All posts by Mareike@WCRP/SPARC

Webinar on “Stratosphere-troposphere coupling across timescales” on April 11, 2:00 pm EDT

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.

SPARC Science update: 2 April – 8 April

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

 

Ground-based ozone profiles over central Europe: incorporating anomalous observations into the analysis of stratospheric ozone trends. By L. Bernet et al. in Atmospheric Chemistry and Physics.

Modelling spatially correlated observation errors in variational data assimilation using a diffusion operator on an unstructured mesh. By O. Guillet et al. in the Quarterly Journal of the Royal Meteorological Society.

Recent Weakening in the Stratospheric Planetary Wave Intensity in Early Winter. By D. Hu, Y. Guo, and Z. Guan in the Geophysical Research Letters.

Evaluating the Brewer–Dobson circulation and its responses to ENSO, QBO, and the solar cycle in different reanalyses. By J. Rao et al. in Earth and Planetary Physics.

The climatology of the Brewer–Dobson circulation and the contribution of gravity waves. By K. Sato and S. Hirano in Atmospheric Chemistry and Physics.

Nonlinear latitudinal transfer of wave activity in the winter stratosphere. By R.K. Scott in the Quarterly Journal of the Royal Meteorological Society.

Modification of potential vorticity near the tropopause by non-conservative processes in the ECMWF model. By E. Spreizer et al. in the Journal of the Atmospheric Sciences.

Double cores of the Ozone Low in the vertical direction over the Asian continent in satellite data sets. By Z. Tang et al. in Earth and Planetary Physics.

Latitudinal and topographical variabilities of free atmospheric turbulence from high‐resolution radiosonde datasets. By J. Zhang et al. in the Journal of Geophysical Research: Atmospheres.

A multi‐location joint field observation of the stratosphere and troposphere over the Tibetan Plateau. By JQ Zhang et al. in Earth and Planetary Physics.

Decadal variations in the winter Beaufort High and the stratospheric polar vortex. By M. Zhang, W. Perrie, and Z. Long in the Geophysical Research Letters.

Registration now open: CCMi Science workshop & training school in Hong Kong

We are pleased to announce that the website for the 2019 CCMI Science Workshop in Hong Kong is now open! In addition, registration for both the workshop and the summer school, and abstract submission is now open.

Find webpage

On the website you can find a link to the IGAC Event Abstract Submission System that is being used as well as further details.

Workshop dates:

CCMi summer school: 4 – 6 August
CCMi science workshop: 7 – 9 August

on the campus of The Chinese University of Hong Kong (CUHK).

Importand deadlines:
Abstract submission and application for the summer school: April 26th
Registration: June 28th

Note that the registration website has an incorrect deadline for abstract submission and summer school application and this will be corrected soon.

The CCMi activity leaders are looking forward to seeing you in Hong Kong in August for tropical humidity, interesting discussions of new science including what we have learned from CCMI-1, and where we would like to go with phase two of CCMI.

SPARC Science update: 26 March – 1 April

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

 

Stratospheric water vapor: an important climate feedback. By A. Banerjee et al. in Climate Dynamics.

Comparison of methods for extracting annual cycle with changing amplitude in climate series. By Q. Deng and Z. Fu in Climate Dynamics.

Atmospheric structures in the troposphere as revealed by high-resolution backscatter images from MU radar operating in range-imaging mode. By L. Kantha et al. in Progress in Earth and Planetary Science.

Prescribing Zonally‐Asymmetric Ozone Climatologies in Climate models: Performance compared to a Chemistry‐Climate Model. By C.D. Rae et al. in the Journal of Advances in Modeling Earth Systems.

Upper tropospheric ozone transport from the sub-tropics to tropics over the Indian region during Asian summer monsoon. By S. Shankar Das, et al. in Climate Dynamics.

Prediction of Northern Hemisphere regional surface temperatures using stratospheric ozone information. By K.A. Stone et al. in the Journal of Geophysical Research: Atmospheres.

The operational global four‐dimensional variational data assimilation system at the China Meteorological Administration. By L. Zhang et al. in the Quarterly Journal of the Royal Meteorological Society.

 

Discussion papers – open for comment:

Transport of the 2017 Canadian wildfire plume to the tropics and global stratosphere via the Asian monsoon circulation. By C. Kloss et al. in Atmospheric Chemistry and Physics.

Inter-model comparison of global hydroxyl radical (OH) distributions and their impact on atmospheric methane over the 2000–2016 period. By Y. Zhao et al. in Atmospheric Chemistry and Physics.

SPARC Science update: 19 March – 25 March

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

 

Second-order retrieval of UTH. By K. Gierens and K. Elefheratos in Atmospheric Chemistry and Physics.

The importance of interactive chemistry for stratosphere–troposphere coupling. By S. Haase and K. Matthes in Atmospheric Chemistry and Physics.

Stratospheric Trailing Gravity Waves from New Zealand. By Q. Jiang et al. in the Journal of the Atmospheres.

Influence of the QBO on MJO prediction skill in the subseasonal-to-seasonal prediction models. By Y. Lim et al. in Climate Dynamics.

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.

