community (a SPARC Office choice).

Advancements, measurement uncertainties, and recent comparisons of the NOAA frost point hygrometer. By E.G. Hall et al. in Atmospheric Measurement Techniques.

In situ and space-based observations of the Kelud volcanic plume: The persistence of ash in the lower stratosphere. By J.-P. Vernier et al. in the Journal of Geophysical Research: Atmospheres.

Lessened response of boreal winter stratospheric polar vortex to El Niño in recent decades. By J. Hu et al. in Climate Dynamics.

The effect of representing bromine from VSLS on the simulation and evolution of Antarctic ozone. By L.D. Oman et al. in Geophysical Research Letters.

Evaluation of water vapour assimilation in the tropical upper troposphere and lower stratosphere by a chemical transport model. By S. Payra et al. in Atmospheric Measurement Techniques.

Effects of a warming Arctic. By T.G. Shepherd in Science.

Infrared limb emission measurements of aerosol in the troposphere and stratosphere. By S. Griessbach et al. in Atmospheric Measurement Techniques.

The dynamics of mesoscale winds in the upper troposphere and lower stratosphere. By J. Callies et al. in the Journal of the Atmospheric Sciences.

Uncertainty budgets of major ozone absorption cross sections used in UV remote sensing applications. By M. Weber et al. in Atmospheric Measurement Techniques.

Recent divergences in stratospheric water vapor measurements by frost point hygrometers and the Aura Microwave Limb Sounder. By D.F. Hurst et al. in Atmospheric Measurement Techniques.

Discussion papers – open for comment

Antarctic Ozone Depletion between 1960 and 1980 in Observations and Chemistry-Climate Model Simulations. By U. Langematz et al. in Atmospheric Chemistry and Physics Discussions.

A decadal satellite record of gravity wave activity in the lower stratosphere to study polar stratospheric cloud formation. By L. Hoffmann et al. in Atmospheric Chemistry and Physics Discussions.

Wave Modulation of the Extratropical Tropopause Inversion Layer. By R. Pilch Kedzierski et al. in Atmospheric Chemistry and Physics Discussions.

Evaluation and Error Apportionment of an Ensemble of Atmospheric Chemistry Transport Modelling Systems: Multi-variable Temporal and Spatial Breakdown. By E. Solazzo et al. in Atmospheric Chemistry and Physics Discussions.

31 October – 1 November, Berlin, Germany. Registration now open!

Find further information on the meeting website.

A selection of new science articles from the past week of interest to the SPARC community (a SPARC Office choice).

Poleward Transport Variability in the Northern Hemisphere during Final Stratospheric Warmings simulated by CESM(WACCM). By R. Thiéblemont et al. in the Journal of Geophysical Research: Atmospheres.

Seasonal Evolution of the QBO-Induced Wave Forcing and Circulation Anomalies in the Northern Winter Stratosphere. By I.P. White et al. in the Journal of Geophysical Research: Atmospheres.

Using a large ensemble of simulations to assess the Northern Hemisphere stratospheric dynamical response to tropical volcanic eruptions and its uncertainty. By M. Bittner et al. in Geophysical Research Letters.

20 years of ClO measurements in the Antarctic lower stratosphere. By G.E. Nedoluha et al. in Atmospheric Chemistry and Physics.

Storm track processes and the opposing influences of climate change. By T.A. Shaw et al. in Nature Geoscience.

Radiative Forcing from Anthropogenic Sulfur and Organic Emissions Reaching the Stratosphere. By P. Yu et al. in Geophysical Research Letters.

Impact of regional atmospheric cloud-radiative changes on shifts of the extratropical jet stream in response to global warming. By A. Voigt and T.A. Shaw in the Journal of Climate.

Representing the effects of stratosphere–troposphere exchange on 3-D O3 distributions in chemistry transport models using a potential vorticity-based parameterization. By J. XIng et al. in Atmospheric Chemistry and Physics.

