Submissions to this joint ACP/AMT/ESSD/GMD special CCMI-issue are now being accepted.

Submit article.

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

Atmospheric seasonal forecasts of the 20^th Century: multi-decadal variability in predictive skill of the winter North Atlantic Oscillation (NAO) and their potential value for extreme event attribution. By A. Weisheimer et al. in the Quarterly Journal of the Royal Meteorological Society.

Monsoon circulations and tropical heterogeneous chlorine chemistry in the stratosphere. By S. Solomon et al. in Geophysical Research Letters.

The Influence of Ozone Forcing on Blocking in the Southern Hemisphere. By F. Dennison et al. in the Journal of Geophysical Research: Atmospheres.

Long-range transport pathways of tropospheric source gases originating in Asia into the northern lower stratosphere during the Asian monsoon season 2012. By B. Vögel et al. in Atmospheric Chemistry and Physics.

Harmonisation and diagnostics of MIPAS ESA CH₄ and N₂O profiles using data assimilation. By Q. Errera et al. in Atmospheric Measurement Techniques.

Impact of interactive chemistry of stratospheric ozone on southern hemisphere paleoclimate simulation. By S. Noda et al. in the Journal of Geophysical Research: Atmospheres.

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.

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

Reduced Southern Hemispheric circulation response to quadrupled CO₂ due to stratospheric ozone feedback. By G. Chiodo and L.M. Polvani in Geophysical Research Letters.

Global atmospheric teleconnections during Dansgaard–Oeschger events. By B.R. Markle et al. in Nature Geoscience.

Stratospheric solar geoengineering without ozone loss. By D.W. Keith et al. in Proceedings of the National Academy of Sciences of the United States of America.

Initialization shock in decadal hindcasts due to errors in wind stress over the tropical Pacific. By H. Pohlmann et al. in Climate Dynamics.

Poleward eddy heat flux anomalies associated with recent Arctic sea-ice loss. By K. Hoshi et al. in Geophysical Research Letters.

A connection from Arctic stratospheric ozone to El Niño-Southern oscillation. By F. Xie et al. in Environmental Research Letters.

Multidecadal variations of the effects of the Quasi-Biennial Oscillation on the climate system. By S. Brönnimann et al. in Atmospheric Chemistry and Physics.

Directional gravity wave momentum fluxes in the stratosphere derived from high resolution AIRS temperature data. By M. Ern et al. in Geophysical Research Letters.

An upper-branch Brewer–Dobson circulation index for attribution of stratospheric variability and improved ozone and temperature trend analysis. By W.T. Ball et al. in Atmospheric Chemistry and Physics.

Stratospheric variability contributed to and sustained the recent hiatus in Eurasian winter warming. By C.I. Garfinkel et al. in Geophysical Research Letters.

Discussion papers – open for comment

HEPPA-II model-measurement intercomparison project: EPP indirect effects during the dynamically perturbed NH winter 2008–2009. By B. Funke et al. in Atmospheric Chemistry and Physics Discussions.

Widespread persistent polar stratospheric ice clouds in the Arctic. By C. Voigt et al. in Atmospheric Chemistry and Physics Discussions.

Changing trends and emissions of hydrochlorofluorocarbons and their hydrofluorocarbon replacements. By P.G. Simmonds et al. in Atmospheric Chemistry and Physics Discussions.

The 9th International Atmospheric Limb Workshop will be hosted by the Atmospheric Remote Sensing Group from the University of Saskatchewan at the Sheraton Cavalier hotel in downtown Saskatoon.

Over the course of the three day meeting, oral and poster sessions will cover many aspects of both measurements techniques and scientific applications of atmospheric limb sounding. Presentations will be dedicated to past, current and future limb missions, sub-orbital instrumentation, and scientific studies of processes and trends in the stratosphere, mesosphere, and the UTLS. We will also hear from representatives of several space agencies and international programmes.

Abstract submission deadline: 15 March 2017

Early-bird registration deadline: 12 May 2017

Find more information and register at: http://limb2017.usask.ca

Registration and abstract submission deadline: 15 March 2017

The 3^rd ACAM Workshop, to be held at Jinan University, Guangzhou, China, 5-9 June 2017, is now accepting registrations and abstract submissions.

Applications are also being accepted for the 2^nd ACAM Training School, which takes place immediately following the workshop.

Please go to the meeting website for instructions:
https://www2.acom.ucar.edu/acam/guangzhou-2017

It is important to follow the instructions carefully as you go through the process.

Specific instructions are given for:

• Workshop registration
• Abstract submission (registration required)
• Training school application (open to early career scientists; workshop attendance is required)
• Travel support application

Special note for travel support:

• Please do not apply for travel support unless it is absolutely necessary for you to attend the workshop.
• Preference for travel support will be given to
  • Applicants from emerging scientific communities to promote capacity building
  • Applicants who are making significant contribution to ACAM science and working group activities as verified by the working group leaders.

We look forward to building on the success of the first two workshops and having strong participation in this important scientific and community building event.

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

Adapted ECC ozonesonde for long-duration flights aboard boundary-layer pressurised balloons. By F. Gheusi et al. in Atmospheric Measurement Techniques.

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

Multiple subtropical stratospheric intrusions over Reunion Island : observational, lagrangian and eulerian numerical modeling approaches. By H. Vérèmes et al. in the Journal of Geophysical research: Atmospheres.

Tropospheric Transport Differences Between Models Using the Same Large-Scale Meteorological Fields. By C. Orbe et al. in Geophysical Research Letters.

When Stratospheric Ozone Hits Ground-level Regulation – Exceptional Events in Wyoming. By B. Kaldunski et al. in the Bulletin of the American Meteorological Society.

Stratospheric control of Madden Julian Oscillation. By S.-W. Son et al in the Journal of Climate.

