Surface deployment of Met Office instruments on St
Surface deployment of Met Office instruments on St Helena 16S, 5.8W Simon Osborne 29th February 2016 Latest news (as such) Delay to St Helena airport certification means commercial flights now planned for May 2016 21 May (St Helena Day) is planned for opening ceremony of airport and is our personal deadline for the recce (with Paquita) Shipment begins from UK port 14 June 2016. Needs to be road-ready 7 June. (Miami radar to depart end April) Too risky not doing a recce ! No BAe-146, and no UAVs in 2016 (but UAVs more likely in 2017...) Comair JNB to HLE weekly; Comair HLE to ASI monthly. Atlantic Star Airlines from LGW (via BJL) monthly? Timeline of events for St Helena, 2016 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Recce (SRO, JDP, PZ) RMS St Helena freight via ASC Set up (2 Cardington + 1 Miami) CLARIFY (2x2 Cardington + 1 Miami + 1 forecaster) Take down (2 Cardington) Sea freight via CPT Final voyages of RMS St Helena Plan B 2017 deployment No BAe-146, but... Airport will be fully open (sea freight via CPT using AW Shipping) LASIC suite on Ascension 1 June 2016 31 October 2017 Possible ORACLES flights to islands in 2017 Met Office UAV ? Miami radar likely to be available Focus more on cloud transition between St Helena and Ascension ? INSTRUMENTATION LIST FOR CLARIFY GROUND-BASED DEPLOYMENT ON ST HELENA ISLAND Met Office o Doppler lidar (bscat, winds, vertical velocity, depolarisation, Halo #35) o Passive microwave radiometer o new RPG-LWP: note delay to order, so will it arrive in time for testing and calibration ?? o Radiosondes (local hydrogen generator) o 8 sondes/day over 28 days = 224 launches o o o o SW and LW broad-band radiometers (downwelling) Grimm 1.109 aerosol counter Automatic weather station (with OPC for cloud detection) Sundries: UPS, solar panels, Toughbook PCs
University of Miami (Paquita Zuidema, Ken Moran) o 94GHz W-band Pulsed Cloud Radar, shipment from Ascension on RMS St Helena. Shipment from Miami begins late April 2016. NASA (Brent Holben) o CIMELS sun-photometer (no news on deployment date) Howard University (Greg Jenkins) o Ozone sondes (on Ascension also); awaiting DoE funding... bonus slides... 25/08 15Z 25/08 18Z 25/08 21Z 26/08 06Z 26/08 09Z 26/08 12Z 26/08 00Z 26/08 03Z St Helena is the white dot in the centre of the satellite imagery. Strong lidar returns close to the surface when in broken cloud conditions. Images from Steve Abel Island effects Karman vortices: sufficient velocity and low cloud ? 12 August 2015 V-pattern: drop in velocity but still low cloud ? 13 August 2015 Unfortunately no ceilometer data on these days ! ACE-2 island wake sortie, 1997 1-minute met data from Bottom Woods, 25-26th August 2015. Marked increase in RH in POC region (is this saturation?). Need to take AWS with our best RH sensor. Marked drop in air temperature. Rainfall detected in POC. Tipping bucket (0.2 mm). Images from Steve Abel Met Office Cardington ground-based research goals at St Helena Main drivers are verification of high resolution NWP modelling of the region Variability in COD, LWP, cloud thickness, fractional cover, drizzle diurnal cycle Estimate reff (Chui et al 2012), thereby Nd Precipitation susceptibility to subcloud aerosol POC intensive case studies De Szoeke et al (2010) VOCALS ship data Support for CLARIFY (e.g. KO2, WP2.2): soundings through plumes; interaction of overlying BB aerosol with cloud; pseudo-Lagrangians between St
Helena and Ascension Calibration flights mid-Sept 2015 Comair (with BA livery), weekly Saturday flights JNB to HLE (5.5 hrs) Commercial flights to start late February 2016. Tickets on sale in the new year www.kulula.com Boeing 737-800 (120 passengers) 15 tons cargo, not palletised. St Helena Met Office at Bottom Woods, 435m asl Will not re-locate to new airport Radiosondes (800g balloons, hydrogen, 1115z daily) Screen Surface temps Winds Evaporation pit Rain gauge Sunshine recorder CT25k Ceilometer New airport, 300m asl: MO forecaster, ATC observers, standard instrument package Soundings, AugSep 2014 Example of Bottom Woods site 1-minute data Site: Date St Helena (Source ID Bottoms Wood 1605) Dry Bulb Temperature Time Dew Point Temperature (From Concrete Grass Humidity) Rainfall Temperature Temperature Humidity Cloud Cloud Amoun Cloud Amoun t Layer Amount t Layer Cloud Height 1 Cloud Height Layer 1 Layer 2 Cloud Height Layer 2 3 Layer 3 Wind Speed Wind Direction Pressure As Read Cloud Total 25/08/2015 00:01 14.51 90.9 13.04 0 14.03 13.9
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