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IAGOS CARIBIC Instrumentation (Status of March 2016)

Container Frontside



Container Backside


  Instrument Short Description
  ISOWAT A diode-laser spectrometer to measure the D/H and 18O/16O isotope ratios of water vapor. It is connected to the total water inlet. ISOWAT uses an RT laser diode (2.64 µm), a multi-pass cell (giving 40 meter) at 60 hPa and 40 °C, a reference cell at to stabilize laser wavelength, and a background detector.
  PTRMS The proton transfer reaction mass spectrometer (IONICON) measures mainly acetone, methanol, and acetonitril (CH3CN). Calibration is via a permeation source.
  DOAS (Differential Optical Absorption Spectroscopy) contains 3 thermoelectrically chilled UV-VIS spectrometers, that are connected via 3 silica, 6 fiber, optical cables to the 3 mini-telescopes in the inlet system. Measured are SO2, BrO, HONO, NO2. Each month thousands of spectra are recorded.
  OPSS is an optical particle size spectrometer
Species measured:
Particle size distribution (0.14 μm < dp < 1.05 μm) and derived particle number, surface, volume, and mass concentrations.
  CPC 1 (Hermann) The Condensation Particle Counter unit contains 2 CPCs (TSI Model 7610) with butanol as fluid. Measured is the integral particle number concentration for particles larger than 4 and 12 nm.
  CPC 2 and particle sampler This condensation particle unit contains the third CPC having a lower limit of 18 nm and the aerosol particle sampler. The impactor based sampler has a cyclone separator to reject particles over 2 micron diameter. The impactor does not capture particles below 80 nm. There are 16 chambers with 3 impactors. The major impactor samples are subjected to PIXE and PESA giving detailed elemental composition from hydrogen onwards. The minor samples are for mainly electron microscopy.
  TRU (Power Supply 1) is activated while the aircraft is above take-off and landing conditions. Most equipment is activated only at pressures below 500 hPa to reduce risk of contamination.
  The aircraft-container interface Here all cables for data, light, power, electronics, air outlet, inlets, are connected. The container is installed by Lufthansa technicians within 20 minutes using extensive check lists.
  CH4 and CO2 are measured using a Los Gatos analyzer, equipped with 2 lasers and an off- axis multi-pass cell (ICOS, light path 6 kilometer, 40 0C and 184 hPa).
  Ozone OMCAL This lab-built compact high accuracy and precision uv absorption spectrometer also serves as in-flight calibration unit.
  Ozone OSCAR This lab-built unit is very fast using chemiluminiscence on a small disk with a dye.
  Mercury Total reactive mercury is alternatingly captured in two adsorption tubes on gold followed by its detection using atomic absorption photospectrometry and mercury lamp light (Tekran).
  Water vapor and ice The total water vapor inlet is connected to a photo-acoustic analyzer and a Buck frost-point hygrometer. The photo-acoustic system is fast, the hygrometer is precise and accurate.
  Water vapor The gaseous water vapor inlet is connected to a second photo-acoustic detector. By using both water detection systems, cloud water and super-saturation can be measured.
  BPS (Power Supply 2) This power supply is switched on earliest and switched of latest. It has a limited capacity for only the most essential functions when the aircraft is not cruising.
  NO, NO2, NOy The latest addition to this lab-built system is a photolysis cell based on UV diodes. Used are two Ecophysics NO detectors, ozone is made using oxygen, and hydrogen gas is used to reduce NOy on a gold catalyst.
  The Master-PC controls all equipment via an ethernetnetworks. It records the aircraft's ARINC 428 flight parameters, including pressures, temperatures, and video picture frames.
  SP2 Single Particle Soot Photometer SP2.
  Carbon monoxide is detected by VUV fluorescence (Aerolaser).
  Carbon dioxide This unit is based on a LicorNDIR analyzer.
  Calibration and operating gases 12 pressure bottles located  in a separate rack. The supplies must last for over 40 flight hours (30,000 km).
  The Data Distribution Box is the interface between the aircraft and the container for data, temperature data and regulators.
  The pumping unit for TRAC and HIRES uses 2 dual stage metal bellows pumps. The first stage in parallel, the subsequent stage in series.
  The general purpose pump unit pumps air through various analyzers, namely CPCs and CO.
  Air sampler HIRES This High Resolution sampler contains 88 light weight stainless steel 1 liter flasks, wall thickness 0.25 mm, filled to nominally 4 bar. Air is purged 8 times by pressurizing and bleeding. HIRES samples are presently analyzed for greenhouse gases and nmhc.
  Air sampler TRAC 1 and 2 This system contains 2 units of 14 2.7 liter glass flasks filled to nominally 4bar. Air is purged by flushing. The glass flasks allow for accurate isotope analyses of CO2 (no 18O exchange) and are routinely analyzed for greenhouse gases, nmhc, and halocarbons. Three pair of units allows for turn-over time for all analyses in 3 laboratories.
  Ventilation systems displace large amounts of air (at about 850 hPa) to carry away heat and to even out temperature differences. The cargo bay is cooled via the aircraft's air conditioning system.