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

The CMIP6 landscape. Editorial in Nature: Climate Change.

Application of the compressible, nonhydrostatic, balanced omega equation in estimating diabatic forcing for parameterization of inertia–gravity waves: Case study of moist baroclinic waves using WRF. By M. Haghighatnasab et al. in the Journal of Atmospheric Sciences.

Stratospheric Influences on the MJO-Induced Rossby Wave Train: Effects on Intraseasonal Climate. By L.L. Hood et al. in the Journal of the Climate.

Convective hydration in the tropical tropopause layer during the StratoClim aircraft campaign: pathway of an observed hydration patch. By K.-O. Lee et al. in Atmospheric Chemistry and Physics.

Core Concept: To improve weather and climate models, researchers are chasing atmospheric gravity waves. By A. Mann in the Proceedings of the National Academy of Sciences of the Unted States of America (PNAS)

Discussion papers – open for comments:

A Comprehensive Assessment of Tropical Stratospheric Upwelling in Specified Dynamics CESM1.2.2 (WACCM). By N.A. Davis et al. in Geoscientific Model Development.

Bromine from short–lived source gases in the Northern Hemisphere UTLS. By T. Keber et al. in Atmospheric Chemistry and Physics.

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.

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

Modulation of the MJO‐Related Teleconnections by the QBO. By P.-N. Feng and H. Lin in the Journal of Geophysical Research: Atmosphers.

ENSO modulation of the QBO: Results from MIROC models with and without non-orographic gravity wave parameterization. By Y. Kawatani et al. in the Journal of Atmospheric Sciences.

The Horizontal Spectrum of Vertical Velocities near the Tropopause from Global to Gravity-Wave Scales. By U. Schumann in the Journal of Atmospheric Sciences.

Discussion papers – open for comments

Inconsistencies between chemistry climate model and observed lower stratospheric trends since 1998. By W.T. Ball et al. in Atmospheric Chemisty and Physics.

An observation-based climatology of middle atmospheric meridional circulation. By T. von Clarmann et al. in Atmospheric Chemistry and Physics.

A reassessment of the discrepancies in the annual variation of δD-H2O in the tropical lower stratosphere between the MIPAS and ACE-FTS satellite data sets. By S. Lossow et al. in Atmospheric Measurement Techniques.

ESMValTool v2.0 – Technical overview. By M. Righi et al. in Geoscientific Model Development.

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

Advancing Research for Seamless Earth System Prediction. By P. Ruti et al. in the Bulletin of the American Meteorological Society.

Techniques and challenges in the assimilation of atmospheric water observations for numerical weather prediction towards convective scales. By R.N. Bannister, H. Chiplski, and O. Martinez-Alvarado in the Quarterly Journal of the Royal Meteorological Society.

An expanded definition of the odd oxygen family for tropospheric ozone budgets: Implications for ozone lifetime and stratospheric influence. By K.H. Bates and D.J. Jacob in the Geophysical Research Letters.

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

Physical mechanisms controlling the offshore propagation of convection in the tropics. Part I: Flat island. By D. Coppin and G. Bellon in the Journal of Advances in Modeling Earth Systems.

Physical mechanisms controlling the offshore propagation of convection in the tropics. Part II: Influence of topography. By D. Coppin and G. Bellon in the Journal of Advances in Modeling Earth Systems.

Assimilation of satellite data in numerical weather prediction. Part I: the early years. By J.R. Eyre, S.J. English, and M. Forsythe in the Quarterly Journal of the Royal Meteorological Society.

Evaluating the Joint Influence of the Madden‐Julian Oscillation and the Stratospheric Polar Vortex on Weather Patterns in the Northern Hemisphere. By M.R. green and J.C. Furtado in the Journal of Geophysical Research: Atmospheres.

A stochastic representation of temperature fluctuations induced by mesoscale gravity waves. By B. Kärcher and A. Podglajen in the Journal of Geophysical Research: Atmospheres.

