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

Effects of mixing on resolved and unresolved scales on stratospheric age of air. By S. Dietmüller et al. in Atmospheric Chemistry and Physics.

New AIM/CIPS Global Observations of Gravity Waves near 50-55 km. By C.E. Randall et al. in Geophysical Research Letters.

Sensitivity of Sudden Stratospheric Warmings to Previous Stratospheric Conditions. By A. de la Camara et al. in the Journal of the Atmospheric Sciences.

Improved consistency of climate projections over Europe after accounting for atmospheric circulation variability. By C. Saffioti et al. in the Journal of Climate.

Observations and fine-scale model simulations of gravity waves over Davis, East Antarctica (69S, 78E). By S.P. Alexander et al. in the Journal of Geophysical Research: Atmospheres.

Discussion papers – open for comment

Multi-model Impacts of Climate Change on Pollution Transport from Global Emission Source Regions. By R.M. Doherty et al. in Atmospheric Chemistry and Physics Discussions.

Nonlinear response of tropical lower stratospheric temperature and water vapor to ENSO. By C.I. Garfinkel et al. in Atmospheric Chemistry and Physics Discussions.

Space-Time Variability of UTLS Chemical Distribution in the Asian Summer Monsoon Viewed by Limb and Nadir Satellite Sensors. By J. Luo et al. in Atmospheric Chemistry and Physics Discussions.

Dynamics and composition of the Asian summer monsoon anticyclone. By K.-D. Gottschaldt 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).

Efficient transport of tropospheric aerosol into the stratosphere via the Asian summer monsoon anticyclone. By P. Yu et al. in the Proceedings of the National Academy of Sciences of the United States of America.

On the Similarity of Lower-Stratospheric Potential Vorticity Dipoles above Tropical and Midlatitude Deep Convection. By M.H. Hitchman and S.M. Rowe in the Journal of the Atmospheric Sciences.

Influence of Stratospheric Air Masses on Radiotracers and Ozone over the Central Mediterranean. By E. Brattich et al. in the Journal of Geophysical Research: Atmospheres.

Hemispheric differences in the annual cycle of tropical lower stratosphere transport and tracers. By O.V. Tweedy et al. in the Journal of Geophysical Research: Atmospheres.

Causes of differences in model and satellite tropospheric warming rates. By B.D. Santer et al. in Nature Geoscience.

Impact of the Montreal Protocol on Antarctic Surface Mass Balance and Implications for Global Sea-Level Rise. By M. Previdi and L.M. Polvani in the Journal of Climate.

On the relative importance of radiative and dynamical heating for tropical tropopause temperatures. By T. Birner and E. Charlesworth in the Journal of Geophysical Research: Atmospheres.

An evaluation of gravity waves and gravity wave sources in the Southern Hemisphere in a 7-km global climate simulation. By L.A. Holt et al. in the Quarterly Journal of the Royal Meteorological Society.

Sensitivity of gravity wave fluxes to interannual variations in tropical convection and zonal wind. By M.J. Alexander et al. in the Journal of Atmospheric Sciences.

Discussion papers – open for comment

MIPAS observations of volcanic sulphate aerosol and sulphur dioxide in the stratosphere. By A. Günther et al. in Atmospheric Chemistry and Physics Discussions.

Volcanic stratospheric sulphur injections and aerosol optical depth from 500 BCE to 1900 CE. By M. Toohey and M. Sigl in Earth System Science Data Discussions.

Assessing the ability to derive rates of polar middle-atmospheric descent using trace gas measurements from remote sensors. By N.J. Ryan et al. in Atmospheric Chemistry and Physics Discussions.

Long-range isentropic transport of stratospheric aerosols over Southern Hemisphere following the Calbuco eruption in April 2015. By N. Bègue et al. in Atmospheric Chemistry and Physics Discussions.

NOy production, ozone loss and changes in net radiative heating due to energetic particle precipitation in 2002–2010. By M. Sinnhuber et al. in Atmospheric Chemistry and Physics Discussions.

9-14 October, Kyoto, Japan

Important dates:

Registration deadline:7 July 2017

Abstract Decision: 14 July 2017

The objective of the joint SPARC Dynamics & Observations Workshop is to gather researchers to better understand the processes and patterns coupling the tropical troposphere, stratosphere and beyond.

Focus will be on the interplay between large-scale phenomena such as the Madden Julian Oscillation, monsoons, tropical cyclones and the Quasi-Biennial Oscillation, their association with moist convection and its large-scale organisation, as well as their representation within simple and complex models.

The main activities of the joint meeting will include:

• Reporting results from the joint model experiments and analyses that were planned at the 2015 & 2016 SPARC QBOi workshops;
• Exploring opportunities for improved awareness, dissemination and exploitation of existing networks of high resolution radiosonde data; and
• Further the science of stratosphere-troposphere coupling within the tropics.

