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Published byBrianna Clayton
Modified over 3 years ago
© 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 B466 16.07.09Cloud at times over JungfraujochPartial NPL data B467 19.07.09Initially thin cirrus which clearedGood NPL data B468 20.7.09Good clear sky conditionsFLASH sonde* + MetOp overpass B469 25.07.09Cloud at times over JungfraujochPartial NPL data B470 26.07.09Some thin cirrus encroachingGood NPL data B471 27.07.09Excellent clear sky conditionsMetOp overpass B472 29.07.09Excellent clear sky conditionsARIES failure B473 01.08.09Excellent clear sky conditionsNo TAFTS B474 04.08.09Partial 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. 35000 ft down to 15000 ft) FWVS may be more representative Attempt to use FWVS humidity data in LBLRTM simulations of ARIES at 15000 ft
© Crown copyright Met Office CAVIAR example B467 19-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 B467 19-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 B471 27-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), 1358-65 (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 1200 - 8000 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 Update on CAVIAR field experiments Stuart Newman NPL, 29 September 2010.
© Crown copyright Met Office CAVIAR field campaigns meeting Stuart Newman Exeter, 29 April 2010.
© Crown copyright Met Office CAVIAR Update to Met Office work on field campaigns Stuart Newman Imperial College, 29 March 2011.
CAVIAR flights 9 flights Runs 15,000 to 35,000 feet Spiral descents over Jungfraujoch Dropsondes from high level MetOp underflights FL150 FL350.
© Crown copyright Met Office CAVIAR ARIES water vapour continuum results Stuart Newman Reading, 6 December 2010.
© Crown copyright Met Office Mid-infrared observations of the water vapour continuum from CAVIAR field campaigns Stuart Newman and co-workers Coseners.
© Crown copyright Met Office Initial assessment of ARIES continuum measurements Stuart Newman Imperial College, 16 December 2008.
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 2007 CAVIAR flight plans Stuart Newman, Met Office, Exeter, UK.
TAFTS: Comparing Uncertainties in Atmospheric Profiles with the Water Vapour Continuum Ralph Beeby, Paul Green, Juliet Pickering, John Harries.
© Crown copyright Met Office Overview of Camborne field campaign Stuart Newman Imperial College, 16 December 2008.
© Crown copyright Met Office An update on plans for CAVIAR field campaigns Stuart Newman NPL, 2 June 2008.
© Crown copyright Met Office First look at Camborne data Stuart Newman Reading, 25 November 2008.
TAFTS: Atmospheric Profile Uncertainty and Continuum Contribution Ralph Beeby Paul Green, Juliet Pickering 29 th September 2010.
TAFTS: CAVIAR field data from Camborne 2008 Ralph Beeby, Paul Green, Juliet Pickering, John Harries.
Overview of Camborne, UK and Jungfraujoch, Switzerland Field Campaigns CAVIAR Annual Meeting 15 th Dec 2009, Abingdon Marc Coleman, Tom Gardiner, Nigel.
Flight Data Simulations and the Extraction of the Continuum from the Far-IR Ralph Beeby Paul Green, Juliet Pickering, John Harries.
© Crown copyright Met Office STICCS science aims Stuart Fox, Chawn Harlow, Clare Lee, Patrick Eriksson, Eric Defer + others…
Page 1 CAVIAR: TAFTS flight planning: Pt 1 Paul Green, John Harries, Alan Last, Ralph Beeby Imperial College London CAVIAR flight planning meeting 20th.
TAFTS: Comparison of Camborne Spectra with Simulations Ralph Beeby, Paul Green, Juliet Pickering CAVIAR Field Campaign Meeting, Reading University, 6/12/10.
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