04 Mar 2015:
Hurricanes Help Spread
Invasive Marine Species, Researchers Find
Hurricanes can accelerate the spread of invasive marine species — in particular the lionfish, a hardy invader that
An adult lionfish
can overrun ecosystems and devastate native biodiversity — according to research
published in the journal Global Change Biology
. Researchers found that hurricanes, by forcing changes in strong ocean currents, have helped lionfish spread from the Florida Straits to the Bahamas since 1992, increasing the spread of the species by 45 percent and their population size by 15 percent. Normally the currents pose a barrier to the transport of lionfish eggs and larvae, the researchers say, but as a hurricane passes, the current shifts and carries lionfish larvae and eggs from Florida to the Bahamas. Scientists say climate change may increase the frequency or intensity of future storms, which could further accelerate the spread of marine invasives.
02 Mar 2015:
Emperor Penguins Had Few
Refuges During Last Ice Age, Study Finds
The Ross Sea and certain other Antarctic waters likely served as refuges for the three emperor penguin populations that
survived during the last ice age, when large amounts of ice made much of the rest of Antarctica uninhabitable, according to a new study
published in the journal Global Change Biology
. The findings suggest that extreme climatic conditions on the continent during the past 30,000 years created an evolutionary "bottleneck" that is evident in the genetic material of modern-day emperor penguins, a species known for its ability to thrive in icy habitats. But during the last ice age, the Antarctic likely had twice as much sea ice, the researchers say, leaving only a few locations for the penguins to breed — distances from the open ocean (where the penguins feed) to the stable sea ice (where they breed) were too great. The three populations that did manage to survive may have done so by breeding near areas of ocean that are kept free of sea ice by wind and currents, the researchers suggest.
23 Feb 2015:
Large-scale Pumping Can
Return Oxygen To Deep Waters, Study Finds
A team of Danish and Swedish scientists reports
that they have restored oxygen to the waters
Deploying instruments in Byfjord, Sweden.
of a deep fjord that had suffered from a long-term lack of oxygen. The researchers used large pumps to mix oxygen-rich surface water into the deeper parts of the fjord's water column — which had long been anoxic due to its depth and geological setting — and after only two months higher oxygen concentrations became detectable in the bottom waters. "In the later phase of the experiment the entire water column began to look healthy," the researchers said, noting that bacterial species that live in well-oxygenated waters had begun to appear. Low oxygen levels make waters uninhabitable to most forms of life, and anoxic waters often harbor only a few types of bacteria, some of which produce significant levels of greenhouse gases.
19 Feb 2015:
New York City Set for Major
Sea Level Rise By 2050, Report Concludes
The waters surrounding New York City are on track to rise 11 to 21 inches by the 2050s, according to an analysis
NASA climate change models. The city's average temperature, which has increased by 3.4 degrees F since 1900, is set to rise another 5 degrees F by the 2050s, the report says, and annual precipitation is also likely to rise significantly over that period. New York City has already seen sea levels rise by over 1 foot since 1900 — nearly twice the average global rate, according to the report, which was published by the New York City Panel on Climate Change. Mayor Bill de Blasio said the report highlights the urgency of mitigating climate change and adapting to its risks, and he announced a commitment
to cut the city's emissions by 80 percent by 2050.
Interview: Why Ocean Health Is
Better, and Worse, Than You Think
In a recent groundbreaking study in Science
, a group of marine experts — including lead author Douglas
McCauley — delivered a sobering message: The world’s oceans are on the verge of major change that could cause irreparable damage to marine life. While ocean ecosystems are still largely intact, the marine world is facing unprecedented disturbances, including ocean acidification and habitat destruction from deep-sea mining, oil and gas drilling, development, and aquaculture. In an interview with Yale Environment 360
, McCauley discusses the parallels of the loss of wildlife on land and at sea and explains why creating marine reserves and establishing international ocean zoning regulations would help blunt the damage from a looming “marine industrial revolution.”
Read the interview.