The Workshop will be held from 9-14 October 2017 in the Maskawa Building for Education and Research at Kyoto University.

The Workshop is an joint between the SPARC QBOi (Quasi-Biennial Oscillation Initiative), FISAPS (Fine Scale Atmospheric Processes and Structures), and SATIO-TCS (Stratospheric And Tropospheric Influences On Tropical Convective Systems) activities.

Organizers:
James Anstey, Neal Butchart, Marv Geller, Kevin Hamilton, Scott Osprey, Shigeo Yoden

Please prepare your abstract and register it on the registration page.

Find second circular.

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

Response of trace gases to the disrupted 2015–2016 quasi-biennial oscillation. By O.V. Tweedy et al. in Atmospheric Chemistry and Physics.

Future changes in the ozone quasi-biennial oscillation with increasing GHGs and ozone recovery in CCMI simulations. By H. Naoe et al. in the Journal of Climate.

An inter-comparison of multi-decadal observational and reanalysis data sets for global total ozone trends and variability analysis. By K. Bai et al. in the Journal of Geophysical Research: Atmospheres.

Radiative and climate effects of stratospheric sulfur geoengineering using seasonally varying injection areas. By A. Laakso et al. in Atmospheric Chemistry and Physics.

Dependence of model-simulated response to ozone depletion on stratospheric polar vortex climatology. By P. Lin et al. in Geophysical Research Letters.

Tropical circulation and precipitation response to ozone depletion and recovery. By S. Brönnimann et al. in Environmental Research Letters.

Mean age of stratospheric air derived from AirCore observations. By A. Engel et al. in Atmospheric Chemistry and Physics.

Technical note: Fu–Liou–Gu and Corti–Peter model performance evaluation for radiative retrievals from cirrus clouds. By S. Lolli et al. in Atmospheric Chemistry and Physics.

Quantifying pollution transport from the Asian monsoon anticyclone into the lower stratosphere. By F. Ploeger et al. in Atmospheric Chemistry and Physics.

Stratospheric Response to the 11-year Solar Cycle: Breaking Planetary Waves, Internal Reflection and Resonance. By H. Lu et al. in the Journal of Climate.

Untangling the annual cycle of the tropical tropopause layer with an idealized moist model. By M. Jucker and E.P. Gerber in the Journal of Climate.

Arctic stratosphere dynamical response to global warming. By A.Y. Karpechko and E. Manzini in the Journal of Climate.

Discussion papers – open for comment

Nadir ozone profile retrieval from SCIAMACHY and its application to the Antarctic ozone hole in the period 2003–2011. By S. Shah et al. in Atmospheric Measurement Techniques Discussions.

Temporal variability of tidal and gravity waves during a record long 10 day continuous lidar sounding. By K. Baumgartner et al. in Atmospheric Chemistry and Physics Discussions.

Deadline for travel support applications: 30 June 2017
Abstract submission and registration deadline: 31 August 2017

The 2017 S-RIP and the 13^th SPARC Data Assimilation workshop will be held at the ECMWF (Reading, UK) from 23-27 October 2017.

This year, S-RIP will start the week (Monday-Wednesday) followed by SPARC-DA (Wednesday-Friday), with a joint S-RIP-DA session on Wednesday.

Find more details on the website and in the 1^st circular.

Abstracts should be submitted before 16 June for this workshop to be held at ESA/ESTEC, Noordwijk, The Netherlands, on 9-10 October 2017.

Find website of the workshop "HAPS4ESA Towards an ESA Stratospheric High Altitude Pseudo-Satellites (HAPS) Programme for Earth Observation, Telecommunications and Navigation".

As part of the initiative Make Our Planet Great Again, attractive funding is available for climate research conducted in France.

The President of France, Emmanuel Macron, is inviting "every responsible citizen" to come and work in France in order to Make Our Planet Great Again.

Find more information on the initiative; find an article published in Science.

This 10-minute survey set up by the University of East Anglia Tyndall Centre for Climate Change Research will be used to develop guidance to support the communication of climate change data.

Find online survey.

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

Stratospheric ozone over the United States in summer linked to observations of convection and temperature via chlorine and bromine catalysis. By J.G. Anderson et al. in the Proceedings of the National Academy of Sciences of the United States of America.

The Asia-Pacific’s role in the emerging solar geoengineering debate. By M. Sugiyama et al. in Climatic Change.

Methods to homogenize electrochemical concentration cell (ECC) ozonesonde measurements across changes in sensing solution concentration or ozonesonde manufacturer. By T. Deshler et al. in Atmospheric Measurement Techniques.

Extending methane profiles from aircraft into the stratosphere for satellite total column validation using the ECMWF C-IFS and TOMCAT/SLIMCAT 3-D model. By S. Verma et al. in Atmospheric Chemistry and Physics.

