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Transport processes in the stratospher e, diagnosed from ENVISAT-MIPAS observations

Transport processes in the stratospher e, diagnosed from ENVISAT-MIPAS observations. Y. J. ORSOLINI Norwegian Institute for Air Research – NILU orsolini@nilu.no C . RANDALL LASP, University of Colorado, Boulder, USA G. MANNEY

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Transport processes in the stratospher e, diagnosed from ENVISAT-MIPAS observations

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  1. Transport processes in the stratosphere, diagnosed fromENVISAT-MIPAS observations Y. J. ORSOLINI Norwegian Institute for Air Research – NILU orsolini@nilu.no C. RANDALL LASP, University of Colorado, Boulder, USA G. MANNEY NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USA D. ALLEN   US Naval Research Laboratory, USA

  2. MOTIVATION : USE of ENVISAT/MIPAS OBSERVATIONS • Operational Retrievals from ESA : NEAR REAL-TIME data • Illustrate the use of ENVISAT/MIPAS observations of ozone and water vapour • Diagnostic studies of transport processes in the stratosphere • TWO PERIODS ARE EXAMINED • Austral spring 2002 : final warming following the famous vortex split event • (Boreal summer 2003)

  3. Stratospheric Vortex in the Austral Spring 2002 :The split event • Unusual evolution occurred in the winter and spring 2002 • Previously unobserved Stratospheric Sudden Warming in late SEP • Vortex Splitting in two lobes, with strong impact on Antarctic ozone hole • Small vortex recovered a pole-centered position in mid-OCT, after one lobe was absorbed in mid-latitudes The break-down • Final break-down in early NOV, earlier than climatology (e.g. at 10 mb) • Vortex interactions involving a large near-stationary anticyclone, located south of Australia

  4. ECMWF operational analyses of potential vorticity, winds at very-high resolution T511 (0.1 degree) • UKMO analyses • Vortex breakup in early NOV • Tongues of polar air (coiling around the anticyclone, south of Australia) • Tongues of subtropical air (coiling around the vortex) • Filaments /coherent vortices METEOROLOGICAL DATA Potential vorticity and winds (ECMWF analyses)

  5. FIG 1 : Wind reversal in the stratosphere in Spring 2002. The zonal-mean zonal wind at 60S are shown as monthly means for SEP to NOV. Note the rapid decceleration by OCT and the descent of easterlies through 30 mb in NOV.

  6. ECMWF PV in NOV 2002 (850K, near 10mb) SubtropicalTongue ”S” Vortex Tongue ”V” Anticyclone

  7. Mapping of MIPAS Ozone, Water Vapour Operational Retrievals from ESA : NEAR REAL-TIME data • METHODOLOGY • OZONE, WATERVAPOUR and TEMPERATURE (Level-2 ”Meteo-Products”) • 1 month (beginning OCT 24) • Vertical resolution ~4km • Interpolation on isentropes (e.g. 650K, or 850K) • Binning in lat / lon [10 x 30 deg], and time [3 days] (Missing Data !) • note : Vortex air is identified as relatively moist, ozone-poor air (at 850K, or 10 mb) • MAPPING • Mapping of MIPAS observations solely. • Comparison with reverse-trajectory calculations (”RDF”-like method) • Comparison with other satellite data : inferences from solar occultation data (HALOE, SAGE, POAM)

  8. Maps of MIPAS H2O (850K, near 10 mb)

  9. High-resolution Maps of H2O (850K, near 10 mb) reconstruction using a domain-filling trajectory method

  10. Maps of MIPAS O3 (850K, near 10 mb)

  11. Vortex break-down is a TOP-DOWN process • Evidence for a longer-lived vortex at lower levels (e.g. 475K) : in PV, MIPAS O3 and H2O 850K : PV, O3, H2O 475K : PV and O3 Lower stratospheric vortex OCT 24-30 OCT 24-30 NOV 7-13 OCT 24-30 NOV 14-20

  12. MIPAS H2O cross sections (southern hemisphere) HE I GHT THETA EQUIVALENT LATITUDE

  13. MIPAS H2O cross sections (southern hemisphere) HE I GHT THETA

  14. “Sparse” satellite observations from solar occultation instruments • reconstruct O3/H2O maps using an isentropic relation between “PV” and tracer [Randall et al.,2002] • UKMO PV • Use several instruments together (well calibrated with respect to one another) • For O3 : latitude-dependent fits, but not for H2O Proxy O3/H2O reconstruction using solar occultation measurements EQUIVALENT LATITUDE

  15. ECMWF PV on NOV 16, 2002 (475K)

  16. Proxy HALOE-POAM H2O (850K, near 10 mb)

  17. Conclusions • GEOPHYSICAL VALIDATION OF MIPAS • 1 Month of MIPAS mapped observations of O3/H2O : SH vortex breakup in spring 2002 • Continuity between maps / Consistency between O3 and H2O : high-quality of MIPAS obs • Position of the vortex major remnants, vortex erosion : • MIPAS / analyses of PV / inference from solar occulation data • EVENTS IN SH STRATOSPHERE DURING SPRING 2002 • Vortex breakup in early days of NOV at 10 mb (early!). • Longer-lived vortex in lower stratosphere • Synoptic evolution and vortex interactions during the break-down Article in Special Issue of J. of Atmospheric Sciences on Antarctic winter and sudden warming in 2002. Orsolini, Y. J., C.E. Randall, G.L. Manney and D.R. Allen, An observational study of the final breakdown of the southern hemisphere stratospheric vortex in 2002, J. of the Atmospheric Sciences, Revised, Feb., 2004

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