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

A three-dimensional analysis on the role of atmospheric waves in the climatology and interannual variability of stratospheric final warming in the Southern Hemisphere. By S. Harano et al. in the Journal of Geophysical Research: Atmospheres.

Effect of tropical cyclones on the stratosphere-troposphere exchange observed using satellite observations over the north Indian Ocean. By M. Venkat Ratnam et al. in Atmospheric Chemistry and Physics.

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.

Interannual variability of the boreal summer tropical UTLS in observations and CCMVal-2 simulations. By M. Kunze et al. in Atmospheric Chemistry and Physics.

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

Retrieval of Ozone Profiles from Geostationary Infrared Sounder Observations using Principal Component Analysis. By P. Jindal et al. in the Quarterly Journal of the Royal Meteorological Society.

Longitudinal Asymmetric Trends of Tropical Cold-point Tropopause Temperature and Their Link to Strengthened Walker Circulation. By D. Hu et al. in the Journal of Climate.

Influence of tropical Pacific sea surface temperature on the genesis of Gulf Stream cyclones. By S. Schemm et al. in the Journal of the Atmospheric Sciences.

Discussion papers – open for comment

Evidence of horizontal and vertical transport of water in the Southern Hemisphere Tropical Tropopause Layer (TTL) from high-resolution balloon observations. By S.M. Khaykin et al. in Atmospheric Chemistry and Physics Discussions.

Influence of enhanced Asian NO_x emissions on ozone in the Upper Troposphere and Lower Stratosphere (UTLS) in chemistry climate model simulations. By C. Roy et al. in Atmospheric Chemistry and Physics Discussions.

Influence of the spatial distribution of gravity wave activity on the middle atmospheric circulation and transport. By P. Šácha et al. in Atmospheric Chemistry and Physics Discussions.

Tropical temperature variability and Kelvin wave activity in the UTLS from GPS RO measurements. By B. Scherllin-Pirscher et al. in Atmospheric Chemistry and Physics Discussions.

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

Find the July 2016 issue of the SPARC Newsletter at:

http://www.aparc-climate.org/publications/newsletter/

call for nominations – deadline 1 Oct 2016

WCRP and WWRP have established an International Prize for Model Development, awarded annually for an outstanding contribution to weather and climate model development by an early- to mid-career researcher.

More details on eligibility, required nomination material and selection process can be found at www.wcrp-climate.org/wmac-activities/ipmd2016

Nominations of suitable candidates should be forwarded to the WCRP (mrixen (at) wmo.int) and WWRP (pruti (at) wmo.int), and must be received by 1 October 2016.

Call for nominations – deadline 1 Oct 2016

WCRP and GCOS have established an International Data Prize, awarded annually to honour achievements in (climate) data product generation, data management, data preservation, data monitoring, and other data relevant activities by an early- to mid-career researcher.

More details on eligibility, required nomination material and selection process can be found at www.wcrp-climate.org/wdac-activities/idp2016

Nominations of suitable candidates should be forwarded to the WCRP (mrixen (at) wmo.int) and GCOS (gcosjpo (at) wmo.int), and must be received by 1 October 2016.

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

Evidence of global warming impact on the evolution of the Hadley Circulation in ECMWF centennial reanalyses. By R. D’Agostino and P. Lionello in Climate Dynamics.

On the climatological probability of the vertical propagation of stationary planetary waves. By K. Karami et al. in Atmospheric Chemistry and Physics.

Observations of PAN and its confinement in the Asian summer monsoon anticyclone in high spatial resolution. By J. Ungermann et al. in Atmospheric Chemistry and Physics.

Chemical analysis of refractory stratospheric aerosol particles collected within the arctic vortex and inside polar stratospheric clouds. By M. Ebert et al. in Atmospheric Chemistry and Physics.

The Transient Response of the Southern Ocean to Stratospheric Ozone Depletion. By W.J.M. Seviour et al. in the Journal of Climate.

Tropical waves and the quasi-biennial oscillation in a 7-km global climate simulation. By L.A. Holt et al. in the Journal of the Atmospheric Sciences.

Effects of polar stratospheric clouds in the Nimbus 7 LIMS Version 6 data set. By E. Remsberg and V.L. Harvey in Atmospheric Measurement Techniques.

A comparative analysis of UV nadir-backscatter and infrared limb-emission ozone data assimilation. By R. Dragani in Atmospheric Chemistry and Physics.

The Impact of SST Biases on Projections of Anthropogenic Climate Change: A Greater Role for Atmosphere-only Models? By J. He and B.J. Soden in Geophysical Research Letters.

Assessing risks of solar geoengineering starts with accurate aerosol radiative properties. By J.A. Dykema et al. in Geophysical Research Letters.

Discussion papers – open for comment

Observational evidence for aerosols increasing upper tropospheric humidity. By L. Riuttanen et al. in Atmospheric Chemistry and Physics Discussions.

