The accelerated warming of the oceans is likely the main contributor.
Not exact matches
Rising temperatures will
warm the
oceans and
accelerate melting
of land ice, affecting sea - levels along the California coast.
The Arctic took another 3,000 - 4,000 years to
warm this much, primarily because
of the fact that the Northern Hemisphere had huge ice sheets to buffer
warming, and the fact that changes in
ocean currents and Earth's orbital configuration
accelerated warming in the south.
Now, scientists can trace the beginning
of this
accelerated melting to a surge
of warming in the Pacific
Ocean more than 70 years ago.
Using sediment gathered from the
ocean floor in different areas
of the world, the researchers were able to confirm that as the ice sheets started melting and the climate
warmed up at the end
of the last ice age, 18,000 years ago, the marine nitrogen cycle started to
accelerate.
Pollution
of the
ocean by runoff from the land and the fouling
of the air with carbon dioxide (which is
warming the
ocean and acidifying it) are
accelerating and expanding the threats to the world's coastal waters.
At the same time as the surface is cooling, the deeper
ocean is
warming, which has already
accelerated the decline
of glaciers in the Amundsen Sea Embayment.»
This shift strengthens the
ocean currents that bring
warm, salty water to the surface, where it
accelerates the melting
of Antarctic ice.
When their waters get
warmer, their metabolism
accelerates and they need more oxygen to sustain their body functions,» said William Cheung, co-author
of the study, associate professor at the Institute for the
Ocean and Fisheries and director
of science for the Nippon Foundation - UBC Nereus Program.
«Without the existence
of these proteins that could help phytoplankton cope in these stressful environments, the phytoplankton diversity in many regions
of the
ocean would be much lower, in particular by reducing large phytoplankton such as diatoms that are known to take up a lot
of carbon dioxide, thus possibly
accelerating the pace
of a
warming planet,» said Marchetti, assistant professor
of marine science at UNC - Chapel Hill.
«At the same time as the surface is cooling, the deeper
ocean is
warming, which has already
accelerated the decline
of glaciers on Pine Island and Totten.
As glaciers and overland ice sheets shed ice and the
warming oceans expand, sea level rise is
accelerating; NASA says the rate
of sea level rise has jumped from 1 millimeter per year 100 years ago to 3 millimeters per year today.
Their argument goes like this: It is not possible that
warming of the deep
ocean accelerates at the same time as
warming of the upper
ocean slows down, because the heat must pass through the upper layer to reach the depths.
«This uncertainty is illustrated by Pollard et al. (2015), who found that addition
of hydro - fracturing and cliff failure into their ice sheet model increased simulated sea level rise from 2 m to 17 m, in response to only 2 °C
ocean warming and
accelerated the time for substantial change from several centuries to several decades.»
Factors contributing to the
accelerating erosion appear to be a combination
of warmer air temperatures and reduced summer
ocean ice cover.
However, the claims by certain scientists that the extremely active hurricane seasons
of 2004/2005 were due to a cyclic phenomenon in the Atlantic
ocean known as the «Atlantic Multidecadal Oscillation», in which an
accelerating Gulf Stream causes
warm water to move northward, were quite astounding and also unsupported.
There was an interesting study in Nature Geoscience last Sunday showing pretty clearly that the
accelerating flow
of the Jacobshavn glacier in recent years was most likely driven by an influx
of warm deep seawater, and that shift was likely due to changes in pressure and wind patterns over the North Atlantic
Ocean.
Until we clear up whether there has been some kind
of accelerated warming at depth in the real
ocean, I think these results serve as interesting hypotheses about why the rate
of surface
warming has slowed - down, but we still lack a definitive answer on this topic.
This suggestion
of an
accelerated warming in a deep layer
of the
ocean has been suggested mostly on the basis
of results from reanalyses
of different types (that is, numerical simulations
of the
ocean and atmosphere that are forced to fit observations in some manner).
England et al. suggest that the recent Pacific
Ocean surface temperature anomalies are related to a strengthening
of Pacific trade winds in the past two decades, and that
warming is likely to
accelerate as the trade wind anomaly abates.