16 Feb 2015:
Space-Based Measurments Can
Track Global Ocean Acidity, Researchers Say
An international team of scientists has developed new methods for studying the acidity of the oceans from space,
Global ocean alkalinity measured from space.
according to research
published in the journal Environmental Science and Technology
. Currently, scientists must rely on measurements taken from research vessels and sampling equipment deployed in oceans to determine acidity — which rises as the oceans absorb CO2 from the atmosphere — but this approach is expensive and geographically limited. The new techniques use satellite-mounted thermal cameras to measure ocean temperature and microwave sensors to measure salinity. Together these measurements can be used to assess ocean acidification more quickly and over much larger areas than has been possible before.
As Arctic Ocean Ice Vanishes,
Questions About Future Fishing
With the steady retreat of sea ice in the Arctic Ocean opening up vast areas of this long-frozen marine basin, a key resource
A Russian fishing vessel trawls the Arctic Ocean.
issue is now emerging: the future of fisheries, especially in central Arctic waters. What species are migrating into the region as sea ice disappears? And could the heart of the Arctic Ocean sustain a commercial fishery in the coming decades? These issues were central to a discussion at a recent conference on the fisheries of the central Arctic Ocean. With more southerly fish species migrating into warmer and increasingly ice-free regions of the Arctic Ocean, officials from the U.S. and Canada say it’s important to negotiate an international agreement on fishing before allowing fisheries to open.
Read the article.
06 Feb 2015:
Maine’s Iconic Lobsters
Face Threats From Ocean Acidification
Maine’s lobster fishery, worth $1.7 billion
to the state and a vital source of employment, could be
threatened by acidifying ocean waters
A Maine lobster
and rising sea temperatures, according to a new report. The report
, issued by a state commission, called increasingly acidic ocean waters — caused by the absorption of CO2 from the atmosphere — an “urgent matter” that needs to be addressed by state and local governments and the fishing infustry. Facing the prospect that increasing acidity could interfere with the ability of lobsters to make their shells, the commission set forth a handful of goals, including a stepped-up research effort on the acidification of the coast’s waters and its impact on crustaceans. Maine lawmakers have already introduced legislation for limits on industrial and agricultural runoff, which contribute to coastal water acidification.
15 Jan 2015:
Underwater Kelp Forests Mapped
In New Citizen Science Project
grow along roughly 25 percent of the world’s coastlines and provide valuable habitat and nutrients for many types of aquatic life. Now, research by the “Floating Forests
” project is shedding light on how these underwater kelp forests are affected by climate change. The project is using NASA satellite data to observe changes in kelp forests over a period of more than four decades. The catch: No accurate way to automate the process exists, so the researchers rely on an international team of nearly 3,500 citizen scientists to mark the bright green kelp forests, which contrast with the deep blues of the ocean in the images.
14 Jan 2015:
Offshore Wind More Profitable
Than Drilling on U.S. East Coast, Report Says
Offshore wind would produce twice the number of jobs and twice the amount of energy as offshore drilling
Offshore wind turbines in the Irish Sea
near the U.S. East Coast
, according to
a new report from the advocacy group Oceana. The report contends that recent claims by the oil and gas industry about the economic potential of offshore drilling in the region are exaggerated because many of those oil and gas reserves are not economically viable to drill. Plans to build the nation's first offshore wind farm off Cape Cod have repeatedly failed to move forward
. But Oceana calculates that over the course of 20 years, offshore wind in the Atlantic could produce nearly twice as much energy as all of the economically recoverable oil and gas. Offshore wind installations also would likely create an additional 91,000 jobs — twice as many as offshore drilling would create, Oceana says.