Water Vapor, Clouds, and Saturation in the Tropical Tropopause Layer. By M.R. Schoeberl et al. in the Journal of Geophysical Research: Atmospheres.

Madden-Julian Oscillations Seen in the Upper–Tropopshere Vorticity Field: Interactions with Rossby-Wave Trains. By D. Wang, J-I. Yano, and Y. Lin in the Journal of the Atmospheric Sciences.

Characterising the seasonal and geographical variability in tropospheric ozone, stratospheric influence and recent changes. By R.S. Williams et al. in Atmospheric Chemistry and Physics.

 

Discussion papers – open for comment:

On the representation of major stratospheric warmings in reanalyses. By B. Ayarzagüena et al. in Atmospheric Chemistry and Physics.

Stratospheric ozone trends for 1985–2018: sensitivity to recent large variability. By W. Ball et al. in Atmospheric Chemistry and Physics.

The effect of atmospheric nudging on the stratospheric residual circulation in chemistry-climate models. By A. Chrysanthou et al. in Atmospheric Chemistry and Physics.

Increased water vapour lifetime due to global warming. By Ø. Hodnebrog et al. in Atmospheric Chemistry and Physics.

Announcement: HEMERA summer school, Heidelberg/Germany, Sept. 9 – 13, 2019

The HEMERA summer school is open to advanced master students, PhD students and young scientists interested/involved in balloon research, technicians and engineers from the participating agencies and industries. The participation of technicians, engineers and scientists from eastern and southern European countries is particularly welcome.

Major themes of the summer school will cover the following:

  1. The history, early and modern balloon science and industrial opportunities, recent advances and discoveries.
  2. The atmospheric environment
  3. The general logistics of balloon types, flight control, limitations of the ballooning environment, launching techniques, regulations.
  4. Specific scientific and industrial ballooning operations of the agencies (CNES, SSC, ASI/CSA….
  5. More detail on modern scientific results from ballooning and the instruments involved.
  6. Future work, opportunities, measurements, ..

Teaching at the HEMERA summer school will be provided via lectures and showing casing balloon equipment.  One afternoon and the evening of Sept. 11, 2019 will be dedicated to a social programme (see programme).

Registration will open soon.  Please visit the HEMERA summer school webpage for more information.

Participation fee: 100€ (including catering, the summer school diner, and participation in the social program)

Registration deadline: 26 July 2019

Find webpage

Second announcement: Tri-MIP-athlon-2

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

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

 


Download second announcement (PDF, 0.2 MB)

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

Deadlines:

Abstract submission: April 12 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

SPARC Science update: 12 March – 18 March

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

 

Troposphere-Stratosphere Coupling Following Tropospheric Blocking and Extratropical Cyclones. By H.E. Attard and A.L. Lang in the Monthly Weather Review.

InSAR Meteorology: High‐Resolution Geodetic Data Can Increase Atmospheric Predictability. By P.M.A. Miranda et al. in the Geophysical Research Letters.

Impacts of tropical tropopause warming on the stratospheric water vapor. By Y. Xia et al. in Climate Dynamics.

 

Discussion papers – open for comment:

Implicationsof constant CFC-11 concentrationsfor the future ozone layer. By M. Dameris, P. Jöckel, and M. Nützel in Atmospheric Chemistry and Physics.

SPARC Science update: 5 March – 11 March

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

 

On the Interplay Between Convective Aggregation, Surface Temperature Gradients, and Climate Sensitivity. By D. Coppin and S. Bony in the Journal of Advances in Modeling Earth Systems.

Estimating the Frequency of Sudden Stratospheric Warming Events from Surface Observations of the North Atlantic Oscillation. By D.I.V. Domeisen in the Journal of Geophysical Research: Atmospheres.

Unravelling the microphysics of polar mesospheric cloud formation. By D. Duft, M. Nachbar, and T. Leisner in Atmospheric Chemistry and Physics.

Evaluating the relationship between interannual variations in the Antarctic Ozone Hole and Southern Hemisphere surface climate in chemistry-climate models. By Z.E. Gillett et al. in the Journal of the Climate.

On the value of reanalyses prior to 1979 for dynamical studies of stratosphere–troposphere coupling. By P. Hitchcock in Atmospheric Chemistry and Physics.

Eurasian Cold Air Outbreaks under Different Arctic Stratospheric Polar Vortex Strength. By J. Huang and W. Tian in the Journal of Atmospheric Sciences.

Indian summer monsoon onset signatures on the tropical tropopause layer. By S. RavindraBabu et al. in the Atmospheric Science Letters.

The NASA Wallops Flight Facility Digital Ozonesonde Record: Reprocessing, Uncertainties, and Dual Launches. By J.C. Witte et al. in the Journal of Geophysical Research: Atmospheres.

Impacts of tropical tropopause warming on the stratospheric water vapor. By Y. Xia et al. in Climate Dynamics.

Statistical study of atmospheric turbulence by Thorpe analysis. By J. Zhang et al. in the Journal of Geophysical Research: Atmospheres.

 

Discussion papers – open for comment:

Quantification of water vapour transport from the Asian monsoon to the stratosphere. By M. Nützel et al. in Atmospheric Chemistry and Physics.