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.

iCACGP and IGAC have announced the bid solicitation for the host location and local organizing committee (LOC) for the 2022 International Atmospheric Chemistry Conference is now open!

They recognize the effort it takes for any LOC to organize and run an international conference. In order to focus potential bidders on key issues,  guidelines are provided, based on the integrated experience of overseeing recent iCACGP Symposia/IGAC Science Conferences.  Please refer to these guidelines when preparing your bid.

The deadline for bid submissions is 24 April 2020.

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

Evaluation of the Quasi‐Biennial Oscillation in global climate models for the SPARC QBO‐initiative. By A.C. Bushell et al. in the Quarterly Journal of the Royal Meteorological Society.

QBO changes in CMIP6 climate projections. By N. Butchart et al. in the Geophysical Research Letters.

First detection of a Brief Mesoscale Elevated Stratopause in very early winter. By M. García-Comas et al. in the Geophysical Research Letters.

The Impact of the Stratosphere on the MJO in a Forecast Model. By Z. Martin et al. in the Journal of Geophysical Research: Atmospheres.

Impact of satellite observations on forecasting sudden stratospheric warmings. By S. Noguchi et al. in the Geophysical Research Letters.

Impact of Quasi-Biennial Oscillation on the northern winter stratospheric polar vortex in CMIP5/6 models. By J. Rao, C.I. Garfinkel, and I.P. White in the Journal of the Climate.

Technical note: Intermittent reduction of the stratospheric ozone over northern Europe caused by a storm in the Atlantic Ocean. By M. Sofiev et al. in Atmospheric Chemistry and Physics.

Seasonality of the MJO impact on upper troposphere/lower stratosphere temperature, circulation and composition. By O.V. Tweedy, L.D. Oman, and D.W. Waugh in the Journal of the Atmospheric Sciences.

Discussion papers – open for comment:

Impact of convection on the upper-tropospheric composition (water vapor/ozone) over a subtropical site (Réunion Island, 21.1° S–55.5° E) in the Indian Ocean. By D. Héron et al. in Atmospheric Chemistry and Physics.

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

Study of the dependence of stratospheric ozone long-term trends on local solar time. By E.Maillard Barras et al. in Atmospheric Chemistry and Physics.

Investigating stratospheric changes between 2009 and 2018 with aircraft, AirCores, and a global model focusing on CFC-11. By J.C. Laube et al. in Atmospheric Chemistry and Physics.

Joint WCRP and DCMIP Summer School on Earth System Model Development: Dynamical cores and physics-dynamics coupling

Dates: August 10-14. 2020

Location: Mesa Lab, National Center for Atmospheric Research (NCAR), Boulder, CO, USA

The Dynamical Core Model Intercomparison Project (DCMIP) and its joint World Climate Research Programme (WCRP) Summer School highlights the newest modeling techniques for global Earth system models. The overarching theme of this summer school is physics-dynamics coupling.

The objectives of the joint WRCP and DCMIP Summer School are (1) to teach a group of 30 extraordinary multi- disciplinary students and postdocs how today’s and future atmospheric models are or need to be built, and (2) to use idealized test cases to expose selected model design choices in simplified modeling frameworks based on NCAR’s Community Earth System Model (CESM) and the Department of Energy’s (DOE’s) Energy Exascale Earth System Model (E3SM). DCMIP-2020 thereby continues the DCMIP-2008, DCMIP-2012 and DCMIP-2016 model intercomparison and summer school series as well as the 1st and 2nd WCRP summer school series on Climate Model Development.

The application period will open on March/31/2020 and will stay open until May/1/2020. Invitations to the summer school will be sent by mid May 2020.

MORNING SUMMER SCHOOL

Morning lectures from experts in the field on select topics associated with atmospheric model theory, design and development. Topics include:

– Introduction to Earth System Modeling
– Numerical methods
– Computational performance + challenges
– Physics parameterizations
– Diffusion, filters and fixers
– Physics-dynamics coupling
– Invariant conservation
– Tracer transport
– Model verification and validation

AFTERNOON WORKSHOP

Practical hands-on afternoon sessions run by model leads where students will execute and explore the dynamical cores of CESM (for example, NOAA’s FV3 dynamical core and NCAR’s version of the spectral-element dynamical core) and E3SM (DOE’s non-hydrostatic spectral-element dynamical core) in a simplified model framework. Test cases include Held-Suarez, aquaplanet, radiative-convective equilibrium, and weather forecast experiments.

FOR MORE INFORMATION

https://www.earthsystemcog.org/projects/dcmip-2020/ or contact 

Sponsors include the National Science Foundation (NSF), the U.S. Department of Energy (DOE), the World Climate Research Programme (WCRP), the National Center for Atmospheric Research (NCAR), and the National Oceanic and Atmospheric Administration (NOAA).

Travel support is available for approximately 30 students and postdocs. Registration will open on or about March 31, 2020 and close May 1, 2020. Invitations will be sent out by May 15, 2020.

Organizing Committee:

Peter Lauritzen, NCAR
Adam Herrington, NCAR
Christiane Jablonowski, University of Michigan
Hugh Morrison, NCAR
Kevin Reed, Stony Brook University
Mark Taylor, Sandia National Laboratories
Paul Ullrich, University of California Davis
Colin Zarzycki, Pennsylvania State University

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.

Effects of missing gravity waves on stratospheric dynamics; part 1: climatology. By R. Eichinger et al. in Climate Dynamics.

Environmental catastrophes, climate change, and attribution. By E.A. Lloyd and T.G. Shepherd in the Annals of the New York Academy of Sciences.

Boreal winter stratospheric variability in EC-EARTH: High-Top versus Low-Top. By F. Palmeiro et al. in Climate Dynamics.

Describing the relationship between a weather event and climate change: a new statistical approach. By A. Ribes, S. Thao, and J. Cattiaux in the Journal of the Climate.

Response of middle atmospheric temperature to the 27 d solar cycle: an analysis of 13 years of microwave limb sounder data. By P. Rong et al. in Atmospheric Chemistry and Physics.

Tropical widening: From global variations to regional impacts. By P.W. Staten et al. in the Bulletin of the American Meteorological Society.

Gravity wave excitation during the coastal transition of an extreme katabatic flow in Antarctica. By É. Vignon et al. in the Journal of the Atmospheric Sciences.

Independent and Joint Influences of Eastern Pacific El Niño–Southern Oscillation and Quasi‐biennial Oscillation on Northern Hemispheric Stratospheric Ozone. By F. Xie et al. in the International Journal of Climatology.

• Fill out the IGAC SSC Nomination Form.
• Upload the nominee’s CV and publication list (if not part of the CV).
• Upload a statement from the nominee on “Why do you want to serve on the IGAC SSC and what will you bring to IGAC?” The statement should be ~300 words or less.
• Provide in the form a reason for the nomination.

• Fill out the IGAC SSC Self-Nomination Form.
• Upload your CV and publication list (if not part of the CV).
• Upload a letter of support from someone in the international scientific community.
• Provide a statement on “Why do you want to serve on the IGAC SSC and what will you bring to IGAC?”. The statement should be ~300 words or less.