Changes in mean flow and atmospheric wave activity in the North Atlantic sector. By H. Paeth and F. Pollinger in the Quarterly Journal of the Royal Meteorological Society.

Monsoon Mission: A targeted activity to improve monsoon prediction across scales. By S.A. Rao et al. in the Bulletin of the American Meteorological Society.

Discussion papers – open for comment:

Response of middle atmospheric temperature to the solar 27-day cycle: an analysis of 13 years of MLS data. By P. Rong et al. in Atmospheric Chemistry and Physics.

The call for nominations to SPARC’s Scientific Steering Group (SSG) is now open. The SSG currently comprises 12-14 researchers from around the world with a wide range of expertise in atmospheric dynamics and chemistry. They guide SPARC’s priorities and activities, working together with the SSG co-chairs and the SPARC project office. SSG members will be responsible for the new SPARC implementation plan, the regional and international research agendas, and ensuring that SPARC’s priorities align with those of the new WCRP strategy. We are currently working on a draft of terms of reference that summarise the work of the SSG.

The deadline for nominations is 08 November 2019.

Nominations can be submitted through the online form at
https://www.aparc-climate.org/about/leadership/ssg-nominations/
(including the upload of a publications list).

Please note that you can either nominate a candidate or nominate yourself.

The SSG takes a strategic view of SPARC’s role, so we are looking for individuals with a broad view of atmospheric science and climate change as well as expertise in their own field. Scientific expertise, career stage as well as gender and geographical balance are taken into account. The initial term of service is for four years (January 2021 – December 2024), with a possible extension of two years.

If you are interested in getting involved in SPARC in other ways, including ideas for new foci, please visit the SPARC webpage for more information: www.sparc-climate.org/get-involved or contact the SPARC Office (see below). We recommend that early career researchers consider getting involved in specific activities first, including leadership roles, as involvement in international activities is a great way to broaden one’s horizons. Activity Leaders can attend the annual SSG meetings. We are happy to advise anyone unsure about how best to get involved.

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

Influence of instrumentation on long temperature time series. By F. Acquaotta et al. in Climatic Change.

How accurate are modern climate reanalyses for the data-sparse Tibetan Plateau region? By X. Bao and F. Zhang in the Journal of the Climate.

Gap filling of monthly temperature data and its effect on climatic variability and trends. By S. Beguería, M. Tomas-Burguera, and R. Serrano-Notivoli in the Journal of the Climate.

Improved tropospheric and stratospheric sulfur cycle in the aerosol–chemistry–climate model SOCOL-AERv2. By A. Feinberg et al. in Geoscientific Model Development.

How marine emissions of bromoform impact the remote atmosphere. Ba Y. Jia et al. in Atmospheric Chemistry and Physics.

Building an Accessible, Integrated Earth Observing and Information System: The International Satellite Cloud Climatology Project as a Pathfinder. By W.B. Rossow and J.J. Bates in the Bulletin of the American Meteorological Society.

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

Discussion papers – open for comments:

Detecting breakpoints in global temperature. By J. Duan et al. in Earth System Dynamics.

On the forcings of the unusual QBO structure in February 2016. By H. Li, R. Pilch Kedzierski and K. Matthes 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).

Six New Satellites Watch the Atmosphere over Earth’s Equator. News report by by R. Anthes and W. Schreiner in Earth & Space Science News (EOS).

Atmospheric observations made at Oliktok Point, Alaska, as part of the Profiling at Oliktok Point to Enhance YOPP Experiments (POPEYE) campaign. By G. de Boer et al. in Earth System Science Data.

On the Cooling-to-Space Approximation. By N. Jeevanjee and S. Fueglistaler in the Journal of the Atmospheric Sciences.

POLSTRACC: Airborne experiment for studying the Polar Stratosphere in a Changing Climate with the high-altitude long-range research aircraft HALO. By H. Oelhaf et al. in the Bulletin of the American Meteorological Society.