Impact of Atmospheric Blocking on South America in Austral Summer. By R.R. Rodrigues and T. Woollings in the Journal of Climate.

Recent advances in satellite data rescue. By P. Poli et al. in the Bulletin of the American Meteorological Society.

Characterising tropospheric O₃ and CO around Frankfurt over the period 1994–2012 based on MOZAIC–IAGOS aircraft measurements. By H. Petetin et al. in Atmospheric Chemistry and Physics.

Interannual variations of early winter Antarctic polar stratospheric cloud formation and nitric acid observed by CALIOP and MLS. By A. Lambert et al. in Atmospheric Chemistry and Physics.

Discussion papers – open for comment

Modelling the Inorganic Bromine Partitioning in the Tropical Tropopause over the Pacific Ocean. By M.A. Navarro et al. in Atmospheric Chemistry and Physics Discussions.

Registration deadline: 25 December 2016

The Global Atmosphere Watch Programme (GAW) of the World Meteorological Organization (WMO) is organizing its next symposium on 10-13 April 2017 at the WMO Office in Geneva.

GAW symposia are organized every 4 years in order to gather the GAW research and observational community and existing/potential partners to reassess the programme and discuss issues of importance for a successful future.

This next symposium will take place in the context of a new GAW Implementation Plan for 2016-2023 (GAW IP), which will be published before the end of 2016.

The objectives of the 2017 GAW Symposium are to:

• Assess the state of the underpinning science;
• Review programme elements in the context of the new GAW IP;
• Develop work plans with clear outcomes and timelines for implementing activities in the new GAW IP;
• Foster further collaborations within and external to GAW;
• Enhance GAW’s capacity to increase its relevance to partners/clients and to strengthen support for its activities;
• Demonstrate success of the GAW programme.

There is no registration fee.

For further details and registration visit the website.

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

The extraordinarily strong and cold polar vortex in the early northern winter 2015/16. By V. Matthias et al. in Geophysical Research Letters.

Movement, drivers and bimodality of the South Asian High. By M. Nützel et al. in Atmospheric Chemistry and Physics.

Distinguishing stratospheric sudden warmings from ENSO as key drivers of wintertime climate variability over the North Atlantic and Eurasia. By L.M. Polvani et al. in the Journal of Climate.

A case study of long gravity wave crests in noctilucent clouds and their origin in the upper tropospheric jet stream. By P. Dalin et al. in the Journal of Geophysical research: Atmospheres.

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.

Discussion papers – open for comment

Trace gas composition in the Asian summer monsoon anticyclone: A case study based on aircraft observations and model simulations. By K.D. Gottschaldt et al. in Atmospheric Chemistry and Physics Discussions.

Quantifying the vertical transport of CHBr₃ and CH₂Br₂ over the Western Pacific. By R. Butler et al. in Atmospheric Chemistry and Physics Discussions.

Changes to the chemical state of the northern hemisphere atmosphere during the second half of the twentieth century. By M.J. Newland et al. in Atmospheric Chemistry and Physics Discussions.

An Atlantic streamer in stratospheric ozone observations and SD-WACCM simulation data. By K. Hocke et al. in Atmospheric Chemistry and Physics Discussions.

The Scripps Institution of Oceanography (USA) and the National Astronomical Research Institute of Thailand (Thailand) offer exciting vacancies for Postdocs.

Find vacancies.

Let WCRP know what you think!

Communication has a direct impact on how successful we are in implementing our plans and conducting our activities. WCRP are conducting a community-wide survey to gauge where they can effectively improve communication across the programme. Now’s your chance to participate!

Find the survey here: www.wcrp-climate.org/wcrp-communication-survey

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

Internal atmospheric noise characteristics in twentieth century coupled atmosphere–ocean model simulations. By I. Colfescu and E.K. Schneider in Climate Dynamics.

A multi-system view of wintertime NAO seasonal predictions. By P.J. Athanasiadis et al in the Journal of Climate.

First detection of ammonia (NH₃) in the Asian summer monsoon upper troposphere. By M. Höpfner et al. in Atmospheric Chemistry and Physics.

No fudging on geoengineering. By A. Parker and O. Geden in Nature Geoscience.

The vital need for a climate information system. By K.E. Trenberth et al. in Nature Climate Change.

Persistent shift of the Arctic polar vortex towards the Eurasian continent in recent decades. By J. Zhang et al. in Nature Climate Change.

Assessing the sensitivity of the hydroxyl radical to model biases in composition and temperature using a single-column photochemical model for Lauder, New Zealand. By L. Lopez-Comi et al. in Atmospheric Chemistry and Physics.

Direct inversion of circulation and mixing from tracer measurements – Part 1: Method. By T. von Clarmann and U. Grabowski in Atmospheric Chemistry and Physics.

The influence of orographic Rossby and gravity waves on rainfall. By N.Y. Cohen and W.R. Boos in the Quarterly Journal of the Royal Meteorological Society.

CFC-11, CFC-12 and HCFC-22 ground-based remote sensing FTIR measurements at Réunion Island and comparisons with MIPAS/ENVISAT data. By M. Zhou et al. in Atmospheric Measurement Techniques.

Discussion papers – open for comment

The radiative role of ozone and water vapour in the temperature annual cycle in the tropical tropopause layer. By A. Ming et al. in Atmospheric Chemistry and Physics Discussions.

Limits on the ability of global Eulerian models to resolve intercontinental transport of chemical plumes. By S.D. Eastham and D.J. Jacob in Atmospheric Chemistry and Physics Discussions.

The SPARC water vapour assessment II: Comparison of annual, semi-annual and quasi-biennial variations in stratospheric and lower mesospheric water vapour observed from satellites. By S. Lossow et al. in Atmospheric Measurement Techniques.