When they sink to the seafloor at the end of their life cycles, they take
the carbon from the surface waters with them, provide it as food to organisms at the bottom or store it in deep water layers after decomposition.
Not exact matches
As these winds enhance ocean circulation, they may be encouraging
carbon - rich
waters to rise
from the deep, say the team, meaning that
surface water is less able to absorb CO2
from the atmosphere.
But the researchers suspect that the creatures» poop, as well as their mucus houses, could transfer microplastics
from the
water's
surface to the depths of the sea (along with nutrients such as
carbon that cycle through the environment).
From remote observations, the team assumes that Bennu should contain
water and organic — or
carbon - rich — material, but they don't know yet how this material is distributed across the
surface.
Trees perform three major climate functions: They absorb
carbon, which they pull
from the atmosphere, creating a cooling effect; their dark green leaves absorb light
from the sun, heating Earth's
surface; and they draw
water from the soil, which evaporates into the atmosphere, creating low clouds that reflect the sun's hot rays (a mechanism known as evotranspiration that also leads to cooling).
«The operation of an enhanced geothermal system uses the injection of a fluid (
water or
carbon dioxide) to extract thermal energy
from the rock located a few thousand metres below the
surface, and whose permeability has been improved or stimulated previously with fracturing processes,» explains César Chamorro, one of the authors.
The next most abundant gases —
water vapor and
carbon dioxide — do absorb a portion of the infrared heat radiated by the earth's
surface, thereby preventing it
from reaching space.
In these areas, deep ocean
waters that are naturally rich in
carbon dioxide are upwelling and mixing with
surface waters that are absorbing
carbon dioxide
from the atmosphere.
The oceans are great at absorbing
carbon dioxide (CO2)
from the air, but when their deep
waters are brought to the
surface, the oceans themselves can be a source of this prevalent greenhouse gas.
The discovery team presumes that VP113 has an icy reflective
surface like other relatively small, outer Solar System objects, as the dwarf planet is observed to have a pink tinge, which is hypothesized to result
from chemical changes produced by the effect of radiation on frozen
water, methane, and
carbon dioxide.
The orbital distance
from Zavijava where a planet currently would be «comfortable» for Earth - type
carbon - based lifeforms with liquid
water on the planetary
surface in the so - called habitable zone is centered near 1.87 AU — between the orbital distances of Mars and the Main Asteroid Belt in the Solar System.
Four and a half billion years after its birth, the shrouded planet is much too hot to support the presence of liquid
water on its
surface because of its dense
carbon dioxide atmosphere and sulfuric acid clouds, which retain too much radiative heat
from the Sun through a runaway greenhouse effect.
Ignoring the physics of the problem — how the asserted heat was transferred
from atmospheric
carbon dioxide, through the sea
surface, and beyond the first mile of ocean
waters, without being detected — they expect us to believe that fluid thermodynamics is akin to magic.
Based on evidence
from Earth's history, we suggest here that the relevant form of climate sensitivity in the Anthropocene (e.g.
from which to base future greenhouse gas (GHG) stabilization targets) is the Earth system sensitivity including fast feedbacks
from changes in
water vapour, natural aerosols, clouds and sea ice, slower
surface albedo feedbacks
from changes in continental ice sheets and vegetation, and climate — GHG feedbacks
from changes in natural (land and ocean)
carbon sinks.
If the radiation
from one molecule of
carbon dioxide in every 2,500 air molecules could actually slow the rate of cooling of Earth's
surface, then the radiation
from water vapour should slow the cooling at least a hundred fold, making rain forests about 50 degrees hotter than dry regions at similar latitudes and altitudes.
As to the absorption of long - wave radiation
from the earth's
surface, while it may be true that
carbon dioxide and
water together do absorb certain frequency ranges of that radiation, I don't think that that matters a whole lot because most of the heat
from the
surface is transported to the top of the troposphere by conduction, convection and latent heat of vaporization of
water during the day.
