All posts by Mareike@WCRP/SPARC

SPARC Science update: 19 January – 25 January

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

Record low ozone values over the Arctic in boreal spring 2020. By M. Dameris et al. in Atmospheric Chemistry and Physics.

A methodology for attributing the role of climate change in extreme events: a global spectrally nudged storyline. By L. van Garderen, F. Feser and T.G. Shepherd in Natural Hazards and Earth System Sciences.

Stratospheric ozone and quasi-biennial oscillation (QBO) interaction with the tropical troposphere on intraseasonal and interannual timescales: a normal-mode perspective. By B. Raphaldini et al. in Earth System Dynamics.

Improving ECC Ozonesonde Data Quality: Assessment of Current Methods and Outstanding Issues. By D.W. Tarasick et al. in Earth and Space Science.

Global temperatures in 2020 tied record highs. By P. Voosen in Science.

Discussion papers – open for comment

Orographically-Induced Spontaneous Imbalance within the Jet Causing a Large Scale Gravity Wave Event. By M. Geldenhuys et al. in Atmospheric Chemistry and Physics.

A stratospheric prognostic ozone for seamless Earth System Models: performance, impacts and future. By B.M. Monge-Sanz et al. in Atmospheric Chemistry and Physics.

Announcement: Ozone_cci User Workshop 16-17 March 2021

16-17 March 2021, online : 2 half-day virtual sessions via Webex (in the late afternoon, to facilitate participation of Canadian and US colleagues).

The workshop will provide overviews of the different ozone data products generated in Ozone_cci in recent years and of their quality. We will further discuss applications of the ozone data products by international initiatives, for instance for trend assessments, for re-analysis, and for the evaluation of atmospheric models. In addition, we have planned selected talks on key science highlights in recent years.

The European Space Agency Climate Change Initiative aims to realise the full potential of the longterm global Earth Observation archives that ESA, together with its member states, has established over the past 30 years. This workshop focuses on the generation and exploitation of CCI’s multidecadal time series of harmonised and consistent ozone data suitable to assess long-term changes in total ozone, as well as its vertical distribution.

Day 1: Ozone_cci Climate Data Records and Quality Assessment

Presentation by the CCI team of the ozone data records in the CCI portfolio. We discuss their characteristics and illustrate how to obtain and work with these data records. We also provide our assessment of their quality

Day 2: Scientific use of Ozone_cci data

Presentation by researchers outside the CCI team of selected scientific topics and international initiatives, where Ozone_cci data records (can) make an important contribution.

Find more information on the program, and the registration form on the meeting webpage.

SPARC Science update: 12 January – 18 January

Reflections on weather and climate research. By W. Cai et al. in nature reviews: earth & environment.

Future changes in Northern Hemisphere summer weather persistence linked to projected Arctic warming. By K. Kornhuber and T. Tamarin-Brodsky in the Geophysical Research Letters.

Does Lower‐Stratospheric Shear Influence the Mesoscale Organization of Convection? By T.P. Lane in the Geophysical Research Letters.

Contrast relationships between Arctic Oscillation and ozone in the stratosphere over the Arctic in early and mid‐to‐late winter. By M. Liu and D. Hu in the Journal of Geophysical Research: Atmospheres.

On the best locations for ground-based polar stratospheric cloud (PSC) observations. By M. Tesche, P. Achtert, and M.C. Pitts in Atmospheric Chemistry and Physics.

Discussion papers – open for comment:

Consistency of total column ozone measurements between the Brewer and Dobson spectroradiometers of the LKO Arosa and PMOD/WRC Davos. By J. Gröbner et al. in Atmospheric Measurement Techniques.

Intercomparisons, Error Assessments, and Technical Information on Historical Upper-Air Measurements. By N. Imfeld et al. in Earth System Science Data.

The stratospheric Brewer–Dobson circulation inferred from age of air in the ERA5 reanalysis. By F. Ploeger et al. in Atmospheric Chemistry and Physics.

Upcoming deadline: abstract submission to EGU General Assembly 2021

The deadline for abstract submission to the EGU General Assembly 2021 was extended until Wednesday 20 January at 13:00 CET.

