@article{oai:nipr.repo.nii.ac.jp:00010077,
 author = {Hiwatari, Takehiko and Shirasawa, Kunio and Fukamachi, Yasushi and Nagata, Ryuichi and Koizumi, Tomoyoshi and Koshikawa, Hiroshi and Kohata, Kunio and Hiwatari, Takehiko and Shirasawa, Kunio and Fukamachi, Yasushi and Nagata, Ryuichi and Koizumi, Tomoyoshi and Koshikawa, Hiroshi and Kohata, Kunio},
 issue = {1},
 journal = {Polar science, Polar science},
 month = {Mar},
 note = {Downward material fluxes under seasonal sea ice were measured using a time-series sediment trap installed at an offshore site in the Okhotsk Sea north of Hokkaido, Japan, from 13 January to 23 March 2005. The maximum fluxes of lithogenic material (753 mg m^(-2) day^(-1)) and organic matter (mainly detritus; 333 mg m^(-2) day^(-1)) were recorded during the period in which sea ice drifted ashore and increased in extent, from 13 January to 9 February. Organic matter as fecal pellets (81-93 mg m^(-2) day^(-1)) and opal as biosilica (51-67 mg m^(-2) day^(-1)), representing diatom fluxes, were abundant in sediment trap samples obtained during the period of full sea ice coverage from 10 February to 9 March. Microscopic observations revealed that fecal pellets were largely diatom frustules, suggesting that zooplankton actively grazed on ice algae during the period of full sea ice coverage. During the period of retreating sea ice, from 10 to 23 March, the phytoplankton flux showed a rapid increase (from 9.5 to 22.5 × 10^6 cells m^(-2) day^(-1)), reflecting their release into the water column as the sea ice melted. Our results demonstrate that the quantity and quality of sinking biogenic and lithogenic materials vary with the seasonal extent of sea ice in mid-winter., 季節海氷下の物質の下方沈降フラックスを、オホーツク海においてセジメントトラップを用いて調べました。観測結果は、海氷の季節的消長に伴って、沈降する生物起源・陸域起源物質が量と質を変化させている姿を示しています。特に、顕微鏡観察により、海氷が覆っている期間、動物プランクトンはアイスアルジーを活発に捕食していることが示唆されました。},
 pages = {41--54},
 title = {Vertical material flux under seasonal sea ice in the Okhotsk Sea north of Hokkaido, Japan},
 volume = {2},
 year = {2008}
}