Dear Colleagues,

We would like to draw your attention to a new Special Section in Geophysical Research Letters and Journal of Geophysical Research: Atmospheres entitled “The Exceptional Arctic Stratospheric Polar Vortex in 2019/2020: Causes and Consequences”. The call for papers for this Special Section and submission information are given below.

We encourage you to consider submitting a paper for this special issue, and to communicate / coordinate with us and your colleagues regarding your plans. We are expecting both quick short papers for GRL and longer more detailed papers that may take more time to prepare (e.g., involving modeling studies or postseason impacts) for JGR and will thus hold the Special Section open for submissions through calendar year 2021.

Please feel free to contact any or all of us with any inquiries or plans related to this Special Section.

Cheers,
">Gloria Manney,
Amy Butler,
Jens-Uwe Grooß,
Krzysztof Wargan,
(Organizers)

Find the call for papers on the JGR webpage

Find the call for papers on the GRL webpage

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

Hadley cell expansion in CMIP6 models. By K.M. Griese and S.M. Davis in Atmospheric Chemistry and Physics.

The Research Unit VolImpact: Revisiting the volcanic impact on atmosphere and climate – preparations for the next big volcanic eruption. By C. von Savigny et al. in the Meteorologische Zeitschrift.

A New Theoretical Framework for Understanding Multiscale Atmospheric Predictability. By Y.Q. Sun and F. Zhang in the Journal of the Atmospheric Sciences.

Discussion papers – open for comment:

Influence of gravity wave temperature anomaly and its vertical gradient on cirrus clouds in the tropical tropopause layer – a satellite-based view. By K.-W. Chang and T. L’Ecuyer in Atmospheric Chemistry and Physics.

Transport model diagnosis of the mean age of air derived from stratospheric samples in the tropics. By H.T. Nguyen et al. in Atmospheric Chemistry and Physics.

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

Assimilation of atmospheric infrasound data to constrain tropospheric and stratospheric winds. By J. Amezcua et al. in the Quarterly Journal of the Royal Meteorological Society.

Examining the impact of multiple climate forcings on simulated Southern Hemisphere climate variability. By A.F. Beraki et al. in Climate Dynamics.

Why are radar data so difficult to assimilate skillfully? By F. Fabry and V. Meunier in the Monthly Weather Review.

Subseasonal Vacillations in the Winter Stratosphere. By :C: Hardiman et al. in the Geophysical Research Letters.

Coupled Stratospheric Chemistry–Meteorology Data Assimilation. Part I: Physical Background and Coupled Modeling Aspects. By R. Ménard et al. in Atmosphere.

Coupled Stratospheric Chemistry–Meteorology Data Assimilation. Part II: Weak and Strong Coupling. By R. Ménard et al. in Atmosphere.

Facility for Climate Assessments (FACTS) – A Community Resource for Assessing Weather and Climate Variability. By D. Murray et al. in the Bulletin of the American Meteorological Society.

Observation of jet stream winds during NAWDEX and characterization of systematic meteorological analysis errors. By A. Schäfler et al. in the Monthly Weather Review.

A tropospheric pathway of the stratospheric quasi-biennial oscillation (QBO) impact on the boreal winter polar vortex. By K. Yamazaki et al. in Atmospheric Chemistry and Physics.

FOUR THEORIES OF THE MADDEN‐JULIAN OSCILLATION. By C. Zhang et al. in the Reviews of Geophysics.

Discussion papers – open for comment:

Superposition of gravity waves with different propagation characteristics observed by airborne and space-borne infrared sounders. By I. Krisch et al. in Atmospheric Chemistry and Physics.

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

4Evaluation of Leading Modes of Climate Variability in the CMIP Archives. By J.T. Fasullo, A.S. Phillips, and C. Deser in the Journal of the Climate.

Eight lessons from COVID-19 to guide our climate response. By K.M. Artier in Eos.

Intercomparison of wind observations from the European Space Agency’s Aeolus satellite mission and the ALADIN Airborne Demonstrator. By O. Lux et al. in Atmospheric Measurement Techniques.

