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

Responses of European precipitation distributions and regimes to different blocking locations. By P.M. Sousa et al. in Climate Dynamics.

Atlantic Near-Term Climate Variability and the Role of a Resolved Gulf Stream. By L. Siqueira and B.P. Kirtman in Geophysical Research Letters.

Characteristics of gravity waves from convection and implications for their parameterization in global circulation models. By C. Stephan et al. in the Journal of the Atmospheric Sciences.

Sensitivity of resolved and parameterized surface drag to changes in resolution and parameterization. By A. van Niekerk et al. in the Quarterly Journal of the Royal Meteorological Society.

Anthropogenic forcing on the Hadley circulation in CMIP5 simulations. By L. Tao and Y. Hu in Climate Dynamics.

Characteristics of stratospheric warming events during Northern winter. By P. Maury et al. in the Journal of Geophysical research: Atmospheres.

Is climate sensitivity related to dynamical sensitivity? By K.M. Grise and L.M. Polvani in the Journal of Geophysical research: Atmospheres.

The impact of wave-mean flow interaction on the Northern Hemisphere polar vortex after tropical volcanic eruptions. By M. Bittner et al. in the Journal of Geophysical research: Atmospheres.

Discussion papers – open for comment

Emissions of Carbon Tetrachloride (CCl₄) from Europe. By F. Graziosi et al. in Atmospheric Chemistry and Physics Discussions.

Satellite observations of middle atmosphere gravity wave activity and dissipation during recent stratospheric warmings. By M. Ern et al. in Atmospheric Chemistry and Physics Discussions.

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 Discussions.

Regional and seasonal radiative forcing by perturbations to aerosol and ozone precursor emissions. By N. Bellouin et al. in Atmospheric Chemistry and Physics Discussions.

Errors induced by different approximations in handling horizontal atmospheric inhomogeneities in MIPAS/ENVISAT retrievals. By E. Castelli et al. in Atmospheric Measurement Techniques Discussions.

A contribution from the SSiRC activity

The SPARC Stratospheric Sulfur and its Role in Climate (SSiRC) activity has contributed significantly to a recent overview publication on observations of stratospheric aerosol. The article can be found here: http://onlinelibrary.wiley.com/doi/10.1002/2015RG000511/full

And was highlighted in EOS here: https://eos.org/editors-vox/blowin-in-the-wind-observing-stratospheric-aerosols and here: https://eos.org/research-spotlights/decade-progress-stratospheric-aerosol-research.

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

Decadal predictions with the HiGEM high resolution global coupled climate model: description and basic evaluation. By L.C. Shaffrey et al. in Climate Dynamics.

On the gravity wave forcing during the southern stratospheric final warming in LMDz. By A. De la Cámara et al. in the Journal of the Atmospheric Sciences.

Interannual variability of temperature in the UTLS region over Ganges–Brahmaputra–Meghna river basin based on COSMIC GNSS RO data. By K. Khandu et al. in Atmospheric Measurement Techniques.

Lagged Response of Tropical Tropospheric Temperature to Solar Ultraviolet Variations on Intraseasonal Timescales. By L.L. Hood et al. in the Journal of Geophysical Research: Atmospheres.

The Impact of Two Coupled Cirrus Microphysics-Radiation Parameterizations on the Temperature and Specific Humidity Biases in the Tropical Tropopause Layer in a Climate Model. By A.J. Baran et al. in the Journal of Climate.

Vertical momentum transports associated with moist convection and gravity waves in a minimal model of QBO-like oscillation. By E. Nishimoto et al. in the Journal of the Atmospheric Sciences.

Influence of tropical cyclones on tropospheric ozone: possible implications. By S. Shankar Das et al. in Atmospheric Chemistry and Physics.

ECMWF SSW forecast evaluation using infrasound. By P.S.M. Smets et al. in the Journal of Geophysical Research: Atmospheres.

On the link between Barents-Kara sea-ice variability and European blocking. By P. Ruggieri et al. in the Journal of Geophysical Research: Atmospheres.

Characteristics of gravity waves generated in the jet-front system in a baroclinic instability simulation. By Y.-H. Kim et al. in Atmospheric Chemistry and Physics.

