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

Future Directions for the World Climate Research Programme. By G. Brasseur and D. Carlson in EOS.

On the accuracy of stratospheric aerosol extinction derived from in situ size distribution measurements and surface area density derived from remote SAGE II and HALOE extinction measurements. By M. Kovilakam and T. Deshler in the Journal of Geophysical Research: Atmospheres.

Decadal hindcasts initialised using observed surface wind stress: Evaluation and Prediction out to 2024. By M. Thoma et al. in Geophysical Research Letters.

Temporal variations of flux and altitude of sulfur dioxide emissions during volcanic eruptions: implications for long-range dispersal of volcanic clouds. By M. Boichu et al. in Atmospheric Chemistry and Physics.

A tropospheric chemistry reanalysis for the years 2005–2012 based on an assimilation of OMI, MLS, TES, and MOPITT satellite data. By K. Miyazaki et al. in Atmospheric Chemistry and Physics.

Stratospheric response to intraseasonal changes in incoming solar radiation. By C.I. Garfinkel et al. in the Journal of Geophysical Research: Atmospheres.

Self Acceleration and Instability of Gravity Wave Packets: 1. Effects of Temporal Localization. By D.C. Fritts et al. in the Journal of Geophysical Research: Atmospheres.

Two decades of water vapor measurements with the FISH fluorescence hygrometer: a review. By J. Meyer et al. in Atmospheric Chemistry and Physics.

Extended and refined multi sensor reanalysis of total ozone for the period 1970–2012. By R.J. van der A et al. in Atmospheric Measurement Techniques.

Global distributions of overlapping gravity waves in HIRDLS data. By C.J. Wright et al. in Atmospheric Chemistry and Physics.

Discussion papers – open for comment

The imprint of stratospheric transport on column-averaged methane. By A. Ostler et al. in Atmospheric Chemistry and Physics Discussions.

Implications of model bias in carbon monoxide for methane lifetime. By S.A. Strode et al. in Atmospheric Chemistry and Physics Discussions.

Registration is open for the workshop held on 20-22 September 2016 in Richland WA, USA

Find more information.

Subscribe to the mailing list.

Call for Nominations – due date for nominations is 1 October 2015

Find more information.

Abstract submission deadline: 31 July 2015, Registration deadline: 24 Aug 2015

Description:

Carbon tetrachloride (CCl4 or CTC) is a major ozone-depleting substance and greenhouse gas. However, estimated CTC sources and sinks are inconsistent with abundance observations. Recent work suggests that there is a large unknown CTC source of about
39 Gg yr-1 and a 35-year lifetime. This workshop’s purpose is to bring together science, industry, and technology experts to exchange information and to coordinate research activities across disciplines for fully closing the CTC budget. This workshop will involve solicited and submitted presentations related to all aspects of the CTC problem.

Topics:

1. Emissions or Sources:

• CTC consumption and production for both historic and current usage
• CTC feedstock usage, and potential fugitive emissions
• Legacy emissions from brown-field sites
• Top-down global and regional emissions estimate for CTC

2. Loss Processes: Photochemical, ocean, and soil losses of CTC

3. Observations: CTC measurements from ground stations, aircraft, balloon, satellite,
and ships to constrain the CTC budget

4. Modeling: Reconciling the emission and loss processes of CTC with observations in a global modeling perspective

Invited Keynote Speakers:

David Sherry (Nolan Sherry & Associates Ltd., UK): Industrial usage of CTC
Lambert Kujipers (TEAP/UNEP, NL): Production and emissions
Matt Rigby (University of Bristol, UK): Top-down emissions estimate for CTC
Jim Butler (NOAA, USA): Ocean losses of CTC
Steve Montzka (NOAA, USA): Overview of CTC observations
Qing Liang (NASA/USRA, USA): Global modeling of CTC

The outcome of the workshop will be summarized in the SPARC newsletter. We will strongly encourage all participants to reformulate their presentations into written papers. From these presentation and papers, we plan to organize a peer-reviewed special issue on all aspects of the CTC problem.

Timeline:

31 July 2015: Abstract Deadline.

24 August 2015: Registration Deadline.

5-6 October 2015: Workshop

Meeting venue and logistics:

The workshop will be held at Empa and hotel room blocks are reserved at a nearby hotel (Hotel Sonnental).

Meeting fee: 250 CHF (will be collected in cash at the meeting).

Hotel Sonnental
Zürichstrasse 94 / 96
8600 Dübendorf
T +41 44 802 12 82
F +41 44 821 41 91

Organizing Committee:

Stefan Reimann (Empa, Switzerland), Paul Newman (NASA, USA),
Qing Liang (USRA/NASA, USA)

For more information on this SPARC activity, please visit the following link at: http://www.aparc-climate.org/activities/emerging-activities/

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

What controls stratospheric water vapor in the NH summer monsoon regions? By W.J. Randel et al. in the Journal of Geophysical Research: Atmospheres.

Importance of latent heat release in ascending air streams for atmospheric blocking. By S. Pfahl et al. in Nature Geoscience.

Injection of iodine to the stratosphere. By A. Saiz-Lopez et al. in Geophysical Research Letters.

Sources of Seasonal Variability in Tropical UTLS Water Vapor and Ozone: Inferences from the Ticosonde Dataset at Costa Rica. By M.R. Schoeberl et al. in the Journal of Geophysical Research: Atmospheres.

