Satellite Data and UTLS group meeting

The UTLS group hosts an informal science discussion meeting on Wednesdays (10:30-11:30 am, room FL0 2108). Currently the meeting is held every other week, alternating with ACOM research reports.  Additional meetings are scheduled on the off weeks as needed.

Feb 27

Dina Khordakova (Juelich)

MOSES: Modular observation solutions for earth systems - a facility for the investigation of extreme weather events'


Mar 14

Richard Newton

"Tropospheric temperature inversions in the Indian Monsoon - A climatology from GPS radio occultation measurements from 2001 to 2018

Apr 12Xun Wang (TAMU)"Impact of convectively lofted ice on the seasonal cycle of tropical lower stratospheric water vapor”
Jun 19
 Aurelien Podglajen (Juelich)
"Retrieving the age of air spectrum from tracers" 
Jul 25
Eric Jensen

"Using in situ measurements to evaluate the Lagrangian dry point approach for calculating the stratospheric-entry water vapor concentration”

Aug 14
Xinyue Wang

"Fast transport into the lower stratosphere-upper troposphere over North America during northern summer"

Sept 25
Wandi Yu

Influence of convection on stratospheric water vapor in the North American monsoon

Sept 25 

Dec 4
Paul Konopka
Jan 24Shawn Honomichl

A Transport Pathway for Polluted Air from the Asian Summer Monsoon Anticyclone to the Global UTLS

Jan 31Eric Ray (NOAA)

The unexpected recent changes in the decline of CFC-11: New emissions, stratospheric loss variability or both?

Feb 14

Daniele Visioni (Universita' dell'Aquila, Italy)

Chemical and dynamical side effects of stratospheric sulfate geoengineering: changes in upper tropospheric ice

Feb 28Bill Randel

Mainz UTLS workshop highlights summary

April 11Sasha Madronich

"Volatile chemical products emerging as largest petrochemical source of urban organic emissions” by McDonald et al.

April 27Mingmin Zou (CAS/RADI)

Greenhouse Gas Research Planned in Chinese Earth Observing Satellite GaoFen-5 Program

May 9Joan Alexander (NWRA),Sean Davis (NOAA), and Lars Kalnajs (LASP)

Stratéole-2: Tropical UTLS Measurements from Long Duration Superpressure Balloons

June 6Bill Randel

Discussion of a new paper 

June 20 Martina Kraemer (Juelich)The Asian Monsoon airborne field campaign StratoClim 2017 and observations of ice cloud properties
July 10Joowan Kim (Kongju National University, Korea)The Madden-Julian Oscillation’s influences on Stratospheric Moisture 
July 18 Yutian Wu (Columbia)
What is the transport pathway into the UTLS during northern summer?
July 24 Johnny Luo (CCNY)

On the Use of Chemical Tracers to Diagnose Convective Transport Transit Time Spectrum over the Tropical Western Pacific

Aug 1Daniel Phoenix (OU)

Impacts of Tropopause-Penetrating Convection on the Chemical Composition of the Upper Troposphere and Lower Stratosphere

Aug 7Cameron Homeyer (OU)
A 10-year Ground-based Radar Climatology of Convective Penetration of Stratospheric Intrusions and Associated Large-Scale Transport over the CONUS

Aug 17


Marta Abalos (Universidad Complutense de Madrid, Spain)
Impact of ozone depleting substances on the stratospheric Brewer-Dobson circulation (3:30 pm as ACOM seminar)

Nov 6 (Tuesday) 

Bill Randel And Mijeong Park

Beginning look at the new SAGE III data 

Nov 21


Happy Thanksgiving 

Nov 29


Sabine Robrecht (Juelich, Germany)
Might stratospheric ozone loss occur in mid-latitude summer today or in a future with or without geoengineering?

Dec 4 (Tuesday)

Kimberlee Dube (Univ. of Saskatchewan, Canada)
Stratospheric NO2 measurements from SAGE and OSIRIS
Jan 18Laura PanAsian summer monsoon Chemistry Climate Impact Project (ACCLIP)
Jan 25Peter HitchcockSome dynamical insights on the recent disruption of the QBO from an idealized model
Feb 15Mengchu TaoA Lagrangian model diagnosis of stratospheric contributions to the tropical middle tropospheric air
Mar 2Marta AbalosUsing e90 to study UTLS tracer transport in WACCM
Mar15Steve MassieObservational Evidence of 3D Cloud Effects in Orbiting Carbon Observatory
Measurements of CO2
Apr 12Chengji Liu (CSU) Synoptic formation of double tropopauses 
July 11Chuntao Liu (TAMUCC)
Properties of different types of precipitation systems revealed by the Global Precipitation Mission observations
July 25Laura Pan

Lapse rate vs coldpoint: A tale of two tropical tropopause definitions told by tracers

Aug 4Valeria Donets (U Miani)  Shear line facilitated transport of reactive trace gases from East Asia into the deep tropics
Aug 7

Gretchen Mullendore (UND)


 Defining the tropopause in studies of deep convection
Aug 16Rainer Volkamer (CU)

BrO and Bry profiles over the Western Pacific: Relevance of Inorganic Bromine Sources and a Bry Minimum in the Aged Tropical Tropopause Layer

Aug 18Javier Garcia-Serrano (Barcelona Supercomputing Center)

On the Hemispheric Scale of the Winter North Atlantic Oscillation

Aug 24Olga Tweedy (JHU)

Does ENSO influence summer-time ozone in the tropical lower-stratosphere?

