A U.S. - Japan Bilateral Workshop on the Tropical Tropopause Layer: State of the Current Science and Future Observational Needs

15 - 19 October 2012


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Poster Session Info

Additional information about this workshop can be obtained from the members of the workshop organizing committee.

The poster session will be held on Tuesday, 16 October at 17:30 in the East West Center.

Posters should be no more than 46 inches (116 cm) wide and no more than 63 inches (161 cm) tall.

Poster presentations:

1. Constraining Middle Atmospheric Moisture in GEOS-5 Using EOS-MLS Observations
Jianjun Jin, NASA GSFC

2. Dehydration in the TTL estimated from the water vapor match
Yoichi Inai, Tohoku University

3. Trends in the Stratospheric QBO
Kevin Hamilton, University of Hawaii

4. Impact of abrupt stratospheric dynamical change on TTL
Nawo Eguchi, Kyushu University

5. Water Vapor and Cloud Formation in the TTL: Simulation Results vs. Satellite Observations
Tao Wang, Texas A&M University

6. On the turbulent mixing and ozone variations around the tropical tropopause associated with Kelvin waves
Kazunari Koishi, Kyoto University
The observed variations of ozone around the tropical tropopause layer in relation to large-scale waves both in the altitude and isentropic coordinates were examined by analyzing ozonesondes provided by SHADOZ (Southern Hemisphere Additional Ozonesondes). Because ozone near this level can be used for the tracer of atmospheric motion, we regarded an ozone enhancement as the signal of a turbulent mixing. Focusing on the vertical fine structure of ozone and temperature, this study presents observed variations of 10 stations near the equator. Based on the signals of Kelvin waves (an eastward-traveling component of equatorial waves) which is filtered in the spectral-frequency domain using reanalysis data (ERA-Interim), we clarified the dependency of the observed profiles to phase evolution of the large-scale wave. The details of relationships between ozone variations and waves will be presented in this poster.

7. The Dehydration process in the Tropical Tropopause Layer
Moe Yamaki, Hokkaido University
No abstract submitted.

8. Cirrus and water vapor transport in the tropical tropopause layer: A modeling study
Tra Dinh, Princeton University
No abstract submitted.

9. Development of a balloon-born Peltier-based chilled-mirror hygrometer for the troposphere and the lower stratosphere
Takuji Sugidachi, Hokkaido University
No abstract submitted.

10. The role of TTL water vapor and ozone in the anvil detrainment of tropical deep convection – a modeling study.
Bryce Harrop, University of Washington
No abstract submitted.

11. Correlated variability of upwelling and tracers near the tropical tropopause
Marta Abalos, Universidad Complutense de Madrid
No abstract submitted.

12. Intraseasonal to interannual variations of the temperature structure around the tropical tropopause and their relationships with convective activities
Eriko Nishimoto, Kyoto University
No abstract submitted.

13. Comparison between microphysical model simulation and observed cirrus clouds formation within a volcanic aerosol layer in the Tropical Tropopause Layer
Mayuko Sakurai, Nagoya University

14. The occurrence of thin cirrus clouds with 5-day waves over the tropical Indian Ocean during CINDY2011/DYNAMO
Junko Suzuki, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
Cirrus variability in association with 5-day waves is investigated using the shipboard a multi-wavelength high spectral resolution lidar system (2α+3β+2δ), Vaisala RS92 radiosondes at 3-hourly intervals, and 15 balloon-borne cryogenic Frostpoint hygrometers (CFH) in the tropical Indian Ocean (8.0°S, 80.5°E) during the Cooperative Indian Ocean experiment on intraseasonal variability in the year 2011 (CINDY2011; the project name in the United States is Dynamics of the Madden-Julian Oscillation, DYNAMO) field campaign. Around the cold-point tropopause (CPT), 5-day waves with the vertical wavelength of ~5 km and the temperature amplitude of ~3 K were dominant during early November. Thin cirrus clouds appearance (disappearance) corresponded with the cold (warm) anomalies of the waves. Supersaturation (relative humidity with respect to ice; RHi > 100 %) layers also co-existed with cold anomalies. Backward trajectories near the CPT showed the air parcels almost stayed over the vessel during this period. It is expected that the 5-day wave is important for a cirrus generation.



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