Mitglied der Helmholtz-Gemeinschaft Unsere Ziele Observations of Cirrus Clouds and Trace Gases in the Extra-Tropical UTLS by CRISTA-NF Martin Riese (1),

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Presentation transcript:

Mitglied der Helmholtz-Gemeinschaft Unsere Ziele Observations of Cirrus Clouds and Trace Gases in the Extra-Tropical UTLS by CRISTA-NF Martin Riese (1), Katja Weigel (1), Reinhold Spang (1), Peter Preusse (1), Lars Hoffmann (1), Friedhelm Olschewski (2), and Fred Stroh (1) (1) Institute for Chemistry and Dynamics of the Geosphere (icg-1:Stratosphere) (2) Bergische Universität Wuppertal, FB Mathematik und Naturwissenschaften UTLS Workshop, NCAR, Boulder, October 21, 2009

CRISTA-NF onboard GEOPHYSICA Limb emission profiles [20 km to ground] Vertical sampling and FOV = 200 m Horizontal sampling = about 12 km SCOUT-O3 in November 2005; SCOUT-AMMA in August 2006

Limb-radiance spectra Cloud Index = radiance MW1 / radiance MW2 Narrow sub-visible cirrus layers frequently encountered Occurence frequency of thin cloud layers (< 1 km) in extra-tropics: ~20 % MW1MW2 CO2 H2O CFC -11 Radiance [W/cm 2 sr cm -1 ] Tangent height [km] Wavenumber [cm -1 ] November 4, 2005; 42 0 N, 16 0 O Spang et al., ASR, 2008

Could observations in sub-tropics Transfer flight from Utapao to Hyderabad Cloud top as well as cloud base detectable Outflow-like layers of very low IWC (~ 0.01 ppmV) Spang et al., ASR, 2008

CRISTA-NF trace gas observations Wavenumber [cm -1 ] Temperature, H2O, Ozone, HNO3, CCl4, PAN (PhD work Katja Weigel) Italy, July 29, 2006 Radiance [W/cm 2 sr cm -1 ]

Italy, July 29, 2006 CRISTA-NF trace gas observations PAN [ppbv]

PAN North South Structure of enhanced PAN values above 12 km altitude in both flight directions (opposite viewing directions) Horizontal extend > 500 km; oriented along LOS

Ozon PAN H 2 O Altitude [km] Corresponding enhancement in other tropospheric trace gases (H2O, CCl4) Time [UTC]

Altitude [km] PAN Ozon Stratospheric trace gases (O3 and HNO3) also show an enhancement This points to a strong influence of mixing Time [UTC]

Effects of mixing clearly show up in correlation plot! (Small FOV and favorable viewing direction) PAN - ozone correlation

Location of mixed area

Mixed area at the extra-tropical side of the STJ !

Time [UTC] Ozone Altitude [km] ECMWF Ozone Observed ozone distribution not well reproduces by ECMWF

Time [UTC] Ozone Altitude [km] ECMWF Ozone CLaMS Ozone The observed structures are well reproduced by CLaMS This is a good basis for on-going analysis

Summary and Outlook High resolution limb emission sounding can provide unique information on cloud and trace gas distribution in the UTLS CRISTA-NF observed an occurence frequency of thin (< 1km) SVC layers of about 20%. Trace gas structures observed over Italy (July 29, 2006) point to a strong influence of mixing. The structures are reasonable reproduced by CLaMS (allowing further diagnoses) Current limb sounders (satellite or aircraft) do not provide high-resolution 3D distribution (3rd dimension is missing).

Limb-imaging and tomographie Source: FZJ-ZAT GLORIA-AB on HALO (JÜLICH and KIT) First test flight envisaged for summer 2010 !

PREMIER 3D limb sounding from space Typhoon PREMIER MIPAS Sampling: 0.5 km x 25 km x 50 km (dynamics mode) 0.5 km x 4 km x 8 km (clouds)