Aug. 30 John Albers (NOAA)

 Trends in the Seasonality of the Brewer-Dobson Circulation Due to Radiative-Dynamical Feedbacks

Sep 19

George Kiladis (NOAA)


Variability of Stratospheric mixed Rossby-gravity, Kelvin, and external Rossby modes and connections with the troposphere
Sep 20 (2:30 pm)Liz Moyer (U Chicago)Early results from the StratoClim campaign over the Asian monsoon
Sep 27Laura Pan Space-Time Variability of UTLS Chemical Distribution in the Asian Summer Monsoon Viewed by Limb and Nadir Satellite Sensors
Oct 11Open

Jan 6Bill RandelVernier, J. -P. .JGR 2015
Jan 20Thomas BirnerCharacteristics of lower stratospheric transport as inferred from age of air spectra

Feb 3

 Eric jensen Processes Controlling the Distribution of Relative Humidity in the Tropical Tropopause Layer
Feb 17Laura PanDiscussion of an Asian monsoon dynamics paper: Liu YM, Hoskins BJ, Blackburn M (2007) Impact of Tibetan orography and heating on the summer flow over Asia. J Meteorol Soc  Jpn (Special 125th Anniversary Issue, Invited Review Articles) 85B:1–19
Feb 25Jasna Pittman (NWRA)Input into the Stratosphere As Revealed by ATTREX Observations of Greenhouse Gases
March 2Jeremiah Sjorberg (NOAA)Stratosphere-troposphere coupling insights from both a Kelvin wave momentum flux dataset and the Sudden Stratospheric Warming Compendium
March 16 Matthias Nuetzel (DLR) Connection of (lower level) monsoon with climate indices - possible pathways to explore the UTLS response on interannual time scales
March 30Aurelien Podglajen (LMD)Lagrangian temperature and vertical velocity fluctuations due to gravity
waves in the lower stratosphere
April 12Qiang Fu (U Washington)Tropical lower-stratospheric H2O & tropical tropopause layer cirrus: A COSMIC perspective
April 27 Laura Pan Prather et al. : An atmospheric chemist in search of the tropopause, JGR 2011:
May 11Chuck Bardeen Initial evaluation of UTLS temperature, water vapor and clouds in CESM6
June 16Cameron Homeyer (OU)Procuring a Toolbox for Studying Tropopause-Penetrating Convection : Methods, Observations, and Models
July 13Bill Randel Relationships between outgoing longwave radiation and diabatic heating in reanalyses
July 20Minghui Diao (SJSU)Comparisons of ice supersaturation and ice microphysical properties between in-situ observations and a hierarchy of models: a cloud-resolving model, WRF and CAM5
Agust 23Johnny Luo (CCNY)  Satellite-Based Estimation of Convective and Large-Scale Mass Fluxes and Implications for Convective Transport of Composition
August 25Lorenzo Polvani (Columbia)The impact of ozone depleting substances on tropical upwelling, as revealed by the absence of lower stratospheric cooling since the late 1990s
Sept. 14Bernd Kaercher (DLR)Homogeneous Ice Formation in Supercooled Water Clouds
Sept. 28Chengjun Yang (STU, China)"The signal of the Madden-Julian Oscillation in Southern middle atmosphere during austral winter"
Oct 12John BergmanThe viability of trajectory analysis for diagnosing dynamical and chemical influences on ozone concentrations in the tropical UTLS: Lessons learned in complex systems analysis
Oct 26Marta AbalosPhase-speed spectra of eddy tracer fluxes linked to isentropic stirring and mixing in the upper troposphere and lower stratosphere
Nov 9Eric JensenAn overview of the POSIDON WB-57 campaing in Guam
July 17Daniel Gilford (MIT)Nonlocal radiative effects of abrupt drops in tropical tropopause layer water vapor and ozone
July 24Aditi Sheshadri (MIT)Variability of the polar stratospheric vortex and its impact on surface climate patterns in an idealized AGCM
Aug 5Claudia Stephan (CU)Gravity Waves Generated by Convection: A New Idealized Model Tool and Direct Validation with Satellite Observations
Sept 2Ken Minschwaner (NM Tech)The hunt for laminae in UTLS ozonesonde measurements:
What can they tell us about transport and dynamics?
Sept 16Mijeong Park  and Bill RandelVariability of reactive nitrogen species linked to the stratospheric QBO
Sept 30Marta AbalosInterannual variability of effective diffusivity in the UTLS
Oct 14Joowan KimLarge-scale temperature and moisture responses to deep convection in the tropical UTLS: observations from COSMIC GPS RO and Aura MLS
Oct 28Thomas Birner (CSU)The discovery of the stratosphere
Nov 5

Rafael Fernandez

Global Distributions of Very Short-Lived Halogens: from the Ocean Surface to the Tropical Tropopause Layer
Nov 17Peter Hitchcock
(U. Cambridge)
A radiative origin for the double-peak structure of upwelling in the tropical lower stratosphere




ACOM | Atmospheric Chemistry Observations & Modeling