Category Archives: News

SPARC Science update: 13 April – 19 April

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

Validation of wind measurements of two mesosphere–stratosphere–troposphere radars in northern Sweden and in Antarctica. By E. Belova et al. in Atmospheric Measurement Techniques.

Space‐borne estimation of volcanic sulfate aerosol lifetime. By C. Li and R.C. Cohen in the Journal of Geophysical Research: Atmospheres.

The 2000‐2012 global warming hiatus more likely with a low climate sensitivity. By A. Modak and T. Mauritsen in the Geophysical Research Letters.

The Strong Stratospheric Polar Vortex in March 2020 in S2S Models: Implications for Empirical Prediction of the Low Arctic Total Ozone Extreme. By J. Rao and C.I. Garfinkel in the Journal of Geophysical Research: Atmospheres.

New: improved Fortran and Python decoding programs for high vertical-resolution radiosonde data

In SPARC Newsletter number 56, Geller et al. (2021) described increased high vertical-resolution radiosonde data that is now available to the global research community, and in that article they described how to access those data. Mr. Bruce Ingleby has now developed improved Fortran and Python decoding programs for those data. They can be accessed from ‘. Future developments will be described as they become available.

SPARC Science update: 06 April – 12 April

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

Indicators of Antarctic ozone depletion: 1979 to 2019. By G.E. Bodeker and S. Kremser in Atmospheric Chemistry and Physics.

Stratospheric impacts of continuing CFC‐11 emissions simulated in a chemistry‐climate model. By E.L. Fleming et al. in the Journal of Geophysical Research: Atmospheres.

Gravity Wave Weakening During the 2019 Antarctic Stratospheric Sudden Warming. By M. Kogure, J. Yue, and H. Liu in the Geophysical Research Letters.

Discussion papers – open for comment:

Using Vertical Phase Differences to Better Resolve 3D Gravity Wave Structure. By C.J. Wright et al. in Atmospheric Measurement Techniques.

Announcement: WCRP Open Science Conference: early 2023

Dear colleagues,  
We are delighted to share with you the First Circular of the WCRP Open Science Conference, to take place in early 2023 (download flyer). This conference will showcase the work that all of you are doing, right across WCRP and with partners. In particular, it will highlight the importance of climate science for decision-making and responding to a changing climate. This Conference will, of course, celebrate the work of the WCRP Grand Challenges, which will sunset at the end of 2022. At the same time, it will roll out the new WCRP and will be dedicated to the next generation of climate scientists. It will also include events that cater to the general public.   
In the next weeks and months we will continue with the planning of the conference, including identifying a host for the in-person part of the meeting and the establishment of a science planning committee. Conference planning will be supported by dedicated staff who will be hired specifically for this purpose using external funds.  
Kind regards  
Detlef Stammer and Helen Cleugh  
Download First Circular
WCRP OSC 2023:  
Contact email: gro.e1621044015tamil1621044015c-prc1621044015w@32C1621044015SO-PR1621044015CW1621044015  

Announcement: PACES Open Science Meeting 26-28 May 2021

The 4th PACES Open Science meeting will be held 26-28 May 2021 in an online format. We are planning for a more limited meeting than in past years, to account for the wide range of time zones that may wish to participate. However we still expect a full programme of science presentations across the full range of PACES science topics, and we will also make some time for virtual posters and discussion. We would also like to review progress across the PACES working groups, and provide opportunity for engagement in these activities. 

The meeting sessions will take place as follows:

26 May: 11:00-14:00 UTC
27 May: 12:00-15:00 UTC
28 May: 13:00-16:00 UTC

The programme will cover:  Arctic climate impacts of air pollution, Arctic-mid latitude linkages, long-range pollution transport to the Arctic, aerosol-cloud interactions in the Arctic, Improving observational capacity, Local Arctic air pollution sources and processing (including the forthcoming ALPACA project), Arctic urbanisation and air pollution.

As in previous meetings, the emphasis will be on getting together as a research community and sharing new analyses and progress on these different topics. 

Registration will open in mid-April, so please look out for a further announcement, which will also include a draft scientific programme and information on keynote speakers.  

Please save the date(s)! 

Best wishes,
Steve and Kathy, PACES co-chairs.

