ACOM Seminar: Laura Pan


Title: The Tropical Tropopause Definitions and Water Vapor Transport in the TTL: New Insights from Airborne in situ Measurements over the Tropical Western Pacific

Presenter: Laura Pan, Senior Scientist, ACOM

Abstract: The tropical tropoause region plays an important role in the Earth's climate system. The tempature and transport structure there control the amount of water vapor in the stratosphere, which has a significant contribution to the climate forcing. Correctly, representing the temperture structure in the tropical tropopause region is a significant challenge for the chemistry climate models. Understanding the controlling processes is a critical step for making progress. The ATTREX campaign provides a unique data set for examing our theory and hypothesis on the tropical tropopause and TTL. I will present an analysis of temperature, water vapor and ozone across the tropopause over the tropical Western Pacific (TWP) using the ATTREX 2014 observations. The analysis aims to address two connected questions:

(1) The cold point and the WMO lapse rate criteria, which one provides the "correct" definition for the tropical tropopause?
(2) Vertical versus horizontal transport processes, what are the relative importance for dehydration across the TTL?

These questions have been addressed in the past mostly through theoretical and model approaches. The new insights from the observational study on the these problems will be discussed.

Monday, 25 June 2018, 3:30 PM
Refreshments: 3:15 PM
NCAR Foothills Laboratory Large Auditorium - FL2-1022
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Announcement Timing: 
Monday, June 18, 2018 to Monday, June 25, 2018
Calendar Timing: 
Tuesday, June 26, 2018 - 3:30am to 4:30am

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