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In situ measurement of chlorophyll a specific absorption coefficient in the sea(International symposium on Ocean Color Remote Sensing and Carbon Flux) 

作成者 Kobara, S., Kishino, M., Taguchi, S.
日本十進分類法 (NDC) 450
内容 研究概要:The total absorption coefficient is important in determining the magnitude and the spectral shape of the light field in an aquatic medium. Furthermore, accurate estimates of phytoplankton absorption are necessary to determine the chlorophyll a specific absorption coefficient, which is central to the bio-optical model for primary production. However, the presence of detrital and dissolved matter in seawater complicates the direct measurement of phytoplankton absorption coefficient in the sea. The most widely used method for determining absorption coefficient is the quantitative filter technique (QFT). It can be used to determine the chlorophyll a specific absorption coefficient. However, these provide the information at discrete depths only. In recent years, reflective-tube absorption and attenuation meter (ac-9: Wetlabs) and fluorometer (WETStar: Wetlabs) have been developed and provide the continuous vertical profiles of in situ absorption, attenuation, and fluorescence. The present study is aimed to estimate the vertical profile of chlorophyll a specific absorption coefficient using an in situ method that was tested against QFT method. Data were collected in Sagami Bay from April to July 1999. The particulate absorption coefficient using in situ method were obtained by subtracting the absorption of dissolved organic matter determined with a 0.2μm filter placed at the intake port of ac-9 from the total absorption coefficient using in situ method. In the present study we chose to use absorption at 676nm to estimate phytoplankton absoiption in situ due to negligible contribution by detrital absorption to particulate absorption at 676nm. In vivo bottle samples were taken from Niskin bottle casts at discrete depths. Seawater samples were filtered through Whatman GF/F glass-fiber filters for analysis of chlorophyll a concentrations with fluorometric method after extraction in DMF. The continuous profile of chlorophyll a, matched well with those collecte
コンテンツの種類 研究報告書 Research Paper
DCMI資源タイプ text
ファイル形式 application/pdf
ハンドルURL http://mitizane.ll.chiba-u.jp/meta-bin/mt-pdetail.cgi?cd=00022461
掲載誌情報 Proceedings of the international symposium on Ocean Color Remote Sensing and Carbon Flux page.36-37 (1999)
フルテキストへのリンク http://mitizane.ll.chiba-u.jp/metadb/up/assist1/C-25_12.pdf
言語 英語


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