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

Global distribution of deep convection reaching tropopause in one-year GPM observations. By N. Liu and C. Liu in the Journal of Geophysical Research: Atmospheres.

Influence of atmospheric waves on the formation and the maintenance of the subtropical jet during the Northern Hemisphere winter: A new method for analyzing the responses to specific forcings. By Y. Kuroda in the Journal of Geophysical Research: Atmospheres.

Connection between the midlatitude mesosphere and sudden stratospheric warmings as measured by Rayleigh-scatter lidar. By L. Sox et al. in the Journal of Geophysical Research: Atmospheres.

Impact of the Antarctic Ozone Hole on the Vertical Coupling of the Stratosphere-Mesosphere-Lower Thermosphere System. By S. Lubis et al. in the Journal of the Atmospheric Sciences.

Stratospheric temperature trends over 1979-2015 derived from combined SSU, MLS and SABER satellite observations. By W.J. Randel et al. in the Journal of Climate.

Vortex-wide chlorine activation by a mesoscale PSC event in the Arctic winter of 2009/10. By T. Wegner et al. in Atmospheric Chemistry and Physics.

Exploring atmospheric blocking with GPS radio occultation observations. By L. Brunner et al. in Atmospheric Chemistry and Physics.

Using beryllium-7 to assess cross-tropopause transport in global models. By H. Liu et al. in Atmospheric Chemistry and Physics.

Structure and Dynamics of the Quasi-Biennial Oscillation in MERRA-2. By L. Coy et al. in the Journal of Climate.

Vertical wind retrieved by airborne lidar and analysis of island induced gravity waves in combination with numerical models and in situ particle measurements. By F. Chouza et al. in Atmospheric Chemistry and Physics.

Discussion papers – open for comment

How stratospheric are deep stratospheric intrusions? − LUAMI 2008. By T. Trickl et al. in Atmospheric Chemistry and Physics Discussions.

Ozone profiles above Kiruna from two ground-based radiometers. By N.J. Ryan et al. in Atmospheric Measurement Techniques.

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

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

Karlsruhe, Germany, 26-27 October 2016

The 11^th MIPAS-IMK/IAA data user meeting will take place at KIT/IMK in Karlsruhe on 26/27 October 2016.

During this meeting, presentations on the most recent MIPAS data products and their validation will be given; data issues will be discussed. Scientific work on the basis of MIPAS-IMK/IAA data will be presented, including over-arching data-bases including MIPAS-IMK-IAA data. Beyond this, time will be allocated for possible MIPAS follow-up missions. During this meeting, you will have the possibility to present your work with MIPAS data, to discuss your specific needs with the data providers, and to make contact with other data users.

The programme committee:

• Gabriele Stiller
• Thomas von Carmann
• Manuel Lopez-Puertas
• Bernd Funke

For questions please contact the local organizing committee:

Andrea Linden and Sylvia Kellmann: mduorg [at] imk-asf.kit.edu

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

Injection of lightning-produced NO_x, water vapor, wildfire emissions, and stratospheric air to the UT/LS as observed from DC3 measurements. By H. Huntreiser et al. in the Journal of Geophysical Research: Atmospheres.

Isolating the roles of different forcing agents in global stratospheric temperature changes using model integrations with incrementally added single forcings. By V. Aquila et al. in the Journal of Geophysical Research: Atmospheres.

QBO modulation of the mesopause gravity wave momentum flux over Tierra del Fuego. By R. J. de Wit et al. in Geophysical Research Letters.

Stratospheric intrusion into the troposphere during the tropical cyclone Nilam (2012). By S.S. Das et al. in the Quarterly Journal of the Royal Meteorological Society.

Does the Madden-Julian Oscillation Modulate Stratospheric Gravity Waves? By A.C. Moss et al. in Geophysical Research Letters.

A Lagrangian description on the troposphere-to-stratosphere transport changes associated with the stratospheric water drop around the year 2000. By F. Hasebe and T. Noguchi in Atmospheric Chemistry and Physics.

Stratospheric ozone chemistry feedbacks are not critical for the determination of climate sensitivity in CESM1(WACCM). By D.R. Marsh et al. in Geophysical Research Letters.

