long-lived tracers and the origin of air in the tropical tropopause layer during attrex
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Long-Lived Tracers and the Origin of Air in the Tropical Tropopause Layer during ATTREX. Eric Hintsa, Fred Moore, Geoff Dutton, Brad Hall, David Nance, and Jim Elkins - PowerPoint PPT PresentationTRANSCRIPT
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Long-Lived Tracers and the Origin of Air in the Tropical Tropopause
Layer during ATTREXEric Hintsa, Fred Moore, Geoff Dutton, Brad Hall,
David Nance, and Jim ElkinsBruce Daube, Jasna Pittman, Steve Wofsy, Ru-Shan
Gao, Andrew Rollins, Troy Thornberry, Laurel Watts, David Fahey, Tao Wang, Andrew Dessler,
Paul Bui, M. J. Mahoney, Boon Lim, Cameron Homeyer, and the ATTREX Science Team
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Where Do We Come From? What Are We? Where Are We Going? – P. Gauguin, 1897
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Main Points
• The parts of the TTL sampled along Global Hawk flight tracks during ATTREX-2 had young and relatively uniform air.
• Small variations in tracer mixing ratios show that there was some mixing in of extratropical or older air.
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Possible intrusions of extratropical air into the tropical tropopause region
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Ozone
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Variations in methane distribution on November 5
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Potential Temperature – Latitude Cross-section, February 9, 2013
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Feb. 9, 2013, Color-coded by Methane
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Stratospheric air with tropical entry Tropical
pipe
Free Trop.
Boundary layer
Tropopause
START-08 Data – GV flights in NH midlatitudes
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Feb. 9, 2013, Color-coded by Latitude
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Feb. 9, 2013, Color-coded by Latitude
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Feb. 21, 2013; UCATS Methane
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Feb. 21, 2013, Color-coded by N2O
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Feb. 21, 2013, Color-coded by Latitude
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Feb. 21, 2013, Color-coded by Latitude
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March 1, 2013, Color-coded by Methane
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March 1, 2013, Color-coded by N2O
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Summary
• Tracer measurements along Global Hawk flight tracks show young and relatively uniform air in the TTL during ATTREX-2.
• Small variations in tracer mixing ratios indicate mixing in of extratropical air and the influence of interhemispheric gradients.
• Near future: Add in other tracers and PV• Back trajectories from points along flight track
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Altitude vs. latitude, color-coded by methane, Nov. 9
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Ozone vs. Methane, binned by theta, November 9, 2011
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Methane-N2O Correlation Plot
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SF6 vs. N2O, February 14, 2013
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UCATS CO data sorted by Ozone