«Combined, the Earth's land and
ocean sinks absorb about half of all carbon dioxide emissions from human activities,» said Paul Fraser of the Commonwealth Scientific and Industrial Research Organization.
Not exact matches
The first is that our planet's
oceans act as a massive watery heat -
sink, and currently
absorb more than 90 percent of increased atmospheric heat that are associated with human activity.
Here, the
ocean - carbon
sink has increased,
absorbing more carbon dioxide.
Particles will float to shore, drift out to the
ocean or
absorb chemicals from the water, which weigh the particles down and cause them to
sink to the bottom of the lakes.
During the last century or so, over half of the CO2 emissions from fossil fuel burning, industry, and deforestation have been
absorbed by natural
sinks such as the forests and
oceans.
«Marine phytoplankton
absorb carbon in the same way as trees on land, and when phytoplankton die and
sink into the deep
ocean, the carbon they contain is locked away for thousands of years.
As a large
sink, the
ocean absorbs carbon dioxide from the atmosphere.
Cold, polar waters constantly
absorb CO2,
sink as it becomes more dense, and is transported to the equatorial waters via the ThermoHaline and outgases in the warmer waters of the Indian and Pacific
Oceans.
Dan H.: «Cold, polar waters constantly
absorb CO2,
sink as it becomes more dense, and is transported to the equatorial waters via the ThermoHaline and outgases in the warmer waters of the Indian and Pacific
Oceans.»
The critical factor is probably the rate of increase in heat content of the Southern
Ocean, and the ability of the massive heat
sink of Antarctica to
absorb this.
Yet the fact that
oceans are currently a net
sink for CO2 and actively
absorbing in the neighborhood of 40 % of the CO2 emissions generated by the burning of fossil fuels is well - documented through observations.
Carbon dioxide from burning fuels and forests is flowing in twice as fast as it is being
absorbed by plants and the
ocean, and some of those «
sinks» are in fact getting saturated, it appears, meaning that the «drain» is clogging a bit.
They're talking about the time it takes for half the CO2 in the air to be
absorbed by
sinks like the
ocean.
Of the emitted CO2 from burning of fossil fuels, about 50 % is
absorbed by the
ocean and terrestrial carbon
sinks at present.
For example: 1) plants giving off net CO2 in hot conditions (r / t aborbing)-- see: http://www.climateark.org/articles/reader.asp?linkid=46488 2) plants dying out due to heat & drought & wild fires enhanced by GW (reducing or cutting short their uptake of CO2 & releasing CO2 in the process) 3)
ocean methane clathrates melting, giving off methane 4) permafrost melting & giving off methane & CO2 5) ice & snow melting, uncovering dark surfaces that
absorb more heat 6) the warming slowing the thermohaline
ocean conveyor & its up - churning of nutrients — reducing marine plant life & that carbon
sink.
It is postulated that the
ocean is a major carbon
sink,
absorbing most of the missing 50 percent of the co2.
The critical factor is probably the rate of increase in heat content of the Southern
Ocean, and the ability of the massive heat
sink of Antarctica to
absorb this.
Pacala and Socolow further theorize that advancing technology would allow for annual carbon emissions to be cut to 2 billion tons by 2104, a level that can be
absorbed by natural carbon
sinks in land and
oceans.
Isn't it evident that as the surface warms the
ocean heat
sink will tend to
absorb more heat, and that if the surface cools then the
ocean releases heat?
This, it says, triggered droughts in tropical regions and reduced the capacity of «
sinks» like forests, vegetation and the
oceans to
absorb CO2.
The mass balance and d13C balance shows that vegetation as
sink is not large enough to
absorb all human CO2 if the
oceans are a source and ice cores show that CO2 and temperature go to a (surprisingly linear) new equilibrium for every change in temperature level, not a sustained increase or decrease.
Instead,
ocean life
absorbs CO2 during photosynthesis and, while most of the gas escapes within about a year, some of it is transported down into the deep
ocean via dead plants, body parts, faeces, and other
sinking materials.
Carbon
sinks (ecosystems which
absorb CO2, like
oceans and forests) respond to climate change in two different ways.
However, many carbon
sinks (e.g. the
ocean) become less effective at
absorbing carbon dioxide at higher concentrations of dissolved CO2.
Cold water in clouds is the nearest
sink that
absorbs the CO2 that is outgassed from the surface of the
ocean.
Update Dec. 12, 10:55: The deal also calls for balancing out carbon emissions caused by humans with those that can be
absorbed back in by
sinks (such as trees and
oceans).
Oceans are the biggest
sink right now — we have reasonable numbers on how much they're
absorbing through pH measures and satellite observation of chlorophyll production.
Nearly 1/3 of the 8 GtC / year is
absorbed by just forests worldwide currently http://www.csiro.au/news/Forests-
absorb-one-third-our-fossil-fuel-emissions.html Which leaves a miserly 1.333 GtC / year for the rest of the biological
sinks (and
oceans) to
absorb leaving the atmosphere CO2 at 4 GtC / year increase = the CO2 levels are still to low and this shows the CO2 global pathway as definitely unknown.
Interestingly enough, if you correct that first graph in this post for seasonal effects (you know, plants growing in the spring, dying off in the fall), and the fact that about half (by mass balance) of our emissions are
absorbed by
ocean and plant
sinks, those two lines will track each other very well.
That gives what is
absorbed in the
oceans, again with large margins of error, but a real
sink.
The
oceans are acting as a heat
sink for rising temperatures and have
absorbed about one - third of the carbon dioxide produced by human activities.
Furthermore, they found «increasing evidence (P = 0.89) for a long - term (50 - year) increase in the airborne fraction (AF) of CO2 emissions, implying a decline in the efficiency of CO2
sinks on land and
oceans in
absorbing anthropogenic emissions.»
This is a fortuitous thing, for if there was not this alteration of the energy flow, with the
oceans absorbing more heat being the excellent heat
sink they are, we'd have a much faster warming troposphere as greenhouse gases increase.
Southern
Ocean may not
absorb more CO2 emissions Southern
Ocean may not
absorb more CO2 emissions Giant carbon
sink is saturated mongabay.com May 17, 2007 Climate change has weakened one...
North Atlantic carbon
sinks absorbing less CO2 North Atlantic carbon
sinks absorbing less CO2 mongabay.com October 23, 2007 The capacity of the North Atlantic
ocean to
absorb atmospheric carbon dioxide...
It is counterintuitive for ACO2 to be so different from natural CO2 to the extent that there is no or little capacity for
sinks to reabsorb the human emissions; it is also problematic that there should be a situation where temperatures have slightly increased and yet the
ocean remains a net
absorber and not emitter of CO2.
The
oceans are by far the largest heat
sink for the Earth,
absorbing the vast majority of extra heat trapped in the system by increasing concentrations of greenhouse gases.
We've discussed Sabine before; consider; if the
oceans mop up 48 % of human emissions; what do the other
sinks absorb?
The test «will show how plankton reacts to the addition of iron, what quantity of phytoplankton forms, how much CO2 is fixed -
absorbed -, what percentage of carbon remains in the system, and how much carbon is
sunk in the depths of the
ocean,» Bathmann explained to Tierramà © rica.
At the moment, about half of industrial emissions are
absorbed by
ocean and land carbon «
sinks».