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Definitions and sharpness of the extratropical tropopause: A trace gas perspecti

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Title:
Definitions and sharpness of the extratropical tropopause: A trace gas perspective Authors:
Pan, L. L.; Randel, W. J.; Gary, B. L.; Mahoney, M. J.; Hintsa, E. J. Affiliation:
AA(National Center for Atmospheric Research, Boulder, Colorado, USA), AB(National Center for Atmospheric Research, Boulder, Colorado, USA), AC(Jet Propulsion Laboratory, Pasadena, California, USA), AD(Jet Propulsion Laboratory, Pasadena, California, USA), AE(Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, USA) Publication:
Journal of Geophysical Research: Atmospheres, Volume 109, Issue D23, CiteID D23103 (JGRD Homepage) Publication Date:
12/2004 Origin:
AGU; WILEY Keywords:
Meteorology and Atmospheric Dynamics: Middle atmosphere dynamics (0341, 0342), Meteorology and Atmospheric Dynamics: Stratosphere/troposphere interactions, Atmospheric Composition and Structure: Middle atmosphere-constituent transport and chemistry (3334), tropopause definitions, stratosphere-tropopause exchange, tracer-tracer correlations Abstract Copyright:
Copyright 2004 by the American Geophysical Union. DOI:
10.1029/2004JD004982 Bibliographic Code:
2004JGRD..10923103P

Abstract

Definitions of the extratropical tropopause are examined from the perspective of chemical composition. Fine-scale measurements of temperature, ozone, carbon monoxide, and water vapor from approximately 70 aircraft flights, with ascending and descending tropopause crossings near 40°N and 65°N, are used in this analysis. Using the relationship of the stratospheric tracer O3 and the tropospheric tracer CO, we address the issues of tropopause sharpness and where the transitions from troposphere to stratosphere occur in terms of the chemical composition. Tracer relationships indicate that mixing of stratospheric and tropospheric air masses occurs in the vicinity of the tropopause to form a transition layer. Statistically, this transition layer is centered on the thermal tropopause. Furthermore, we show that the transition is much sharper near 65°N (a region away from the subtropical jet) but spans a larger altitude range near 40°N (in the vicinity of the subtropical jet). This latter feature is consistent with enhanced stratosphere-troposphere exchange and mixing activity near the tropopause break.
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