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.

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

Local Ensemble Transform Kalman Filter with Cross Validation. By M. Buehner in the Monthly Weather Review.

Synthesis of methane observations across scales: Strategies for deploying a multi‐tiered observing network. By D.H. Cusworth et al. in the Geophysical Research Letters.

Impact of Sub‐Grid Variation of Water Vapor on Longwave Radiation in a General Circulation Model. By S. Kim, S. Park, and J. Shin in the Journal of Advances in Modeling Earth Systems.

The practice of responsible research and innovation in “climate engineering.” By S. Low and J.J. Buck in WIREs Climate Change.

Thermodynamic cycles in the stratosphere. By P. Ruggieri, M.H.P. Ambaum, and J. Nycander in the Journal of the Atmospheric Sciences.

Earth System Model Evaluation Tool (ESMValTool) v2.0 – technical overview. By M. Righi et al. in Geoscientific Model Development.

Spatio‐temporal stability analysis applied to monsoon anticyclone flow. By P.M. Rupp and P.H. Haynes in the Quarterly Journal of the Royal Meteorological Society.

VolKilau: Volcano rapid response balloon campaign during the 2018 Kilauea eruption. By J.-P. Vernier et al. in the Bulletin of the American Meteorological Society.

Discussion papers – open for comment:

Simplified SAGE II ozone data usage rules. By S. Kremser, L.W. Thomason, and L.J. Bird in Earth System Science Data.

Earth System Model Evaluation Tool (ESMValTool) v2.0 – diagnostics for emergent constraints and future projections from Earth system models in CMIP. By A. Lauer et al. in Geoscientific Model Development.

Long-term Variations in Ozone Levels in the Troposphere and Lower Stratosphere over Beijing: Observations and Model Simulations. By Y. Zhang 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).

Topographic Influence on the African Easterly Jet and African Easterly Wave Energetics. H.L. Hamilton et al. in the Journal of Geophysical Research: Atmospheres.

Infrasound and Gravity Waves Over the Andes Observed by a Pressure Sensor on Board a Stratospheric Balloon. G. Poler et al. in the Journal of Geophysical Research: Atmospheres.

Exploring the Need for Reliable Decadal Prediction. Workshop report by S. Sandgathe et al. in the Bulletin of the American Meteorological Society.

Composite synoptic-scale environments conducive to North American polar–subtropical jet superposition events. By A.C. Winters et al. in the Monthly Weather Review.

Seasonal forecasts of the 20th Century. By A. Weisheimer et al. in the Bulletin of the American Meteorological Society.

An Estimate of the Relative Contributions of Sea Surface Temperature Variations in Various Regions to Stratospheric Change. By F. Xie et al. in the Journal of the Climate.

Discussion papers – open for comment:

The effect of interactive ozone chemistry on weak and strong stratospheric polar vortex events. By J. Oehrlein, G. Chiodo, and L.M. Polvani 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).

Little influence of Arctic amplification on mid-latitude climate. By A. Dai and M. Song in nature: climate change.

The Structure of Climate Variability Across Scales. By C.L.E. Franzke et al. in the Reviews of Geophysics.

Intensified Investigations of East Asian Aerosols and Climate. By Z. Li in Earth and Space Science News (EOS).

The influence of DACCIWA radiosonde data on the quality of ECMWF analyses and forecasts over southern West Africa. By R. van der Linden et al. in the Quarterly Journal of the Royal Meteorological Society.

Mountain waves produced by a stratified boundary layer flow. Part I: Hydrostatic case. By F. Lott, B. Deremble and C. Soufflet in the Journal of the Atmospheric Sciences.

A regime perspective on the North Atlantic eddy-driven jet response to sudden stratospheric warmings. By A.C. Maycock et al. in the Journal of the Climate.

How Useful is a Linear Ozone Parameterization for Global Climate Modeling? By K. Meraner, S. Rast, and H. Schmidt in the Journal in Advances in Modeling Earth Systems.

Scenarios science needed in UNFCCC periodic review. By C.-F Schleussner and C.L. Fyson in nature climate change.

The Global Teleconnection Signature of the Madden‐Julian Oscillation and its Modulation by the Quasi‐Biennial Oscillation. By B.A. Toms et al. in the Journal of Geophysical Research: Atmospheres.

Comparative assessment of climate engineering scenarios in the presence of parametric uncertainty. By G.T. Tran, A. Oschlies, and D.P. Keller in the Journal of Advances in Modeling Earth Systems.

Discussion papers – open for comments:

Representation of the Equatorial Stratopause Semiannual Oscillation in Global Atmospheric Reanalyses. By Y. Kawatani et al. in Atmospheric Chamistry and Physics.

Integrative and comprehensive Understanding on Polar Environments (iCUPE): the concept and initial results. By T. Petäjä et al. in Atmospheric Chemistry and Physics.

New insights into Rossby wave packet properties in the extratropical UTLS using GNSS radio occultations. By R. Pilch Kedzierski, K. Matthes and K. Bumke 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).

Uncertainty in the response of sudden stratospheric warmings and stratosphere‐troposphere coupling to quadrupled CO2 concentrations in CMIP6 models. By B. Ayarzagüena et al. in the Journal of Geophysical Research: Atmospheres.

Linking midlatitudes eddy heat flux trends and polar amplification. By R. Chemke and L.M. Polvani in in nature partner journals: Climate and Atmospheric Science.

A comprehensive assessment of tropical stratospheric upwelling in the specified dynamics Community Earth System Model 1.2.2 – Whole Atmosphere Community Climate Model (CESM (WACCM)). By N.A. Davis et al. in Geoscientific Model Development.

On the Role of Rossby Wave Breaking in the Quasi‐Biennial Modulation of the Stratospheric Polar Vortex during Boreal Winter. By H. Lu et al. in the Quarterly Journal of the Royal Meteorological  Society.

Simulation of convective moistening of the extratropical lower stratosphere using a numerical weather prediction model. By Z. Qu et al. in Atmospheric Chemistry and Physics.

Dependence of sudden stratospheric warmings on internal and external drivers. By A. Salminen et al. in the Geophysical Research Letters.

South Asian monsoon response to weakening of Atlantic meridional overturning circulation in a warming climate. By N. Sandeep et al. in Climate Dynamics.

Discussion papers – open for comments:

Trends of atmospheric water vapour in Switzerland from ground-based radiometry, FTIR and GNSS data. By L. Bernet et al. in Atmospheric Chemistry and Physics.

Gravitational separation of Ar/N2 and age of air in the lowermost stratosphere in airborne observations and a chemical transport model. By B. Birner et al. in Atmospheric Chemistry and Physics.

Lagrangian Gravity Wave spectra in the lower stratosphere of current (re)analyses. By A. Padglajen et al. in Atmospheric Chemistry and Physics.