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© Crown copyright Met Office CAVIAR field campaigns update Stuart Newman UCL, 13 May 2010
© Crown copyright Met Office Initial continuum results from Jungfraujoch flights
© Crown copyright Met Office Summary of flights FlightDateWeather conditionsComments B Cloud at times over JungfraujochPartial NPL data B Initially thin cirrus which clearedGood NPL data B Good clear sky conditionsFLASH sonde* + MetOp overpass B Cloud at times over JungfraujochPartial NPL data B Some thin cirrus encroachingGood NPL data B Excellent clear sky conditionsMetOp overpass B Excellent clear sky conditionsARIES failure B Excellent clear sky conditionsNo TAFTS B Partial cloud over JungfraujochCancelled am flight, pm only * Institute of Applied Physics in Bern launch radiosondes from Payerne equipped with RS92, Snow White and FLASH-B (Lyman-alpha) hygrometers
© Crown copyright Met Office Can we use FWVS data? Dropsondes are widely recognised as most accurate source of humidity data from the aircraft However, for runs immediately after a profile descent (e.g ft down to ft) FWVS may be more representative Attempt to use FWVS humidity data in LBLRTM simulations of ARIES at ft
© Crown copyright Met Office CAVIAR example B Jul-2009 Initial run at high level for radiance measurements (here looking up) Spiral descent over Jungfraujoch observatory measuring in situ water vapour (rapid response FWVS probe used here) Subsequent run at lower level for radiance measurements (here looking up) Determine change in radiance due to water vapour in atmospheric path Derive continuum strength, compare to MT_CKD model in LBLRTM
© Crown copyright Met Office CAVIAR example B Jul-2009 Consistent discrepancy in centre of water vapour band for channels at 1586 and 1598 cm -1 (MT_CKD continuum is relatively strong at 1586 cm -1 compared with measurements)
© Crown copyright Met Office Humidity information from MARSS Helpful to constrain humidity above the aircraft using microwave observations at 183 GHz Microwave Airborne Radiometer Scanning System (MARSS)
© Crown copyright Met Office MARSS humidity channels B467 (19/7/09) Good agreement for channel centred closest to 183 GHz line B471 (27/7/09) Worse agreement for channel 183±1 GHz, better for 183±3 GHz
© Crown copyright Met Office CAVIAR example B Jul-2009 Inconsistent results here, all retrieved continuum strengths < MT_CKD Is this because LBLRTM profile is too moist? Possible to use MARSS data for profile constraint?
© Crown copyright Met Office Preliminary results Selected data from flights B467-B474
© Crown copyright Met Office Plausible results? Rowe PM and Walden VP: "Improved measurements of the foreign-broadened continuum of water vapor in the 6.3 mcr band at -30 o C", Applied Optics, 48(7), (2009).
© Crown copyright Met Office Plausible results? Paynter D, Ptashnik I, Shine K, Smith K, McPheat R, Williams R: "Laboratory measurements of the water vapor continuum in the cm -1 region between 293 K and 351 K", J. Geophys. Res., 2009
© Crown copyright Met Office Towards a conclusion… Groups at Exeter, Imperial College, Reading and NPL will coordinate efforts on two flights where all have good data and atmospheric profile data are reliable Same profile and same underlying radiative transfer model used to ensure consistency Flight B400 on 18/9/2008 over Camborne Flight B467 on 19/7/2009 over Jungfraujoch Move towards synthesis with theoretical and laboratory studies
© Crown copyright Met Office Questions and answers
© Crown copyright Met Office CAVIAR field campaigns meeting Stuart Newman Exeter, 29 April 2010.
© Crown copyright Met Office Update on CAVIAR field experiments Stuart Newman NPL, 29 September 2010.
© Crown copyright Met Office CAVIAR Update to Met Office work on field campaigns Stuart Newman Imperial College, 29 March 2011.
© Crown copyright Met Office Mid-infrared observations of the water vapour continuum from CAVIAR field campaigns Stuart Newman and co-workers Coseners.
TAFTS: Comparing Uncertainties in Atmospheric Profiles with the Water Vapour Continuum Ralph Beeby, Paul Green, Juliet Pickering, John Harries.
© Crown copyright Met Office Initial assessment of ARIES continuum measurements Stuart Newman Imperial College, 16 December 2008.
Overview of Camborne, UK and Jungfraujoch, Switzerland Field Campaigns CAVIAR Annual Meeting 15 th Dec 2009, Abingdon Marc Coleman, Tom Gardiner, Nigel.
TAFTS: CAVIAR field data from Camborne 2008 Ralph Beeby, Paul Green, Juliet Pickering, John Harries.
CAVIAR Field Campaign Meeting, Imperial College 29/3/11 TAFTS: Water Vapour Continuum Data from the 2008 CAVIAR Field Campaign Ralph Beeby, Paul Green,
© Crown copyright Met Office Overview of Camborne field campaign Stuart Newman Imperial College, 16 December 2008.
TAFTS: Atmospheric Profile Uncertainty and Continuum Contribution Ralph Beeby Paul Green, Juliet Pickering 29 th September 2010.
16 December 2008 CAVIAR Annual Meeting Claudine Chen and John E Harries Claudine Chen and John E Harries Space and Atmospheric Physics group, Blackett.
CAVIAR – Continuum Absorption by Visible and Infrared Radiation and its Atmospheric Relevance PI: Keith Shine Department of Meteorology, University of.
1 Water vapour self-continuum within bands: Arguments for dimers Igor Ptashnik 1,2, David Paynter 1, Keith Shine 1 Robert McPheat 3, Kevin Smith 3, Gary.
1 Annual CAVIAR meeting, , Imperial College London Water vapour continuum absorption in near- and middle-IR: Recent investigations Department.
1 All Rights Reserved. No part of this document may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic,
The impact of water vapour continuum on absorption of solar radiation – a preliminary analysis of the impact of the new RAL measurements Julie Chenery,
1 Differences between SSU channels John Nash Manager Upper Air Technology centre, Met Office.
© Crown copyright 2007 Impact studies with satellite observations at the Met Office John Eyre and Steve English Met Office, UK 4th WMO Workshop on "The.
Far-infrared Spectral Radiance Observations of the Arctic Atmosphere Neil Humpage, Paul Green: Imperial College London Dave D. Turner: University of Wisconsin.
Numerical Weather Prediction (Met DA) The Analysis of Satellite Data (lecture 1:Basic Concepts) Tony McNally ECMWF.
1 Proposed new uses for the Ceilometer Network Christine Chiu Ewan OConner, Robin Hogan, James Holmes University of Reading.
Towards a hail climatology Gennaro Cappelluti, Paul Field & Will Hand © Crown copyright 07/0XXX Met Office and the Met Office logo are registered trademarks.
© University of Reading Department of Meteorology Effect of variation of water vapour amount on derived TOA solar spectrum Kaah.
Page 1© Crown copyright 2007 Initial tendencies of cloud regimes in the Met Office Unified Model Keith Williams and Malcolm Brooks Met Office, Hadley Centre.
Numerical Weather Prediction Parametrization of diabatic processes Clouds (4) Cloud Scheme Validation Richard Forbes and Adrian Tompkins
Slide 1 The 4th THORPEX-Asia Science Workshop and 9th ARC Meeting FY-3 satellite data tuning and assimilation Qifeng Lu National Satellite Meteorological.
Robin Hogan, Julien Delanoe Department of Meteorology, University of Reading, UK Richard Forbes European Centre for Medium Range Weather Forecasts Alejandro.
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