Tropopause and hygropause variability over the equatorial Indian Ocean during February and March 1999 (Articolo in rivista)

Type
Label
  • Tropopause and hygropause variability over the equatorial Indian Ocean during February and March 1999 (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1029/2005JD006639 (literal)
Alternative label
  • MacKenzie,AR C. Schiller, Th. Peter, A. Adriani, J. Beuermann, O. Bujok, F. Cairo, T. Corti, G. DiDonfrancesco, I. Gensch, C. Kiemle, M. Kramer, C. Krager, S. Merkulov, A. Oulanovsky, F. Ravegnani, S. Rohs, V. Rudakov, P. Salter, V. Santacesaria, L. (2006)
    Tropopause and hygropause variability over the equatorial Indian Ocean during February and March 1999
    in Journal of geophysical research
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • MacKenzie,AR C. Schiller, Th. Peter, A. Adriani, J. Beuermann, O. Bujok, F. Cairo, T. Corti, G. DiDonfrancesco, I. Gensch, C. Kiemle, M. Kramer, C. Krager, S. Merkulov, A. Oulanovsky, F. Ravegnani, S. Rohs, V. Rudakov, P. Salter, V. Santacesaria, L. (literal)
Pagina inizio
  • D18112 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 111 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • d18 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Univ Lancaster, Dept Environm Sci, Lancaster LA1 4YQ, England Forschungszentrum Julich, Inst Stratospher Res, D-52425 Julich, Germany Swiss Fed Inst Technol, Inst Atmospher & Climate Sci, CH-8092 Zurich, Switzerland CNR, Inst Atmospher Phys, Rome, Italy Ente Nuove Tecnol Energia Ambiente, I-00060 Rome, Italy Deutsch Zentrum Luft & Raumfahrt, IPA, Arbeitsgrp Lidar, D-82234 Oberpfaffenhofen, Wessling, Germany Cent Aerol Observ, Dolgoprudnyi 141700, Moscow Region, Russia CNR, Ist Sci Atmosfera & Clima, I-40129 Bologna, Italy Met Off, Exeter, Devon, England Comitato Gest, Airborne Platform Earth Observat, Florence, Italy (literal)
Titolo
  • Tropopause and hygropause variability over the equatorial Indian Ocean during February and March 1999 (literal)
Abstract
  • 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 < 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. (literal)
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