DOI: 10.1002/2017JC013263
Scopus记录号: 2-s2.0-85041581417
论文题名: Extreme Low Light Requirement for Algae Growth Underneath Sea Ice: A Case Study From Station Nord, NE Greenland
作者: Hancke K. ; Lund-Hansen L.C. ; Lamare M.L. ; Højlund Pedersen S. ; King M.D. ; Andersen P. ; Sorrell B.K.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 2 起始页码: 985
结束页码: 1000
语种: 英语
英文关键词: Arctic
; Greenland
; ice algae
; light
; sea ice
; snow
Scopus关键词: food web
; ice alga
; ice thickness
; light attenuation
; microalga
; sea ice
; snow cover
; solar radiation
; temperature effect
; Arctic
; Arctic Ocean
; Greenland
; algae
英文摘要: Microalgae colonizing the underside of sea ice in spring are a key component of the Arctic foodweb as they drive early primary production and transport of carbon from the atmosphere to the ocean interior. Onset of the spring bloom of ice algae is typically limited by the availability of light, and the current consensus is that a few tens-of-centimeters of snow is enough to prevent sufficient solar radiation to reach underneath the sea ice. We challenge this consensus, and investigated the onset and the light requirement of an ice algae spring bloom, and the importance of snow optical properties for light penetration. Colonization by ice algae began in May under >1 m of first-year sea ice with ∼1 m thick snow cover on top, in NE Greenland. The initial growth of ice algae began at extremely low irradiance (<0.17 μmol photons m−2 s−1) and was documented as an increase in Chlorophyll a concentration, an increase in algal cell number, and a viable photosynthetic activity. Snow thickness changed little during May (from 110 to 91 cm), however the snow temperature increased steadily, as observed from automated high-frequency temperature profiles. We propose that changes in snow optical properties, caused by temperature-driven snow metamorphosis, was the primary driver for allowing sufficient light to penetrate through the thick snow and initiate algae growth below the sea ice. This was supported by radiative-transfer modeling of light attenuation. Implications are an earlier productivity by ice algae in Arctic sea ice than recognized previously. © 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/114484
Appears in Collections: 气候减缓与适应
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作者单位: Department of Bioscience, Aquatic Biology, Aarhus University, Aarhus, Denmark; Norwegian Institute for Water Research (NIVA), Research Centre for Coast and Ocean, Oslo, Norway; Department of Bioscience, Arctic Research Centre, Aarhus University, Aarhus, Denmark; Department of Earth Sciences, Royal Holloway University of LondonSurrey, United Kingdom; Department of Biological Sciences, University of Alaska Anchorage, Anchorage, AK, United States; NIRAS, Ceres Allé 3, Aarhus, Denmark
Recommended Citation:
Hancke K.,Lund-Hansen L.C.,Lamare M.L.,et al. Extreme Low Light Requirement for Algae Growth Underneath Sea Ice: A Case Study From Station Nord, NE Greenland[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(2)