A mid-latitude stratosphere dynamical index for attribution of stratospheric variability and improved ozone and temperature trend analysis. By W.T. Ball et al. in Atmospheric Chemistry and Physics Discussions.

Spectral analysis of atmospheric composition: application to surface ozone model–measurement comparisons. By D.R. Bowdalo et al. in Atmospheric Chemistry and Physics Discussions.

Two mechanisms of stratospheric ozone loss in the Northern hemisphere, studied using data assimilation of Odin/SMR atmospheric observations. By K. Sagi et al. in Atmospheric Chemistry and Physics Discussions.

The Mystery of Carbon Tetrachloride

The seventh SPARC science report on ‘The Mystery of Carbon Tetrachloride’ is now available! Find the full report here: www.sparc-climate.org/publications/sparc-reports/sparc-report-no7

The report helps answer policy-relevant questions related to the global budget of carbon tetrachloride, an important ozone-depleting substance; closing the gap between emissions reported to UNEP’s ozone secretariat and those estimated from atmospheric observations.

Report editors: Qing Liang, Paul A. Newman, and Stefan Reimann.

SPARC leadership is composed of experts from around the world who dedicate their time to SPARC’s international activities. These include the SPARC Scientific Steering Group (SSG), who serve to guide SPARC’s scientific focus. SPARC is now accepting nominations (or self-nominations) for SSG membership to serve from January 2018 – December 2020 (initial three-year term can be extended by two additional years). If you are interested please complete the online form available here. The deadline for nominations is 30 September 2016.

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

Direct injection of water vapor into the stratosphere by volcanic eruptions. By C.E. Sioris et al. in Geophysical Research Letters.

Gravity-wave effects on tracer gases and stratospheric aerosol concentrations during the 2013 ChArMEx campaign. By F. Chane Ming et al. in Atmospheric Chemistry and Physics.

UV and infrared absorption spectra, atmospheric lifetimes, and ozone depletion and global warming potentials for CCl₂FCCl₂F (CFC-112), CCl₃CClF₂ (CFC-112a), CCl₃CF₃ (CFC-113a), and CCl₂FCF₃ (CFC-114a). By M.E. Davis et al. in Atmospheric Chemistry and Physics.

Regional and Seasonal Stratospheric Temperature Trends in the Last Decade (2002-2014) from AMSU observations. By B.M. Funatsu et al. in the Journal of Geophysical Research: Atmospheres.

The STRatospheric Estimation Algorithm from Mainz (STREAM): estimating stratospheric NO2from nadir-viewing satellites by weighted convolution. By S. Beirie et al. in Atmospheric Measurement Techniques.

North Atlantic summer storm tracks over Europe dominated by internal variability over the past millennium. By M.H. Gagen et al. in Nature Geoscience.

The millennium water vapour drop in chemistry–climate model simulations. By S. Brinkop et al. in Atmospheric Chemistry and Physics.

Quantifying Eddy Feedbacks and Forcings in the Tropospheric Response to Stratospheric Sudden Warmings. By P. Hitchcock and I.R. Simpson in the Journal of Atmospheric Sciences.

Impact of Aerosols on Precipitation from Deep Convective Clouds in Eastern China. By M. Jiang et al. in the Journal of Geophysical Research: Atmospheres.

Hybrid ensemble 4DVar assimilation of stratospheric ozone using a global shallow water model. By D.R. Allen et al. in Atmospheric Chemistry and Physics.

Discussion papers – open for comment

Time varying changes in the simulated structure of the Brewer Dobson Circulation. By C.I. Garfinkel et al. in Atmospheric Chemistry and Physics Discussions.

Derivation of Antarctic stratospheric sulfuric acid profiles and nucleation modeling of the polar stratospheric CN layer. By S. Münch and J. Curtius in Atmospheric Chemistry and Physics Discussions.

The role of methane in projections of 21st century stratospheric water vapour. By L. Revell et al. in Atmospheric Chemistry and Physics Discussions.

A workshop on "The Future of Cumulus Parametrisation" will be held from 10-14 July 2017 in Delft, the Netherlands. Please save the date!

Registration will close on 15 May 2017.

Find website.

The Intergovernmental Panel on Climate Change (IPCC) is seeking responses to a questionnaire that will inform a special report on the impacts of a 1.5°C increase in global temperature. The Steering Committee for the Special Report on 1.5ºC has prepared this questionnaire ahead of the Scoping Meeting to be held in August 2016, with the intent to help form the structure and contents of the report.

The questionnaire is available here: https://www.ipcc.ch/report/sr15/pdf/sr15_prescoping_questionnaire.pdf

If you wish to contribute, please return the questionnaire to: tsu@ipcc-wg1.universite-paris-saclay.fr by 15 July 2016.

For further information you can visit the IPCC webpage: https://www.ipcc.ch/report/sr15/ or consult the Future Earth website: http://futureearth.org/news/complete-questionnaire-upcoming-ipcc-report-15degc-climate-target