@article{oai:repository.naro.go.jp:00001562,
 author = {小南, 靖弘 and KOMINAMI, Yasuhiro},
 journal = {中央農業総合研究センター研究報告, Bulletin of the National Agricultural Research Center},
 month = {Mar},
 note = {The CO_2 concentration in the air on the soil surface boundary under the snow cover was measured over four winter seasons from 1991 - 1994 to analyze its behaviors under natural conditions and to determine the quantitatively processes involved in CO_2 transfer under the snow cover. We developed an instrument to evaluate the gas diffusion coefficient of the snow layer based on the non-steady -state gas diffusion theory. To examine the performance of this instrument and to validate the related assumptions, we supplied the indtrument with glass beads and a bundle of glass tubes. The diffusion coefficient thus measured agreed closely with those calculated theoretically from the geometrical features of the glass beads and tubes. By using the instrument, we determined the CO_2 diffusion coefficient through several forms of snow piles; each different in age and in weather exposure. The forms were classified into 1） newly fallen snow, 2） granular snow and 3） compacted snow. The deposit had a wide range of snow forms. The diffusion coefficients obtained were proportional to the porosity of the snow. To determine another component of the coefficient induced by outdoor wind turbulence（hereafter, the turbulent coefficient）, we measured the CO_2 flux above the snow cover and the CO_2 concentration difference between the atmosphere and the air at the bottom of snow cover. The turbulent coefficient thus obtained was well expressed as a function of wind speed and snow depth. A factor was introduced to determine the process of CO_2 dissipation from the snow pile by CO_2 dissolution in melted water. The factor was obtained from the measurement of soluble CO_2 concentration in melted water and the CO_2 concentration of the air at the bottom of snow cover. These processes were incorporated into a mathematical model to simulate the CO_2 exchange between soil, snow and atmosphere. The model used atmospheric CO_2 concentration, snow depth, snow load, the flow rate of melted water, wind speed and the source intensity of CO_2 emission from underlying soil as inputs. The simulated results were well agreed with those observed in the CO_2 concentration under the snow cover.},
 pages = {15--49},
 title = {暖地積雪地帯における積雪下のCO_2濃度に関する研究},
 volume = {6},
 year = {2005},
 yomi = {コミナミ, ヤスヒロ}
}