1. Radiation Research Group: People, Instruments and Campaigns
Chawn Harlow, OBR Conference, 11 Dec. 2012
© Crown copyright Met Office

2. Outline Introduction to OBR’s Radiation Group
Semi-Arid Land Surface Temperature and IASI Calibration Experiment (SALSTICE)
International Sub-mm Airborne Radiometer (ISMAR)
© Crown copyright Met Office

3. Radiation Group’s activities
FAAM aircraft campaigns
Planning and implementation
Analysis of radiation and ancillary data.
Radiative transfer code development, evaluation and exploitation.
HT-FRTC
Havemann-Taylor Fast Radiative Transfer Code
fast radiative transfer code that OBR has developed allowing calculations of IASI spectra ~60 faster than its leading competitors.
Defence and satellite data applications.
© Crown copyright Met Office

4. Radiation Group Anthony Baran Stuart Fox Stephan Havemann
Expert on EM scattering in Cirrus.
Stuart Fox
Our new guy who used to work for DO.
ISMAR and SALSTICE work.
Stephan Havemann
Expert on the fast code HT-FRTC used in defence application Neon and recently incorporated into RTTOV
© Crown copyright Met Office

5. Radiation Group Stuart Newman Jean-Claude Thelen Alan Vance
Expert on spectroscopy in the IR.
Lead JAIVEx and CAVIAR.
Jean-Claude Thelen
Expert on the fast code. Incorporated scattering routine.
Alan Vance
Expert on ARIES infrared interferometer and WVSS-II.
© Crown copyright Met Office

6. SALSTICE: Semi-Arid Land Surface Temperature and IASI Calibration Experiment
© Crown copyright Met Office

7. Objectives of SALSTICE
Diagnose cause of land surface temperature biases in UM over semi-arid regions.
Cal/val of IASI-2 instrument on METOP-B for EUMETSAT customer.
© Crown copyright Met Office

8. Land surface temperature bias
Tucson
Biases in red ~10 K
Model underestimates the diurnal cycle in LST.
Highest biases in semi-arid regions
Greatest biases in March thru June.
Base chosen to be Tucson, Arizona, where the biases are large, close to the American IASI collaborators.
© Crown copyright Met Office

9. ISMAR: International Sub-mm Airborne Radiometer
© Crown copyright Met Office

10. ISMAR International Sub-mm Airborne Radiometer
Channels
(GHz)
Passband offsets
23.8
±0.07
50.1
±0.05
88.992
±1.1
118.75
±1.1,±1.5,±2.1,±3.0,±5.0
157.05
±2.6
183.31
±1,±3,±7
243.2
±2.5
325.15
±1.5,±3.5,±9.5
424.7
±1.0,±1.5,±4.0
448
±1.4,±3.0,±7.2
664
±4.2
874.4
±6.0
International Sub-mm Airborne Radiometer
ISMAR is a sub-millimetre radiometer with sensitivity to ice particles.
ISMAR’s channels mimic those of the Ice Cloud Imager an instrument selected for the Post-EPS generation of meteorological satellites due for launch in the 2020s.
Combined MARSS, Deimos and ISMAR channels mimic ICI plus AMSU needed to sound ice cloud.
FAAM, an ICI airborne demonstrator.
© Crown copyright Met Office

11. ICI sounding capability
Channels selected to have contributions from throughout troposphere.
Channel selection allows some sounding of ice cloud when combined with temperature and humidity sounding of AMSU and IASI.
Figure courtesy of Susan Crewel
© Crown copyright Met Office

12. Two ISMAR campaigns Prestwick, Nov. 2013
ISMAR first put to trial
Labrador, Canada, Apr. or May 2014
Second ISMAR campaign
Labrador chosen to give good chance of Cirrus cover and to allow Stratocumulus studies in the Labrador Sea
© Crown copyright Met Office

13. Other Activities HT-FRTC, “The Fast Code”
a tool for development of defence applications and fast code for satellite data assimilation.
Development of polarized version.
Ensemble Model of Cirrus Scattering
Continued development, testing and implementation in the UM
MIZ campaign in April 2014
Based in NWT, Canada.
evaluation of UM sea-ice surface temps and concentrations
© Crown copyright Met Office

14. Outline Introduction to OBR’s Radiation Group
Semi-Arid Land Surface Temperature and IASI Calibration Experiment (SALSTICE)
International Sub-mm Airborne Radiometer (ISMAR)
© Crown copyright Met Office

15.
Questions?
© Crown copyright Met Office