The call for nominations to CLIVAR Scientific Steering Group (SSG) and CLIVAR panels is now open. The call for nominations to CLIVAR panels and groups is now open. Deadline for nominations for appointments starting in 2017 (and 2018 for the SSG) is 20 July 2016, and nominations can be submitted online here.

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

Inter-comparison of stratospheric mean-meridional circulation and eddy mixing among six reanalysis data sets. By K. Miyazaki et al. in Atmospheric Chemistry and Physics.

ML-CIRRUS – The airborne experiment on natural cirrus and contrail cirrus with the high-altitude long-range research aircraft HALO. By C. Voigt et al. in the Bulletin of the American Meteorological Society.

Response of lightning NO_x emissions and ozone production to climate change: Insights from the Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP). By D.L. Finney et al. in Geophysical Research Letters.

Climate change reduces warming potential of nitrous oxide by an enhanced Brewer-Dobson circulation. By D. Kracher et al. in Geophysical Research Letters.

Ozone variability in the troposphere and the stratosphere from the first 6 years of IASI observations (2008-2013). By C. Wespes et al. in Atmospheric Chemistry and Physics.

Evaluation of UTLS carbon monoxide simulations in GMI and GEOS-Chem chemical transport models using Aura MLS observations. By L. Huang et al. in Atmospheric Chemistry and Physics.

Climatology and ENSO-related interannual variability of gravity waves in the southern hemisphere subtropical stratosphere revealed by high-resolution AIRS observations. By K. Sato et al. in the Journal of Geophysical Research.

Midlatitude cloud shifts, their primary link to the Hadley cell, and their diverse radiative effects. By G. Tselioudis et al. in Geophysical Research Letters.

An idealized stratospheric model useful for understanding differences between long-lived trace gas measurements and global chemistry-climate model output. By E.A. Ray et al. in the Journal of Geophysical Research.

Reduction of climate sensitivity to solar forcing due to stratospheric ozone feedback. By G. Chiodo and L.M. Polvani in the Journal of Climate.

Transport vs. energetic particle precipitation: Northern polar stratospheric NO_x and ozone in January-March 2012. By S.-M. Päivärinta et al. in the Journal of Geophysical Research.

Kinematic and diabatic vertical velocity climatologies from a chemistry climate model. By A.M. Hoppe et al. in Atmospheric Chemistry and Physics.

Stratospheric age of air variations between 1600-2100. By S. Muthers et al. in Geophysical Research Letters.

The airborne mass spectrometer AIMS – Part 2: Measurements of trace gases with stratospheric or tropospheric origin in the UTLS. By T. Jurkat et al. in Atmospheric Measurement Techniques.

Discussion papers – open for comment

Projection of North Atlantic Oscillation and its effect on tracer transport. By S. Bacer et al. in Atmospheric Chemistry and Physics Discussions.

A laser-induced fluorescence instrument for aircraft measurements of sulfur dioxide in the upper troposphere and lower stratosphere. By A.W. Rollins et al. in Atmospheric Measurement Techniques Discussions.

The Stratospheric Water and Ozone Satellite Homogenized (SWOOSH) database: A long-term database for climate studies. By S.M. Davis et al. in Earth System Science Data Discussions.

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

Validation of ACE-FTS version 3.5 NO_y species profiles using correlative satellite measurements. By P.E. Sheese et al. in Atmospheric Measurement Techniques Discussions.

Changes in the Width of the Tropical Belt due to Simple Radiative Forcing Changes in the GeoMIP Simulations. By N. Davis et al. in Atmospheric Chemistry and Physics Discussions.

Model – TCCON comparisons of column-averaged methane with a focus on the stratosphere. By A. Ostler et al. in Atmospheric Measurement Techniques Discussions.

Seasonal Variability of Stratospheric Methane: Implications for Constraining Tropospheric Methane Budgets Using Total Column Observations. By K.M. Saad et al. in Atmospheric Chemistry and Physics Discussions.

Stratospheric gravity waves at southern hemisphere orographic hotspots: 2003-2014 AIRS/Aqua observations. By L. Hoffmann et al. in Atmospheric Chemistry and Physics Discussions.

Role of vertical and horizontal mixing in the tape recorder signal near the tropical tropopause. By A.A. Granville and T. Birner in Atmospheric Chemistry and Physics Discussions.

Case Studies of the Impact of Orbital Sampling on Stratospheric Trend Detection and Derivation of Tropical Vertical Velocities: Solar Occultation versus Limb Emission Sounding. By L.F. Millán et al. in Atmospheric Chemistry and Physics Discussions.

A comparison of very short-lived halocarbon (VSLS) and DMS aircraft measurements in the Tropical West Pacific from CAST, ATTREX and CONTRAST. By S.J. Andrews et al. in Atmospheric Measurement Techniques Discussions.

Phosgene in the UTLS: seasonal and latitudinal variations from MIPAS observations. By M. Valeri et al. in Atmospheric Measurement Techniques Discussions.

The SPARC Annual Report 2015 summarises the project’s activities of the past year as well as plans for the upcoming months. You can download it here.

The recording of the individual presentations and discussions of this event can now be called up at:

http://www.video.ethz.ch/content/vp/en/events/2016/ozone.html

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.