Variations of Global Gravity Waves Derived From 14 Years of SABER Temperature Observations. By X. Liu et al. in the Journal of Geophysical Research: Atmospheres.

The relationship between lower-stratospheric ozone at southern high latitudes and sea surface temperature in the East Asian marginal seas in austral spring. By W. Tian et al. in Atmospheric Chemistry and Physics.

Delivery of halogenated very short-lived substances from the west Indian Ocean to the stratosphere during the Asian summer monsoon. By A. Fiehn et al. in Atmospheric Chemistry and Physics.

The modulation of stationary waves, and their response to climate change, by parameterized orographic drag. By A. van Niekerk et al. in the Journal of the Atmospheric Sciences.

Discussion papers – open for comment

A growing threat to the ozone layer from short-lived anthropogenic chlorocarbons. By D.E. Oram et al. in Atmospheric Chemistry and Physics Discussions.

Disentangling fast and slow responses of the East Asian summer monsoon to reflecting and absorbing aerosol forcings. By Z. Wang et al. in Atmospheric Chemistry and Physics Discussions.

Intercomparison of stratospheric temperature profiles from a ground-based microwave radiometer with other techniques. By F. Navas-Guzmán et al. in Atmospheric Chemistry and Physics Discussions.

Estimating Uncertainties in the SBUV Version 8.6 Merged Profile Ozone Dataset. By S.M. Frith et al. in Atmospheric Chemistry and Physics Discussions.

Two decades of in-situ temperature measurements in the upper troposphere and lowermost stratosphere from IAGOS long-term routine observation. By F. Berkes et al. in Atmospheric Chemistry and Physics Discussions.

Denitrification, dehydration and ozone loss during the Arctic winter 2015/2016. By F. Khosrawi 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).

Large anomalies in lower stratospheric water vapour and ice during the 2015–2016 El Niño. By M.A. Avery et al. in Nature Geoscience.

Quasi-12 h inertia–gravity waves in the lower mesosphere observed by the PANSY radar at Syowa Station (39.6° E, 69.0° S). By R. Shibuya et al. in Atmospheric Chemistry and Physics.

Surface ozone in the Southern Hemisphere: 20 years of data from a site with a unique setting in El Tololo, Chile. By J.G. Anet et al. in Atmospheric Chemistry and Physics.

Recent Trends in Extreme Precipitation and Temperature over Southeastern South America: The Dominant Role of Stratospheric Ozone Depletion in CESM Large Ensemble. By Y. Wu and L.M. Polvani in the Journal of Climate.

Anthropogenic aerosol effects on East Asian winter monsoon: The role of black carbon induced Tibetan Plateau warming. By Y. Jiang et al. in the Journal of Geophysical Research: Atmospheres.

Atmospheric science: The self-cleansing ability of prehistoric air. By M.I. Hegglin in Nature.

Physical Processes Controlling the Spatial Distributions of Relative Humidity in the Tropical Tropopause Layer Over the Pacific. By E.J. Jensen et al. in the Journal of Geophysical Research: Atmospheres.

Thermodynamic and dynamic responses of the hydrological cycle to solar dimming. By J.E. Smyth et al. in Atmospheric Chemistry and Physics.

Non-stationarity in Southern Hemisphere climate variability associated with the seasonal breakdown of the stratospheric polar vortex. By N.J. Byrne et al. in the Journal of Climate.

Discussion papers – open for comment

Changing transport processes in the stratosphere by radiative heating of sulfate aerosols. By U. Niemeier and H. Schmidt in Atmospheric Chemistry and Physics Discussions.

The Evolution of Zonally Asymmetric Austral Ozone in a Chemistry Climate Model. By F. Dennison et al. in Atmospheric Chemistry and Physics Discussions.

Sensitivity of surface temperature to radiative forcing by cirrus and contrails in a radiative-convective model. By U. Schumann and B. Mayer in Atmospheric Chemistry and Physics Discussions.

Hemispheric asymmetry in stratospheric NO₂ trends. By M. Yela et al. in Atmospheric Chemistry and Physics Discussions.

Atmospheric Carbonyl Sulphide (OCS) measured remotely by FTIR solar absorption spectrometry. By G.C. Toon et al. in Atmospheric Chemistry and Physics Discussions.

Diagnosis of Local Gravity Wave Properties during a Sudden Stratospheric Warming. By L. Schoon and C. Zülicke in Atmospheric Chemistry and Physics Discussions.

The representation of solar cycle signals in stratospheric ozone. Part II: Analysis of global models. By A.C. Maycock et al. in Atmospheric Chemistry and Physics Discussions.

Multi-decadal Records of Stratospheric Composition and their Relationship to Stratospheric Circulation Change. By A.R. Douglass et al. in Atmospheric Chemistry and Physics Discussions.