Long-term trends in ocean plankton production and particle export between 1960-2006

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Author(s) Laufkotter, Charlotte, Vogt, Meike, Gruber, Nicolas
Publication Type Journal Items, Publication Status: Published
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Title Long-term trends in ocean plankton production and particle export between 1960-2006
Author(s) Laufkotter, Charlotte
Vogt, Meike
Gruber, Nicolas
Journal or Series Title Biogeosciences
Volume Number 10
Issue Number 11
Start Page 7373
End Page 7393
ISSN 1726-4170
Publisher Copernicus
Publication Place Katlenburg-Lindau
Publication Date 2013-11
Abstract We analyse long-term trends in marine primary and particle export production and their link to marine phytoplankton community composition for the period 1960–2006 using a hindcast simulation of the Biogeochemical Elemental Cycling Model coupled to the ocean component of the Community Climate System Model. In our simulation, global primary and export production decrease significantly over the last 50 yr, by 6.5% and 8% respectively. These changes are associated with an 8.5% decrease in small phytoplankton biomass and 5% decrease in zooplankton biomass. Diatom biomass decreases globally by 3%, but with strong temporal and spatial variability. The strongest decreases in primary and export production occur in the western Pacific, where enhanced stratification leads to stronger nutrient limitation and a decrease in total phytoplankton. The concurrent decrease in diatom fraction and in zooplankton biomass causes a lower export efficiency in this region. Substantial phytoplankton composition changes also occur in the Southern Ocean and North Atlantic, although these are masked in part by a high degree of interannual variability. In these regions, stronger wind stress enhances mixing, reducing the biomass of small phytoplankton, while diatoms profit from higher nutrient inputs and lower grazing pressure. The relative fraction of diatoms correlates positively with the export efficiency (r = 0.8, p < 0.05) in most areas except for the North Pacific and Antarctic Circumpolar Current, where the correlation is negative (r = –0.5, p < 0.05). However, the long-term trends in global export efficiency are ultimately driven by the reduction in small phytoplankton and particularly decreases in coccolithophore biomass. The diagnosed trends point toward a substantial sensitivity of marine primary production and export to climatic variations and trends.
DOI 10.5194/bg-10-7373-2013
Additional Notes Received 22 December 2012, Published in Biogeosciences Discuss. 27 March 2013, Revised 23 August 2013, Accepted 13 October 2013, Published 18 November 2013
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03731
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NEBIS System Number 006289717
Source Database ID FORM-1385018902
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  author = "Laufkotter, Charlotte and Vogt, Meike and Gruber, Nicolas",
  title = "{L}ong-term trends in ocean plankton production and particle export between 1960-2006",
  journal = "Biogeosciences",
  year = 2013,
  volume = "10",
  number = "11",
  pages = "7373--7393",
  month = nov,

E-Citations record created: Thu, 21 Nov 2013, 07:28:25 CET