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Earlier posts (starting in 2012) March 2018 Now out in Geoscientific Model Development, Isca, v1.0: a framework for the global modelling of the atmospheres of Earth and other planets at varying levels of complexity by Geoff Vallis and collaborators. February 2018 Submitted to the Journal of Climate: The Circulation Response to Volcanic Eruptions: The Key Roles of Stratospheric Warming and Eddy Interactions, led by Kevin DallaSanta! and now in print, Optimizing the definition of a sudden stratospheric warming, led by Amy Butler. Supplemental information. January 2018 Just submitted to J. Climate, The Downward Influence of Sudden Stratospheric Warmings: Association with Tropospheric Precursors, led by Ian White, and now in press with Geophysical Model Development, A Framework for the Global Modelling of the Atmospheres of Earth and Other Planets at Varying Levels of Complexity, led by Geoff Vallis. October 2017 Submitted to the Geoscience Model Development: Isca: A Framework for the Global Modelling of the Atmospheres of Earth and Other Planets at Varying Levels of Complexity, led by Geoff Vallis and his group at Exeter. September 2017 Just submitted to the Journal of Climate: Optimizing the definition of a sudden stratospheric warming, led by Amy Butler! Here is the supplemental information. and in print with Nature Geoscience, The strength of the meridional overturning circulation of the stratosphere! August 2017 Now in print: Untangling the annual cycle of the tropical tropopause layer with an idealized moist model. Nicely done, Martin! July 2017 Marianna's paper, The strength of the meridional overturning circulation of the stratosphere, has been accepted by Nature Geoscience! And now in print in the Journal of Climate: Defining Sudden Stratospheric Warmings in Models: Accounting for Biases in Model Climatologies, a study led by Junsu Kim. June 2017 Accepted in the Journal of Climate: Untangling the annual cycle of the tropical tropopause layer with an idealized moist model, led by Martin Jucker! and for those of you attending the AMS meeting in Portland this month, don't miss Amy Butler on defining SSWs Kevin DallaSanta on the circulation response to volcanic forcing. Aman Gupta on understanding transport biases in general circulation models Marianna Linz on the strength of the Brewer-Dobson Circulation ... and the theory we needed to quantify it Seok-Woo Son's take on how to assess SSWs in models Ian White on the downward influence of SSWs (if the line at the reception is too long!) my poster on using MiMA to probe the relationship between convective parameterization and the circulation response to global warming and lastly, if you can eat your Tuesday lunch quickly enough, our town hall on simpler models within the CESM framework! March 2017 Just accepted in the Journal of Climate: Defining Sudden Stratospheric Warmings in Models: Accounting for Biases in Model Climatologies, led by Junsu Kim. February 2017 Introducing our new "Model of idealized Moist Atmosphere" (MiMA): Untangling the annual cycle of the tropical tropopause layer with an idealized moist model: Tropical versus extratropical control, just submitted to the Journal of Climate! and submitted to Nature Geoscience: The strength of the meridional overturning circulation of the stratosphere, led by Marianna Linz! January 2017 In this month's issue of JAS: What makes an annular mode "annular"? and now in print in ACP: Introduction to the SPARC Reanalysis Intercomparison Project (S-RIP) and overview of the reanalysis systems December 2016 Revised for Journal of Climate: Defining Sudden Stratospheric Warmings in Models: Accounting for Biases in Model Climatologies, lead by Junsu Kim. and accepted in ACPD, an introduction to the S-RIP project, led by Masatomo Fujiwara and Jonathon Wright. November 2016 Now in press in the Journal of the Atmospheric Sciences: connecting the diabatic circulation with the age of air, lead by Marianna Linz. October 2016 Just accepted in the Journal of the Atmospheric Sciences, a collaboration with Dave Thompson: What makes an annular mode "annular"? September 2016 In print in the Journal of Climate, The rain is askew: Two idealized models relating the vertical velocity and precipitation distributions in a warming world, and in Geophysical Model Development, The Dynamics and Variability Model Intercomparison Project (DynVarMIP) for CMIP6: Assessing the stratosphere–troposphere system. August 2016 Accepted in JAS: connections between the diabatic circulation and the age of air, lead by Marianna Linz. The ultimate goal is to link tracer measurements to circulation metrics! published in GMD: The Volcanic Model Intercomparison Project (VolMIP) July 2016 Please see our introduction to the S-RIP project, led by Masatomo Fujiwara and Jonathon Wright, submitted to ACP. June 2016 Please check out our new paper, just sent to JAS: What makes an annular mode "annular"? and submitted to the Journal of Climate: Defining Sudden Stratospheric Warmings in Models: Accounting for Biases in Model Climatologies. May 2016 Just accepted in the Journal of Climate, what very simple models can tell us about the precipitation response to global warming. April 2016 The Coupled Model Intercomparison Project, Phase 6 (CMIP6) is taking shape: The Volcanic Model Intercomparison Project (VolMIP); I'm particilarly excited about the short term experiments focussed on the circulation response to volcanic eruptions The DynVar Diagnostic MIP (DynVarMIP): collecting the diagnostics needed to assess atmospheric dynamics in CMIP6 