ECOWAR: Earth COoling by WAter vapour Radiation COBRA: Campagna di Osservazioni della Banda Rotazionale del vapor d Acqua

Transcription

1 ECOWAR: Earth COoling by WAter vapour Radiation COBRA: Campagna di Osservazioni della Banda Rotazionale del vapor d Acqua A research contribution to spectrally resolved observations of the Earth emission spectrum in the water vapour rotational band (17-50 micron) to test models of atmospheric radiative transfer.

2 Objective Perform a field campaign in the Mountains (Alps) to observe atmospheric emitted spectral radiance in condition of low water vapour content, and use them Validation of models of atmospheric radiative transfer in cloudy and clear skies; Evaluation of spectral absorption properties of water vapour in the rotational band from 200 to 600 (cm-1); Evaluation of the modelling capability in clear and cloudy conditions and reconstruction of the radiative diabatic effects; Demonstration of the rotational water vapour band capability as a temperature and humidity sounding system, especially to discriminate lower troposphere water vapour from its concentration in the higher troposphere. 2

3 Where we are with the project The main field campaign has been performed in March this year, in the Alps The data have been checked for quality and consistency This talk is dealing mostly with the campaign description and preliminary results 3

4 Possible contribution to the validation and/or complementary information from/to satellite missions During the campaign we had nice coincidence with various satellites ENVISAT (MIPAS) METOP/1 (IASI) AQUA (AIRS) Terra Calipso 4

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6 ABB-BOMEM MR100 Spectral Range micron, Sampling rate cm-1 VAISALA RS-92K Radio-sounding Unit 6

7 REFIR/BB developed at IFAC/CNR within a collaboration among ADGB, DIFA, IMAA, INFM, IFAC 7

8 DIFA-Università della Basificata Lidar Short Name: BASIL particle backscatter at 355 and 532 nm particle extinction at 355 nm particle depolarization at 355 nm water vapour mixing ratio atmospheric temperature Tatiana and Paolo in the lidar laboratory 8

9 Test Site Campaign 3-20 March

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11 Night March 2007 ABB-Bomem (DTGS) Spectrum (Watt/m2-cm-1) Serie di 60 spettri (2 min 18 sec/spettro), 20:59 alle 23:17 ora locale

12 Night March 2007, Example of Spectrum observed with the ABBBomem (DTGS), Acquisition time 11 min 30 sec, sampling rate cm-1 Cervinia Station, 10 March 2007, UTC 20:58:00, itegration time 11 min 30 sec,sampling rate cm NESR Spectrum, ABB-Bomem, DTGS Spectrum (mw/m2-cm-1-sr)

13 Tobin, D.C., F.A. Best, P.D. Brown, S.A. Clough, R.G. Dedecker, R.G. Ellingson, R.K. Garcia, H.B. Howell, R.O. Knuteson, E.J. Mlawer, H.E. Revercomb, J.F. Short, P.F.W. van Delst, and V.P. Walden, "Downwelling spectral radiance observations at the SHEBA ice station: Water vapor continuum measurements from 17 to 26μm," JGR 104(D2): Cervinia Station, 10 March 2007, UTC 20:58:00, itegration time 11 min 30 sec,sampling rate cm NESR Spectrum, ABB-Bomem, DTGS Spectrum (mw/m2-cm-1-sr)

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15 Night March 2007, Example of spectrum recorded by the ABB-Bomem (MCT detector) Cervinia Station, UTC 22:35, integration time 11 min 30 sec, Night March Spectrum (mw/m2-cm-1-sr) NESR Spectrum, ABB-Bomem (MCT)

16 Njght March 2007 ABB-Bomem (MCT) Cervinia 2000 m Media su 5 Spettri (circa 10 min) 300 BT Spectrum (K) ABB Bomem (MCT)

17 Night March 2007 REFIR/PAD, Testa Grigia 3500 m BT Spectrum (K) REFIR PAD

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20 Consistency Check FTIR/ABB MCT detector, Cervinia 14 March 2007, 20:22:16 to 20:24:33, pw=5.5 mm Spectrum (Watt/m2-cm-1-sr) Spectrum (Watt/m2-cm-1-sr) 0 Calculated ABB/MCT

21 Conclusions The COBRA campaign has been very successful in terms of weather conditions COBRA is unique in terms of passive and active systems capability: Two FTS equipped with DTGS and MCT detectors able to sense down to 350 cm-1 One lidar system to sense aerosol, clouds, water vapour and temperature. The co-location of Lidar and FTS will allow us to analyze the data with a time resolution of 10 minutes Based on the preliminary analysis for the quality of data, we expect COBRA to contribute, with unprecedented accuracy to a series a basic issues in the Far Infrared spectroscopy and radiative transfer 21

22 ECOWAR: Earth COoling by WAter vapour Radiation COBRA: Campagna di Osservazioni della Banda Rotazionale del vapor d Acqua Spectrally resolved observations of Earth's emission spectrum in the water vapour rotational band (17-50 micron) to test models of atmospheric radiative transfer (Italian Ministry of University and Research, DM n feb. 2005, project # ) Institutions Contact Person University of Basilicata, Dept. DIFA C. Serio (P.I.) serio@unibas.it University of Bologna, Dept. of Physics R. Rizzi rrizzi@adgb.df.unibo.it University of Bologna, Dept. of Physical Chemistry M. Carlotti carlotti@fci.unibo.it University of Rome, La Sapienza, Dept. of Physics Daniele Fuà daniele.fua@uniroma1.it In collaboration with: IMAA/CNR G. Pavese pavese@imaa.cnr.it IFAC/CNR L. Palchetti L.Palchetti@ifac.cnr.it With the participation of: INGV G. Muscari muscari@ingv.it Thanks to Centro Nazionale di Meteorologia e Climatologia Aeronautica City of Valtournenche (Breuil-Cervinia) IAMAS/MS003 Symposium Aerosol, Radiation and Clouds (IRC, ICCP, ICACGP), 06 July

23 More Information at the web site under Research Programs, COBRAECOWAR 23