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Dynamic biological functioning important for simulating and stabilizing ocean biogeochemistry


Buchanan, PJ and Matear, RJ and Chase, Z and Phipps, SJ and Bindoff, NL, Dynamic biological functioning important for simulating and stabilizing ocean biogeochemistry, Global Biogeochemical Cycles, 32, (4) pp. 565-593. ISSN 0886-6236 (2018) [Refereed Article]

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Copyright Statement

Copyright 2018 American Geophysical Union

DOI: doi:10.1002/2017GB005753


The biogeochemistry of the ocean exerts a strong influence on the climate by modulating atmospheric greenhouse gases. In turn, ocean biogeochemistry depends on numerous physical and biological processes that change over space and time. Accurately simulating these processes is fundamental for accurately simulating the ocean's role within the climate. However, our simulation of these processes is often simplistic, despite a growing understanding of underlying biological dynamics. Here we explore how new parameterizations of biological processes affect simulated biogeochemical properties in a global ocean model. We combine 6 different physical realizations with 6 different biogeochemical parameterizations (36 unique ocean states). The biogeochemical parameterizations, all previously published, aim to more accurately represent the response of ocean biology to changing physical conditions. We make three major findings. First, oxygen, carbon, alkalinity, and phosphate fields are more sensitive to changes in the ocean's physical state. Only nitrate is more sensitive to changes in biological processes, and we suggest that assessment protocols for ocean biogeochemical models formally include the marine nitrogen cycle to assess their performance. Second, we show that dynamic variations in the production, remineralization, and stoichiometry of organic matter in response to changing environmental conditions benefit the simulation of ocean biogeochemistry. Third, dynamic biological functioning reduces the sensitivity of biogeochemical properties to physical change. Carbon and nitrogen inventories were 50% and 20% less sensitive to physical changes, respectively, in simulations that incorporated dynamic biological functioning. These results highlight the importance of a dynamic biology for ocean properties and climate.

Item Details

Item Type:Refereed Article
Keywords:nitrate, ocean biogeochemistry, model, nitrogen cycle, carbon cycle, marine ecosystem, phytoplankton, carbon dioxide, climate change
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Chemical oceanography
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Buchanan, PJ (Mr Pearse Buchanan)
UTAS Author:Chase, Z (Professor Zanna Chase)
UTAS Author:Phipps, SJ (Dr Steven Phipps)
UTAS Author:Bindoff, NL (Professor Nathan Bindoff)
ID Code:125440
Year Published:2018
Funding Support:Australian Research Council (FT120100759)
Web of Science® Times Cited:6
Deposited By:Oceans and Cryosphere
Deposited On:2018-04-17
Last Modified:2018-11-26
Downloads:34 View Download Statistics

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