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  Quantifying the impact of the North American monsoon and deep midlatitude convection on the subtropical lowermost stratosphere using in situ measurements

Weinstock, E. M., Pittman, J. V., Sayres, D. S., Smith, J. B., Anderson, J. G., Wofsy, S. C., et al. (2007). Quantifying the impact of the North American monsoon and deep midlatitude convection on the subtropical lowermost stratosphere using in situ measurements. Journal of Geophysical Research-Atmospheres, 112(18), D18310. doi:10.1029/2007JD008554.

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 Creators:
Weinstock, E. M., Author
Pittman, J. V., Author
Sayres, D. S., Author
Smith, J. B., Author
Anderson, J. G., Author
Wofsy, S. C., Author
Xueref, I., Author
Gerbig, C.1, Author           
Daube, B. C., Author
Pfister, L., Author
Richard, E. C., Author
Ridley, B. A., Author
Weinheimer, A. J., Author
Jost, H. J., Author
Lopez, J. P., Author
Loewenstein, M., Author
Thompson, T. L., Author
Affiliations:
1Airborne Trace Gas Measurements and Mesoscale Modelling, Dr. habil. C. Gerbig, Department Biogeochemical Systems, Prof. M. Heimann, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497784              

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Free keywords: Water-vapor Atmospheric observations Troposphere exchange Tropical tropopause Tracer measurements Carbon-dioxide Seasonal cycle Transport CO2 Ozone
 Abstract: The chemical composition of the lowermost stratosphere exhibits both spatial and temporal variability depending upon the relative strength of (1) isentropic transport from the tropical tropopause layer (TTL), (2) diabatic descent from the midlatitude and northern midlatitude stratosphere followed by equatorward isentropic transport, and (3) diabatic ascent from the troposphere through convection. In situ measurements made in the lowermost stratosphere over Florida illustrate the additional impact of equatorward flow around the monsoon anticyclone. This flow carries, along with older stratospheric air, the distinct signature of deep midlatitude convection. We use simultaneous in situ measurements of water vapor (H2O), ozone (O-3), total odd nitrogen (NOy), carbon dioxide (CO2), and carbon monoxide (CO) in the framework of a simple box model to quantify the composition of the air sampled in the lowermost stratosphere during the mission on the basis of tracer mixing ratios ascribed to the source regions for these transport pathways. The results show that in the summer, convection has a significant impact on the composition of air in the lowermost stratosphere, being the dominant source of water vapor up to the 380 K isentrope. The implications of these results extend from the potential for heterogeneous ozone loss resulting from the increased frequency and lifetime of cirrus near the local tropopause, to air with increased water vapor that as part of the equatorward flow associated with the North American monsoon can become part of the general circulation. [References: 37]

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 Dates: 2007
 Publication Status: Issued
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 Identifiers: DOI: 10.1029/2007JD008554
Other: BGC1026
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Title: Journal of Geophysical Research-Atmospheres
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Geophysical Union
Pages: - Volume / Issue: 112 (18) Sequence Number: - Start / End Page: D18310 Identifier: ISSN: 0148-0227
CoNE: https://pure.mpg.de/cone/journals/resource/991042728714264_1