Jena 2013 – scientific programme
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UP: Fachverband Umweltphysik
UP 4: Postersession
UP 4.3: Poster
Tuesday, February 26, 2013, 17:15–18:30, Poster EG
Towards traceability in line parameter measurement of CO2 and H2O at 2.7 micrometer by tunable diode laser absorption spectroscopy — •Javis Nwaboh1, Andrea Pogány1, Olav Werhahn1, and Volker Ebert1, 2 — 1Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig — 2Center of Smart Interfaces, Technische Universiät Darmstadt, Petersenstr. 32, 64287 Darmstadt
Carbon dioxide (CO2) and water vapor (H2O) are important molecules for environmental monitoring. Line strengths and collision broadening coefficients of these species are often used in environmental monitoring and climate modeling; therefore, precise knowledge of these line data is becoming indispensible. Line data retrieved by different spectroscopic techniques are collected in databases such as HITRAN and GEISA. These databases are very useful to the environmental monitoring community. However, the traceability of line data to the SI system of units and uncertainty assessments are often incomplete or missing in the literature. We present measurements of line strengths and broadening coefficients, of single CO2 and H2O lines in the absorption bands around 2.7 micrometer, using tunable diode laser absorption spectroscopy (TDLAS). We provide a GUM-compliant uncertainty assessment for the measured line data and address traceability to the SI units. The relative uncertainties of our line strengths and broadening coefficients are in the 2 and 0.8 % range, respectively. This work has been initiated within the projects MACPoll and GAS, jointly funded by the EMRP participating countries within EURAMET and the EU.