Page 1 CAVIAR flying debrief 2009 NPL calibration and Switzerland flying Paul Green, Ralph Beeby, Alan Last, Juliet Pickering, John Harries Imperial College.

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Presentation transcript:

Page 1 CAVIAR flying debrief 2009 NPL calibration and Switzerland flying Paul Green, Ralph Beeby, Alan Last, Juliet Pickering, John Harries Imperial College London CAVIAR flying debrief (2009) Reading 16 th November 2009

CAVIAR flying debrief (2009) Reading 16 th November 2009 Page 2 Introduction Calibration at NPL Summer 2009 Flight campaign Closing remarks

CAVIAR flying debrief (2009) Reading 16 th November 2009 Page 3 The TAFTS Instrument dual-input Martin-Puplett (polarizing) FTS with two spectral bands measure both nadir and zenith (+net) 4 liquid helium cooled detectors –80-300cm -1 (2 x Ge:Ga) – cm -1 (2 x Si:Sb) resolution: 0.12cm -1 (apodized) single scan: 2 secs 4 internal BB sources employs Brault sampling scheme all built in-house (J Murray + A Canas) UKMO C-130, ARA Egrett, BAe-146

Radiometric calibration At NPL 5 th - 15 th May 2009 Pre-campaign radiometric calibration with 2 external blackbody sources. NPLxBB and ICxBB. Differential instrument, always measures the difference between two views. Temperatures viewed covers those found in flight. Additional runs with both external blackbodies at near-equal but cold temperatures, to isolate the instrument self-emission term. CAVIAR flying debrief (2009) Reading 16 th November 2009 Page 4

Calibration run targets RunUW BBUW temp (degC) DW BBDW temp (degC) Internal BBs hot/cold A1ICxBB-26.2NPLxBB+5, -10, -25, /20 A2ICxBB-31.8NPLxBB+5, -10, -25, -31.8, -45, /amb A3ICxBB-32.4NPLxBB+5, -10, -25, -32.4, -40, -55 amb/60(40) B1NPLxBB-10, -25, -40, -41.2, ICxBB /20 B2NPLxBB+5ICxBB-4460/amb B3NPLxBB+5, -10, -25, -40, -55 ICxBB-4070/40 CAVIAR flying debrief (2009) Reading 16 th November 2009 Page 5

Summer flying July – 12 August 2009 Based out of Basel, Switzerland over the Jungfraujoch station. 38.5hrs over 9 flights CAVIAR flying debrief (2009) Reading 16 th November 2009 Page 6

CAVIAR 2008 Flight schedule DateFlightMeteorologyTAFTS performance 02/07/09B465N/ATest flight 16/07/09B466Clear (partial MC)R6-10 excellent; R1-6, 11,12 good 19/07/09B467*Some thin Ci, ↓R3-7R excellent; R1-5 good 20/07/09B468Night balloon launchR1,2,6,7 good; R3-5,8,9 ok 25/07/09B469StCu later in flightAll runs excellent 26/07/09B470*Occasional thin CiAll runs excellent 27/07/09B471*ClearR1-4 excellent; R5,6 lost chs; No R7,8 29/07/09B472ClearR1-8 excellent; No R9-13 [ARIES] 01/08/09B473ClearDid not fly - Helium 04/08/09B474*Partial MCR1-6 excellent; R7,8 lost chs; No R9-11 CAVIAR flying debrief (2009) Reading 16 th November 2009 Page 7 MC – mountain cloud

B471 – 27/07/09 CAVIAR flying debrief (2009) Reading 16 th November 2009 Page 8 Profile 7 ~18kft 09:58UTC Profile 7 ~20kft 09:55UTC Profile 2 ~16kft 07:40UTC

B471 - Atmospheric profile data CAVIAR flying debrief (2009) Reading 16 th November 2009 Page dropsonde Payerne MLS

B471 Run 1 CAVIAR flying debrief (2009) Reading 16 th November 2009 Page 10 OAT 240.8K

B471 Run 1 CAVIAR flying debrief (2009) Reading 16 th November 2009 Page 11

Plan (for Swiss data) Concentrate on B471. Calibrate B471 runs 2,3,4,5 and 6. Compare with ARIES data (in cross-over region). Uncertainty budget calculations with updated ε and ΔT from NPL-based calibration work. Analyse dropsonde / Payerne radiosonde data. Determine most appropriate profile for each run. LBL code updates – HITRAN2008 / Tennyson list. Make continuum assessment. Publish / move onto other flight. CAVIAR flight debrief (2009) Reading 16 th November 2009 Page 12

CAVIAR flying debrief (2009) Reading 16 th November 2009 Page 13 Closing remarks A very successful campaign. Good data on a number of flight levels from all 8 flights. Excellent data quality –Low noise on interferograms –Reliable metrology laser fringes –Best campaign to date with TAFTS instrument re. Quantity and quality of data recorded.