DOI: 10.1038/NGEO3035
论文题名: Unexpected winter phytoplankton blooms in the North Atlantic subpolar gyre
作者: Lacour L. ; Ardyna M. ; Stec K.F. ; Claustre H. ; Prieur L. ; Poteau A. ; Ribera D'Alcala M. ; Iudicone D.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 11 起始页码: 836
结束页码: 839
语种: 英语
Scopus关键词: algal bloom
; community dynamics
; diatom
; growth rate
; gyre
; light effect
; nanoplankton
; phytoplankton
; picoplankton
; turbulent mixing
; winter
; Atlantic Ocean
; Atlantic Ocean (North)
; Bacillariophyta
英文摘要: In mid- and high-latitude oceans, winter surface cooling and strong winds drive turbulent mixing that carries phytoplankton to depths of several hundred metres, well below the sunlit layer. This downward mixing, in combination with low solar radiation, drastically limits phytoplankton growth during the winter, especially that of the diatoms and other species that are involved in seeding the spring bloom. Here we present observational evidence for widespread winter phytoplankton blooms in a large part of the North Atlantic subpolar gyre from autonomous profiling floats equipped with biogeochemical sensors. These blooms were triggered by intermittent restratification of the mixed layer when mixed-layer eddies led to a horizontal transport of lighter water over denser layers. Combining a bio-optical index with complementary chemotaxonomic and modelling approaches, we show that these restratification events increase phytoplankton residence time in the sunlight zone, resulting in greater light interception and the emergence of winter blooms. Restratification also caused a phytoplankton community shift from pico- and nanophytoplankton to phototrophic diatoms. We conclude that transient winter blooms can maintain active diatom populations throughout the winter months, directly seeding the spring bloom and potentially making a significant contribution to over-winter carbon export. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105679
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Sorbonne Universités, UPMC Univ Paris 06, CNRS, Laboratoire D'Océanographie de Villefranche (LOV), Observatoire Océanologique, Villefranche-sur-Mer, France; Laboratory of Ecology and Evolution of Plankton, Stazione Zoologica Anton Dohrn, Naples, Italy
Recommended Citation:
Lacour L.,Ardyna M.,Stec K.F.,et al. Unexpected winter phytoplankton blooms in the North Atlantic subpolar gyre[J]. Nature Geoscience,2017-01-01,10(11)