Most experts deeply probing the Arctic ice,
ocean and atmosphere say that the particularly striking ice changes of late probably can be traced to a significant dose of natural variability as well as a contribution from heat trapped by the atmosphere's building greenhouse - gas blanket.
As the Joint Institute for the Study of
the Oceans and the Atmosphere says, from â a societal impacts perspective, recognition of PDO is important because it shows that «normal» climate conditions can vary over time periods comparable to the length of a human's lifetime.â
Not exact matches
Perhaps the only person who can
say «been there, done that» about both an airline
and a railroad, Branson is now working his way through a to - do list that includes ferrying people into space (Virgin Galactic), traveling to the deepest parts of the world's five
oceans (Virgin Oceanic),
and ridding the
atmosphere of 25 gigatons of carbon (the Carbon War Room).
Taalas
said that CO2 remained in the
atmosphere for hundreds of years
and in
oceans for even longer.
«The widespread loss of Antarctic ice shelves, driven by a warming
ocean or warming
atmosphere, could spell disaster for our coastlines —
and there is sound geological evidence that supports what the models are telling us,»
said Robert M. DeConto of the University of Massachusetts Amherst, a co-author of the study
and one of the developers of the ice - sheet model used.
«For example, [measuring] chlorophyll a will give you information about how much biological activity is going on,
and eventually more information about the concentration of carbon dioxide within the
ocean and the
atmosphere,»
said Yoshihisa Shirayama, executive director of research at the Japan Agency for Marine - Earth Science
and Technology in Tokyo.
Co-author Hayley Hung, a scientist with Environment Canada's Air Quality Division who studies toxic organic pollutants in the Arctic,
said that in recent years, researchers had posited that warmer conditions would liberate POPs stored in land, ice
and ocean reservoirs back into the
atmosphere.
A release point in the Southern
Ocean «When that happens, Meckler said, «you automatically generate communication between the deep ocean and the atmosp
Ocean «When that happens, Meckler
said, «you automatically generate communication between the deep
ocean and the atmosp
ocean and the
atmosphere.
«If humans change the
atmosphere and oceans to the detriment of other species,» Kevin Raskoff
says, «
and we find that jellies are filling in, we will have no one to blame but ourselves.
However, the Clark School researchers
say blue whirls could improve remediation - by - combustion approaches by burning the oil layer with increased efficiency, reducing harmful emissions into the
atmosphere around it
and the
ocean beneath it.
«I never considered that weather events tens of kilometers high in the
atmosphere significantly influence the decadal - to century - scale circulation kilometers deep into the
ocean,»
says climatologist Judah Cohen of Atmospheric
and Environmental Research in Lexington, Massachusetts, who did not take part in this study.
Climate — the interplay among land,
ocean and atmosphere — has a long memory, Marcott
says.
That region, he
says, is susceptible to even small amounts of warming
and cooling from the
atmosphere —
and how cold the water gets influences how much or how little it sinks, thereby driving or delaying, respectively, the
ocean conveyer belt.
Species that live in these regions, such as krill
and salmon, play a critical role in supporting global marine ecosystems,
said Kathryn Sullivan, the Under Secretary of Commerce for
Oceans and Atmosphere and NOAA's Administrator.
«There was relatively more carbon dioxide emitted from the deep
ocean and released to the
atmosphere as the climate warmed,» Jaccard
says.
Bowen
says the two relatively rapid carbon releases (about 1,500 years each) are more consistent with warming
oceans or an undersea landslide triggering the melting of frozen methane on the seafloor
and large emissions to the
atmosphere, where it became carbon dioxide within decades.
«Today, we are facing rising carbon dioxide contents in the
atmosphere through human activities,
and the amount of oxygen in the
ocean may drop correspondingly in the face of rising seawater temperatures,» Lyons
said.
«In studying one of the most dramatic episodes of global change since the end of the age of the dinosaurs, these scientists show that we are currently in uncharted territory in the rate carbon is being released into the
atmosphere and oceans,»
says Candace Major, program director in the National Science Foundation (NSF)'s Division of
Ocean Sciences, which funded the research.
That's greater than the warming rate of either the
ocean or the
atmosphere,
and it can have profound effects, the scientists
say.
«We argue that it was the establishment of the modern deep
ocean circulation — the
ocean conveyor — about 2.7 million years ago,
and not a major change in carbon dioxide concentration in the
atmosphere that triggered an expansion of the ice sheets in the northern hemisphere,»
says Stella Woodard, lead author
and a post-doctoral researcher in the Department of Marine
and Coastal Sciences.
«We're trying to understand how what we're doing to the Earth's
atmosphere and oceans will play out in the future,»
says Bette Otto - Bliesner, who runs a full - complexity climate model —
and its 1.5 million lines of code — through a supercomputer named Yellowstone at the National Center for Atmospheric Research in Boulder.
Gross
says that the most important processes affecting day length are changes in the weather, especially unusual variations in the strength
and direction of the winds, which bring on alterations in the global circulation of the
atmosphere and ocean.
«While it has long been suggested that the PETM was caused by injection of carbon into the
atmosphere and ocean, the mechanism has remained elusive until now,» Ridgwell
said.
Cantwell
said that the science underway at DOE will be critical to understanding the impacts of the rising greenhouse - gas levels in the
atmosphere — from Arctic sea - ice melt to
ocean acidification —
and maintaining US leadership in clean - energy technologies.
«We have toxic algae events that result in shellfish closures off the Washington
and Oregon coast every three to five years or so, but none of them have been as large as this one,»
said lead author Ryan McCabe, a research scientist at the UW's Joint Institute for the Study of the
Atmosphere and Ocean, a collaborative center with NOAA.
«The
atmosphere and the
ocean are both complex dynamical systems,» he
says, noting that computers are still not up to the task of handling them both at the same time.
