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Hintsa, E.J., Boering, K.A., Weinstock, E.M., Anderson, J.G., Gary, B.L., Pfister, L., Daube, B.C., Wofsy, S.C., Loewenstein, M., Podolske, J.R., Margitan, J.J. and Bui, T.P. (1998). Troposphere-to-stratosphere transport in the lowermost stratosphere from measurements of H2O, CO2, N2O and O3. Geophysical Research Letters 25: doi: 10.1029/98GL01797. issn: 0094-8276. |
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The origin of air in the lowermost stratosphere is investigated with measurements from the NASA ER-2 aircraft. Air with high water vapor mixing ratios was observed in the stratosphere at &thgr;~330--380 K near 40 N in May 1995, indicating the influence of intrusions of tropospheric air. Assuming that observed tracer-tracer relationships reflect mixing lines between tropospheric and stratospheric air masses, we calculate mixing ratios of H2O (12--24 ppmv) and CO2 for the admixed tropospheric air at &thgr;=352--364 K. Temperatures on the 355 K surface at 20--40 N were low enough to dehydrate air to these values. While most ER-2 CO2 data in both hemispheres are consistent with tropical or subtropical air entering the lowermost stratosphere, measurements from May 1995 for &thgr;<362 K suggest that entry of air from the midlatitude upper troposphere can occur in conjunction with mixing processes near the tropopause. ¿ 1998 American Geophysical Union |
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Keywords
Meteorology and Atmospheric Dynamics, Stratosphere/troposphere interactions, Atmospheric Composition and Structure, Middle atmosphere—constituent transport and chemistry, Meteorology and Atmospheric Dynamics, Middle atmosphere dynamics (0341, 0342), Atmospheric Composition and Structure |
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Publisher
American Geophysical Union
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