(on behalf of the PACES Steering Committee)

PACES is an IGAC and IASC co-sponsored initiative, which aims to review existing knowledge and foster new research on the sources and fate of Arctic air pollution, its impacts on climate, health, and ecosystems, on the feedbacks between pollution and natural sources, on climate responses, and on societal perspectives. 

SPARC Science update: 30 March – 05 April

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

Evaluating stratospheric ozone and water vapour changes in CMIP6 models from 1850 to 2100. By J. Keeble et al. in Atmospheric Chemistry and Physics.

A Global Monitoring System Could Change the Future of Climatology. By S. Sidik in EOS.

Polar Stratospheric Clouds Satellite Observations, Processes, and Role in Ozone Depletion. By I. Tritscher et al. in the Reviews of Geophysics.

The impact of split and displacement sudden stratospheric warmings on the troposphere. By I.P. White et al. in the Journal of Geophysical Research: Atmospheres.

Persistent Stratospheric Warming due to 2019‐20 Australian Wildfire Smoke. By P. Yu et al. in the Geophysical Research Letters.

Discussion papers – open for comment:

The Brewer-Dobson circulation in CMIP6. By M. Abalos et al. in Atmospheric Chemistry and Physics.

Abstract submission open: ESA Water Vapour Climate Change Initiative (WV_cci)

User workshop; 14 – 18 June 2021 – online

Topic: Challenges around atmospheric water vapour

Abstract submission & registration now open at


The Water Vapour Climate Change Initiative (WV_cci) is a project of the European Space Agency (ESA) with the overall goal to generate climate data records (CDRs) of atmospheric water vapour for use in climate applications. The project develops, validates, and releases quality-controlled, long-term CDRs of total column water vapour (TCWV) and water vapour profiles in the stratosphere (2D), as well as a five-year data record of water vapour profiles in the troposphere and lower stratosphere (3D).


The aim of the workshop is to bring together the broader water vapour community, including those interested in the generation of water vapour CDRs and data users (such as climate modellers and NWP researchers) in order to discuss the most recent scientific applications and challenges in processing and using water vapour CDRs. Topics of the workshop include:
• Discuss challenges related to the generation of water vapour CDRs.
• Show-case climate user applications of water vapour CDRs (with focus on WV_cci CDRs).
• Collect and update user requirements for atmospheric water vapour.
• Present and discuss results from climate analysis, climate applications, and process studies using water vapour CDRs.


The workshop will be carried out online and will consist of a series of presentations and discussion blocks. It is foreseen to have the workshop in the week 14–18 June 2021, at 14– 18 CEST. The exact number of days will depend on the number of submitted abstracts.

Important dates:

Abstract submission deadline:05 May 2021
Registration:31 May 2021

16th IGAC Scientific Conference: Atmospheric Chemistry from a Distance: Real Progress through Virtual Interaction

Held Virtually Globally, week of 12 September 2021

For the 2021 virtual conference, IGAC’s scientific program will center its scientific program around its current working groups and activities.  This will highlight the exciting work being done as part of IGAC, grow the networks of these working groups and activities, and expose new scientists to the year-round work IGAC does. IGAC will also have an open science session for atmospheric chemistry research that does not fit into any current working groups or activities. We hope this will expose any gaps in IGAC’s current activities and serve as a poll for the atmospheric community on the next big questions in atmospheric chemistry. 

Abstracts are open for submission here and are due May 1st, 2021. You may modify abstracts submitted for the delayed Manchester 2020 IGAC conference or delete and submit a new abstract. 

The conference will take place the week of September 12, 2021. An Early Career Research Programme will take place the week before the main conference. A link to register your interest in this program is at the bottom of the abstract submission link. 

To register for the conference without submitting an abstract, click here. 

Announcement: WCRP-WWRP Symposium on Data Assimilation & Reanalysis: 13 – 18 Sep. 2021

The WCRP-WWRP Symposium on Data Assimilation and Reanalysis will be held in Bonn (Germany), 13-18 September 2021 alongside the 2021 ECMWF Annual Seminar on Observations. The event is kindly organized by Deutscher Wetterdienst (DWD) at ECMWF’s new location in Bonn.

Abstract submission and financial support applications are now open, with a deadline of 30 April 2021.

Find more information on the meeting objectives and program at