期刊
APPLIED SCIENCES-BASEL
卷 11, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/app11115189
关键词
water vapor; laser spectroscopy; near-infrared; dTDLAS; eddy covariance
The proposed concept presents a calibration-free, first-principles, open-path dTDLAS hygrometer design with an uncertainty of below 4.5%. Static comparison between the new optics setup and a traceable dew point mirror hygrometer showed a systematic relative deviation of 2.6% with a maximal relative error of 2.2%, fulfilling the requirements of the proposed airborne EC hygrometer in terms of static precision and accuracy.
Water vapor fluxes play a key role in the energy budget of the atmosphere, and better flux measurements are needed to improve our understanding of the formation of clouds and storms. Large-scale measurements of these fluxes are possible by employing the eddy correlation (EC) method from an aircraft. A hygrometer used for such measurements needs to deliver a temporal resolution of at least 10 Hz while reliably operating in the harsh conditions on the exterior of an aircraft. Here, we present a design concept for a calibration-free, first-principles, open-path dTDLAS hygrometer with a planar, circular and rotationally symmetric multipass cell with new, angled coupling optics. From our measurements, the uncertainty of the instrument is estimated to be below 4.5% (coverage factor k = 1). A static intercomparison between a dTDLAS prototype of the new optics setup and a traceable dew point mirror hygrometer was conducted and showed a systematic relative deviation of 2.6% with a maximal relative error of 2.2%. Combined with a precision of around 1 ppm H2O at tropospheric conditions, the newly designed setup fulfills the static precision and accuracy requirements of the proposed airborne EC hygrometer.
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