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

The SPARC water vapour assessment II: profile-to-profile comparisons of stratospheric and lower mesospheric water vapour data sets obtained from satellites. By S. Lossow et al. in Atmospheric Measurement Techniques.

The role of the stratospheric polar vortex for the austral jet response to greenhouse gas forcing. By P. Ceppi and T.G. Shepherd in the Geophysical Research Letters.

Model Variable Augmentation (MVA) for Diagnostic Assessment of Sensitivity Analysis Results. By J. Mai and B.A. Tolson in Water Ressources Research.

Age of air from different reanalyses and methods. By F. Ploeger et al. in Atmospheric Chemistry and Physics.

What is the impact of additional tropical observations on a modern data assimilation system? By L.C. Slivinski et al. in the Monthly Weather Review.

Lagrangian simulations of the transport of young air masses to the top of the Asian monsoon anticyclone and into the tropical pipe. By B. Vogel et al. in Atmospheric Chemistry and Physics.

Climatology and dynamics of the link between dry intrusions and cold fronts during winter. Part I: global climatology. By J.L. Catto and S. Raveh-Rubin in Climate Dynamics.

Climatology and dynamics of the link between dry intrusions and cold fronts during winter, Part II: Front-centred perspective. By S. Raveh-Rubin and J.L. Catto in Climate Dynamics.

Discussion papers – open for comment:

Revisiting the Agung 1963 volcanic forcing – impact of one or two eruptions. By U. Niemeier, C. Timmreck, and K. Krüger 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).

An Objective Procedure for Delineating the Circumpolar Vortex. By N. Bushra and R.V. Rohli in Earth and Space Science.

A New Road Map for Assessing the Effects of Solar Geoengineering. By T. Cook in Earth & Space Science News (EOS).

Eddy influences on the Hadley circulation. By N.A. Davis and T. Birner in the Journal of Advances in Modeling Earth Systems.

US Temperatures: Time Trends and Persistence. By L.A. Gil-Alana and L. Sauci in the International Journal of Limatology.

Extreme weather events in early summer 2018 connected by a recurrent hemispheric wave-7 pattern. By K. Kornhuber et al. in the Environmental research letters.

Ural Blocking as a driver of early winter stratospheric warmings. By Y. Peings in the Geophysical Research Letters.

Mechanism of ozone loss under enhanced water vapour conditions in the mid-latitude lower stratosphere in summer. By S. Robrecht et al. in Atmospheric Chemistry and Physics.

Inference of stochastic parametrizations for model error treatment using nested ensemble Kalman filters. By G. Scheffler, J. Ruiz, and M. Pulido in the Quarterly Journal of the Royal Meteorological Society.

Challenges to the sustainability of climate services in Europe. By M.B. Soares and C. Buontempo in WIREs Climate Change.

Drivers and surface signal of inter‐annual variability of boreal stratospheric final warmings. By R. Thiéblemont et al. in the Journal of Geophysical Research: Atmospheres.

Global tropopause altitudes in radiosondes and reanalyses. By T. Xian and C.R. Homeyer in Atmospheric Chemistry and Physics.

Response of the northern stratosphere to the Madden‐Julian oscillation during boreal winter. By C. Yang et al. in the Journal of Geophysical Research: Atmospheres.

The global warming hiatus has faded away: an analysis of 2014–2016 global surface air temperatures. By C. Zhang, et al. in the International Journal of Climatology.

Climate models can correctly simulate the continuum of global-average temperature variability. By F. Zhu et al. in the Proceedings of the National Academy of Sciences of the United States of America.

Discussion papers – open for comment:

Perfluorocyclobutane (PFC-318, c-C4F8) in the global atmosphere. By J. Mühle et al. in Atmospheric Chemistry and Physics.

Impact of convectively lofted ice on the seasonal cycle of tropical lower stratospheric water vapor. By X. Wang et al. in Atmospheric Chemistry and Physics.

The deadline to submit abstracts for the CCMi science workshop and summer school

August 7 – 9, 2019 at the Chinese University of Hong Kong

has been extended until 10 May 2019.

