Due date for nominations: 1 October 2015

At the initiative of the WCRP Modeling Advisory Council, the 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 http://www.wcrp-climate.org/wmac-activities/ipmd2015.

Nominations of suitable candidates should be forwarded to the WCRP () or WWRP () secretariat at WMO and must be received by 1 Oct 2015.

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

Simulation of Polar Ozone Depletion: An Update. By S. Solomon et al. in the Journal of Geophysical Research: Atmospheres.

Characteristics of Tropopause-penetrating Convection determined by TRMM and COSMIC GPS radio occultation measurements. By T. Xian and Y. Fu in the Journal of Geophysical Research: Atmospheres.

Sulfur dioxide (SO₂) from MIPAS in the upper troposphere and lower stratosphere 2002–2012. By M. Höpfner et al. in Atmospheric Chemistry and Physics.

Simulation of the isotopic composition of stratospheric water vapour – Part 2: Investigation of HDO / H₂O variations. By R. Eichinger et al. in Atmospheric Chemistry and Physics.

Identifying Robust Transport Features of the Upper Tropical Troposphere. By J.W. Bergman et al. in the Journal of Geophysical Research: Atmospheres.

Active and widespread halogen chemistry in the tropical and subtropical free troposphere. By S. Wang et al. in Proceedings of the National Academy of Sciences of the United States of America.

The distribution of precipitation and the spread in tropical upper tropospheric temperature trends in CMIP5/AMIP simulations. By S. Flueglistaler et al. in Geophysical Research Letters.

GROMOS-C, a novel ground-based microwave radiometer for ozone measurement campaigns. By S. Fernandez et al. in Atmospheric Measurement Techniques.

Multi-model simulation of CO and HCHO in the Southern Hemisphere: comparison with observations and impact of biogenic emissions. By G. Zeng et al. in Atmospheric Chemistry and Physics.

Discussion papers – open for comment

Effect of retreating sea ice on Arctic cloud cover in simulated recent global warming. By M. Abe et al. in Atmospheric Chemistry and Physics Discussions.

Sensitivity of polar stratospheric cloud formation to changes in water vapour and temperature. By F. Khosrawi et al. in Atmospheric Chemistry and Physics Discussions.

The contribution of oceanic halocarbons to marine and free troposphere air over the tropical West Pacific. By S. Fuhlbrügge et al. in Atmospheric Chemistry and Physics Discussions.

Deadline for abstracts with travel requests: 15 July 2015
Deadline for regular abstracts: 31 July 2015

Dates:
7-9 October 2015

Venue:
ESRIN & CNR – Tor Vergata, Frascati/Rome, Italy

Theme:
Process-oriented evaluation and analysis of CCMI-1 simulations

Highlight:
The first day of the workshop will consist of a joint session with the AeroCom community to focus on the combined CCMI/AeroCom plan for CMIP6 (AerChemMIP).
More information is available on the official workshop website.

Scope:
The CCMI 2015 workshop will focus on process-oriented evaluation and analysis of the CCMI Phase 1 (CCMI-1) troposphere-stratosphere resolving chemistry-climate model simulations using new observations and diagnostics. Parts of the workshop will be devoted to discussing plans for CCMI contributions to TOAR (the Tropospheric Ozone Assessment Report, 2016), the next WMO/UNEP ozone (2018), and CMIP6 (2020). A general description of CCMI can be found at http://www.met.reading.ac.uk/ccmi/.

Workshop Format:
The meeting will include invited and contributed oral presentations, poster sessions, and breakout-groups focusing on relevant workshop topics. Confirmed invited speakers (so far) are: Owen Cooper (USA), Paul Newman (USA), Seok-Woo Son (South Korea), Meiyun Lin (USA), Pieternel Levelt (Netherlands), and Gunnar Myhre (Norway). Information on the joint session with AeroCom is available at http://aerocom.zmaw.de/Welcome.2404.0.html.

Registration and Abstract Submission:
Abstract submission is now available at http://ccmi-workshop.artov.isac.cnr.it/. Please submit an abstract soon, especially if you require a letter of invitation (for which you should contact ). Registration information will be available soon.

Travel support:
We have limited funds for travel support available, primarily for early career and non- OECD scientists. Please provide a CV on the abstract submission page (an abstract must be submitted by July 15).