models February 2016 In print in GRL, our case that the BDC is primarily being lifted by global warming, rather than increased, lead by Sophie Oberlaender-Hayn at Free University Berlin. January 2016 Now in print in the Journal of Climate, our paper on Constraining Future Austral Jet Stream Position and Shifts in the CMIP5 Ensemble by Process-oriented Multiple Diagnostic Regression. See also the supplementary figures. October 2015 Now in press, Rossby waves mediate impacts of tropical oceans on West Antarctic atmospheric circulation, part of a special collection in the Journal of Climate on tropical-polar connections. September 2015 My entry on the Stratosphere and its Coupling to the Troposphere and Beyond, part of the 1676 page tome Encyclopedia of Applied and Computational Mathematics, out this month from Springer-Verlag. July 2015 Start spreading the news . . . I'm back in New York, New York after a wonderful sabbatical in Berlin! June 2015 In print in JAS, our study on the season cycle and variability of the stratospheric polar vortex. Congratulations to lead author Aditi Sheshadri. March 2015 Now in print in the J. Climate, our study on a Rossby wave bridge from the tropical Atlantic to the Amundsen Sea, led by Xichen Li. December 2014 Something off the beaten path: The Mystery of the Missing Frost, an article by Becca Cudmore in Nautilus, a quirky science magazine November 2014 More on CMIP6 (the Coupled Model Intercomparison Project, Phase 6): Please see our revised proposal for a Volcanic Model Intercomparison Project (VolMIP), and DynVar's proposal for a diagnostic MIP, a formal request to archive the model output we need to undestand the dynamics of stratosphere-troposphere coupling. October 2014 In this month's issue of JAS, Naftali Cohen's paper: What drives the Brewer-Dobson Circulation? and just published online in the Quarterly Journal, a review paper on the predictability of the stratosphere and its impact on tropospheric forecasts, led by Om Tripathi. July 2014 Now in print in the Journal of Climate, our paper on the response of the austral circulation to ozone and greenhouse gas forcing. and in the J. Geophysical Research - Atmospheres, our paper on stratosphere-troposphere coupling in CMIP5 models, led by Elisa Manzini and Alexey Karpechko. May 2014 Ich bin ein Berliner! I've just started a sabbatical year in Berlin, visiting the Max Planck Institue for Meterology in Hamburg, Free University, and NYU-Berlin. Just as I depart the country, a new graduate student, Megan Lytle, is joining the group! And last but not least, congratulations to the graduates. Portia Chan is now heading out for greener pastures and a masters degree at Berkeley! March 2014 Congratulations to Dr. Xichen Li on a successful thesis defense, and for nabbing a postdoctoral fellowship at the Scripps Institution of Oceanography! February 2014 Times are a changin' in my group! First, Naftali Cohen is now a postdoctoral research scientist at Yale University with Bill Boos. Congratulations! Second, my tenure docket has been approved. I'm excited to be a permanent member of the Courant Institute! January 2014 Congratulations to Xichen, lead author on our Nature paper on the impact of tropical North Atlantic SSTs on Antarctic climate. See commentary by John King from the British Antarctic Survey as well. And now in print in JAS, our paper on eddy feedbacks and the time scales of jet variability in a two layer QG model. December 2013 Now in print in JAS, our paper on compensation between gravity waves and resolved waves. November 2013 Congratulations to Dr. Naftali Cohen on a successfull PhD defense, 13 November 2013! September 2013 My 90 seconds of fame ... check out this brief video on the role of chloroflourocarbons (CFCs) and hydrofluorocarbons (HFCs) in climate. I give James West full credit for turning my long-winded rambling into something so concise! July 2013 I've joined thec editorial board at the Quarterly Journal of the Royal Meteorological Society as an assistant editor. We're looking for quality papers on atmospheric research! June 2013 Now in print in JAS, our paper on the impact of high latitude waves on tropical upwelling in the stratosphere, also in print in J. Climate, our paper on the Hadley Cell response to ENSO vs. global warming, and last, but not least, our position paper on Climate Processes: Clouds, Aerosols, and Dynamics was included in the 485 page tome Climate Science for Serving Society: Research, Modeling and Prediction Priorities. May 2013 I've joined the SPARC-Reanalysis Intercomparison Project (S-RIP), leading the chapter on stratosphere-troposphere coupling with Yulia Zyulyaeva. Here's a short presentation on the goals of our chapter. Welcome Po Shuen (Portia) Chan, an NYU undergraduate student, to the research group! April 2013 Congratulations to Ho Yeung Hung for passing his general exams! March 2013 Finally in print in the Journal of Climate: The Effect of Tropospheric Jet Latitude on Coupling between the Stratospheric Polar Vortex and the Troposphere. and now in print in JGR, the representation of the stratosphere in CMIP5 models October 2012 Now in print: The role of stratosphere-troposphere coupling in the occurrence of extreme winter cold spells over Northern Europe. September 2012 In this month's issue of JAS: Stratospheric versus Tropospheric Control of the Strength and Structure of the Brewer-Dobson Circulation July 2012 Two manuscripts now in print! Please see our papers on the stratosphere's role in weather and climate in BAMS and the potential role of dynamical regimes in abrupt climate change in J. Climate.