The co-evolution of technological promises, modelling, policies and climate change targets. By D. McLaren and N. Markusson in nature: climate change.

Regionally Varying Assessments of Upper-Level Tropical Width in Reanalyses and CMIP5 Models Using a Tropopause Break Metric. By E.R. Martin et al. in the Journal of the Climate.

Special issue: Advances in convection-permitting climate modelling. By A.F. Prein et al. in Climate Dynamics.

The South Asian Monsoon Circulation in Moist Isentropic Coordinates. By T.P. Sabin and O.M. Pauluis in the Journal of the Climate.

Zonally resolved water vapour coupling with tropical tropopause temperature: Seasonal and interannual variability, and influence of the Walker circulation. By K.V. Suneeth and S.S. Das in Climate Dynamics.

Earth 2020: Science, society, and sustainability in the Anthropocene. By P.D. Tortell in PNAS.

The Coupled Model Intercomparison Project: History, uses, and structural effects on climate research. By L. Touzé-Peiffer, A. Barberousse, and H. Le Treut in WIREs Climate Change.

Role of tropical variability in driving decadal shifts in the Southern Hemisphere summertime eddy-driven jet. By D. Yang et al. in the Journal of the Climate.

Discussion papers – open for comment:

ESD Reviews: mechanisms, evidence, and impacts of climate tipping elements. By S. Wang and Z. Hausfather in Earth System Dynamics

Due to COVID-19, AGU has extended the deadline to submit a Fall Meeting session, town hall, workshop and innovative session proposal until Thursday, 23 April 2020.

Find submission webpage

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

Decadal wintertime temperature changes in East Asia during 1958‐2001 and the contributions of internal variability and external forcing. By M. Luo et al. in the Journal of Geophysical Research: Atmospheres.

Dynamical and thermodynamical drivers of variability in European summer heat extremes. By L. Suarez-Gutierrez, et al. in Climate Dynamics.

Evaluation of the CAMS global atmospheric trace gas reanalysis 2003–2016 using aircraft campaign observations. By Y. Wang et al. in Atmospheric Chemistry and Physics.

Discussion papers – open for comment:

Global-scale distribution of ozone in the remote troposphere from ATom and HIPPO airborne field missions. By I. Bourgeois et al. in Atmospheric Chemistry and Physics.

Intra-annual variations of spectrally resolved gravity wave activity in the UMLT region. By R. Sedlak et al. in Atmospheric Measurement Techniques.

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

Spatiotemporal variability and trends in global solar radiation over Poland based on satellite‐derived data (1986–2015). By K. Kulesza in the International Journal of Climatology.

Towards an unbiased stratospheric analysis. By P. Laloyaux et al. in the Quarterly Journal of the Royal Meteorological Society.

Dehydration and low ozone in the tropopause layer over the Asian monsoon caused by tropical cyclones: Lagrangian transport calculations using ERA-Interim and ERA5 reanalysis data. By D. Li et al. in Atmospheric Chemistry and Physics.

CASEarth Poles: Big Data for the Three Poles. By X. Li et al. in the Bulletin of the American Meteorological Society.

Progress in simulating the Quasi‐biennial Oscillation in CMIP models. By J.H. Richter et al. in the Journal of Geophysical Research: Atmospheres.

Jet Latitude Regimes and the Predictability of the North Atlantic Oscillation. By K. Strommen in the the Quarterly Journal of the Royal Meteorological Society.

Can the world’s most influential climate report carry on? Nature News Q&A with Valérie Masson-Delmotte by Jeff Toffefson.

How COVID-19 could ruin weather forecasts and climate records. Nature news article by G. Viglione.

Discussion papers – open for comment:

Airborne measurements and large-eddy simulations of small-scale Gravity Waves at the tropopause inversion layer over Scandinavia. By S. Gisinger et al. in Atmospheric Chemistry and Physics.

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

Towards the closure of momentum budget analyses in the WRF (v3.8.1) model. By T.-C. Chen, M.-K. Yau, and D.J. Kirschbaim in Geoscientific Model Development.