The Impact of the Asian Summer Monsoon Circulation on the Tropopause. By Y. Wu and T.A. Shaw in the Journal of Climate.

Northern Hemisphere atmospheric blocking representation in Global Climate Models: twenty years of improvements? By P. Davinin and F. D’Andrea in the Journal of Climate.

A comprehensive estimate for loss of atmospheric carbon tetrachloride (CCl₄) to the ocean. By J.H. Butler et al. in Atmospheric Chemistry and Physics.

The interaction between atmospheric gravity waves and large-scale flows: an efficient description beyond the non-acceleration paradigm. By G. Bölöni et al. in the Journal of the Atmospheric Sciences.

Discussion papers – open for comment

The CAMS interim Reanalysis of Carbon Monoxide, Ozone and Aerosol for 2003–2015. By J. Flemming et al. in Atmospheric Chemistry and Physics Discussions.

A selection of new science articles from the past week of interest to the SPARC community (a SPARC Office choice).

Inter-model diversity of Arctic amplification caused by global warming and its relationship with the Inter-tropical Convergence Zone in CMIP5 climate models. By Y. Yim et al. in Climate Dynamics.

The robustness of mid-latitude weather pattern changes due to Arctic sea-ice loss. By H.W. Chen et al. in the Journal of Climate.

Atmospheric photochemistry at a fatty acid–coated air-water interface. By S. Rossignol et al. in Science.

Carbon monoxide climatology derived from the trajectory mapping of global MOZAIC-IAGOS data. By M.K. Osman et al. in Atmospheric Chemistry and Physics.

Simultaneous and co-located wind measurements in the middle atmosphere by lidar and rocket-borne techniques. By F.-J. Lübken et al. in Atmospheric Measurement Techniques.

Satellite observations of stratospheric hydrogen fluoride and comparisons with SLIMCAT calculations. By J.J. Harrison et al. in Atmospheric Chemistry and Physics.

Tropospheric ozone variability during the East Asian summer monsoon as observed by satellite (IASI), aircraft (MOZAIC) and ground stations. By S. Safieddine et al. in Atmospheric Chemistry and Physics.

Northern Hemisphere winter storm track trends since 1959 derived from multiple reanalysis datasets. By E.K.M. Chang and A.M.W. Yau in Climate Dynamics.

The influence of the Gulf Stream on wintertime European blocking. By C.H. O’Reilly et al. in Climate Dynamics.

The natural oscillations in stratospheric ozone observed by the GROMOS microwave radiometer at the NDACC station Bern. By L. Moreira et al. in Atmospheric Chemistry and Physics.

Effect of geomagnetic activity on the northern annular mode: QBO-dependence and the Holton-Tan relationship. By V. Maliniemi et al. in the Journal of Geophysical research: Atmospheres.

Long-term variation of stratospheric aerosols observed with lidars over Tsukuba, Japan from 1982 and Lauder, New Zealand from 1992 to 2015. By T. Sakai et al. in the Journal of Geophysical research: Atmospheres.

On instrumental errors and related correction strategies of ozonesondes: possible effect on calculated ozone trends for the nearby sites Uccle and De Bilt. By R. van Malderen et al. in Atmospheric Measurement Techniques.

WACCM-D – Improved modeling of nitric acid and active chlorine during energetic particle precipitation. By M.E. Andersson et al. in the Journal of Geophysical research: Atmospheres.

An update on the uncertainties of water vapor measurements using cryogenic frost point hygrometers. By H. Vömel et al. in Atmospheric Measurement Techniques.

Improvement of stratospheric balloon GPS positioning and the impact on gravity wave parameter estimation for the Concordiasi campaign in Antarctica. By W. Zhang et al. in the Journal of Geophysical research: Atmospheres.

The impact of changes in parameterizations of surface drag and vertical diffusion on the large-scale circulation in the Community Atmosphere Model (CAM5). By J. Lindvall et al. in Climate Dynamics.

