Linking deep convection and phytoplankton blooms in the northern Labrador Sea in a changing climate
Doney, Scott C.
Rasch, Philip J.
Leung, L. Ruby
Lima, Ivan D.
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Wintertime convective mixing plays a pivotal role in the sub-polar North Atlantic spring phytoplankton blooms by favoring phytoplankton survival in the competition between light-dependent production and losses due to grazing and gravitational settling. We use satellite and ocean reanalyses to show that the area-averaged maximum winter mixed layer depth is positively correlated with April chlorophyll concentration in the northern Labrador Sea. A simple theoretical framework is developed to understand the relative roles of winter/spring convection and gravitational sedimentation in spring blooms in this region. Combining climate model simulations that project a weakening of wintertime Labrador Sea convection from Arctic sea ice melt with our framework suggests a potentially significant reduction in the initial fall phytoplankton population that survive the winter to seed the region’s spring bloom by the end of the 21st century.
© The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in PLoS One 13 (2018): e0191509, doi:10.1371/journal.pone.0191509.
Suggested CitationArticle: Balaguru, Karthik, Doney, Scott C., Bianucci, Laura, Rasch, Philip J., Leung, L. Ruby, Yoon, Jin-Ho, Lima, Ivan D., "Linking deep convection and phytoplankton blooms in the northern Labrador Sea in a changing climate", PLoS One 13 (2018): e0191509, DOI:10.1371/journal.pone.0191509, https://hdl.handle.net/1912/9516
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