29 Dec 2014:
The Arctic Is Absorbing
More and More Sunlight, NASA Images Show
The Arctic has been absorbing significantly more sunlight since the year 2000, according to NASA satellite data
Changes in absorption of sunlight in the Arctic
a trend that mirrors the steady decrease in Arctic sea ice during that same period. These maps show changes in the amount of solar radiation absorbed over the Arctic from 2000 to 2014, as well as changes in sea ice cover during the same period. As sea ice cover declines and more dark ocean is exposed to the sun's rays, that decreases the reflectivity, or albedo, of the ocean's surface, meaning more heat is absorbed. Shades of red depict areas absorbing more sunlight and areas with less ice cover. The Arctic's rate of absorption has increased by 5 percent every June, July, and August since 2000. No other region on the planet has shown significant changes in albedo during that time, researchers say.
19 Dec 2014:
'Nuisance Flooding' Will Affect
Most of U.S. Coastline by 2050, Report Finds
By 2050, most U.S. coastal areas are likely to be threatened by 30 or more days of flooding each year due sea level
Nuisance flooding projections for U.S. cities
rise, according to
a new report the National Oceanic and Atmospheric Administration (NOAA). The researchers looked at the frequency of so-called "nuisance flooding," which occurs when the water level reaches one to two feet above local high tide, and found that several cities along the East Coast are already seeing more than 30 days of nuisance flooding each year. Additional major cities — including Baltimore, Atlantic City, Philadelphia, and San Francisco — will reach or exceed that benchmark by 2030, the report says. Although nuisance flooding is not typically catastrophic or dangerous, it is often costly. The report drives home the point, researchers say, that such floods will become commonplace far earlier than 2100, which is generally cited as the date when sea level rise is likely to become damaging.
17 Dec 2014:
Obama Protects Alaska's
Bristol Bay From Oil and Gas Development
President Obama yesterday announced protections for Bristol Bay, Alaska
A grizzly bear catches a salmon in Bristol Bay.
of the most productive fishing grounds in the nation, from future oil and gas development. The president's action is expected to benefit commercial fishermen and Native Alaskans and boost conservation efforts in the region, which is roughly the size of Florida. Noting that Bristol Bay is the world's largest sockeye salmon fishery and the source of 40 percent of U.S. wild-caught seafood — a catch worth $2 billion annually — Obama vowed to ensure long-term safeguards for the bay. The region has been under protection intermittently since 1989, when the Exxon Valdez spill prompted a federal moratorium on offshore drilling. "It is a natural wonder, and it’s something that’s just too precious to be putting out to the highest bidder," Obama said in a video message
. The federal government is still considering whether to allow development of what would be North America's largest open-pit mine
in the bay's watershed.
04 Dec 2014:
Arabian Sea Whales Are Earth's
Most Isolated and Endangered Population
Humpback whales inhabiting the Arabian Sea are the most genetically distinct humpback whales and may be
the most isolated population on earth, researchers report
. With fewer than 100 estimated individuals, they are "definitely the most endangered" population of humpbacks, said Wildlife Conservation Society researcher Howard Rosenbaum. The Arabian humpbacks' known range is limited to waters near Yemen, Oman, the United Arab Emirates, Iran, Pakistan, and India, and possibly the Maldives and Sri Lanka, researchers say. Genetic data suggest they have remained separate from other humpback whale populations for 70,000 years — extremely unusual in a species famed for annual migrations of 9,000 kilometers or more. The genetic separation is likely reinforced by their breeding schedule, researchers say. While Arabian humpbacks breed on a northern hemisphere schedule, their closest neighbors breed on a southern schedule.
20 Nov 2014:
Real-Time Ocean Acidification
Data Now Available for U.S. Pacific Coast
Researchers, coastal managers, and shellfish farmers along the U.S. Pacific coast can now get real-time ocean
Web portal for ocean acidification data
acidification data through an online tool
developed by the National Oceanic and Atmospheric Administration (NOAA). The data — which includes measurements of pH, carbon dioxide concentrations, salinity, and water temperatures at various sites — should help organizations and businesses make decisions about managing coastal resources and craft adaptation strategies, NOAA researchers say. The tool will feature data from five shellfish hatchery sites along the Pacific coast along with readings from NOAA’s ocean acidification monitoring sites. Ocean acidification is driven primarily by absorption of atmospheric CO2 by ocean waters, which changes seawater chemistry in a way that makes it difficult for many marine organisms to form their shells.
