An aircraft-based upper troposphere lower stratosphere O3, CO, and H2O climatology for the Northern Hemisphere

S. Tilmes, L. L. Pan, P. Hoor, Elliot L Atlas, M. A. Avery, T. Campos, L. E. Christensen, G. S. Diskin, R. S. Gao, R. L. Herman, E. J. Hintsa, M. Loewenstein, J. Lopez, M. E. Paige, J. V. Pittman, J. R. Podolske, M. R. Proffitt, G. W. Sachse, C. Schiller, H. Schlager & 5 others J. Smith, N. Spelten, C. Webster, A. Weinheimer, M. A. Zondlo

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

We present a climatology of O3, CO, and H2O for the upper troposphere and lower stratosphere (UTLS), based on a large collection of high-resolution research aircraft data taken between 1995 and 2008. To group aircraft observations with sparse horizontal coverage, the UTLS is divided into three regimes: the tropics, subtropics, and the polar region. These regimes are defined using a set of simple criteria based on tropopause height and multiple tropopause conditions. Tropopause-referenced tracer profiles and tracer-tracer correlations show distinct characteristics for each regime, which reflect the underlying transport processes. The UTLS climatology derived here shows many features of earlier climatologies. In addition, mixed air masses in the subtropics, identified by O3-CO correlations, show two characteristic modes in the tracer-tracer space that are a result of mixed air masses in layers above and below the tropopause (TP). A thin layer of mixed air (1-2 km around the tropopause) is identified for all regions and seasons, where tracer gradients across the TP are largest. The most pronounced influence of mixing between the tropical transition layer and the subtropics was found in spring and summer in the region above 380 K potential temperature. The vertical extent of mixed air masses between UT and LS reaches up to 5 km above the TP. The tracer correlations and distributions in the UTLS derived here can serve as a reference for model and satellite data evaluation.

Original languageEnglish (US)
Article numberD14303
JournalJournal of Geophysical Research C: Oceans
Volume115
Issue number14
DOIs
StatePublished - 2010

Fingerprint

Climatology
tropopause
Upper atmosphere
Troposphere
climatology
Northern Hemisphere
Carbon Monoxide
stratosphere
troposphere
aircraft
tracers
tracer
Aircraft
Air
air masses
air mass
Research aircraft
Tropics
observation aircraft
research aircraft

ASJC Scopus subject areas

  • Atmospheric Science
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

An aircraft-based upper troposphere lower stratosphere O3, CO, and H2O climatology for the Northern Hemisphere. / Tilmes, S.; Pan, L. L.; Hoor, P.; Atlas, Elliot L; Avery, M. A.; Campos, T.; Christensen, L. E.; Diskin, G. S.; Gao, R. S.; Herman, R. L.; Hintsa, E. J.; Loewenstein, M.; Lopez, J.; Paige, M. E.; Pittman, J. V.; Podolske, J. R.; Proffitt, M. R.; Sachse, G. W.; Schiller, C.; Schlager, H.; Smith, J.; Spelten, N.; Webster, C.; Weinheimer, A.; Zondlo, M. A.

In: Journal of Geophysical Research C: Oceans, Vol. 115, No. 14, D14303, 2010.

