The Arosa site is well known in the ozone community for its continuous total ozone column observations recorded since 1926. Originally based on Dobson sun spectrophotometers, the site has been gradually complemented by three automatic Brewer instruments, in operation since 1998. To secure the long term ozone monitoring in this Alpine region and to benefit from synergies with the World Radiation Center, the feasibility of moving this activity to the nearby site at Davos (aerial distance of 13 km) has been explored. Join the discussion on the paper by Stuebi et al. published in Atmospheric Measurement Techniques.

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

A Case Study of Convectively Sourced Water Vapor Observed in the Overworld Stratosphere over the United States. By J.B. Smith et al. in the Journal of Geophysical Research: Atmospheres.

On the spatio-temporal representativeness of observations. By N. Schutgens et al. in Atmospheric Chemistry and Physics.

Modeling the inorganic bromine partitioning in the tropical tropopause layer over the eastern and western Pacific Ocean. By M.A. Navarro et al. in Atmospheric Chemistry and Physics.

Sensitivity of the tropical stratospheric ozone response to the solar rotational cycle in observations and chemistry–climate model simulations. By R. Thiéblemont et al. in Atmospheric Chemistry and Physics.

Processes maintaining tropopause sharpness in numerical models. By L. Saffin et al. in the Journal of Geophysical Research: Atmospheres.

Downward Influence of QBO-like Oscillation on Moist Convection in a Two-Dimensional Minimal Model Framework. By H.H. Bui et al. in the Journal of the Atmospheric Sciences.

Discussion papers – open for comment

Multi-model comparison of the volcanic sulfate deposition from the 1815 eruption of Mt. Tambora. By L. Marshall et al. in Atmospheric Chemistry and Physics Discussions.

On the distortions in calculated GW parameters during slanted atmospheric soundings. By A. de la Torre et al. in Atmospheric Measurement Techniques Discussions.

Retrieval of ozone profiles from OMPS limb scattering observations. By C. Arosio et al. in Atmospheric Measurement Techniques Discussions.

Chemical and climatic drivers of radiative forcing due to changes in stratospheric and tropospheric ozone over the 21st century. By A. Banerjee et al. in Atmospheric Chemistry and Physics Discussions.

The SPARC Office is in the transition of moving from ETH Zurich to the German Aerospace Center (DLR) in Oberpfaffenhofen. Apply for the position of Project Scientist in the new SPARC Office before 15 September.

Find vacancy.

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

Impact of Volcanic Aerosols on Stratospheric Ozone Recovery. By V. Naik et al. in the Journal of Geophysical Research: Atmospheres.

The characteristics of the lower stratospheric gravity wave field above Halley (75°S, 26°W), Antarctica, from radiosonde observations. By T. Moffat-Griffin and S.-R. Colwell in the Journal of Geophysical Research: Atmospheres.

Mirrored Changes in Antarctic Ozone and Stratospheric Temperature in the late 20th versus early 21st Centuries. By S. Solomon et al. in the Journal of Geophysical Research: Atmospheres.

Gravity Wave Spectra in the Lower Stratosphere Diagnosed from Project Loon Balloon Trajectories. By M.R. Schoeberl et al. in the Journal of Geophysical Research: Atmospheres.

Dynamical Heating of the Arctic Atmosphere during the Springtime Transition. By X. Long and W.A. Robinson in the Journal of Climate.

Contributions of climate feedbacks to changes in atmospheric circulation. By P. Ceppi and T.G. Shepherd in the Journal of Climate.

Connecting Tropical Climate Change with Southern Ocean Heat Uptake. By Y.-T- Hwang et al. in Geophysical Research Letters.

The relationship between northern hemisphere winter blocking and tropical modes of variability. By G. Gollan and R.J. Greatbatch in the Journal of Climate.

Discussion papers – open for comment

The Network for the Detection of Atmospheric Composition Change (NDACC): History, status and perspectives. By M. de Mazière et al. in Atmospheric Chemistry and Physics Discussions.

VESPA-22: a ground-based microwave spectrometer for long-term measurements of Polar stratospheric water vapor. By G. Mevi et al. in Atmospheric Measurement Techniques Discussions.

Drift corrected Odin-OSIRIS ozone product: algorithm and updated stratospheric ozone trends. By A.E. Bourassa et al. in Atmospheric Measurement Techniques Discussions.

