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© Crown copyright Met Office Overview of Camborne field campaign Stuart Newman Imperial College, 16 December 2008.

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Presentation on theme: "© Crown copyright Met Office Overview of Camborne field campaign Stuart Newman Imperial College, 16 December 2008."— Presentation transcript:

1 © Crown copyright Met Office Overview of Camborne field campaign Stuart Newman Imperial College, 16 December 2008

2 © Crown copyright Met Office CAVIAR field campaign #1 Overview of Camborne campaign CAVIAR work package 3.3 Campaign centred on Camborne (Cornwall), 13 August to 25 September 2008 Site provides measurements of meteorological variables and radiosonde balloon profiles of temperature and water vapour FAAM aircraft flew in conjunction with measurements of NPLs high resolution solar-tracking FTS on the ground As a coastal site can exploit downward pointing interferometer measurements from the FAAM aircraft over the sea (homogeneous surface emission) as well as upward pointing measurements Campaign #2 (Jungfraujoch Swiss Alps scientific station, Sept 2009) will be complementary with tenth column water vapour c.f. Camborne

3 © Crown copyright Met Office FAAM BAe capability Blister containing ARIES and TAFTS ARIES interferometer (Bomem MR200) Spectral range cm -1 TAFTS interferometer (Imperial College) Spectral range cm -1 Both instruments view upwelling and downwelling radiances Dropsondes Core chemistry (ozone and CO) Temperature and humidity probes Multi-spectral radiometer (solar) Microwave radiometers Particulates (aerosols and cloud particles) Winds (and more…) Endurance 5½ hours Altitude 20 m – 10.5 km

4 © Crown copyright Met Office Camborne radiosonde station NPL solar-tracking FTS based on site Regular radiosonde ascents (midday) plus extra ascents on request

5 © Crown copyright Met Office Observations versus simulations Methodology for Camborne field campaign NPL solar- tracking FTS at Camborne Surface temperature and emissivity from runs at low level Intensive profiling

6 © Crown copyright Met Office Summary of flights British summer weather in August and September not always conducive to clear sky conditions! Flights conducted on five separate days One day (22/8) included a double flight with refuel Two flights were aborted due to excessive cloud

7 © Crown copyright Met Office Ground-based data NPL solar-tracking Fourier transform spectra Radiosonde balloons GPS integrated water vapour Lidar backscatter Microwave T, q retrievals MICROTOPS sun photometer

8 © Crown copyright Met Office Campaign data cont. Met Office and ECMWF analyses (model fields) MetOp satellite data Aircraft instrument data See

9 © Crown copyright Met Office B396 flight (19 Aug 2008) Persistent boundary layer cloud over Camborne, with some clear sky breaks 10 dropsondes released 12 aircraft runs over Camborne at different altitudes

10 © Crown copyright Met Office B397 flight (22 Aug 2008) Occasional broken boundary layer cloud over Camborne, with good clear sky breaks Double flight with refuel 17 dropsondes released 22 aircraft runs over Camborne at different altitudes

11 © Crown copyright Met Office B400 flight (18 Sep 2008) Very good clear sky conditions Flight included chase of radiosonde for water vapour intercomparison 6 dropsondes released 8 aircraft runs over Camborne at different altitudes

12 © Crown copyright Met Office B400 flight (18 Sep 2008) Best clear sky conditions encountered – no need for cloud hole hunting ARIES and TAFTS seemed to operate well Reasonably stable atmospheric structure High aerosol loading but IR measurements insensitive to this

13 © Crown copyright Met Office ARIES data from 3 altitudes residual differences (obs-calc) / K ARIES nadir brightness temperatures

14 © Crown copyright Met Office TAFTS summary DateFlight no.MeteorologyUseful science TAFTS performance 13/08/08B394N/ATest flight 19/08/08B396Persistent broken StCu, increasing late on YesPartial laser up to 1.5hrs 22/08/08B397/398Some broken StCuYesNo laser 11/09/08B399Too cloudy (Aborted)Good 18/09/08B400ExcellentYesExcellent 23/09/08B404Too cloudy (Aborted)Good

15 © Crown copyright Met Office TAFTS example data Comparison with simulation Upwelling Downwelling Local OAT Simulation (both UW and DW) Ch0 Ch1 Run 4, 34kft (7mins of data) against dropsonde #3

16 © Crown copyright Met Office NPL solar-tracking FTS High resolution spectra at IR/solar wavelengths

17 © Crown copyright Met Office Summary and future work Three successful flights were completed over Camborne in Summer 2008 Comprehensive data set combining radiance observations and measurements of the atmospheric state Ongoing work to derive best estimates for temperature and water vapour profiles for case studies Aircraft interferometer data quality looks good for B400 Future work: corroborate results by comparing with other flight days, and intercompare results from ARIES, TAFTS and NPL FTS

18 © Crown copyright Met Office Questions and answers

19 © Crown copyright Met Office NorthSouth ARIES retrieval (B400)

20 © Crown copyright Met Office B400 case for initial analysis FL340 (250 hPa)FL290 (314 hPa) FL145 (583 hPa)


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