19 Nov 2014:
Global Maritime Shipping
Traffic Has Grown by 300 Percent Since 1992
Maritime traffic has increased four-fold over the past 20 years, causing more water, air, and noise pollution in
Maritime shipping traffic has increased rapidly.
the world's oceans and seas, according to a new study
quantifying global shipping traffic. Traffic went up in every ocean during the 20 years of the study, except off the coast of Somalia, where piracy has almost completely halted commercial shipping since 2006. In the Indian Ocean, where the world’s busiest shipping lanes are located, ship traffic grew by more than 300 percent over the 20-year period, according to the report published in the journal Geophysical Research Letters
. Burgeoning ship traffic has increased the amount air pollution, particularly above the Sri Lanka-Sumatra-China shipping lane, where researchers recorded a 50-percent increase in nitrogen dioxide, a common air pollutant, over the 20-year period. Shipping is also a major source of noise pollution, which can be harmful to marine mammals, the authors note.
13 Nov 2014:
Global Maps Detail Seasonal and Geographic Trends in Ocean Acidification
A team of scientists has published the most comprehensive analysis yet of how acidity levels vary across the world’s oceans. Drawing on four decades of
Ocean acidification map
measurements, researchers from Columbia University and the University of Colorado mapped changes in ocean acidity by season and location, as well as how acidity levels affect the stability of shell-building minerals. The maps
reveal that the northern Indian Ocean is at least 10 percent more acidic than the Atlantic and Pacific oceans, possibly due to its unique geography, the researchers say. The maps also show that ocean acidity fluctuates most in the colder waters off Siberia, Alaska, Antarctica, and the Pacific Northwest, due to cycles of deep-water upwelling and massive plankton blooms. The oceans have taken up a quarter of the carbon dioxide humans have put in the atmosphere over the last two hundred years, and acid levels at the surface have increased by 30 percent since the beginning of the industrial era, researchers say.
Interview: Saving World’s Oceans Begins With Coastal Communities
Aggressively curbing overfishing, pollution, and development is something coastal communities
can do immediately to protect their ocean resources — and with dramatic results — says marine biologist Ayana Elizabeth Johnson. As the executive director of the Waitt Institute
, an ocean conservation organization, Johnson recently put that approach to the test on the Caribbean island of Barbuda. In an interview with Yale Environment 360
, she discusses how she helped Barbuda craft rules to protect its ocean resources and why she favors community-driven conservation efforts over more top-down approaches.
Read the interview.
13 Oct 2014:
Climate Change To Make Many
Fish Species Extinct in Tropics, Study Says
Climate change is likely to drive fish and marine invertebrates toward the poles and cause extinctions
near the tropics, according to
researchers at the University of British Columbia. Under the conservative climate change scenario of one degree Celsius of warming by 2100, the 802 species modeled in the study
are predicted to move away from their current habitats by as much as 9 miles, or 15 kilometers, every decade — a rate similar to what scientists have observed over the past few decades. Under the worst-case scenario of three degrees of warming, the researchers predict marine species will move toward the poles at a rate of 26 kilometers per decade. Under that scenario, an average of 6.5 species per 0.5 degrees of latitude would become locally extinct closest to the equator. The shifts will be caused by the species' reactions to warming waters, changing ocean chemistry, and ecosystem structure near the tropics, as well as new habitats opening up nearer the poles, researchers say.
08 Oct 2014:
Floods Will Be Chronic Problem
For East Coast Cities by 2030, Study Says
By 2030, residents of Washington, D.C., and Annapolis, Maryland, could be experiencing more than 150 tidal floods every year — up
from an average of just 50 today — according to a recent study of sea level rise and coastal flood risk along the U.S. East Coast by the Union of Concerned Scientists
. In another 15 years, that number could jump to 400 floods annually, the study says. A home purchased in some of the more flood-prone parts of those two cities could see daily flooding before a 30-year mortgage was paid off, according to the study. The increased frequency will be driven by sea level rise, researchers say, which exacerbates the effects of so-called “nuisance flooding” linked to tidal cycles, rainfall, and storm surges. Other cities on the Atlantic coast will also see increased flood frequency, including Miami and Atlantic City, New Jersey, which can expect an average of 240 flood days per year by 2045.
