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Using under-ice hyperspectral transmittance to determine land-fast sea-ice algal biomass in Saroma-ko Lagoon, Hokkaido, Japan

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Title: Using under-ice hyperspectral transmittance to determine land-fast sea-ice algal biomass in Saroma-ko Lagoon, Hokkaido, Japan
Authors: Wongpan, Pat Browse this author
Nomura, Daiki Browse this author
Toyota, Takenobu Browse this author
Tanikawa, Tomonori Browse this author
Meiners, Klaus M. Browse this author
Ishino, Tomomi Browse this author
Tamura, Tetsuya P. Browse this author
Tozawa, Manami Browse this author
Nosaka, Yuichi Browse this author
Hirawake, Toru Browse this author
Ooki, Atsushi Browse this author
Aoki, Shigeru Browse this author →KAKEN DB
Keywords: Biogeochemistry
sea ice
sea-ice ecology
Issue Date: 1-Dec-2020
Publisher: Cambridge University Press
Journal Title: Annals of glaciology
Volume: 61
Issue: 83
Start Page: 454
End Page: 463
Publisher DOI: 10.1017/aog.2020.69
Abstract: Sea ice, which forms in polar and nonpolar areas, transmits light to ice-associated (sympagic) algal communities. To noninvasively study the distribution of sea-ice algae, empirical relations to estimate its biomass from under-ice hyperspectral irradiance have been developed in the Arctic and Antarctica but lack for nonpolar regions. This study examines relationships between normalised difference indices (NDI) calculated from hyperspectral transmittance and sympagic algal biomass in the nonpolar Saroma-ko Lagoon. We analysed physico-biogeochemical properties of snow and land-fast sea ice supporting 27 paired bio-optical measurements along three transects covering an area of over 250 m x 250 m in February 2019. Snow depth (0.08 +/- 0.01 m) and ice-bottom brine volume fraction (0.21 +/- 0.02) showed low (0.06) and high (0.58) correlations with sea-ice core bottom section chlorophyll a (Chl. a), respectively. Spatial analyses unveiled the patch size of sea-ice Chl. a to be similar to 65 m, which is in the same range reported from previous studies. A selected NDI (669, 596 nm) explained 63% of algal biomass variability. This reflects the bio-optical properties and environmental conditions of the lagoon that favour the wavelength pair in the orange/red part of the spectrum and suggests the necessity of a specific bio-optical relationship for Saroma-ko Lagoon.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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