Extending water vapor measurement capability of photon-limited differential absorption lidars through simultaneous denoising and inversion
نویسندگان
چکیده
Abstract. The micropulse differential absorption lidar (MPD) was developed at Montana State University (MSU) and the National Center for Atmospheric Research (NCAR) to perform range-resolved water vapor (WV) measurements using low-power lasers photon-counting detectors. MPD has proven produce accurate WV up 6 km altitude. However, MPD's ability higher-altitude is impeded by current standard (DIAL) retrieval methods. These methods are built upon a fundamental methodology that algebraically solves forward models noisy observations, which exacerbates any random noise in observations. work this paper introduces adapted Poisson total variation (PTV) specifically instrument. PTV originally ground-based high spectral resolution lidar, reports on adaptations were required order apply method, coined PTV-MPD, extends maximum altitude of from 8 substantially increases accuracy retrievals starting above 2 km. PTV-MPD achieves improvement simultaneously denoising observations inferring separating non-random WV. An analysis with 130 radiosonde (RS) comparisons shows relative root-mean-square difference (RRMSE) between RS exceeds 100 % km, whereas RRMSE method near 3 In addition, we show employing able extend its useful range estimates beyond ARM Southern Great Plains Raman (RRMSE exceeding 4 km); power-aperture product 500 times greater than MPD.
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ژورنال
عنوان ژورنال: Atmospheric Measurement Techniques
سال: 2022
ISSN: ['1867-1381', '1867-8548']
DOI: https://doi.org/10.5194/amt-15-5159-2022