The following is a non-exhaustive list or sessions with relevance to SPARC:

AS1.4 Subseasonal-to-Seasonal Prediction: Processes and Impacts
Convener: Daniela Domeisen | Co-conveners: Francesca Di Giuseppe, A.G. Muñoz, Frederic Vitart, Christopher White
>> Abstract submission

CL4.19 Dynamics of the atmospheric circulation in past, present and future climates
Co-organized by AS1
Convener: Michael Byrne | Co-conveners: Thomas Birner, Nicholas Lutsko, Talia Tamarin
>> Abstract submission

AS1.8 Stratospheric dynamics
Convener: Thomas Reichler | Co-conveners: Blanca Ayarzagüena, Bo Christiansen, Seok-Woo Son
>> Abstract submission

AS1.9 Atmospheric Rossby waves and Jet Dynamics, and their Impacts on Extreme Weather and Climate Events
Co-organized by NP7
Convener: Kai Kornhuber | Co-conveners: Olivia Romppainen-Martius, Rachel White, Volkmar Wirth
>> Abstract submission

AS1.11 Asian Monsoon dynamics and Atmospheric Composition
Convener: Federico Fierli | Co-conveners: Bhupesh Adhikary, Silvia Bucci, Fred Stroh
>> Abstract submission

AS1.14 Internal Gravity Waves
Co-organized by NP7/OS4
Convener: Claudia StephanECS | Co-conveners: Ulrich Achatz, Alvaro de la Camara, Riwal Plougonven, Chantal Staquet
>> Abstract submission

AS3.3 Chemistry, Aerosols and Radiative Forcing in CMIP6-era models
Convener: William Collins | Co-conveners: Piers M. Forster, Paul Griffiths, James M. Keeble, Fiona O’Connor
>> Abstract submission

AS3.5 Atmospheric composition variability and trends
Convener: Oksana Tarasova | Co-conveners: Pedro Jimenez-Guerrero, Euan Nisbet, Andrea Pozzer
>> Abstract submission

AS3.6 The role of the middle atmosphere: composition changes and feedbacks
Convener: Gabriel ChiodoECS | Co-conveners: William Ball, Mohamadou Diallo, Birgit Hassler, Peer Johannes Nowack
>> Abstract submission

AS3.17 Dynamics and chemistry of the upper troposphere and stratosphere
Convener: Marta Abalos | Co-conveners: Hella Garny, Johannes Laube, Amanda Maycock, Tanja Schuck
>> Abstract submission

AS3.22 Polar Ozone and Polar Stratospheric Clouds
Convener: Farahnaz Khosrawi | Co-conveners: Hideaki Nakajima, Michael Pitts, Ines Tritscher
>> Abstract submission

AS3.25 Understanding volcano-climate impacts and the stratospheric aerosol layer
Co-organized by CL4/NH2, co-sponsored by SPARC-SSiRC and CMIP6-VolMIP
Convener: Graham Mann | Co-conveners: Myriam Khodri, Claudia Timmreck, Matthew Toohey, Davide Zanchettin
>> Abstract submission

CL2.5 Predictions of climate from seasonal to (multi)decadal timescales (S2D) and their applications
Co-organized by EOS7/AS4/BG2/CL3.2/HS12
Convener: Taru Sandén | Co-conveners: Daniel Dörler, Dilek FraislECS, Florian Heigl
>> Abstract submission

If your SPARC-related session at EGU is not listed here, please let the SPARC office know!

SPARC Science update: 5 January – 11 January

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

The response of mesospheric H2O and CO to solar irradiance variability in models and observations. By A. Karagodin-Doyennel et al. in Atmospheric Chemistry and Physics.

Assessing trends in atmospheric circulation patterns across North America. By E.T. Smith et al. in the International Journal of Climatology.

Classification of time series of temperature variations from climatically homogeneous regions based on long‐term persistence. By D. Sarvan et al. in the International Journal of Climatology.

Discussion papers – open for comment:

Anthropogenic Reversal of the Natural Ozone Gradient between Northern and Southern Mid-latitudes. By D.D: Parrish et al. in Atmospheric Chemistry and Physics.

An Arctic Ozone Hole in 2020 If Not For the Montreal Protocol. By C. Wilka et al. in Atmospheric Chemistry and Physics.

SPARC Science update: 22 December – 4 January

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

Tracking the stratosphere‐to‐surface impact of Sudden Stratospheric Warmings. By R.J. Hall et al. in the Journal of Geophysical Research: Atmospheres.

Atmospheric blocking events: a review. By A.R. Lupo in the Annals of the New York Academy of Sciences.

Orbital forcing strongly influences seasonal temperature trends during the last millennium. By L.J. Lücke et al. in the Geophysical Research Letters.