Air parcel trajectory dispersion near the tropical tropopause. By J.W. Bergman et al. in the Journal of Geophysical Research: Atmospheres.

Troposphere-stratosphere dynamical coupling in the Southern high latitudes, and its linkage to the Amundsen Sea. By M.E. England et al. in the Journal of Geophysical Research: Atmospheres.

Stratospheric CH₄ and CO₂ profiles derived from SCIAMACHY solar occultation measurements. By S. Noël et al. in Atmospheric Measurement Techniques.

The vertical distribution of volcanic SO₂ plumes measured by IASI. By E. Carponi et al. in Atmospheric Chemistry and Physics.

Variability of water vapour in the Arctic stratosphere. By L. Thölix et al. in Atmospheric Chemistry and Physics.

The contribution of ozone to future stratospheric temperature trends. By A.C. Maycock in Geophysical Research Letters.

Discussion papers – open for comment

An assessment of the climatological representativeness of IAGOS-CARIBIC trace gas measurements using EMAC model simulations. By J. Eckstein et al. in Atmospheric Chemistry and Physics Discussions.

20 Years of ClO Measurements in the Antarctic Lower Stratosphere. By G.E. Nedoluha et al. in Atmospheric Chemistry and Physics Discussions.

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 Discussions.

Observational evidences of the influences of tropospheric subtropical and midlatitude stratospheric westerly jets on the equatorial stratospheric intraseasonal oscillations. By G. Karthick Kumar Reddy et al. in Atmospheric Chemistry and Physics Discussions.

Effects of polar stratospheric clouds in the Nimbus-7 LIMS version 6 data set. By E. Remsberg and V. Lynn Harvey in Atmospheric Measurement Techniques Discussions.

Reunion Island, 28 November – 3 December 2016

The Maïdo Observatory Summer School (MOSS) will focus on troposphere‐stratosphere composition and dynamics. The summer school will take place on Reunion Island, a southern tropical site (21°S, 55°E), where atmospheric observations and research activities have been developing since the early 1990s.

The MOSS is intended to further develop understanding of monitoring techniques, processes and changes in the Earth’s atmosphere (troposphere and stratosphere) with emphasis on dynamics, long‐term evolution of atmospheric composition, and climate change. The academic activities will be based on courses and training in accordance with SPARC (Stratosphere‐ troposphere Processes And their Role in Climate) activities and with its strategy in terms of capacity development. SPARC is a core project of the World Climate Research Programme (WCRP).

The School is scheduled for 6‐days of coursework and is open to PhD students and early career researchers in the field of instrumentation and atmospheric sciences.

Applications will be accepted from:

• students registered in a doctoral programme;
• postdoctoral and young researchers from public or private laboratories;
• any other scientists or engineers from public or private laboratories.

Registration fees for MOSS 2016:

• For PhD students (with official justification): 400 euros
• For researchers or engineers from universities or public research institutes: 700 euros
• For researchers / engineers from private or industrial organizations: please contact the organizers: moss@univ‐reunion.fr

Registration fees are intended to cover: accommodation in the Village Corail centre at Ermitage, Saint‐Gilles, from Sunday 27 November to Sunday 4 December 2016; meals (breakfast, lunch and coffee‐breaks, from Monday 28 Nov. to Saturday 3 Dec. 2016, plus a gala dinner); transportation: special shuttle bus from/to the airport and between the hotel (Village Corail) and the Maïdo Observatory.

A small number of grants to cover travel and registration costs are available.

See the summer school website for further information: http://lacy.univ-reunion.fr/formation/summer-school/

Manchester, UK, 17-19 October 2016

The 2016 IAGOS Scientific Symposium on Atmospheric Composition will take place from 17-19 October in Manchester, UK. The goal of the symposium is to present and discuss new scientific research in the area of atmospheric composition, processes, and trends based on over 20 years of repetitive commercial aircraft observations by IAGOS-CARIBIC and IAGOS-CORE, with a view to

highlighting new findings and to promote use of this capability across the scientific community. There will be plenary sessions with 15-minute talks and a poster session. Each session will be introduced by an invited speaker highlighting key scientific questions which IAGOS airborne observational databases have or can contribute to.

