© University of Reading 2008 www.reading.ac.uk 28 June 2015 CAVIAR Experimenters Meeting 2009 Liam Tallis.

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Presentation transcript:

© University of Reading June 2015 CAVIAR Experimenters Meeting 2009 Liam Tallis

INTRODUCTION 2

Lab View 3

Sunsets 4

Introduction Assessment of the consistency of water vapour lines intensities in recent HITRAN databases Towards an absolute calibration Water Profile for Jungfraujoch Future work 5

ASSESSMENT OF THE CONSISTENCY OF WATER VAPOUR LINES INTENSITIES IN RECENT HITRAN DATABASES 6

Consistency Assessment Analysis of the consistency of water vapour lines in recent HITRAN databases Similar way to Casanova et. al. (2006) Optical depth spectrum given by Where F m is the measured signal by the FTIR, F s is the extraterestrial irradiance given by Kurucz (1995), τ m is the optical depth, θ is the solar zenith angle and k(v) is an unknown calibration factor. 7

Consistency Assessment Rearrangement ignoring the calibration factor (and a few other approximations) We know have a “pseudo” optical depth spectrum This spectrum will allow us to analyse the consistency between observation and model 8

Consistency Assessment Optical depth is calculated for water vapour ( τ w ) and for five other principle absorbers in the region: CH 4, CO 2, O 2, N 2 O and O 3 ( τ g ) using RFM (v4.28) Linear fit of the “pseudo” optical depth to that calculated by RFM Fit pseudo to the form of a x τ w + b x τ g + c 9

Consistency Assessment a x τ w + b x τ g + c b is tightly bound to be a value between 0.95 to 1.05 – An assumption made is other gases well know – Allowed to vary slightly for any minor error in the column amounts c is allowed to vary more freely – c is a offset parameter that varies slowly with wavelength a is allowed to vary between 0 and 3 – a is the important parameter – tells us the factor line intensities must be multiplied by 10

Consistency Assessment 11

Consistency Assessment 12

Consistency Assessment 13

Consistency Assessment Camborne Field Campaign InSb / CaF 2 Typically for 0.03cm-1 resolution spectra Over various days, radiosondes, water columns 14 HITRAN2004HITRAN2008H08 / H04 Average a Average a 3000 cm -1 – 8000 cm Average a 8000 cm -1 – 9500 cm Average a cm cm

Consistency Assessment 15 HITRAN2004HITRAN2008H08 / H04 Average a Average a 3000 cm -1 – 8000 cm Average a 8000 cm -1 – 9500 cm Average a cm cm Ratio of 3000 cm cm -1 to 8000 cm -1 – 9500 cm -1 For HITRAN04 = 0.846, St Dev= For HITRAN08 = 0.845, St Dev= 0.010

Consistency Assessment Camborne Field Campaign MCT / KBr Problems! Fit appears to be good... But scaling factor required for water vapour lines feels wrong Typical “a” value ~

Consistency Assessment Camborne Field Campaign MCT / KBr Typically for 0.03cm -1 resolution spectra Over various days, radiosondes, water columns 17 HITRAN2004HITRAN2008H08 / H04 Average a 700 cm -1 – 1400 cm Average a 800 cm -1 – 1000 cm Average a 1100 cm cm

Consistency Assessment 18

Consistency Assessment 19

Consistency Assessment 20

TOWARDS AN ABSOLUTE CALIBRATION 21

Towards an Absolute Calibration Calibrations before each field campaign at NPL NPL produce a calibration function which when used with spectral data gives an irradiance [W/m2/FT o/p unit] Calibration x Spectral Data = Calibrated Spectra Extraterrestrial irradiance given by Kurucz’s (1995) database 22

Towards an Absolute Calibration 23

Towards an Absolute Calibration 24

Towards an Absolute Calibration We know the signal measured by the FT is given by And thus by rearranging, we can work out the optical depth 25

Towards an Absolute Calibration 26

Towards an Absolute Calibration 27

Towards an Absolute Calibration 28

Towards an Absolute Calibration 29

Towards an Absolute Calibration Microtops II Sunphotometer 13/08/2008 AOT380 = 0.465, AOT440 = 0.486, AOT675 = 0.577, AOT936 = 0.705, AOT1020 = Campaign Average AOT380 = 0.22, AOT440 = 0.17, AOT675 = 0.12, AOT936 = 0.09, AOT1020 =

Towards an Absolute Calibration 31

Towards an Absolute Calibration 32

WATER PROFILE FOR JUNGFRAUJOCH 33

Water Profile for Jungfraujoch 34 Radiosonde (Payerne) Dropsonde (FAAM) FAAM Aircraft GPS IWV ECMWF Forecast Fields STARTWAVE Database, University of Bern – GPS Water Vapour – Column Water from Payerne Radiosonde

Water Profile for Jungfraujoch 35

Water Profile for Jungfraujoch 36

Water Profile for Jungfraujoch 37 1 st August 2009

FUTURE WORK 38

Future Work Analysis of the consistency of water vapour lines in recent HITRAN databases – Any improvements to MCT fit possible? – Repeat this style analysis for Jungfraujoch – Try with new ACE-FTS extraterrestrial line list (Hase et. al, JQSRT 2009) Absolute Calibration – Account for difference between calibrated spectra and extraterrestrial irradiance (in atmospheric windows) – Use Reading’s RFM + DISORT Code Water Profile for Jungfraujoch – Continued work in this area Questions? 39