{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,15]],"date-time":"2026-07-15T08:26:57Z","timestamp":1784104017856,"version":"3.55.0"},"reference-count":31,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2021,3,2]],"date-time":"2021-03-02T00:00:00Z","timestamp":1614643200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["21703124"],"award-info":[{"award-number":["21703124"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100007129","name":"Natural Science Foundation of Shandong Province","doi-asserted-by":"publisher","award":["ZR2018BF031"],"award-info":[{"award-number":["ZR2018BF031"]}],"id":[{"id":"10.13039\/501100007129","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100007129","name":"Natural Science Foundation of Shandong Province","doi-asserted-by":"publisher","award":["ZR2018BF032"],"award-info":[{"award-number":["ZR2018BF032"]}],"id":[{"id":"10.13039\/501100007129","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Youth Fund Project of Shandong Academy of Sciences","award":["2020QN006"],"award-info":[{"award-number":["2020QN006"]}]},{"name":"Youth Fund Project of Shandong Academy of Sciences","award":["2019QN0027"],"award-info":[{"award-number":["2019QN0027"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Monitoring of CO2 column concentrations is valuable for atmospheric research. A mobile open-path system was developed based on tunable diode laser absorption spectroscopy (TDLAS) to measure atmospheric CO2 column concentrations. A laser beam was emitted downward from a distributed feedback diode laser at 2 \u03bcm and then reflected by the retroreflector array on the ground. We measured the CO2 column concentrations over the 20 and 110 m long vertical path. Several single-point sensors were distributed at different heights to provide comparative measurements for the open-path TDLAS system. The results showed that the minimum detection limit of system was 0.52 ppm. Some similarities were observed in trends from the open-path TDLAS system and these sensors, but the average of these sensors was more consistent with the open-path TDLAS system values than the single-point measurement. These field measurements demonstrate the feasibility of open-path TDLAS for measuring the CO2 column concentration and monitoring carbon emission over large areas.<\/jats:p>","DOI":"10.3390\/s21051722","type":"journal-article","created":{"date-parts":[[2021,3,2]],"date-time":"2021-03-02T10:36:37Z","timestamp":1614681397000},"page":"1722","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":64,"title":["Measurement of Atmospheric CO2 Column Concentrations Based on Open-Path TDLAS"],"prefix":"10.3390","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0741-8381","authenticated-orcid":false,"given":"Fengxin","family":"Xin","sequence":"first","affiliation":[{"name":"Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Qingdao 266100, China"},{"name":"Ocean Remote Sensing Institute, Ocean University of China, Qingdao 266003, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5865-3440","authenticated-orcid":false,"given":"Jie","family":"Li","sequence":"additional","affiliation":[{"name":"Ocean Remote Sensing Institute, Ocean University of China, Qingdao 266003, China"},{"name":"The First Institute of Oceanography, Ministry of Natural Resources of China, Qingdao 266061, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jinjia","family":"Guo","sequence":"additional","affiliation":[{"name":"Ocean Remote Sensing Institute, Ocean University of China, Qingdao 266003, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dewang","family":"Yang","sequence":"additional","affiliation":[{"name":"Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Qingdao 266100, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yong","family":"Wang","sequence":"additional","affiliation":[{"name":"Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Qingdao 266100, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8839-1859","authenticated-orcid":false,"given":"Qiuhua","family":"Tang","sequence":"additional","affiliation":[{"name":"The First Institute of Oceanography, Ministry of Natural Resources of China, Qingdao 266061, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhishen","family":"Liu","sequence":"additional","affiliation":[{"name":"Ocean Remote Sensing Institute, Ocean University of China, Qingdao 266003, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,3,2]]},"reference":[{"key":"ref_1","first-page":"85","article-title":"Climate Change 2014: Synthesis Report. 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