The scientific symposium will cover the following research areas:

• Aerosols and Climate
• UTLS Dynamics, Chemical Composition & Trends
• Reactive Trace Gases
• Water Vapour Clouds & Radiation
• Evaluation & validation of satellite and surface remote sensing
• Long-range transport of air pollutants
• New technical developments for airborne monitoring

More information can be found on the conference website.

The IGAC 2016 conference will:

• Highlight cutting edge scientific research on atmospheric chemistry.
• Foster international collaborations to address the most pressing global change and sustainability issues through scientific research.
• Engage early career scientist to cultivate the next generation of international researchers.
• Highlight scientists and scientific research from developing and emerging economies.
• Promote networking between scientists, policy makers and industry leaders.

The IGAC 2016 Science Conference is a high profile event that will attract approximately 600 top international scientists, industry leaders, early career scientists from around the world, and representatives from all of the major U.S. funding agencies. The program will include cutting edge results from international atmospheric chemistry research activities.

Abstract submissions extended until 11 April 2016.

See the conference website for more information: www.igac2016.org

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

Stratospheric aerosol – Observations, processes, and impact on climate. By S. Kremser et al. in Reviews of Geophysics.

Global stratospheric measurements of the isotopologues of methane from the Atmospheric Chemistry Experiment Fourier transform spectrometer. By E.M. Buzan et al. in Atmospheric Measurement Techniques.

Intercomparison of in situ water vapor balloon-borne measurements from Pico-SDLA H₂O and FLASH-B in the tropical UTLS. By M. Ghysels et al. in Atmospheric Measurement Techniques.

The stratospheric pathway for Arctic impacts on mid-latitude climate. By T. Nakamura et al. in Geophysical Research Letters.

Lagrangian temperature and vertical velocity fluctuations due to gravity waves in the lower stratosphere. By A. Podglajen et al. in Geophysical Research Letters.

Progress towards high-resolution, real-time radiosonde reports. By B. Ingleby et al. in the Bulletin of the American Meteorological Society.

The Influence of the Madden-Julian Oscillation on Northern Hemisphere Winter Blocking. By S.A. Henderson et al. in the Bulletin of the American Meteorological Society.

Maryland Summer Stratospheric Intrusions. By L.E. Ott et al. in the Journal of Geophysical Research: Atmospheres.

Detection of trends in surface ozone in the presence of climate variability. By E.A. Barnes et al. in the Journal of Geophysical Research: Atmospheres.

Predictability of the Stratospheric Polar Vortex Breakdown: An Ensemble Reforecast Experiment for the Splitting Event in January 2009. By S. Noguchi et al. in the Journal of Geophysical Research: Atmospheres.

Quantifying Isentropic Stratosphere-Troposphere Exchange (STE) of Ozone. By H. Yang et al. in the Journal of Geophysical Research: Atmospheres.

Energetic particle precipitation: a major driver of the ozone budget in the Antarctic upper stratosphere. By A. Damiani et al. in Geophysical Research Letters.

Upper tropospheric humidity changes under constant relative humidity. By K. Gierens and K. Eleftheratos in Atmospheric Chemistry and Physics.

On the Composite Response of the MLT to Major Sudden Stratospheric Warming Events with Elevated Stratopause. By V. Limpasuvan et al. in the Journal of Geophysical Research: Atmospheres.

Highly significant responses to anthropogenic forcings of the midlatitude jet in the Southern Hemisphere. By A. Solomon and L.M. Polvani in the Journal of Climate.

Stratospheric ozone changes under solar geoengineering: implications for UV exposure and air quality. By P.J. Nowack et al. in Atmospheric Chemistry and Physics.

Discussion papers – open for comment

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

Strong modification of stratospheric ozone forcing by cloud and sea ice adjustments. By Y. Xia et al. in Atmospheric Chemistry and Physics Discussions.

A semi-empirical model for mesospheric and stratospheric NO_y produced by energetic particle precipitation. By B. Funke et al. in Atmospheric Chemistry and Physics Discussions.