The effects vary by region, and they are significant, altering the ocean's
carbon cycle
from the
surface, where photosynthetic organisms fix
carbon from the atmosphere, all the way through the
water column to the seafloor, where
carbon can be sequestered.
Surface waters above Arctic methane seeps absorbed 2,000 times more
carbon dioxide
from the atmosphere than the amount of methane that escaped into the atmosphere
from the same
waters.
For more than a decade, researchers have struggled and failed to balance global
carbon budgets, which must balance
carbon emissions to the atmosphere
from fossil fuels (6.3 Pg per year; numbers here
from Skee Houghton at Woods Hole Research Center) and land use change (2.2 Pg; deforestation, agriculture etc.) with
carbon dioxide accumulation in the atmosphere (3.2 Pg) and the
carbon sinks taking
carbon out of the atmosphere, especially
carbon dioxide dissolving in Ocean
surface waters (2.4 Pg).
Carbon dioxide is fully part of that
water cycle where
water heated by the thermal infrared direct
from the Sun evaporates and anyway lighter than air rises in air and takes away heat
from the
surface — all pure clean rain is carbonic acid, the
water vapour spontaneously joining with
carbon dioxide in the atmosphere releases its heat in the colder heights and condenses out back into liquid
water and ice, cooling the Earth
from the 67 °C it would be without the
water cycle.
The world's mangrove forests, with their archetypal twisted roots protruding
from the
water surface, store more than 4bn tonnes of
carbon, new... Read More
The
carbon chemistry of the
surface waters is thus changing much more quickly than can be explained by simple immediate forcing
from atmospheric CO2.
New research
from the Australian Antarctic Division suggests whales naturally fertilize
surface waters with iron - rich whale excrement, allowing the whole eco-system to send more
carbon down into deep
waters.
Movement of the
carbon from the
surface into the middle depths and deeper
waters takes longer — between decades and many centuries.
Cold
water from depth can hold more
carbon dioxide then the tropical
surface water does and will start absorbing
carbon dioxide
from the air as the prevailing winds blow over it.
Some of the heat flowing back toward space
from the Earth's
surface is absorbed by
water vapor,
carbon dioxide, ozone and several other gases in the atmosphere and then re-radiated back toward the Earth's
surface.
And at the same time, krill also play a key role in slowing global warming, as they transport
carbon dioxide
from the
surface to the deep
water.
Ingersoll [105] discussed the role of
water vapours in the «runaway greenhouse effect» that caused the
surface of Venus to eventually become so hot that
carbon was «baked»
from the planet's crust, creating a hothouse climate with almost 100 bars of CO2 in the air and a
surface temperature of about 450 °C, a stable state
from which there is no escape.
Earth has a natural «greenhouse effect» that results
from gases like
water vapor,
carbon dioxide (CO2), and methane absorbing heat radiated
from the Earth's
surface and lower atmosphere and radiating that heat back towards the
surface.
The increased albedo
from melting arctic ice should not matter very much, but the newly exposed cold
surface water might absorb extra
carbon dioxide, acting as a negative feedback on the whole system.
The scientists estimated that the swarm consumed up to 74 percent of microscopic
carbon - containing plants
from the
surface water per day, and their sinking fecal pellets transported up to 4,000 tons of
carbon a day to deep
water.
So, even if
carbon dioxide in the atmosphere increased a thousand-fold, and even if there was no
water vapor, there is a limit to how much IR CO2 can absorb, and that limit is 10 % (or less) of all the IR emitted
from the
surface.
Climate models encapsulate what we know about how the Sun's rays travel through the atmosphere and how heat
from the
surface of the Earth gets absorbed by clouds,
water vapour and, of course,
carbon dioxide.
This Arctic halocline would have created a barrier to upwelling, which blocked deep
carbon - dioxide - rich deep
waters from rising to the
surface.