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.

Abstract submission deadline: 11 Jan 2017
Deadline for travel support requests: 1 Dec 2016

The EGU session on Dynamical coupling between the stratosphere and the troposphere (AS1.28) is interested in the dynamical two-way interaction between the stratosphere and the troposphere, the mechanisms for this interaction, and its consequences for explaining both short-term atmospheric weather and longer-term climate variability. This also includes work that investigates alternate diagnostics for the definition of major and minor stratospheric sudden warmings and work that focuses on the role of the stratosphere for the predictability of tropospheric forecast in medium-range to sub-seasonal time scale.

Session conveners: Thomas Reichler, Bo Christiansen and Seok-Woo Son.

Abstract submission is now open and closes on 11 January 2017.
Applications for travel support from early career scientists close on 1 December 2016.

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

Increase in the potential predictability of the Arctic Oscillation via intensified teleconnection with ENSO after the mid-1990s. By D. Kang and M.-I. Lee et al. in Climate Dynamics.

Dry layers in the tropical troposphere observed during CONTRAST and global behavior from GFS analyses. By W.J. Randel et al. in the Journal of Geophysical Research: Atmospheres.

On the role of tropopause folds in summertime tropospheric ozone over the eastern Mediterranean and the Middle East. By D. Akritidis et al. in Atmospheric Chemistry and Physics.

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.

On the discrepancies in tropical belt expansion between reanalyses and climate models and among tropical belt width metrics. By N. Davis and T. Birner in the Journal of Climate.

Early action on HFCs mitigates future atmospheric change. By M.M. Horowitz et al. in Environmental Research Letters.

Comparison of simulated and observed convective gravity waves. By S. Kalisch et al. in the Journal of Geophysical Research: Atmospheres.

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

Impact of global warming on the rise of volcanic plumes and implications for future volcanic aerosol forcing. By T.J. Aubry et al. in the Journal of Geophysical Research: Atmospheres.

Transport of Chemical Tracers from the Boundary Layer to Stratosphere Associated with the Dynamics of the Asian Summer Monsoon. By L.L. Pan et al. in the Journal of Geophysical Research: Atmospheres.

Was breaking the taboo on research on climate engineering via albedo modification a moral hazard, or a moral imperative? By M.G. Lawrence and P.J. Crutzen in Earth’s Future.

Discussion papers – open for comment

Long-lived contrails and convective cirrus above the tropical tropopause. By U. Schumann et al. in Atmospheric Chemistry and Physics Discussions.

Residual Mean Circulation and Temperature Changes during the Evolution of Stratospheric Sudden Warming Revealed in MERRA. By B.-G. Song and H.Y. Chun in Atmospheric Chemistry and Physics Discussions.

Travel support is available for early career scientists that apply before 1 December 2016.

The EGU session on Past and future atmospheric temperature changes and their Drivers (AS1.25/CL4.14) aims to address the current scientific challenges that surround measuring, modelling, and attributing the drivers of atmospheric temperature changes within the troposphere, stratosphere, and mesosphere. Abstracts are welcomed that use observational datasets (e.g. from satellites, aircraft measurements, radiosondes) and numerical models to investigate global and regional atmospheric temperature changes over the past and future.

Session convenors: Amanda Maycock, Andrea Steiner, and Bill Randel.

Abstract submission is now open and closes on 11 January 2017. Applications for travel support from early career scientists close on 1 December 2016.

The VolRes initiative aims to prepare a research plan for the next major volcanic eruption.

The SSiRC activity has started a new initiative called VolRes "Volcano Response Plan after the next major eruption" to prepare a plan for the next major volcanic eruption. This plan aims to highlight the science questions behind the chemical and climate impacts of large volcanic eruptions to define measurement and modelling strategies which will augment our knowledge and can be used to forecast and mitigate their impacts on Earth’s climate. The plan should facilitate the coordination between observational and modelling groups throughout the world. The group have started to gather a diverse group of model and observational scientists who would be interested in participating and in putting together this paper. For further information please contact Jean-Paul Vernier or Claudia Timmreck.