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

Wongpan, Pat; Nomura, Daiki; Toyota, Takenobu; Tanikawa, Tomonori; Meiners, Klaus M.; Ishino, Tomomi; Tamura, Tetsuya P.; Tozawa, Manami; Nosaka, Yuichi; Hirawake, Toru; Ooki, Atsushi; Aoki, Shigeru

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

Wongpan, Pat; Nomura, Daiki; Toyota, Takenobu et al.

Annals of glaciology, 2020, 61(83), 454-463

Permalink : https://hdl.handle.net/2115/82195

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アクセス権	open access
URI	https://hdl.handle.net/2115/82195
タイトル	Using under-ice hyperspectral transmittance to determine land-fast sea-ice algal biomass in Saroma-ko Lagoon, Hokkaido, Japan
著者	Wongpan, Pat ; Nomura, Daiki ; Toyota, Takenobu ; Tanikawa, Tomonori ; Meiners, Klaus M. ; Ishino, Tomomi ; Tamura, Tetsuya P. ; Tozawa, Manami ; Nosaka, Yuichi ; Hirawake, Toru ; Ooki, Atsushi ; Aoki, Shigeru
著者名 Wongpan, Pat
著者名 Nomura, Daiki
著者名 Toyota, Takenobu
著者名 Tanikawa, Tomonori
著者名 Meiners, Klaus M.
著者名 Ishino, Tomomi
著者名 Tamura, Tetsuya P.
著者名 Tozawa, Manami
著者名 Nosaka, Yuichi
著者名 Hirawake, Toru
著者名 Ooki, Atsushi
e-Rad_Researcher 80281583 著者名 Aoki, Shigeru
言語	英語
キーワード	Biogeochemistry
	sea ice
	sea-ice ecology
発行日	2020-12-01
出版者	Cambridge University Press
収録物名	Annals of glaciology
巻(号)	61(83)
ページ	454-463
抄録	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.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	Creative Commons Attribution 4.0 International
PISSN	0260-3055
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1017/aog.2020.69