Potential increasing dominance of heterotrophy in the global ocean

Video in TIB AV-Portal: Potential increasing dominance of heterotrophy in the global ocean

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Title
Potential increasing dominance of heterotrophy in the global ocean
Title of Series
Author
Kvale, Karin F.
Meissner, Katrin J.
Keller, David P.
License
CC Attribution 3.0 Unported:
You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
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Publisher
Institute of Physics (IOP)
Release Date
2015
Language
English

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Abstract
Autotrophy is largely resource-limited in the modern ocean. Paleo evidence indicates this was not necessarily the case in warmer climates, and modern observations as well as standard metabolic theory suggest continued ocean warming could shift global ecology towards heterotrophy, thereby reducing autotrophic nutrient limitation. Such a shift would entail strong nutrient recycling in the upper ocean and high rates of net primary production (NPP), yet low carbon export to the deep ocean and sediments. We demonstrate transition towards such a state in the early 22nd century as a response to business-as-usual representative concentration pathway forcing (RCP8.5) in an intermediate complexity Earth system model in three configurations; with and without an explicit calcifier phytoplankton class and calcite ballast model. In all models nutrient regeneration in the near-surface becomes an increasingly important driver of primary production. The near-linear relationship between changes in NPP and global sea surface temperature (SST) found over the 21st century becomes exponential above a 2–4 global mean SST change. This transition to a more heterotrophic ocean agrees roughly with metabolic theory.

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I don't think it is projected to produce letter again the carrier and the ocean temperatures rise where the surface waters warming the
density gravity more and more of the police and let me think a place
it lets water from deep reagent that here in between and are available for phytoplankton in primary production
decreases this is what many model calculations shall we cannot find a real and name suggests that the function might be misleading the
10 devotion to primary production going down due to climate change in the culture of the next 100 years but we look beyond that period are model suggests that notion production increases and now that the 80 changed back to the production of it was before we added a lot of carbon dioxide this is a shift to a fundamentally different type of production
we integrated a 600 year simulations using in the complexity of
the model starting in the year hundred
before the Industrial Revolution in this way we were able to cover historical carbon dioxide emissions and the business as usual in the area of the how the ocean biology on with 3 slightly
different model version when we look past the next 100 years the primary production start to increase and not just a little bit it increases by a lot and that so we have y and it's the difference between production and breakdown rate or respiration rate that driving the increase in primary production in our model we analyze
how the ratio of primary production to respiration changes with time
of the english model version shows
a slightly differently bonds but the main Japan and all of which is that over the 1st 200 years then the ratio between primary production and respiration rate changes very little but then darting about the year 2000 we start to see a decline in spatial and that's because the operation they are picking up last year because they're more sensitive to increase picture looking at the next 100 years
and on into the future we see this ratio continues to decline
eventually the unbalanced ratio pushes primary production out of a
regime that regulated mostly by physical limitations like to
light temperature and nutrient and go into a new regime
that dominated basically by the biology now is a new regime is
different from the 1 we're in now and that the nutrient the recycled very quickly in the surface ocean and how deep ocean chemistry changes and we don't the carbon being exploited at effectively and that is not about a
certain temperature threshold model that they become a lot less relevant to the energy industry and the biological model becomes a lot more likewise the eventual real world primary production response to large increases in anthropogenic and carbon-dioxide emissions is going to depend largely on psychology and that's where the temperature of
that and whether it can be classified to tipping point is better addressed using a more complex model or their model than what we use if a tipping point is identified and you really can move the ocean into a state that dominated more by respiration then the question I would have is what happens to our global fisheries another question will be held in this threshold compared to other climate guardrails touches the 2 degree temperature currently I think that Reddy Green of Harvard questions and in the
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AV-Portal 3.12.0 (3a2599d676b25753609baac9def5622401886a53)
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