«While advances in science
and technology
and improved safety practices have significantly reduced the threat of oil spills in Canadian waters over the past few decades, much about the fate, environmental impacts
and remediation of oil spills remain poorly understood,»
said Kenneth Lee, the director of
Oceans and Atmosphere, Commonwealth Scientific
and Industrial Research Organization, Perth, Western Australia
and chair of the seven - member panel.
«While the detection of greening is based on data, the attribution to various drivers is based on models,»
said co-author Josep Canadell of the
Oceans and Atmosphere Division in the Commonwealth Scientific
and Industrial Research Organisation in Canberra, Australia.
«Because the
ocean is in contact with the
atmosphere, there's heat exchange between the
atmosphere and the surface
ocean,» he
said.
Although the
atmosphere seems invisible
and gaseous, it's a more apt description to
say we're surrounded by an
ocean of air that acts more like a fluid.
«The tropical Pacific
ocean -
atmosphere system has been called a sleeping dragon because of how it can influence climate elsewhere,»
said lead author Aradhna Tripati, a UCLA assistant professor in the departments of Earth, planetary
and space sciences,
and atmospheric
and oceanic sciences.
«There is a growing body of data that points to oxygen production
and accumulation in the
ocean and atmosphere long before the GOE,»
said Timothy W. Lyons, a professor of biogeochemistry in the Department of Earth Sciences
and the lead author of the comprehensive synthesis of more than a decade's worth of study within
and outside his research group.
«This period of extended low oxygen spanning from roughly 2 to less than 1 billion years ago was a time of remarkable chemical stability in the
ocean and atmosphere,» Lyons
said.
Study co-author Katy Sheen, a Postdoctoral Research Fellow from
Ocean and Earth Science at the University of Southampton, says: «These findings will help us to understand the processes that drive the ocean circulation and mixing so that we can better predict how our Earth system will respond to the increased levels of carbon dioxide that we have released into the atmosphere.&r
Ocean and Earth Science at the University of Southampton,
says: «These findings will help us to understand the processes that drive the
ocean circulation and mixing so that we can better predict how our Earth system will respond to the increased levels of carbon dioxide that we have released into the atmosphere.&r
ocean circulation
and mixing so that we can better predict how our Earth system will respond to the increased levels of carbon dioxide that we have released into the
atmosphere.»
This approach, Follows
says, oversimplifies the processes taking place in the
ocean that may ultimately contribute to how carbon moves through the
oceans and atmosphere.
Zehner
says that the agency plans to build
and launch at least five «sentinel» satellites to monitor not only trace gases that indicate pollution in the
atmosphere, but also the surface temperature of the
oceans, the movement of ice
and the shifting of land masses.
, chairwoman of the
Oceans,
Atmosphere, Fisheries
and Coast Guard Subcommittee,
said the senator had not seen NOAA's evaluation of the bill
and could not comment.
«From what we know, Mars did have life
and oceans and a thick
atmosphere,»
says NASA planetary scientist Christopher McKay.
Our goal was to fingerprint the source of methane in the Arctic
Ocean to determine if ancient methane was being liberated from the seafloor
and if it survives to be emitted to the
atmosphere,»
says Sparrow, who conducted the study, published in Science Advances, as part of her doctoral research at the University of Rochester.
Temperatures last year broke a 2015 record by almost 0.2 C (0.36 F), Copernicus
said, boosted by a build - up of greenhouse gases in the
atmosphere and by a natural El Nino weather event in the Pacific
Ocean, which releases heat to the
atmosphere.
«Our findings make alternative theories for the origin of the
atmosphere and oceans equally plausible, such as icy comets or meteorites bringing water to Earth,»
said Dr Kendrick from the ANU Research School of Earth Sciences.
But the models also suggest that the scheme could go too far: Adding excess sulfur could increase ice in Antarctica, «overcompensating» for warming,
says Rasch, which could affect ecosystems
and the global
ocean -
atmosphere system in a myriad of ways that scientists haven't studied.
«Of the carbon dioxide human beings put into the
atmosphere from the burning of fossil fuels
and deforestation,» Berry
says, «roughly a third remains in the
atmosphere, a third goes into terrestrial ecosystems,
and a third goes into the
ocean.»
«Once the
ocean -
atmosphere system was isolated, we could systematically probe how changes in the seawater due to biological activity affect the composition
and climate properties of the sea spray aerosol,»
said Prather, a professor in the Department of Chemistry
and Biochemistry who holds a joint appointment at Scripps Institution of Oceanography.
«The model we developed
and applied couples biospheric feedbacks from
oceans,
atmosphere,
and land with human activities, such as fossil fuel emissions, agriculture,
and land use, which eliminates important sources of uncertainty from projected climate outcomes,»
said Thornton, leader of the Terrestrial Systems Modeling group in ORNL's Environmental Sciences Division
and deputy director of ORNL's Climate Change Science Institute.
«If this conclusion is confirmed by future observations, it would mean that the coastal
ocean will become more
and more efficient at removing carbon dioxide from the
atmosphere,»
said Goulven Lurallue, the paper's lead author
and a researcher with Université Libre de Bruxelles in Belgium.
«Loss of oxygen in the
ocean is one of the serious side effects of a warming
atmosphere,
and a major threat to marine life,»
said NCAR scientist Matthew Long, lead author of the study.
«If all of the Earth's water is on the surface, that gives us one interpretation of the water cycle, where we can think of water cycling from
oceans into the
atmosphere and into the groundwater over millions of years,» she
said.
In spring, she
said, it is harder for the
ocean and atmosphere «to essentially see each other.»
«People who try to predict the circulation of
ocean currents
and the
atmosphere have to know how energies mix — in this case, the heat energy
and heat flux,» Hou
said.