07 Oct 2014:
Deep Oceans Not Warming As Previously Thought, Study Finds
The deepest reaches of earth's oceans have not warmed significantly over the last decade, according to scientists at NASA's Jet Propulsion Laboratory in California
— a finding that undermines a leading theory as to why the pace of global warming has slowed over the last 15 years. Scientists have speculated that the recent slowdown in rising surface air temperatures was a result of heat accumulating in the deep ocean. But in a paper
published in the journal Nature Climate Change
, the NASA researchers concluded that the vast majority of sea level rise since 2005 was attributable to just two sources: upper ocean heat expansion and glacial melting. From this they inferred that the deep ocean was not also warming. In a separate paper
published in the same journal, however, scientists from the Lawrence Livermore Laboratory noted that the upper ocean was absorbing between 24 and 58 percent more heat than was previously thought. That's not enough to account for the pause in surface air warming, but the researchers suggest
it is evidence that more accurate data on ocean warming is needed.
03 Oct 2014:
Thousands of Uncharted Ocean
Floor Features Revealed by Satellite Data
New maps of the seafloor created using satellite data reveal thousands of uncharted mountains and clues
about the formation of continents, researchers say. Among other findings, they identified a ridge in the Gulf of Mexico that had previously been associated with seafloor spreading, a major rift in the South Atlantic Ocean, and thousands of sea mountains — all of which had never before been documented. The maps are based on small ripples and dips in the surface of the ocean, which can be detected by satellites, the researchers explain in the journal Science
. Using these ocean surface variations, the scientists were able to infer the shape and contours of the new seafloor features. Previously, the only way to create detailed maps was to collect depth soundings from ships sailing directly over the seafloor, so only about 20 percent of the ocean floor had been accurately mapped, researchers say.
02 Oct 2014:
Large Sediment Plumes Flowing
From Greenland Glaciers, Images Show
Plumes of sediment-laden meltwater from southwest Greenland’s glaciers are easily recognizable in this
NASA satellite image
Sediment plumes off the coast of Greenland
captured in early September. Meltwater at the top of the ice sheet starts out relatively clean, but as it flows through glacial channels down to the ground and out into the ocean, it picks up large amounts of sediment — a byproduct of the glacier scraping the bedrock. As a result, plumes like the ones that appear light-blue in this photograph, are good markers for estimating the amount of meltwater leaving the ice sheet, researchers say. Melting from the Greenland Ice Sheet could result in global sea level rise of 2 to 8 inches, according to the most recent assessment from the Intergovernmental Panel on Climate Change.
01 Oct 2014:
Scientists Photograph Gathering
Of 35,000 Walruses on Alaskan Beach
In one of the largest gatherings of walruses documented in recent years, Alaska biologists photographed a
congress of roughly 35,000 animals resting on a beach
in northwestern Alaska. They swam to shore to rest, a walrus researcher explained, after the last remaining traces of sea ice melted in mid-September. Walruses typically rely on sea ice to provide a platform for resting and caring for their young as they swim to find clams, worms, and shrimp offshore, near the edge of the continental shelf. When no sea ice is available, as has been the case in the Chukchi Sea six of the last eight years, the walruses must make their way to shore. Besides taking them farther from their feeding grounds, the beach gatherings are dangerous for young walruses because they can be trampled, biologists say. The U.S. Fish and Wildlife Service is considering granting Endangered Species Act protections to Pacific walruses.
