Open AccessIsotopic composition of carbon in atmospheric air; use of a diffusion model at the water/atmosphere interface in Velenje Basin
Author(s) -
Tjaša Kanduč
Publication year - 2015
Publication title -
geologija
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.187
H-Index - 7
eISSN - 1854-620X
pISSN - 0016-7789
DOI - 10.5474/geologija.2015.002
Subject(s) - atmosphere (unit) , biogeochemical cycle , carbon dioxide , environmental science , dissolved organic carbon , carbon fibers , environmental chemistry , relative humidity , isotopes of carbon , humidity , atmospheric sciences , dissolution , total organic carbon , hydrology (agriculture) , chemistry , geology , materials science , meteorology , geography , composite number , composite material , geotechnical engineering , organic chemistry
CO2 concentrations (partial pressure of CO2, pCO2), and isotope compositions of carbon dioxide in air (δ13CCO2),\udtemperature (T) and relative humidity (H) have been measured in the atmosphere in the Velenje Basin. Samples\udwere collected monthly in the calendar year 2011 from 9 locations in the area where the largest thermal power\udplant in Slovenia with the greatest emission of CO2 to the atmosphere (around 4M t/year) is located. Values of\udpCO2 ranged from 239 to 460 ppm with an average value of 294 ppm, which is below the average atmospheric\udCO2 pressure (360 ppm). δ13CCO2 ranged from -18.0 to -6.4 ‰, with an average value of -11.7 ‰. These values are\udsimilar to those measured in Wroclaw, Poland. We performed the comparison of δ13CCO2 values in atmospheric air\udwith Wroclaw since researchers used similar approach to trace δ13CCO2 around anthropogenic sources. The isotopic\udcomposition of dissolved inorganic carbon (δ13CDIC) in rivers and lakes from the Velenje basin changes seasonally\udfrom -13.5 to -7.1‰. The values of δ13CDIC indicate the occurrence of biogeochemical processes in the surface waters,\udwith dissolution of carbonates and degradation of organic matter being the most important. A concentration and\uddiffusion model was used to calculate the time of equilibration between dissolved inorganic carbon in natural\udsources (rivers) and atmospheric CO2