Impact of the Asian monsoon on the extratropical lower stratosphere: trace gas observations during TACTS over Europe 2012. By S. Müller et al. in Atmospheric Chemistry and Physics.

Proposed standardized definitions for vertical resolution and uncertainty in the NDACC lidar ozone and temperature algorithms – Part 1: Vertical resolution. By T. Leblanc et al. in Atmospheric Measurement Techniques.

Proposed standardized definitions for vertical resolution and uncertainty in the NDACC lidar ozone and temperature algorithms – Part 2: Ozone DIAL uncertainty budget. By T. Leblanc et al. in Atmospheric Measurement Techniques.

Proposed standardized definitions for vertical resolution and uncertainty in the NDACC lidar ozone and temperature algorithms – Part 3: Temperature uncertainty budget. By T. Leblanc et al. in Atmospheric Measurement Techniques.

Tropical Rainfall, Rossby Waves and Regional Winter Climate Predictions. By A.A. Scaife et al. in the Quarterly Journal of the Royal Meteorological Society.

Evidence for gravity wave drag in the boundary layer of a numerical forecast model –a comparison with observations. By A. Lapworth and S.R. Osborne in the Quarterly Journal of the Royal Meteorological Society.

Discussion papers – open for comment

How Does Downward Planetary Wave Coupling Affect Polar Stratospheric Ozone in the Arctic Winter Stratosphere? By S.W. Lubis et al. in Atmospheric Chemistry and Physics Discussions.

Heterogeneous reaction of ClONO₂ with TiO₂ and SiO₂ aerosol particles: implications for stratospheric particle injection for climate engineering. By M.J. Tang et al. in Atmospheric Chemistry and Physics Discussions.

Improved GOMOS/Envisat ozone retrievals in the upper troposphere and the lower stratosphere. By V.F. Sofieva et al. in Atmospheric Measurement Techniques Discussions.

Model Sensitivity Studies of the Decrease in Atmospheric Carbon Tetrachloride. By M.P. Chipperfield et al. in Atmospheric Chemistry and Physics Discussions.

A 2-year research fellowship focusing on the assimilation of geostationary water vapour radiance data.

The position is based at Deutscher Wetterdienst DWD, Offenbach, Germany.

Find vacancy.

Find more details.

A selection of new science articles from the past week of interest to the SPARC community (a SPARC Office choice).

Which way will the circulation shift in a changing climate? Possible nonlinearity of extratropical cloud feedbacks. By N.F. Tandon and M.A. Cane in Climate Dynamics.

Investigations of the middle atmospheric thermal structure and oscillations over sub-tropical regions in the Northern and Southern Hemispheres. By S. Sharma et al. in Climate Dynamics.

Role of atmospheric chemistry in the climate impacts of stratospheric volcanic injections. By A.N. LeGrande et al. in Nature Geoscience.

A short-term negative eddy feedback on mid-latitude jet variability due to planetary wave reflection. By G. Rivière et al. in the Journal of the Atmospheric Sciences.

The relationship between age of air and the diabatic circulation of the stratosphere. By M. Linz et al. in the Journal of the Atmospheric Sciences.

The anomalous change in the QBO in 2015-16. By P.A. Newman et al. in Geophysical Research Letters.

The representation of solar cycle signals in stratospheric ozone – Part 1: A comparison of recently updated satellite observations. By A.C. Maycock et al. in Atmospheric Chemistry and Physics.

Satellite observations of middle atmosphere gravity wave absolute momentum flux and of its vertical gradient during recent stratospheric warmings. By M. Ern et al. in Atmospheric Chemistry and Physics.

A multi-wavelength classification method for polar stratospheric cloud types using infrared limb spectra. By R. Spang et al. in Atmospheric Measurement Techniques.

A probabilistic study of the return of stratospheric ozone to 1960 levels. By A. Helena Södergren et al. in Geophysical Research Letters.