But as cogently interpreted by the physicist and climate expert Dr. Joseph Romm
of the liberal Center for American Progress, «Latif has NOT predicted a cooling trend — or a «decades - long deep freeze» — but rather a short - time span where human - caused
warming might be partly offset by
ocean cycles, staying at current record levels, but then followed by «
accelerated»
warming where you catch up to the long - term human - caused trend.
So while
warmer oceans and a more fertile atmosphere might
accelerate some kinds
of plankton bloom, the seas could become too acidic for tropical micro-organisms.
I find concerned liberals are loath to talk about how consistently wrong climate models have been or about the «pause» in global
warming that has gone on for over fifteen years, while climate skeptics avoid discussion
of things like
ocean acidification and
accelerated melting in Greenland and the Arctic.
Such a change will
accelerate the flow
of heat energy from the
ocean surface to the atmosphere and offset any
warming of the «skin» from any extra CO2 caused by humans.
Subsequent to the complete collapse
of the Super El Niño phenomenon, the world's
oceans have not experienced rapid, dangerous and
accelerating global
warming - no tipping point and runaway «boiling» seas as predicted by experts
Whether we look at the steady increase in global temperature; the buildup
of greenhouse gases in the atmosphere to the highest level in a half - million years; the march
of warmest - ever years (9
of the10 hottest on record have occurred since 2000); the dramatic shrinking
of mountain glaciers and Arctic sea ice; the
accelerating rise in sea level; or the acidification
of our
oceans; the tale told by the evidence is consistent and it is compelling.
The backdrop to the renewed interest in asserting territorial claims on the Arctic and Antarctic by states such as Canada, the United States, Russia and the United Kingdom is that global
warming, and in particular the
warming of oceans, is leading to
accelerating erosion
of the ice mass at both poles.
Additionally, the less sea ice covers the surface
of the
ocean, the more sunlight is absorbed by the water, which scientists warn could
accelerate the Arctic's
warming.
In addition to direct MYI melt due to high - latitude
warming, the impact
of enhanced upper -
ocean solar heating through numerous leads in decaying Arctic ice cover and consequent ice bottom melting has resulted in an
accelerated rate
of sea - ice retreat via a positive ice - albedo feedback mechanism.
I would probably phrase it this way: Global
warming will
accelerate if the
oceans soak up less
of the greenhouse gas.
At the same time, the
warming of the
oceans — and the
warming of the Earth as a whole — has
accelerated.
J. T. Fasullo, R. S. Nerem & B. Hamlington Scientific Reports 6, Article number: 31245 (2016) doi: 10.1038 / srep31245 Download Citation Climate and Earth system modellingProjection and prediction Received: 13 April 2016 Accepted: 15 July 2016 Published online: 10 August 2016 Erratum: 10 November 2016 Updated online 10 November 2016 Abstract Global mean sea level rise estimated from satellite altimetry provides a strong constraint on climate variability and change and is expected to
accelerate as the rates
of both
ocean warming and cryospheric mass loss increase over time.
Abstract: «Global mean sea level rise estimated from satellite altimetry provides a strong constraint on climate variability and change and is expected to
accelerate as the rates
of both
ocean warming and cryospheric mass loss increase over time.
Hence CO2 ramped up ever faster in the atmosphere, further
accelerating warming, until you have the same symptoms
of a global -
warming - mass - extinction like the end Triassic or even Permian (
ocean acidification, jump in global temperatures,
ocean anoxia, etc).
Methane Hydrates» Melt - was first observed to be
accelerating during the last decade, with sufficient
ocean warming reaching the hydrates in the sea bed
of continental shelves off Norway and eastern Canada, where the hydrate stocks are vulnerable to newly
warmed currents.
The evidence includes
accelerated sea level rise, rising global temperatures,
warming oceans, declining Arctic ice sheet, worldwide glaciers retreat, increase
of extreme weather events and
ocean acidification.
