光ファイバー分光器を用いた海中光環境の測定(2004年度神奈川大学総合理学研究所共同研究助成論文)

• Main Authors: 柴田 達矢, Shibata Tatsuya, 北島 正治, Kitashima Masaharu, 鈴木 祥弘, Suzuki Yoshihiro
• Format: Report
• Language: Japanese
• Published: 神奈川大学 2005
• Subjects: fiber optics spectrophotometer; light condition; spectrum; sea ice; photon flux density; Sea ice
• Online Access: http://hdl.handle.net/10487/1424; https://kanagawa-u.repo.nii.ac.jp/?action=repository_uri&item_id=6902; https://kanagawa-u.repo.nii.ac.jp/?action=repository_action_common_download&item_id=6902&item_no=1&attribute_id=18&file_no=1

A fiber optics spectrophotometer (USB2000, OceanOptics, USA) was applied to measure light conditions under sea ice at Saroma-ko Lagoon, Hokkaido Japan, in February and March 2005. One end of a 10 m quartz fiber optics (QP200-2-UV-VIS, OceanOptics, USA) fixed under sea ice led light to the other end, and the spectrophotometer determined the spectrum of the light at the other end on the sea ice. Signals from the spectrophotometer were normalized with the calibration light source (DH2000CAL, OceanOptics, USA) and a program (OOIBase, OOIIrad, OceanOptics, USA) and were determined as irradiance (w m^<-2> mn^<-1>). Without the cosine-collector for collecting the light from 180 degrees in front, the fiber optics collected light from a narrow range and showed quite different spectrums from those determined with the cosine-collector. Spectrums with a peak at 570 nm were determined with the cosine-collector and corresponded well with the spectrums often determined at near coastal areas. Photon flux densities (μmol photons s^<-1>m^<-2> nm^<-1>) were estimated from spectrums determined with the cosine-collector and correlated well (R^2=0.98) with those determined with the quantum sensor (LI-193, LI-COR, USA). These results showed that fiber optics spectrophotometer could determine the light conditions under sea ice both qualitatively and quantitatively.