The primary objective is to investigate the impact of local meteorology on coastal air quality and thestructure and evolution of the coastal boundary layer. We have been making measurements of meteorological parameters and chemical constituents at theWeybourne Atmospheric Observatory (WAO) on the north Norfolk coast since 1993 (with supportfrom NCAS since 2002). WAO experiences a range of air-mass types, from relatively clean air from the Arctic, to polluted air from the UK and continental Europe. It has long been suspected that local meteorological phenomena have contributed to the pattern of air quality observations, which at times cannot easily be explained by the large scale flow, as indicated ECMWF trajectories. For example sea and land breezes can re-circulate pollutants, whilst some pollutants can be rapidly lost to surface vegetation and soils when the nocturnal boundary layer is shallow.

The objectives of the flights will be to:

  1. Characterise the chemical composition of the air above and around WAO in various meteorological conditions to determine how representative the observations at WAO are of the coastal region and ofthe air-mass origin (esp. in the case ofmaritime/Arctic air).
  2. Determine the local flow patterns that can be established around WAO that may influence the redistribution of pollutants and to aid future identification of such patterns with the more limited vertical data that is routinely collected at WAO
  3. Identify patterns that decouple polluted layers from the surface
  4. Characterise the off-shore pollution sources (ship emissions, emissions from off-shore gas platforms) that impact measurements at WAO under maritime conditions.
  5. Provide test cases for the one-dimensional MISTRA model of vertical profiles of trace components in the boundary layer and lower free troposphere, especially providing information about vertical exchange. It is anticipated that 4 flights will provide us with considerable insight into the impact of local meteorology on air quality at WAO. In addition, they will be highly informative regarding the value of proposing a larger study with more flights, over a longer period and with a more comprehensive instrument suite both on the aircraft and at WAO.

Instruments - Core Consoles, Core Chemistry, Cloud Physics (PCASP), CPC, PtRMS, PERCA, WAS/PAN, Peroxide/Formaldehyde, Mini-Lidar, Photometers

Lead Pilot - tbd
Lead Flight Ops - tbd
PI - Claire Reeves (University of East Anglia) This email address is being protected from spambots. You need JavaScript enabled to view it.

The main issues are the pristine ice number concentration, snow evolution leading to surface precipitation, mixed-phase and cold cloud length scales. The main goals in order of priority are:
  • To provide statistical datasets to act as a critical holistic test of three phase microphysics as RICO did for warm cloud microphysics (e.g. cold air outbreak).
  • To test whether the background aerosol concentration active as ice nuclei can be used to predict the pristine ice concentration in cases where there is limited ice multiplication.
  • To test detailed microphysical assumptions in model, which include capacitance, aggregation efficiency vs temperature (conversion rate from 'ice' to 'snow' categories), mass-dimension relations and area-dimension relations (these combine to give fall-speed).
  • To investigate small ice (sub 100 microns) concentration controversy.

Equipment - Core Consoles (GE,TWC,VIDEO,NEVZOROV,JW), Core Chemistry, JIF Rack (gps,tdlas), LIDAR, AVAPS, CPI, FWVS/CCN/cpc, AMS, CVI, Cloud Physics (2D-C/2D-P/PCASP/FFSSP/SID2/CIP25/CIP100), CDP, INC, WET NEPHELOMETER/PSAP/filters, sws/shim, radiometer racks (aries/deimos/marss).

Campaign Specialist: TBA
Lead Pilot - TBA
Lead Flight Ops - TBA
PI: R Cotton (Met Office) This email address is being protected from spambots. You need JavaScript enabled to view it..

Measurements of shortwave radiation for the validation of a new sea surface reflectance model for use in the Edwards-Slingo radiation code.

Equipment: Core Consoles, Core Chemistry, Cloud Physics, SWS/SHIMS, Radiometeters 1&2(ARIES,DEIMOS,MARSS,irr), ccn/fwvs, inc, cpi, nephelometer/wet-nephelometer/psap

Campaign Specialist - TBD
PIs - J Taylor (Met Office) This email address is being protected from spambots. You need JavaScript enabled to view it..

QUEFA - Quantifying Urban Emissions From the Air, 20 hours, Nov-Dec 2009.

The proposal aims to provide observations of anthropogenic pollutant mixing ratios during circumnavigational flights of London and Norwich, to calculate top-down emission estimates from each city to draw comparisons between observed emissions and those calculated for the validation of (NAEI) and other emission inventories.

Instrument fit: Core Consoles. Mini Lidar, Core Chemistry: WAS, FAAM NOx, PAN, PERCA.

PI: Dr. James R. Hopkins (NCAS University of York)This email address is being protected from spambots. You need JavaScript enabled to view it..

 

Jul - Sep 2008(UK) and Jul 2009(Switzerland), 50 flying hours

The campaign will focus on determining the strength and temperature dependence of the water vapour continuum over a range of wavelengths. In doing so, the aim is to determine whether water vapour dimers, or the far wings of monomer lines, or a combination of both, are responsible for the continuum absorption, and put the continuum on a more secure theoretical footing.
The measurements will be co-ordinated with infrared ground-based sun-pointing Fourier Transform Spectrometer (FTS) observations by the National Physical Laboratory at Camborne (UK) and Jungfraujoch (Switzerland). The choice of locations has been made to enable this ground-based instrumentation to observe under very different conditions of total column water vapour, as this will allow study of different parts of the infrared spectrum.
The campaign will be part of a large consortium which includes theoretical studies of the water dimer, FTS and Cavity Ring Down measurements of continuum absorption in the laboratory and modelling studies of the impact of the continuum on the Earth’s radiation budget for present day and possible future climates.

Instrumentation - Core Consoles, Core Chemistry, Radiometer Racks (ARIES/DEIMOS/TAFTS/MARSS), SWS, Cloud Physics (PCASP/FFSSP/2D-P/2D-C), AVAPS, Lidar, Wet-Nephelometer/PSAP, FWVS.

  • Detachment Manager - Guy Gratton
  • Campaign Specialist -  Doug Anderson
  • Project Pilot - Al Roberts
  • PIs - K Shine (Reading) This email address is being protected from spambots. You need JavaScript enabled to view it. and J Taylor (Met Office) This email address is being protected from spambots. You need JavaScript enabled to view it.

 

{backbutton}