GLORIA- an airborne imaging FTS

Transcription

1 Mahesh Kumar Sha for the GLORIA team, IMK-ASF, KIT, Karlsruhe, Germany KIT University of the State of Baden-Wuerttemberg and National Research Center of the Helmholtz Association

2 GLORIA Team N. Bayer 5, J. Blank 2, R. Dapp 4, A. Ebersoldt 4, H. Fischer 1, F. Friedl-Vallon 1, T. Guggenmoser 2, T. Gulde 1, F. Hase 1, M. Höpfner 1, M. Kaufmann 2, A. Kleinert 1, E. Kretschmer 1, T. Kulessa 5, G. Maucher 1, T. Neubert 3, H. Nordmeyer 1, H. Oelhaf 1, F. Olschewski 6, J. Orphal 1, C. Piesch 1, P. Preusse 2, M. Riese 2, H. Rongen 3, C. Sartorius 1, G. Schardt 3, J. Schillings 5, H. Schneider 5, A. Schönfeld 2, M. K. Sha 1, O. Suminska-Ebersoldt 1, V. Tan 2, J. Ungermann 2 1: Institut für Meteorologie und Klimaforschung, Karlsruher Institut für Technologie, Karlsruhe, Germany 2: Institut für Energie und Klimaforschung - Stratosphäre, Forschungszentrum Jülich, Jülich, Germany 3: Zentralinstitut für Elektronik, Forschungszentrum Jülich, Jülich, Germany 4: Institut für Prozessdatenverarbeitung und Elektronik, Karlsruher Institut für Technologie, Karlsruhe, Germany 5: Zentralinstitut für Technologie, Forschungszentrum Jülich, Jülich, Germany 6: Fachbereich C - Atmosphärenphysik, Bergische Universität Wuppertal, Wuppertal, Germany

3 Outline Scientific background Instrument overview and status Basic requirements geometry and spectrometry Instrument carrier GEOPHYSICA and HALO Characterization results Characterization results from flight data (Shear, Spectral calibration and NESR) First calibrated spectra Exemplary retrieval results Summary

4 Scientific context Source: FZJ, IEK

5 Scientific context GLORIA focuses on studying processes in the upper troposphere and lower stratosphere Atmospheric dynamics Trace gas composition, biomass burning, pollution, methane source and sink Gimballed mount providing agility to move in three axes Limb viewing including tomography capabilities viewing direction: to flight direction Nadir sounding Two nominal measurement modes Chemistry mode optimized w.r.t. high spectral resolution Dynamics mode optimized w.r.t. high spatial resolution GLORIA is the airborne precursor to the space borne PREMIER-IRLS instrument

6 GLORIA: Instrument overview Classical Michelson interferometer with linear slide VHG diode laser used as reference system (LMI) Spectrometer cooled to 215 K with s-co 2 MCT focal plane array with up to 128 x 128 usable pixels Detector cooled to 50 K with Stirling cooler

7 GLORIA: Instrument overview External calibration blackbodies Pointing based on inertial measurement and control unit Modular electronics concept Instrument control over distributed network clients Instrument running with automatic control Monitoring and remote control possible over satellite telemetry

8 Basic requirements Geometry and Spectrometry Vertical coverage Vertical sampling Vertical FOV-FWHM Horizontal coverage and sampling Viewing angle to flight direction Dynamics mode 4 km to 0.8 = km = 2 ~ 150 m ~ km = to 132 (Tomography) Chemistry mode 4 km to 0.8 = km = 2 ~ 150 m ~ km = MOPD (maximum optical path difference) Spectral resolution (apodised) Spectral coverage 0.8 cm 1.25 cm cm -1 8 cm cm cm

9 Carriers GLORIA mounted in the bay of GEOPHYSICA GLORIA mounted in the bellypod of HALO

10 Interferometer shear (ESSenCe flight 2) Interferogram maximum (ZPD) plotted over pixel array Shear < 1 µm cm Static shear is not an issue

11 ESSenCe Flight 2: DC Data

12 Spectral calibration

13 Spectral calibration Cloud affected pixels Line position before spectral calibration Line position after spectral calibration Pixels used for spectral calibration

14 NESR: ESSenCe flight 2 single pixel, measurement and instrument simulation NESR not optimized w.r.t integration time

15 Calibrated spectra (chemistry mode) Spectral radiance [nw/(cm sr cm )] Wavenumber [cm ]

16 Level 2 results: HNO 3 (CM) a priori cm -1 Retrieval result

17 Level 2 results: HNO 3 (CM) intercomparison cm

18 Measurement campaigns ESSenCe (ESA sounder campaign) Maiden flight of GLORIA onboard Russian aircraft M55 Geophysica Nov Dec 2011, two technical flights made from Kiruna, Sweden TACTS (Transport And Composition in the UT/LMS) HALO Demomission One transect to the Cape Verde islands and local flights from Oberpfaffenhofen in Aug Sep 2012 ESMVAL (Earth System Model Validation) HALO September 2012, add-on to TACTS using the same instrumentation, transects from 80 N to 70 S POLSTRACC (The Polar stratosphere in a changing climate) HALO Nov March 2015 CIRRUS-RS (Cirrus-Remote Sensing) 2015 onwards HALO Future balloon missions 2015 onwards Short duration flights Long duration fligths

19 TACTS local flight; flight date:

20 Summary GLORIA has flown for the first time with M55-GEOPHYSICA in Dec 2011 Comparison of GLORIA result with other instruments show quite promising match Successful participation in the TACTS and the ESMVAL campaign on board HALO in Aug and Sep flight hours in 13 scientific flights 27.5 TB of data recorded Data analysis just started The airborne IFTS GLORIA is operational as scientific tool Development of balloon borne instrument has started

21 Thank you for your attention