Research output: Contribution to journalArticle

Tilmes, S, Pan, LL, Hoor, P, Atlas, EL, Avery, MA, Campos, T, Christensen, LE, Diskin, GS, Gao, RS, Herman, RL, Hintsa, EJ, Loewenstein, M, Lopez, J, Paige, ME, Pittman, JV, Podolske, JR, Proffitt, MR, Sachse, GW, Schiller, C, Schlager, H, Smith, J, Spelten, N, Webster, C, Weinheimer, A & Zondlo, MA 2010, 'An aircraft-based upper troposphere lower stratosphere O3, CO, and H2O climatology for the Northern Hemisphere', Journal of Geophysical Research C: Oceans, vol. 115, no. 14, D14303. https://doi.org/10.1029/2009JD012731
Tilmes, S. ; Pan, L. L. ; Hoor, P. ; Atlas, Elliot L ; Avery, M. A. ; Campos, T. ; Christensen, L. E. ; Diskin, G. S. ; Gao, R. S. ; Herman, R. L. ; Hintsa, E. J. ; Loewenstein, M. ; Lopez, J. ; Paige, M. E. ; Pittman, J. V. ; Podolske, J. R. ; Proffitt, M. R. ; Sachse, G. W. ; Schiller, C. ; Schlager, H. ; Smith, J. ; Spelten, N. ; Webster, C. ; Weinheimer, A. ; Zondlo, M. A. / An aircraft-based upper troposphere lower stratosphere O3, CO, and H2O climatology for the Northern Hemisphere. In: Journal of Geophysical Research C: Oceans. 2010 ; Vol. 115, No. 14.
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AU - Tilmes, S.

AU - Pan, L. L.

AU - Hoor, P.

AU - Atlas, Elliot L

AU - Avery, M. A.

AU - Campos, T.

AU - Christensen, L. E.

AU - Diskin, G. S.

AU - Gao, R. S.

AU - Herman, R. L.

AU - Hintsa, E. J.

AU - Loewenstein, M.

AU - Lopez, J.

AU - Paige, M. E.

AU - Pittman, J. V.

AU - Podolske, J. R.

AU - Proffitt, M. R.

AU - Sachse, G. W.

AU - Schiller, C.

AU - Schlager, H.

AU - Smith, J.

AU - Spelten, N.

AU - Webster, C.

AU - Weinheimer, A.

AU - Zondlo, M. A.

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N2 - We present a climatology of O3, CO, and H2O for the upper troposphere and lower stratosphere (UTLS), based on a large collection of high-resolution research aircraft data taken between 1995 and 2008. To group aircraft observations with sparse horizontal coverage, the UTLS is divided into three regimes: the tropics, subtropics, and the polar region. These regimes are defined using a set of simple criteria based on tropopause height and multiple tropopause conditions. Tropopause-referenced tracer profiles and tracer-tracer correlations show distinct characteristics for each regime, which reflect the underlying transport processes. The UTLS climatology derived here shows many features of earlier climatologies. In addition, mixed air masses in the subtropics, identified by O3-CO correlations, show two characteristic modes in the tracer-tracer space that are a result of mixed air masses in layers above and below the tropopause (TP). A thin layer of mixed air (1-2 km around the tropopause) is identified for all regions and seasons, where tracer gradients across the TP are largest. The most pronounced influence of mixing between the tropical transition layer and the subtropics was found in spring and summer in the region above 380 K potential temperature. The vertical extent of mixed air masses between UT and LS reaches up to 5 km above the TP. The tracer correlations and distributions in the UTLS derived here can serve as a reference for model and satellite data evaluation.

AB - We present a climatology of O3, CO, and H2O for the upper troposphere and lower stratosphere (UTLS), based on a large collection of high-resolution research aircraft data taken between 1995 and 2008. To group aircraft observations with sparse horizontal coverage, the UTLS is divided into three regimes: the tropics, subtropics, and the polar region. These regimes are defined using a set of simple criteria based on tropopause height and multiple tropopause conditions. Tropopause-referenced tracer profiles and tracer-tracer correlations show distinct characteristics for each regime, which reflect the underlying transport processes. The UTLS climatology derived here shows many features of earlier climatologies. In addition, mixed air masses in the subtropics, identified by O3-CO correlations, show two characteristic modes in the tracer-tracer space that are a result of mixed air masses in layers above and below the tropopause (TP). A thin layer of mixed air (1-2 km around the tropopause) is identified for all regions and seasons, where tracer gradients across the TP are largest. The most pronounced influence of mixing between the tropical transition layer and the subtropics was found in spring and summer in the region above 380 K potential temperature. The vertical extent of mixed air masses between UT and LS reaches up to 5 km above the TP. The tracer correlations and distributions in the UTLS derived here can serve as a reference for model and satellite data evaluation.

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