WCRP and the World Weather Research Programme are seeking nominations for the International Prize for Model Development, awarded annually for an outstanding contribution to weather and climate model development by an early- to mid-career researcher. Find information on IPMD 2017.

In addition, WCRP together with the Global Climate Observing System (GCOS) are seeking nominations for the International Data Prize 2017. The prize is awarded annually to an early- to mid-career researcher for his or her outstanding contribution to the Earth system science community. Find information on IDP 2017.

Nominations for both prizes close on 1 October 2017.

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

Observational evidence of the downstream impact on tropical rainfall from stratospheric Kelvin waves. By L. Zhang et al. in Climate Dynamics.

Assessment of NOAA NUCAPS Upper Air Temperature Profiles Using COSMIC GPS Radio Occultation and ARM Radiosondes. By M.L. Feltz et al. in the Journal of Geophysical Research: Atmospheres.

Assessment of COSMIC radio occultation and AIRS hyperspectral IR sounder temperature products in the stratosphere using observed radiances. By M.L. Feltz et al. in the Journal of Geophysical Research: Atmospheres.

Dynamics and Predictability of Downward Propagating Stratospheric Planetary Waves Observed in March 2007. By H. Mukougawa et al. in the Journal of the Atmospheric Sciences.

Discussion papers – open for comment

Sensitivity of the radiative forcing by stratospheric sulfur geoengineering to the amount and strategy of the SO₂ injection studied with the LMDZ-S3A model. By C. Kleinschmitt et al. in Atmospheric Chemistry and Physics Discussions.

Accuracy and precision of lower stratospheric polar reanalysis temperatures evaluated from A-train CALIOP and MLS, COSMIC GPS RO, and the equilibrium thermodynamics of supercooled ternary solutions and ice clouds. By A. Lambert and M.L. Santee in Atmospheric Chemistry and Physics Discussions.

Intercomparison of AIRS and HIRDLS stratospheric gravity wave observations. By C.I. Meyer et al. in Atmospheric Measurement Techniques Discussions.

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

Early prediction of extreme stratospheric polar vortex states based on causal precursors. By M. Kretschmer et al. in Geophysical Research Letters.

The Response of the Southern Hemisphere Middle Atmosphere to the Madden-Julian oscillation during Austral Winter Using the Specified-Dynamics Whole Atmosphere Community Climate Model. By C. Yang et al. in the Journal of Climate.

MIPAS IMK/IAA carbon tetrachloride (CCl₄) retrieval and first comparison with other instruments. By E. Eckert et al. in Atmospheric Measurement Techniques.

More frequent Sudden Stratospheric Warming events due to enhanced MJO forcing expected in a warmer climate. By W. Kang and E. Tziperman in the Journal of Climate.

The Large Scale Dynamical Response of Clouds to Aerosol Forcing. By B. Soden and E.-S. Chung in the Journal of Climate.

Using the artificial tracer e90 to examine present and future UTLS tracer transport in WACCM. By M. Abalos et al. in the Journal of the Atmospheric Sciences.

An assessment of ozone mini-hole representation in reanalyses over the Northern Hemisphere. By L.F. Millan and G.L. Manney in Atmospheric Chemistry and Physics.

Discussion papers – open for comment

The Impact of Non-uniform Sampling on Stratospheric Ozone Trends Derived from Occultation Instruments. By R.P. Damadeo et al. in Atmospheric Chemistry and Physics Discussions.

Deadline 14 August 2017

Future Earth is inviting contributions to defining its research priorities for "Health, Climate, and Environment". Review the document put together by the Future Earth Knowledge Action Network on Health and provide feedback through an online survey. Find more information at: http://futureearth.org/news/open-consultation-research-priorities-health-climate-and-environment

Each year since 1962, the American Geophysical Union (AGU) has elected as Fellows members whose visionary leadership and scientific excellence have fundamentally advanced research in their respective fields. This year, 61 members will join the 2017 class of Fellows. Joan Alexander, a previous SPARC Co-chair, has been recognised for her contributions by this prestigious award. Find more details and the full list of fellows at: https://eos.org/agu-news/2017-class-of-agu-fellows-announced

Deadline 30 September 2017

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 2019 – December 2021 (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 2017.