Venue:
The joint session with AeroCom (7 October) will be held at ESRIN in Frascati, while the following days (8 and 9 October) the workshop continues at CNR Tor Vergata in Rome.

Deadlines:
Abstracts with travel requests: 15 July 2015
Regular abstracts: 31 July 2015
Registration: 1 September 2015 (opens 15 July)

Scientific Organizing Committee:
Michaela Hegglin (U Reading), Jean-François Lamarque (NCAR), Federico Fierli (CNR), Chiara Cagnazzo (CNR), William Collins (U Reading), Michael Schulz (NMI), and the CCMI Scientific Steering Committee.

Local Organizing Committee:
Federico Fierli (CNR), Chiara Cagnazzo (CNR), Francesco Cairo (CNR), Simon Pinnock (ESA), Claus Zehner (ESA)
Questions should be addressed to

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

Contribution of changes in atmospheric circulation patterns to extreme temperature trends. By D.E. Horton et al. in Nature.

Drivers of the recent tropical expansion in the Southern Hemisphere: Changing SSTs or ozone depletion? By D.W. Waugh et al. in the Journal of Climate.

A Chemistry-Climate Model Study of Past Changes in the Brewer-Dobson Circulation. By S. Oberländer-Hayn et al. in the Journal of Geophysical Research: Atmospheres.

Nonlinear response of modelled stratospheric ozone to changes in greenhouse gases and ozone depleting substances in the recent past. By S. Meul et al. in Atmospheric Chemistry and Physics.

The 11-year solar cycle in current reanalyses: a (non)linear attribution study of the middle atmosphere. By A. Kuchar et al. in Atmospheric Chemistry and Physics.

The impact of ozone depleting substances on the circulation, temperature and salinity of the Southern Ocean: An attribution study with CESM1(WACCM). By A. Solomon et al. in Geophysical Research Letters.

Submission deadline: 5 August 2015

Dear Colleagues,

We welcome your submissions to the 2015 AGU Fall Meeting session 8471 entitled "Methodologies and resulting uncertainties in long-term records of ozone and other atmospheric essential climate variables constructed from multiple data sources."

Please note that the submission deadline is Wednesday, August 5.

We look forward to your contribution.

Session URL: https://agu.confex.com/agu/fm15/preliminaryview.cgi/Session8471

Session Description:
We will discuss uncertainties in long-term ozone and climate data records introduced from merging more than one measurement source. Data sources are combined to improve spatial or temporal sampling, or to extend the record in time. Relative offsets and drifts between measurements used in the climate data record introduce uncertainties on top of the measurement error for each individual instrument. Furthermore, individual instrumental records might vary in sensitivity to aerosol interference, sampling regime, spatial resolution, etc. All of these issues can introduce additional errors currently not assessed in analyses of long-term trends from climate data records, thus complicating attempts to confidently quantify long-term changes. This session will discuss prospective approaches for estimating the uncertainties and drifts in atmospheric climate data records constructed from multiple sources.

Primary Convener:
Irina V Petropavlovskikh, Cooperative Institute for Research in Environmental Sciences, Boulder, CO, United States

Conveners:
Thierry Leblanc, California Institute of Technology, Pasadena, CA, United States, Karen Hepler Rosenlof, NOAA ESRL CSD, Boulder, CO, United States and Dale F Hurst, Cooperative Institute for Research in Environmental Sciences, Boulder, CO, United States

Sincerely,
Irina, Thierry, Karen and Dale

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

Unusual stratospheric ozone anomalies observed in 22 years of measurements from Lauder, New Zealand. By G. E. Nedoluha et al. in Atmospheric Chemistry and Physics.

Evaluating the advective Brewer-Dobson circulation in three reanalyses for the period 1979–2012. By M. Abalos et al. in the Journal of Geophysical Research: Atmospheres.

The role of convective overshooting clouds in tropical stratosphere–troposphere dynamical coupling. By K. Kodera et al. in Atmospheric Chemistry and Physics.

Lagrangian analysis of microphysical and chemical processes in the Antarctic stratosphere: a case study. By L. Di Liberto et al. in Atmospheric Chemistry and Physics.