Increased turbulence in the Eurasian upper‐level jet stream in winter: past and future. By Y. Lv et al. in Earth and Space Science.

Forecasts of “normal”. By S.J. Mason, C.A.T. Ferro, and W.A. Landman in the Quarterly Journal of the Royal Meteorological Society.

Determining Gravity Wave Sources and Propagation in the Southern Hemisphere by Ray‐Tracing AIRS Measurements. By J.A. Perrett et al. in the Geophysical Research Letters.

Long‐Term Variability and Tendencies in Middle Atmosphere Temperature and Zonal Wind From WACCM6 Simulations During 1850–2014. By K. Ramesh et al. in the Journal of geophysical Research: Atmospheres.

Influence of High Latitude Sudden Stratospheric Warming on Tropical Weather: Observations from a 205 MHz Stratosphere Troposphere Radar and Surface Meteorological Parameters. By R. Remya et al. in Earth and Space Science.

Quantifying the tropical upper tropospheric warming amplification using radio occultation measurements. By P. Vergados et al. in Earth and Space Science.

Announcement: IGAC CATCH Science Seminar Series

The first of the virtual CATCH Science Seminar Series will be held on the 14th January 2021 at 16:00 CEST. This will be a monthly seminar series which will host talks on CATCH related topics with the aim of fostering engaging scientific discussions between researchers on outstanding questions for our communities. The first seminar will be on:

“Aerosol-cloud interactions in the Arctic from an observational and modelling perspective.”

by Prof. Paul Zieger (Stockholm University)
and  Prof. Annica Ekman (Stockholm University)

The seminar will involve scientific presentations from guest speakers (2×15 min talks) followed by smaller group discussions (20 min) before ending with a group plenary session (10 min). If you are interested in attending, please register here.

SPARC Gravity Wave Symposium postponed to March 2022

The covid-19 pandemic is more acute than ever, and unfortunately the probability is high that it will not have passed before the end of 2021.

It has therefore been decided to postpone the 2021 SPARC Gravity Wave Symposium, originally scheduled to be end of September 2021, by half a year to March 28th – April 1st 2022, starting on the morning of March 28th and departing after lunch Friday April 1st. The meeting will thus be back-to-back with the EGU assembly that will be held in Vienna in the following week. The conference site of the now 2022 SPARC Gravity Wave Symposium is located in the medieval center of the vibrant city of Frankfurt.

This SPARC symposium is a continuation of a series of successful similar GW meetings lead-organized by Kevin Hamilton, Joan Alexander, Kaoru Sato, Fuqing Zhang and others over the past couple of decades. The tentative title of the next year’s symposium will be “Atmospheric gravity waves: towards a next-generation representation in weather and climate models”. Research on all aspects of atmospheric gravity waves, including newly emerging topics, will be welcomed but some particular emphases will be given to measurements, simulations, and numerical and theoretical developments, especially those confronting, challenging, and advancing the present-day treatment of gravity waves in atmospheric models.

The web site of the meeting (with information on travel and lodging to be placed there in due time) is

Limited travel-support funds for early-career scientists will be available. Those concerned will be asked to submit an informal application together with an abstract of the work they want to present.

A 2nd announcement will be circulated in June 2021. Colleagues and friends are asked for their understanding for the decision for the postponement, which has not been made light-heartedly.

Co-conveners: Ulrich Achatz, Joan Alexander, Kaoru Sato, Laura Holt, and Riwal Plougonven Meeting secretary: Aurelia Müller

We look forward to your participation in 2022.

Ulrich, Joan, Kaoru, Laura, and Riwal

SPARC Science update: 15 December – 21 December

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

Perspective on Aircraft in the Stratosphere: 50 Years from COMESA through the Ozone Hole to Climate. By A.F. Tuck in the Quarterly Journal of the Royal Meteorological Society.

Effective vertical diffusion by atmospheric gravity waves. By H.-L. Liu in the Geophysical Research Letters.

Unprecedented Observations of a Nascent in Situ Cirrus in the Tropical Tropopause Layer. By I. Reinares Martínez et al. in the Geophysical Research Letters.

The Berkeley Earth Land/Ocean Temperature Record. By R.A. Rohde and Z. Hausfather in Earth System Science Data.

The Energy Modeling Forum (EMF)-30 study on short-lived climate forcers: introduction and overview. By S.J. Smith et al. in Climatic Change.