You can find more information and a link to the IGAC Event Abstract Submission System to register and submit abstracts on the workshop webpage:
http://www.cuhk.edu.hk/sci/essc/tgabi/CCMI-WS/ccmi_2019_hongkong_welcome.html

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

New Studies Highlight Challenge of Meeting Paris Agreement Climate Goals. Press release in Earth & Space Science News (EOS).

Trials, errors and improvements in co-production of climate services. By E.W. Kolstad et al. in the Bulletin of the American Meteorological Society.

The Influence of Mesoscale Atmospheric Circulation on Spitsbergen Air Temperature in Periods of Arctic Warming and Cooling. By E.B. Łupikasza and T. Niedźwiedź in the Journal of Geophysical Research: Atmospheres.

Meteorological Source Variability in Atmospheric Gravity Wave Parameters Derived From a Tropical Infrasound Station. By G.J. Marlton et al. in the Journal of Geophysical Research: Atmospheres.

Global 5G wireless networks threaten weather forecasts. By A. Witze; News article in Nature.

Large-scale transport into the Arctic: the roles of the midlatitude jet and the Hadley Cell. By H. Yang et al. in Atmospheric Chemistry and Physics.

Discussion papers – open for comment:

Impact of poleward heat and moisture transports on Arctic clouds and climate simulation. By E.-H. Baek et al. in Atmospheric Chemistry and Physics.

Chlorine partitioning in the lowermost Arctic vortex during the cold winter 2015/2016. By A. Marsing et al. in Atmospheric Chemistry and Physics.

The abstract submission deadline for the 2019 CCMI Science Workshop in Hong Kong August 7 – 9th is on April 30th.

You can find more information and a link to the IGAC Event Abstract Submission System to register and submit abstracts on the workshop webpage:
http://www.cuhk.edu.hk/sci/essc/tgabi/CCMI-WS/ccmi_2019_hongkong_welcome.html

The workshop organizers are currently working on organizing a list of keynote and invited speakers that will motivate our thinking across a wide range of topics that connect with chemistry-climate modelling and would very much like you to join us in Hong Kong.

The second joint AerChemMIP / RFMIP / PDRMIP Workshop in support of CMIP

New Science from CMIP6 multi-model composition-forcing-response experiments

Download third announcement (PDF, 0.3 MB)

June 11th – 14th, 2019
Room A006, Friend Center, 65 Olden St, Princeton, New Jersey 08540, USA

Deadlines:

Abstract submission: April 26 2019,
Registration: May 2 2019

Workshop Goals:

Discuss the use of AerChemMIP, RFMIP, and PDRMIP integrations and diagnostics to advance our understanding of composition, forcing and feedback processes for better constraints on past changes and future projections.

Below are few examples of questions we are interested in discussing, with a full list provided on the website:

• How do the different short- and long-lived constituents contribute to the regional trends in radiative forcing?
• How has atmospheric composition and oxidizing capacity evolved in response to natural and anthropogenic drivers?
• What are the implications of composition changes for air quality and radiative forcing?
• What is the response of natural emissions to anthropogenic influences?
• What are the local and remote temperature and precipitation responses induced from changes in composition?
• How does model diversity in radiative forcing translate to diversity in precipitation and temperature?
• What is the role of uncertainty in radiative transfer parametrizations in the calculation of radiative forcing?
• What are the robust model responses to tightly specified aerosol forcing from preindustrial to present day?

Workshop Format:

The workshop will run from 9:00am on Tuesday 11th June and end at 1:00pm on Friday June 14th. The format will include science presentations (oral and poster) and discussion sessions.

Scientific Organizing Committee:

Bill Collins (U Reading), Stephanie Fiedler (MPI), Piers Forster (U Leeds), Jean-François Lamarque (NCAR), Gunnar Myhre (CICERO), Vaishali Naik (GFDL), David Paynter (GFDL), Robert Pincus (U Colorado), V. Ramaswamy (GFDL), Michael Schulz (Met Norway), and Bjorn Stevens (MPI)

Local Organizing Committee:

David Paynter, Vaishali Naik, and V. Ramaswamy

More information:
AerChemMIP (Aerosols and Chemistry MIP)
RFMIP (Radiative Forcing MIP)
PDRMIP (Precipitation Driver Response MIP)

workshop webpage

Abstract submission and registrations are open for the ICRC-CORDEX 2019 conference that will take place from 14-18 October 2019 in Beijing, China.