Momentum forcing of the quasi-biennial oscillation by equatorial waves in recent reanalyses. By Y.-H. Kim and H.-Y. Chun in Atmospheric Chemistry and Physics.

Discussion papers – open for comment

Ozonesonde profiles from the West Pacific Warm Pool. By R. Newton et al. in Atmospheric Chemistry and Physics Discussions.

Trend analysis of the 20 years time series of stratospheric ozone profiles observed by the GROMOS microwave radiometer at Bern. By L. Moreira 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).

The impact of overshooting deep convection on local transport and mixing in the tropical upper troposphere/lower stratosphere (UTLS). By W. Frey et al. in Atmospheric Chemistry and Physics.

An evaluation of ozone dry deposition in global scale chemistry climate models. By C. Hardacre et al. in Atmospheric Chemistry and Physics.

Processes controlling tropical tropopause temperature and stratospheric water vapor in climate models. By S.C. Hardiman et al. in the Journal of Climate.

Impacts of 20^th century aerosol emissions on the South Asian monsoon in the CMIP5 models. By L. Guo et al. in Atmospheric Chemistry and Physics.

Subtropical and mid-latitude ozone trends in the stratosphere: implications for recovery. By P.J. Nair et al. in the Journal of Geophysical Research: Atmospheres.

Find instructions of how to obtain access to the data on the CCMI website.

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

Tug of war on summertime circulation between radiative forcing and sea surface warming. By T.A. Shaw and A. Voigt in Nature Geoscience.

Climate Symposium 2014 – Findings and Recommendations. By G. Asrar et al. in the Bulletin of the American Meteorological Society.

Evaluation of updated nitric acid chemistry on ozone precursors and radiative effects. By K.M. Seltzer et al. in Atmospheric Chemistry and Physics.

Interannual variability of the Madden-Julian Oscillation and its impact on the North Atlantic Oscillation in the boreal winter. By H. Lin et al. in Geophysical Research Letters.

Black Carbon Aerosols Induced Northern Hemisphere Tropical Expansion. By M. Kovilakam and S. Mahajan in Geophysical Research Letters.

The role of blocking in the summer 2014 collapse of Etesians over the eastern Mediterranean. By E. Tyrlis et al. in the Journal of Geophysical Research: Atmospheres.

Gravity wave propagation through a vertically and horizontally inhomogeneous background wind. By C.J. Heale and J.B. Snively in the Journal of Geophysical Research: Atmospheres.

The effect of ozone depletion on the Southern Annular Mode and stratosphere-troposphere coupling. By F. Dennison et al. in the Journal of Geophysical Research: Atmospheres.

Stratospheric sulfate aerosol injections cannot preserve the West Antarctic Ice Sheet. By K.E. McCusker et al. in Geophysical Research Letters.

Discussion Papers – Open for comment

Transport pathways of peroxyacetyl nitrate in the upper troposphere and lower stratosphere from different monsoon systems during the summer monsoon season. By S. Fadnavis 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).

Quantifying the role of internal climate variability in future climate trends. By D.W.J Thompson et al. in the Journal of Climate.

Quantifying contributions to the recent temperature variability in the tropical tropopause layer. By W. Wang et al. in Atmospheric Chemistry and Physics.

Wind extraction potential from ensemble Kalman filter assimilation of stratospheric ozone using a global shallow water model. By D.R. Allen et al. in Atmospheric Chemistry and Physics.

Polar-lower latitude linkages and their role in weather and climate prediction. By T. Jung et al. in the Bulletin of the American Meteorological Society.

Drivers of the tropospheric ozone budget throughout the 21st century under the medium-high climate scenario RCP 6.0. By L.E. Revell et al. in Atmospheric Chemistry and Physics.

Discussion Papers – Open for comment

Oceanic bromine emissions weighted by their ozone depletion potential. By S. Tegtmeier et al. in Atmospheric Chemistry and Physics Discussions.

Reassessment of MIPAS age of air trends and variability. By F.J. Haenel et al. in Atmospheric Chemistry and Physics Discussions.

Global HCFC-22 measurements with MIPAS: retrieval, validation, climatologies and trends. By M. Chirkov et al. in Atmospheric Chemistry and Physics Discussions