Interhemispheric differences in seasonal cycles of tropospheric ozone in the marine boundary layer: observation – model comparisons. By R.G: Derwent et al. in the Journal of Geophysical Research: Atmospheres.

LOAC: a small aerosol optical counter/sizer for ground-based and balloon measurements of the size distribution and nature of atmospheric particles – Part 2: First results from balloon and unmanned aerial vehicle flights. By J.-B. Renard et al. in Atmospheric Measurement Techniques.

Glider aims to break world record — and boost climate science. By D. Butler in Nature.

Changes in the width of the tropical belt due to simple radiative forcing changes in the GeoMIP simulations. By N.A. Davis et al. in Atmospheric Chemistry and Physics.

A joint data record of tropospheric ozone from Aura-TES and MetOp-IASI. By H. Oetjen et al. in Atmospheric Chemistry and Physics.

Features of vortex split MSSWs that are problematic to forecast. By M. Taguchi in Atmospheric Science Letters.

Seasonal and inter-annual variability of lower stratospheric age of air spectra. By F. Ploeger and T. Birner in Atmospheric Chemistry and Physics.

Discussion papers – open for comment

Halogen chemistry reduces tropospheric O₃ radiative forcing. By T Sherwen et al. in Atmospheric Chemistry and Physics Discussions.

Shortwave radiative forcing and feedback to the surface by sulphate geoengineering: Analysis of the Geoengineering Model Intercomparison Project G4 scenario. By H. Kashimura et al. in Atmospheric Chemistry and Physics Discussions.

Place and dates: Berlin, Germany – 31 October to 1 November 2016
Abstract submission and registration deadline: 30 Sep 2016

Motivation and goals

In recent years the World Climate Research Program (WCRP) has identified several Grand Science Challenges (http://www.wcrp-climate.org/grand-challenges) representing areas of emphasis in scientific research for WCRP in the coming decade. Progress in these areas should lead to “actionable information” for decision makers. More broadly, WCRP supports climate science via its Core Projects, among them the SPARC project on “Stratosphere-troposphere processes and their role in climate” .

Held back-to-back with the annual meeting of the SPARC scientific steering group, this workshop tries to bring together scientists active in Grand Challenge research, in different SPARC activities, and scientists that so far have had fewer links to WCRP.

The workshop has the following aims:

1. To discuss the state of the science in the areas of Grand Challenges and SPARC themes;
2. To define improved collaborations between SPARC and the Grand Challenges;
3. To discuss the role of SPARC and Grand Challenges in WCRP priorities.

Contributions

We call for scientific contributions related to

• the Grand Challenges on “Clouds, circulation & climate sensitivity”, “Climate extremes”, “Near-term predictability”, and “Carbon feedbacks in the climate system”,

and/or

• the SPARC themes “Atmospheric dynamics and predictability”, “Chemistry and climate”, and “Long-term records for climate understanding”.

Please submit a short abstract by 30 September 2016 by email to .

Most contributions will be presented in poster format.

Confirmed invited speakers

Guy Brasseur, Andrew Charlton-Perez, Bill Collins, Dim Coumou, George Craig, Daniela Domeisen, Hella Garny, Corinna Hoose, Wolfgang Müller, Olivia Romppainen, Gabriele Stiller, Claudia Timmreck, Ted Shepherd

For more details and registration, please visit the webpage.

A selection of new science articles from the past week of interest to the SPARC community (a SPARC Office choice).

A multi-model intercomparison of halogenated very short-lived substances (TransCom-VSLS): linking oceanic emissions and tropospheric transport for a reconciled estimate of the stratospheric source gas injection of bromine. By R. Hossaini et al. in Atmospheric Chemistry and Physics.

The QBO, Gravity Waves Forced by Tropical Convection, and ENSO. By M.A. Geller et al. in the Journal of Geophysical Research: Atmospheres.

Impact of the January 2012 solar proton event on polar mesospheric clouds. By C.G. Bardeen et al. in the Journal of Geophysical Research: Atmospheres.

