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Tropopause and hygropause variability over the equatorial Indian Ocean during February and March 1999

McKenzie, Robert und Schiller, Cornelius und Peter, Tomas und Adriani, Alberto und Beuermann, Jürgen und Cairo, Francesco und Corti, Tino und DiDonfrancesco, G. und Gensch, I. und Kiemle, C. und Krämer, M. und Kröger, C. und Merkulov, S. und Oulanovsky, A. und Ravegnani, F. und Rohs, S. und Rudakov, V. und Salter, P. und Santacesaria, V. und Stefanutti, L. und Yushkov, V. (2006) Tropopause and hygropause variability over the equatorial Indian Ocean during February and March 1999. Journal of Geophysical Research, 111, D18112. DOI: 10.1029/2005JD006639.

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Kurzfassung

Measurements of temperature, water vapor, total water, ozone, and cloud properties were made above the western equatorial Indian Ocean in February and March 1999. The cold-point tropopause was at a mean pressure-altitude of 17 km, equivalent to a potential temperature of 380 K, and had a mean temperature of 190 K. Total water mixing ratios at the hygropause varied between 1.4 and 4.1 ppmv. The mean saturation water vapor mixing ratio at the cold point was 3.0 ppmv. This does not accurately represent the mean of the measured total water mixing ratios because the air was unsaturated at the cold point for about 40% of the measurements. As well as unsaturation at the cold point, saturation was observed above the cold point on almost 30% of the profiles. In such profiles the air was saturated with respect to water ice but was free of clouds (i.e., backscatter ratio lower than 2) at potential temperatures more than 5 K above the tropopause and hygropause. Individual profiles show a great deal of variability in the potential temperatures of the cold point and hygropause. We attribute this to short timescale and space-scale perturbations superimposed on the seasonal cycle. There is neither a clear and consistent ‘‘setting’’ of the tropopause and hygropause to the same altitude by dehydration processes nor a clear and consistent separation of tropopause and hygropause by the Brewer-Dobson circulation. Similarly, neither the tropopause nor the hygropause provides a location where conditions consistently approach those implied by a simple ‘‘tropopause freeze drying’’ or ‘‘stratospheric fountain’’ hypothesis.

Dokumentart:Zeitschriftenbeitrag
Titel:Tropopause and hygropause variability over the equatorial Indian Ocean during February and March 1999
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
McKenzie, RobertLancaster Univ., Lancaster, UK
Schiller, CorneliusFZ Jülich, Jülich
Peter, TomasETH Zürich, Zürich, CH
Adriani, AlbertoCNR Roma, Rom, I
Beuermann, JürgenFZ Jülich, Jülich
Cairo, FrancescoCNR Roma, Rom, I
Corti, TinoETH Zürich, Zürich, CH
DiDonfrancesco, G.ENEA, Rom, I
Gensch, I.FZ Jülich, Jülich
Kiemle, C.NICHT SPEZIFIZIERT
Krämer, M.FZ Jülich, Jülich
Kröger, C.Lancaster Univ., Lancaster, UK
Merkulov, S.Central Aerological Observ., Dolgoprudny, R
Oulanovsky, A.Central Aerological Observ., Dolgoprudny, R
Ravegnani, F.CNR, Bologna, I
Rohs, S.FZ Jülich, Jülich
Rudakov, V.Central Aerological Observ., Dolgoprudny, R
Salter, P.Met Office, Exeter, UK
Santacesaria, V.APE, Florence, I
Stefanutti, L.APE, Florence, I
Yushkov, V.Central Aerological Observ., Dolgoprudny, R
Datum:2006
Erschienen in:Journal of Geophysical Research
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:111
DOI :10.1029/2005JD006639
Seitenbereich:D18112
Status:veröffentlicht
Stichwörter:tropical tropopause, airborne lidar, hygropause
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben LIDAR-Forschung und -Entwicklung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Lidar
Hinterlegt von: Dr.rer.nat. Christoph Kiemle
Hinterlegt am:29 Nov 2006
Letzte Änderung:11 Nov 2014 21:56

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