Insights from Earth system model initial-condition large ensembles and future prospects. By C. Deser et al. in nature: climate change.

Can the issuance of hazardous-weather warnings inform the attribution of extreme events to climate change? By D.R. Durran in the Bulletin of the American Meteorological Society.

An endless summer: 2018 heat episodes in Europe in the context of secular temperature variability and change. By A. Hoy, S. Hänsel, and M. Maugeri in the International Journal of Climatology.

Maximum and Minimum Air Temperature Lapse Rates in the Andean region of Ecuador and Peru. By F. Navarro-Serrano et al. in the International Journal of Climatology.

Description and Evaluation of the specified-dynamics experiment in the Chemistry-Climate Model Initiative. By C. Orbe et al. in Atmospheric Chemistry and Physics.

Quantifying the radiative impact of clouds on tropopause layer cooling in tropical cyclones. By L. Ricoire et al. in the Journal of the Climate.

Discussion papers – open for comment:

A convolution of observational and model data to estimate age of air spectra in the northern hemispheric lower stratosphere. By M. Hauck et al. in Atmospheric Chemistry and Physics.

Impact of the eruption of Mt. Pinatubo on the chemical composition of the stratosphere. By M. Kilian, S. Brinkop and P. Jöckel in Atmospheric Chemistry and Physics.

Find meeting webpage

We cordially invite you to save the dates on your calendar for the 2021 SPARC Gravity Wave Symposium now scheduled to be the week of 27 September—1 October 2021 starting on the morning of September 27th and departing after lunch Friday October 1st on the Westend (downtown) campus of the Goethe University Frankfurt in Frankfurt/Main, Germany: https://www.goethe-university-frankfurt.de

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.

Further logistics will be forthcoming but at this point we would like you to save the dates, and also please preregister on the web site below which will guide us in negotiating how many rooms and seats are needed for the symposium. We understand at this point your response will not be binding. The web-site address is:

https://express.converia.de/frontend/index.php?sub=529

Please also feel free to forward this announcement to whoever might be interested. Your help in this regard would be appreciated. We also apologize for the case you are receiving the announcement several times.

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

We look forward to your participation.

Best regards, and stay healthy,

Ulrich, Joan, and Kaoru

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

Rare ozone hole opens over Arctic — and it’s big. Nature news article

Decades-old refrigerators and insulation from buildings are leaking ozone-destroying chemicals: nations must act. Editorial, nature.

A pause in Southern Hemisphere circulation trends due to the Montreal Protocol. By A. Banerjee et al. in nature.

International regulations have paused a jet-stream shift in the Southern Hemisphere. By A.Y. Karpechko, in nature news & views.

On the changing role of the stratosphere on the tropospheric ozone budget: 1979‐2010. By P.T. Griffiths et al. in the Geophysical Research Letters.

Breakdown of the Linear Relationship between the Southern Hemisphere Hadley Cell Edge and Jet Latitude Changes in the Last Glacial Maximum. By S.-Y. Kim and S.-W. Son in the Journal of the Climate.

Modeling stratospheric intrusion and trans-Pacific transport on tropospheric ozone using hemispheric CMAQ during April 2010 – Part 1: Model evaluation and air mass characterization for stratosphere–troposphere transport. By S. Itahashi, et al. in Atmospheric Chemistry and Physics.

Response of the Asian summer Monsoons to a high-latitude thermal forcing: mechanisms and nonlinearities. By S. Talento et al. in Climate Dynamics.

The interaction between moist convection and the atmospheric circulation in the tropics. By L. Tomassini in the Bulletin of the American Meteorological Society.

The influence of zonally asymmetric stratospheric ozone changes on the Arctic polar vortex shift. By J. Zhang et al. in the Journal of the Climate.

Discussion papers – open for comment:

Differing responses of the QBO to SO2 injections in two global models. By U. Niemeier, J.H. Richter and S. Tilmes in Atmospheric Chemistry and Physics.