Of course, that will never happen because the
ocean - air interface is going to keep
warming with the + CO2 that will keep happening and it's all going to
accelerate.
Considering all the short - term factors identified by the scientific community that acted to slow the rate
of global
warming over the past two decades (volcanoes,
ocean heat uptake, solar decreases, predominance
of La Niñas, etc.) it is likely the temperature increase would have
accelerated in comparison to the late 20th Century increases.
In addition, if permafrost melts, releasing its long - held carbon dioxide or methane into the atmosphere, and methane hydrates at the bottom
of the continental shelves
of the Arctic
Ocean are destabilized, there could be highly
accelerated warming.
We know that GMAST underwent a substantial mid-century gyration where 20th century
warming actually reversed for a couple
of decades before
accelerated upwards again but we do NOT know that
ocean heat content underwent any such gyration.
•
Accelerated warming because
of decreased
ocean uptake
of CO2 from atmosphere by phytoplankton and CFCs acting as greenhouse gases
Claims
of rapid,
accelerating, dangerous and unequivocal global
warming from CO2 and other greenhouse gases means that should be happening... especially for the
oceans that represent about 72 %
of the Earth's surface... yet the latest empirical evidence shows the above adjectives are big fat lies when it comes to this gigantic thermal sink... Ooops... those stubborn facts strike again...
Air Pollution and Materials • Increased acid deposition • Increased photochemical smog • Degradation
of outdoor paints and plastics Fig, p. 488 Global
Warming • Accelerated warming because of decreased ocean uptake of CO2 from atmosphere by phytoplankton and CFCs acting as greenhous
Warming •
Accelerated warming because of decreased ocean uptake of CO2 from atmosphere by phytoplankton and CFCs acting as greenhous
warming because
of decreased
ocean uptake
of CO2 from atmosphere by phytoplankton and CFCs acting as greenhouse gases
According to a study published Monday, global sea level rise is
accelerating as a result
of ocean water
warming and sooner - than - expected ice loss from the west Antarctica and Greenland ice sheets, and could reach 26 inches by 2100.
«Variability in the
ocean will not affect long - term climate trends but may mean we have a period
of accelerated warming to look forward to,» he said.
Using the NOAA's high - resolution
ocean temperature dataset, the chart above reveals the absolute non-existence
of «
accelerating» global
warming, for all the world's
oceans, and for those tropical waters that NASA predicts we will witness boiling.
This ties in to our previous posts noting that global
warming is
accelerating; but that over the past decade, most
of that
warming has gone into the
oceans (including the oft - neglected deep
oceans).
Warmer air and
ocean temperatures have caused the glacier to detach from a stabilizing sill and retreat rapidly along a downward - sloping, marine - based bed... After 8 years
of decay
of its ice shelf, Zachariæ Isstrøm, a major glacier
of northeast Greenland that holds a 0.5 - meter sea - level rise equivalent, entered a phase
of accelerated retreat in fall 2012.
Since to me (and many scientists, although some wanted a lot more corroborative evidence, which they've also gotten) it makes absolutely no sense to presume that the earth would just go about its merry way and keep the climate nice and relatively stable for us (though this rare actual climate scientist pseudo skeptic seems to think it would, based upon some non scientific belief — see second half
of this piece), when the earth changes climate easily as it is, climate is ultimately an expression
of energy, it is stabilized (right now) by the
oceans and ice sheets, and increasing the number
of long term thermal radiation / heat energy absorbing and re radiating molecules to levels not seen on earth in several million years would add an enormous influx
of energy to the lower atmosphere earth system, which would mildly
warm the air and increasingly transfer energy to the earth over time, which in turn would start to alter those stabilizing systems (and which, with increasing
ocean energy retention and
accelerating polar ice sheet melting at both ends
of the globe, is exactly what we've been seeing) and start to reinforce the same process until a new stases would be reached well after the atmospheric levels
of ghg has stabilized.
As we know the
oceans have cooled, it follows that any «
accelerated rise in sea - levels» can not be due to
warming of the
oceans.