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| Titel |
Jet characterization in the upper troposphere/lower stratosphere (UTLS): applications to climatology and transport studies |
| VerfasserIn |
G. L. Manney, M. I. Hegglin, W. H. Daffer, M. L. Santee, E. A. Ray, S. Pawson, M. J. Schwartz, C. D. Boone, L. Froidevaux, N. J. Livesey, W. G. Read, K. A. Walker |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 12 ; Nr. 11, no. 12 (2011-06-29), S.6115-6137 |
| Datensatznummer |
250009876
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| Publikation (Nr.) |
 copernicus.org/acp-11-6115-2011.pdf |
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| Zusammenfassung |
| A method of classifying the upper tropospheric/lower stratospheric (UTLS)
jets has been developed that allows satellite and aircraft trace gas data and
meteorological fields to be efficiently mapped in a jet coordinate view. A
detailed characterization of multiple tropopauses accompanies the jet
characterization. Jet climatologies show the well-known high altitude
subtropical and lower altitude polar jets in the upper troposphere, as well
as a pattern of concentric polar and subtropical jets in the Southern
Hemisphere, and shifts of the primary jet to high latitudes associated with
blocking ridges in Northern Hemisphere winter. The jet-coordinate view
segregates air masses differently than the commonly-used equivalent latitude
(EqL) coordinate throughout the lowermost stratosphere and in the upper
troposphere. Mapping O3 data from the Aura Microwave Limb Sounder (MLS)
satellite and the Winter Storms aircraft datasets in jet coordinates
thus emphasizes different aspects of the circulation compared to an EqL-coordinate framework:
the jet coordinate reorders the data geometrically, thus highlighting
the strong PV, tropopause height and trace gas gradients across the subtropical
jet, whereas EqL is a dynamical coordinate that may blur these spatial
relationships but provides information on irreversible transport. The
jet coordinate view identifies the concentration of stratospheric ozone well below
the tropopause in the region poleward of and below the jet core, as well
as other transport features associated with the upper tropospheric
jets. Using the jet information in EqL coordinates allows us to study
trace gas distributions in regions of weak versus strong jets, and
demonstrates weaker transport barriers in regions with less jet influence.
MLS and Atmospheric Chemistry Experiment-Fourier Transform Spectrometer trace gas
fields for spring 2008 in jet coordinates show very strong, closely
correlated, PV, tropopause height and trace gas gradients across the jet, and
evidence of intrusions of stratospheric air below the tropopause below and
poleward of the subtropical jet; these features are consistent between
instruments and among multiple trace gases. Our characterization of the jets
is facilitating studies that will improve our understanding of upper
tropospheric trace gas evolution. |
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