A Systematic Approach to Assessing the Sources and Global Impacts of Errors in Climate Models. By S.D. Schubert et al. in the Journal of the Climate.

Changes in winter stationary wave activity during weak mid‐latitude and Arctic thermal contrast period. S. Wang et al. in the International Journal of Climatology.

Large Amplitude Quasi‐10‐day Waves in the Middle Atmosphere during Final Warmings. By Y. Yamazaki and V. Matthias in the Journal of Geophysical Research: Atmospheres.

Discussion papers – open for comments:

Modeling Trans-Pacific Transport and Stratospheric Intrusion of Tropospheric Ozone using Hemispheric CMAQ during April 2010: Part 2. Examination of Emission Impacts based on the Higher-order Decoupled Direct Method. By S. Itahashi et al. in Atmospheric Chemistry and Physics.

EGU 2020 call for scientific sessions, Union Symposia, Great Debates, Short courses, and Townhall meetings tot he EGU General assembly 3-8 May 2020 in Vienna, Austria

Deadline: 5 September 2019

More information and link to submission page: https://meetingorganizer.copernicus.org/EGU2020/provisionalprogramme

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

Predictability of Northern Hemisphere final stratospheric warmings and their surface impacts. By A. Butler et al. in the Geophysical Research Letters.

Observational Evidence for Two Modes of Coupling Between Sea Surface Temperatures, Tropospheric Temperature Profile, and Shortwave Cloud Radiative Effect in the Tropics. By S. Fueglistaler in the Geophysical Research Letters.

Impact of vertical wind shear on gravity wave propagation in the land-sea breeze circulation at the equator. By Y. Du, R. Rotunno, and F. Zhang in the Journal of the Atmospheric Sciences.

Modelled and observed volcanic aerosol control on stratospheric NO_y and Cl_y. By B. Zambri et al. in the Journal of Geophysical Research: Atmospheres.

Discussion papers – open for comments:

The Global Methane Budget 2000–2017. By M. Saunois et al. in Earth System Science Data.

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

Tropospheric and stratospheric causal pathways between the MJO and NAO. By E.A. Barnes et al. in the Journal of Geophysical Research: Atmospheres.

The response of the ozone layer to quadrupled CO2 concentrations: implications for climate. By G. Chiodo and L.M. Polvani in the Journal of the Climate.

Uncertainty in the Representation of Orography in Weather and Climate Models and Implications for Parameterized Drag. By A.D. Elvidge et al. in the Journal of Advances in Modeling Earth Systems.

A diagnostic equation for tendency of lapse-rate-tropopause heights and its application. By M. Kohma and K. Sato in the Journal of the Atmospheric Sciences.

Revisiting the Agung 1963 volcanic forcing – impact of one or two eruptions. By U. Niemeier, C. Timmreck, and K. Krueger in Atmospheric Chemistry and Physics.

Large Uncertainties in Estimation of Tropical Tropopause Temperature Variabilities due to Model Vertical Resolution. By W. Wang et al. in the Geophysicl Research Letters.

Parameterization of Directional Absorption of Orographic Gravity Waves and Its Impact on the Atmospheric General Circulation Simulated by the Weather Research and Forecasting Model. By X. Xu et al. in the Journal of the Atmospheric Sciences.

Discussion papers – open for comment:

Very high stratospheric influence observed in the free troposphere over the Northern Alps – just a local phenomenon? By T. Trickl et al. in Atmospheric Chemistry and Physics.

A CEOS, WMO-GSICS Workshop

Hosted by UKSA at the National Physical Laboratory in Teddington 
September 9-11 2019.

This international workshop will discuss the needs, state of the art and vision for a space based climate observing system spanning the electromagnetic spectrum with a workshop report to establish a roadmap for its implementation. In particular it will highlight climate benchmark missions such as UK led TRUTHS mission adopted into the ESA Earth Watch mission for subscription as part of ‘Space19+’ in November, NASA CLARREO and similar mission from China.

More information relating to this workshop including the draft agenda and details of how to register can be found here.