Simulation study for measurement of horizontal wind profiles in the polar stratosphere and mesosphere using ground-based observations of ozone and carbon monoxide lines in the 230–250 GHz region. By D.A. Newnham et al. in Atmospheric Measurement Techniques.

Upper-tropospheric CO and O₃ budget during the Asian summer monsoon. By B. Barret et al. in Atmospheric Chemistry and Physics.

Tropopause Sharpening by Data Assimilation. By R. Pilch Kedzierski in Geophysical Research Letters.

Investigating possible Arctic – midlatitude teleconnections in a linear framework. By R. Sellevold et al. in the Journal of Climate.

Convection generated high frequency gravity waves as observed by MST radar and simulated by WRF model over the Indian tropical station of Gadanki. By P. Ghosh et al. in the Quarterly Journal of the Royal Meteorological Society.

MIPAS IMK/IAA CFC-11 (CCl₃F) and CFC-12 (CCl₂F₂) measurements: accuracy, precision and long-term stability. By E. Eckert et al. in Atmospheric Measurement Techniques.

Robust response of the Amundsen Sea Low to stratospheric ozone depletion. By M.R. England et al. in Geophysical Research Letters.

Spectroscopic evidence of large aspherical β-NAT particles involved in denitrification in the December 2011 Arctic stratosphere. By W. Woiwode et al. in Atmospheric Chemistry and Physics.

Stratospheric gravity waves at Southern Hemisphere orographic hotspots: 2003–2014 AIRS/Aqua observations. By L. Hoffmann et al. in Atmospheric Chemistry and Physics.

Climate impacts of geoengineering in a delayed mitigation scenario. By S. Tilmes et al. in Geophysical Research Letters.

Asymmetry and nonlinearity of the influence of ENSO on the northern winter stratosphere. Part I: Observations. By J. Rao and R. Ren in the Journal of Geophysical Research: Atmospheres.

Asymmetry and nonlinearity of the influence of ENSO on the northern winter stratosphere. Part II: Model study with WACCM. By J. Rao and R. Ren in the Journal of Geophysical Research: Atmospheres.

Reassessing properties and radiative forcing of contrail cirrus using a climate model. By L. Bock and U. Burkhardt in the Journal of Geophysical Research: Atmospheres.

Validation of Aura MLS retrievals of temperature, water vapour and ozone in the upper troposphere and lower–middle stratosphere over the Tibetan Plateau during boreal summer. By X. Yan et al. in Atmospheric Measurement Techniques.

Regional and global temperature response to anthropogenic SO₂ emissions from China in three climate models. By M. Kasoar et al. in Atmospheric Chemistry and Physics.

A potential-vorticity-based index for the East Asian winter monsoon. By W. Huang et al. in the Journal of Geophysical Research: Atmospheres.

Discussion papers – open for comment

The major stratospheric final warming in 2016: Dispersal of vortex air and termination of Arctic chemical ozone loss. By G.L. Manney and Z.D. Lawrence in Atmospheric Chemistry and Physics Discussions.

Harmonization and Diagnostics of MIPAS ESA CH₄ and N₂O Profiles Using Data Assimilation. By Q. Errera et al. in Atmospheric Measurement Techniques Discussions.

STEFLUX, a tool for investigating stratospheric intrusions: application to two WMO/GAW global stations. By D. Putero et al. in Atmospheric Chemistry and Physics Discussions.

Introduction to the SPARC Reanalysis Intercomparison Project (S-RIP) and overview of the reanalysis systems. By M. Fujiwara et al. in Atmospheric Chemistry and Physics Discussions.

Multi-model simulations of aerosol and ozone radiative forcing for the period 1990–2015. By G. Myhre et al. in Atmospheric Chemistry and Physics Discussions.

Tropospheric observations of CFC-114 and CFC-114a with a focus on long-term trends and emissions. By J.C. Laube et al. in Atmospheric Chemistry and Physics Discussions.