Open AccessReal‐time monitoring of carbon dioxide emissions from a shallow carbon dioxide release experiment
Author(s) -
Kim HyunJun,
Han Seung Hyun,
Kim Seongjun,
Ko Daegeun,
Yun SeongTaek,
Son Yowhan
Publication year - 2020
Publication title -
vadose zone journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.036
H-Index - 81
ISSN - 1539-1663
DOI - 10.1002/vzj2.20051
Subject(s) - carbon dioxide , relative humidity , flux (metallurgy) , humidity , environmental science , soil science , water content , permeability (electromagnetism) , atmospheric pressure , atmospheric sciences , moisture , soil respiration , soil water , environmental chemistry , hydrology (agriculture) , chemistry , materials science , geology , meteorology , composite material , membrane , geotechnical engineering , biochemistry , physics , oceanography , organic chemistry
This study was conducted to analyze CO 2 migration from a shallow CO 2 release experiment using a continuous soil CO 2 flux measurement system. Approximately 1.8 t CO 2 was injected from 1 to 30 June 2016 through the point sources with perforated release wells laid at 2.5‐m soil depth. Using LI‐8100A instruments, CO 2 concentration, CO 2 flux, soil temperature, soil moisture, relative humidity, and atmospheric pressure were continuously measured every 30 min at 0, 1.5, 3.0, 4.5, and 6.0 m from the well from 29 May to 4 August 2016. Typically sensors for soil temperature and moisture were installed at 5‐cm depth, and CO 2 concentration, relative humidity, and atmospheric pressure were measured at the chambers. The CO 2 flux was not maximum directly above the release well. Carbon dioxide flux at 6.0 m from the well was similar to the background level. The relationship between CO 2 flux and environmental factors, described using a temporal correlation analysis, indicated that CO 2 flux was primarily driven by soil temperature and had the inverse correlation with relative humidity and atmospheric pressure. Heavy rainfall inhibited in‐soil CO 2 migration by filling the soil pore with water. The anomalously high CO 2 flux detected at 1.5 m from the well may have been caused by the associated permeability structure, in which a permeability discrepancy leads to the vertical or horizontal flow of in‐soil CO 2 . These findings from this shallow CO 2 release experiment should be considered as basic information to characterize and model the in‐soil CO 2 transport related to CO 2 leakage.