The Interaction between the Tropopause Inversion Layer and the Inertial Gravity Wave activities revealed by radiosonde observations at a midlatitude station. By Y. Zhang et al. in the Journal of Geophysical Research: Atmospheres.

Modeling and mechanisms of polar winter upper stratosphere lower mesosphere disturbances in WACCM. By K. Greer et al. in the Journal of Geophysical Research: Atmospheres.

Tropospheric ozone variability in the tropics from ENSO to MJO and shorter timescales. By J.R. Ziemke et al. in Atmospheric Chemistry and Physics.

Comparison of co-located independent ground-based middle-atmospheric wind and temperature measurements with Numerical Weather Prediction models. By A. Le Pichon et al. in the Journal of Geophysical Research: Atmospheres.

Discussion papers – open for comment

Updated ozone absorption cross section will reduce air quality compliance. By E.D. Sofen et al. in Atmospheric Chemistry and Physics Discussions.

Abstract deadline for oral presentations: 20 July 2015 (extended until 3 August.

IGAC is pleased to endorse the upcoming Chemistry in the Urban Atmosphere Faraday Discussion in order to help foster atmospheric chemistry research on urban air quality and health.

Please note that the abstract deadline of 20 July 2015 for oral presentation has been extended until 3 August.

For more information visit:
http://www.rsc.org/conferencesandevents/rscconferences/fd/atmosphere-fd2016/index.asp

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

The Deep Propagating Gravity Wave Experiment (DEEPWAVE): An Airborne and Ground-Based Exploration of Gravity Wave Propagation and Effects from their Sources throughout the Lower and Middle Atmosphere. By D. C. Fritts et al. in the Bulletin of the American Meteorological Society.

Comparing Sudden Stratospheric Warming Definitions in Reanalysis Data. By F.M. Palmeiro et al. in the Journal of Climate.

Impacts of Stratospheric Ozone Depletion and Recovery on Wave Propagation in the Boreal Winter Stratosphere. By D. Hu et al. in the Journal of Geophysical Research: Atmospheres.

Effects of volcanism on tropical variability. By N. Maher et al. in Geophysical Research Letters.

A coupled data assimilation system for climate reanalysis. By P. Laloyaux et al. in the Quarterly Journal of the Royal Meteorological Society.

Aircraft measurements of gravity waves in the upper troposphere and lower stratosphere during the START08 field experiment. By F. Zhang et al. in Atmospheric Chemistry and Physics.

An objective determination of optimal site locations for detecting expected trends in upper-air temperature and total column ozone. By K. Kreher et al. in Atmospheric Chemistry and Physics.

The southern stratospheric gravity wave hot spot: individual waves and their momentum fluxes measured by COSMIC GPS-RO. By N.P. Hindley et al. in Atmospheric Chemistry and Physics.

Onset of circulation anomalies during stratospheric vortex weakening events: the role of planetary-scale waves. By P. Martineau and S.-W. Son in the Journal of Climate.

Discussion papers – open for comment

Evaluation of the Australian Community Climate and Earth-System Simulator Chemistry-Climate Model. By K.A. Stone et al. in Atmospheric Chemistry and Physics Discussions.

The print version of SPARC Newsletter 45, July 2015, will soon be sent to subscribers in hardcopy. View and download the digital version already today.

Find SPARC newsletter.

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

Stratospheric intrusions, the Santa Ana winds, and wildland fires in southern California. By A.O. Langford et al. in Geophysical Research Letters.

HCFC-133a (CF₃CH₂Cl): OH Rate Coefficient, UV and Infrared Absorption Spectra, and Atmospheric Implications. By M.R. McGillen et al. in Geophysical Research Letters.

Numerical simulations of extratropical tropopause-penetrating convection: Sensitivities to grid resolution. By C.R. Homeyer in the Journal of Geophysical Research: Atmospheres.

The Response of the South Asian Summer Monsoon to Temporal and Spatial Variations in Absorbing Aerosol Radiative Forcing. By S.-Y. Lee and C. Wang in the Journal of Climate.

Maximum likelihood representation of MIPAS profiles. By T. von Clarmann et al. in Atmospheric Measurement Techniques.

Sensitivities of Lagrangian modelling of mid-latitude cirrus clouds to trajectory data quality. By E. Kienast-Sjögren et al. in Atmospheric Chemistry and Physics.

Characterisation of J(O¹D) at Cape Grim 2000–2005. By S.R. Wilson in Atmospheric Chemistry and Physics.

Discussion papers – open for comment

Enhanced internal gravity wave activity and breaking over the Northeastern Pacific/Eastern Asian region. By P. Sacha et al. in Atmospheric Chemistry and Physics Discussions.

Second Call for Applications – deadline: 20 July 2015

If you would like to apply for a place on the school, but did not fill out the Expression of Interest (EOI) after the 1st call in May, then please do so. Candidates for a full application will be selected from these EOI’s. We are asking for people wishing to apply to this school to fill out the Expression of Interest form by 20th July. You can find the form here: www.climate-cryosphere.org/wcrp/pcpi/meetings/abisko-pp-2016/expression-of-interest

Limited travel support may be available, particularly for participants from developing countries.

For more information on the school, visit http://www.climate-cryosphere.org/wcrp/pcpi/meetings/abisko-pp-2016.

For any questions, contact Jonny Day <>.