The WCRP CORDEX International Conference on Regional Climate (ICRC-CORDEX) series brings together the international regional climate research community. It focuses on high-resolution climate information; applications to vulnerability, impacts and adaptation; as well as the full spectrum of potential end users of regional climate information. After successful ICRC conferences in 2011 (Trieste, Italy), 2013 (Brussels, Belgium) and 2016 (Stockholm, Sweden), the international downscaling community is now invited to Beijing, China, to foster science and application of regional climate downscaling through global partnerships.

The deadline for abstract submissions is April 30, 2019.

Find website

Download flyer

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

Simulating the atmospheric response to the 11-year solar cycle forcing with the UM-UKCA model: the role of detection method and natural variability. By E.M. Bednarz et al. in Atmospheric Chemistry and Physics.

Deriving stratospheric age of air spectra using an idealized set of chemically active trace gases. By M. Hauck et al. in Atmospheric Chemistry and Physics.

Foresight must guide geoengineering research and development. By A. Lenton et al. in Nature Climate Change.

Time of steady climate change. By M. Lickley, B.B. Cael, and S. Solomon in the Geophysical Research Letters.

A new method to study inhomogeneities in climate records: Brownian Motion or Random Deviations? By R. Lindau and V. Venema in the International Journal of Climatology.

Is interactive ozone chemistry important to represent polar cap stratospheric temperature variability in Earth-System Models? By H.E. Rieder et al. in the Environmental Research Letters.

Precursory signals of East Asian winter cold anomalies in stratospheric planetary wave pattern. By L. Song and R. Wu in Climate Dynamics.

New climate models forecast a warming surge. By P. Voosen in Science.

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

Timescale Decomposition of Climate and Correction of Variability Using Synthetic Samples of Stable Distributions. By M. Gomez-Garcia et al. in Water Resources Research.

The global diabatic circulation of the stratosphere as a metric for the Brewer–Dobson circulation. By M. Linz et al. in Atmospheric Chemistry and Physics.

Orographic Primary and Secondary Gravity Waves in the Middle Atmosphere from 16‐year SABER Observations. By X. Liu et al. in the Geophysical Research Letters.

Revised records of atmospheric trace gases CO2, CH4, N2O, and δ13C-CO2 over the last 2000 years from Law Dome, Antarctica. By M. Rubino et al. in Earth System Science Data.

Gravity waves in global high‐resolution simulations with explicit and parameterized convection. By C.C. Stephan et al. in the Journal of Geophysical Research: Atmospheres.

On the fine vertical structure of the low troposphere over the coastal margins of East Antarctica. By É. Vignon, O. Traullé, and A. Berne in Atmospheric Chemistry and Physics.

Interannual variations of the rainy season withdrawal of the monsoon transitional zone in China. By W. Zhao et al. in Climate Dynamics.

New US CLIVAR Variations edition published:

The 2019 spring edition of Variations is themed “Stratosphere-troposphere coupling across timescales,” with guest editor Amy Butler, NOAA Earth System Research Laboratory.

While US CLIVAR has traditionally focused on ocean-atmosphere coupling and its role on climate variability, in this edition of Variations we examine the coupling between the two lowest layers of the atmosphere, the troposphere and the stratosphere.

Articles featured in this edition:

• Connections between the stratosphere and synoptic variability (Attard and Coy)
• Stratospheric pathway of the MJO and ENSO for boreal winter surface climate (Garfinkel)
• Links between autumn snow cover and sea ice extent and Northern Hemisphere wintertime climate variability (Furtado)
• The Quasi-Biennial Oscillation and its influences at the surface (Alexander and Holt)
• Decadal variability and connections to the stratosphere: The role of solar variability (Hood and McCormack)
• The role of the stratosphere in future mid-latitude climate projections (Simpson, Hitchcock, Seager, and Wu)

To learn more about this topic, join us for a webinar on April 11 at 2:00 pm EDT, featuring contributors to this edition.