DOI: 10.1002/2017JC012941
Scopus记录号: 2-s2.0-85041584824
论文题名: Influence of Sea Ice Crack Formation on the Spatial Distribution of Nutrients and Microalgae in Flooded Antarctic Multiyear Ice
作者: Nomura D. ; Aoki S. ; Simizu D. ; Iida T.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 2 起始页码: 939
结束页码: 951
语种: 英语
英文关键词: algae
; biogeochemical cycles
; crack
; nutrient
; sea ice
; Southern Ocean
Scopus关键词: alga
; algal bloom
; biogeochemical cycle
; biological production
; crack
; meltwater
; microalga
; nutrient dynamics
; oxygen isotope ratio
; salinity
; sea ice
; snow
; snow accumulation
; spatial distribution
; tidal cycle
; Antarctica
; Southern Ocean
; algae
英文摘要: Cracks are common and natural features of sea ice formed in the polar oceans. In this study, a sea ice crack in flooded, multiyear, land-fast Antarctic sea ice was examined to assess its influence on biological productivity and the transport of nutrients and microalgae into the upper layers of neighboring sea ice. The water inside the crack and the surrounding host ice were characterized by a strong discoloration (brown color), an indicator of a massive algal bloom. Salinity and oxygen isotopic ratio measurements indicated that 64–84% of the crack water consisted of snow meltwater supplied during the melt season. Measurements of nutrient and chlorophyll a concentrations within the slush layer pool (the flooded layer at the snow-ice interface) revealed the intrusion of water from the crack, likely forced by mixing with underlying seawater during the tidal cycle. Our results suggest that sea ice crack formation provides conditions favorable for algal blooms by directly exposing the crack water to sunlight and supplying nutrients from the under-ice water. Subsequently, constituents of the crack water modified by biological activity were transported into the upper layer of the flooded sea ice. They were then preserved in the multiyear ice column formed by upward growth of sea ice caused by snow ice formation in areas of significant snow accumulation. © 2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114522
Appears in Collections: 气候减缓与适应
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作者单位: Institute of Low Temperature Science, Hokkaido University, Sapporo, Japan; National Institute of Polar Research, Tachikawa, Japan; Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Japan; Arctic Research Center, Hokkaido University, Sapporo, Japan
Recommended Citation:
Nomura D.,Aoki S.,Simizu D.,et al. Influence of Sea Ice Crack Formation on the Spatial Distribution of Nutrients and Microalgae in Flooded Antarctic Multiyear Ice[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(2)