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Technical note: Assessing gas equilibration systems for continuous pCO(2) measurements in inland waters

Title
Technical note: Assessing gas equilibration systems for continuous pCO(2) measurements in inland waters
Authors
Yoon, Tae KyungJin, HyojinOh, Neung-HwanPark, Ji-Hyung
Ewha Authors
박지형
SCOPUS Author ID
박지형scopus
Issue Date
2016
Journal Title
BIOGEOSCIENCES
ISSN
1726-4170JCR Link1726-4189JCR Link
Citation
vol. 13, no. 13, pp. 3915 - 3930
Publisher
COPERNICUS GESELLSCHAFT MBH
Indexed
SCIE; SCOPUS WOS scopus
Abstract
High-frequency continuous measurements of the partial pressure of CO2 (pCO(2)) are crucial for constraining the spatiotemporal dynamics of CO2 emissions from inland water systems. However, direct measurements of pCO(2) are scarce, and no systematic comparisons have been conducted on the suitability of the widely used measurement systems for continuous underway or long-term deployment in various field conditions. We compared spray-and marble-type equilibrators and a membrane-enclosed CO2 sensor to assess their suitability for continuous long-term or underway pCO(2) measurements in an urbanized river system in Korea. Both equilibrators had a shorter response time compared with the membrane-enclosed sensor, and could capture large spatial variations of pCO(2) during a transect study along a highly urbanized river reach. The membrane-enclosed sensor based on passive equilibration provided comparable underway measurements along the river sections where pCO(2) varied within the sensor detection range. When deployed in a eutrophic river site, the membrane-enclosed sensor was able to detect large diel variations in pCO(2). However, biofouling on the membrane could reduce the accuracy of the measurement during long deployments exceeding several days. The overall results suggest that the fast response of the equilibrator systems facilitates capturing large spatial variations in pCO(2) during short underway measurements. However, the attendant technical challenges of these systems, such as clogging and desiccant maintenance, have to be addressed carefully to enable their long-term deployment. The membrane-enclosed sensor would be suitable as an alternative tool for long-term continuous measurements if membrane biofouling could be overcome by appropriate antifouling measures such as copper mesh coverings.
DOI
10.5194/bg-13-3915-2016
Appears in Collections:
엘텍공과대학 > 환경공학전공 > Journal papers
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