CICLI BIOGEOCHIMICI PDF

Ocean Tracer and Biogeochemical Modeling at MIT. Here we briefly describe some of our ocean tracer and biogeochemistry studies. Bio, Cicli Biogeochimici. Prof Berna; 3 videos; views; Last updated on Sep 27, Play all. Share. Loading Save. Rappresentazione schematica del ciclo dell’azoto. Si chiama nitratazione la reazione terminale di mineralizzazione dell’azoto nel suolo e consiste Categoria: Cicli biogeochimici.

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The figure shows the mean surface ocean chlorophyll concentration in the Atlantic basin image from the SeaWiFs website. With graduate student Galen Mckinley, using global ocean circulation estimates from the ECCO consortium we find a significant interannual variability of the air-sea exchange of carbon dioxide of similar magnitude to those estimated from observed atmospheric data related to changes in upper ocean mixing.

The figure shows the time-mean air-sea flux of carbon dioxide from a global, interannually varying simulation made by Galen McKinley. Monthly images are sequenced, for the two years and We have also used a numerical model of the time dependent ocean circulation with a highly simplified representation of the ecosystem of the North Atlantic. We have examined chlorophyll distributions estimated from remotely sensed ocean color by the SeaWiFs mission.

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The ocean model absorbs carbon from the atmosphere in regions of sea biogeochimixi heat loss and biological uptake of carbon e. The comparison shows an improved simulation in models which partially resolve mesoscale eddies – the oceanic equivalent of weather systems which are typically boigeochimici of kilometres in lateral scale.

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What is the role of ocean circulation and its variability in controlling and modulating global biogeochemical cycles? The subtropics are depleted in nutrients year round, reflected in low chlorophyll concentrations dark blue. Comparisons show significant differences between models and data, and between the different models.

How do changes in ocean circulation and mixing on interannual timescales affect the air-sea exchange of trace gases, such as carbon dioxide and oxygen?

An animation, showing the seasonal and interannual variability of the North Atlantic spring bloom, as observed from space by SeaWiFS, can be seen here 1. Follows and Dutkiewicz The ocean model is losing carbon dioxide from the ocean in regions where carbon rich deep waters upwell to the surface e.

These studies are described in a series of papers click link to download PDF’s: From Follows and Marshall ; read the abstract here.

It is soluble and has been invading the oceans, marking waters which have recently been near the surface. The high concentrations in the subpolar gyre reflect the strong late spring and summer bloom in that region.

Yellow and light blue indicate high chlorophyll concentrations. Ocean distributions of anthropogenic transient tracers, such as chlorofluorocarbons CFCs and biogeoochimici 14C reveal pathways, rates and mechanisms of ocean circulation and mixing. You can find pre-prints, reprints and abstracts of of our papers on these topics here.

We have studied the intensity of the bloom in the subtropical and subpolar North Atlantic, and its relationship to meteorological forcing, using analysis of the SeaWiFS cjcli and numerical models.

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We use numerical models of ocean circulation and biogeochemistry to examine the possible effect of interannual changes in meteorological forcing and upper ocean circulation on the fluxes of carbon dioxide and oxygen between the ocean and atmosphere. We have examined model simulations of the penetration of bomb-radiocarbon the 14C perturbation viogeochimici atmospheric nuclear tests in the ‘s into the ocean.

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Comparing model simulations of ocean tracers with observed data can inform us about the veracity of our ocean circulation models. What are the feedbacks biogeeochimici climate and biogeochemical processes?

The finer resolution model shows significant ventilation of the western subtropical thermocline due to mesoscale eddy stirring. CFC is entirely man-made, and its concentration in the atmosphere increased rapidly from the s to the s. We have examined the relationships between regionanal and interannual variations in meteorological forcing and the variability of the spring bloom of biological productivity in the North Atlantic ocean.

This project has been a collaboration with Dr. We have participated in OCMIPan international comparison of simulations of the ocean uptake of chlorofluorocarbons and the distribution and air-sea exchange of nutrients, carbon and oxygen in the ocean.

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Interannual variability in the global flux of carbon dioxide across the model’s sea surface show general agreement with inferences from observed data showing a strong signature of changes in biogeocuimici Tropical Pacific associated with El Nino phenomenon. Here we briefly describe some of our ocean tracer and biogeochemistry studies. Our overarching aim is to better understand the interactions between the climate system and the global carbon cycle.