30 Sep 2014:
Half of the Planet's
Animals Lost Since 1970, Report Says
The number of animals on the planet has fallen 52 percent in the last 40 years, according to an analysis
Animal population trend since 1970
the conservation organization World Wildlife Fund (WWF). The group's Living Planet Index, which tracked the populations of more than 10,000 vertebrate species from 1970 to 2010, revealed major declines in key populations of mammals, birds, reptiles, amphibians, and fish. The situation is most dire in developing countries, the report said, where wildlife populations have fallen on average by 58 percent. Latin America saw the biggest declines, with more than 80 percent of the region's animals lost since 1970. Globally, freshwater populations have plummeted 76 percent. This year's numbers are worse than those calculated in the last report in 2012, which found declines of 30 percent since 1970. The organization attributed this to new statistical weighting, which it said better represents each region's biodiversity, though other researchers have been critical
of the new methodology. Habitat loss and degradation was cited as the primary cause of biodiversity loss.
Cashes Ledge: New England's
Rich Underwater Laboratory
A little over 70 miles off the coast of New England, an unusual undersea mountain range, known as Cashes Ledge, rises from the seabed. Regulators are contemplating lifting a 12-year-old ban on commercial groundfishing in some parts of this area, sparking a roiling debate. What's not in question, however, is that the highest peak in the range, Ammen Rock, teems with kelp forests, sea sponges, and a wide variety of fish and mollusks — much of it captured by ocean photographer Brian Skerry during dives made earlier this year.
View the gallery.
09 Sep 2014:
Ocean Acidification May Dull
Sharks' Ability to Smell Prey, Study Finds
Ocean acidification, which is driven by rising atmospheric carbon dioxide levels, may cause sharks to
Smooth dogfish shark laboratory testing
be less interested in hunting prey, according to
research published in Global Change Biology
. In laboratory experiments emulating CO2 concentrations as they are expected to be by the middle and end of this century, scientists from the U.S. and Australia found that the smooth dogfish shark became uninterested in squid odors — sometimes avoiding them altogether. Sharks in control waters pursued prey scents four times more often than sharks in waters with high CO2 levels, the study found. Rising ocean acidity can disrupt the proper firing of neurons, the scientists say, because it interferes with a specific receptor present in most marine organisms with a nervous system. A study earlier this year found that fish in waters with increased acidity were also less able to detect predator odors.
15 Aug 2014:
New Citizen Science Software
Aims to Document and Curb Illegal Fishing
Citizen scientists can now report — and potentially help stop — illegal fishing
with the snap of a photo thanks to
Illegal shark fin catch
a new smartphone app developed by the Nature Conservancy. The software, called ShipWatch
, was developed this summer during a "Fishackathon," a series of workshops hosted by the U.S. State Department to foster technology development and collaboration among computer programmers. ShipWatch allows users to upload photos of illegal fishing activities to a database, where they are labeled with date and location information and plotted on a central map. The developers hope the data will help authorities enforce existing fishing laws by, for example, developing flight maps for surveillance drones or strategically deploying enforcement authorities. "There are laws in place to say [the fishing] is illegal. The problem is they lack any kind of reporting mechanism," developers told Fast Co.Exist.
07 Aug 2014:
Mercury Pollution in Oceans
Has Tripled Since Industrial Revolution
Globally, oceans contain roughly 60,000 to 80,000 tons of mercury pollution, according to
a report published this week in Nature
detailing the first direct calculation
Ahi tuna has very high mercury concentrations.
of mercury pollution in the world's oceans. Ocean waters shallower than about 300 feet (100 meters) have tripled in mercury concentration since the Industrial Revolution, the study found, and mercury in the oceans as a whole has increased roughly 10 percent over pre-industrial times. North Atlantic waters showed the most obvious signs of mercury pollution, since surface waters there sink to form deeper water flows. In contrast, the tropical and Northeast Pacific were relatively unaffected. "We don't know what that means for fish and marine mammals, but likely that some fish contain at least three times more mercury than 150 years ago," and possibly more, the lead researcher said. "The next 50 years could very well add the same amount we've seen in the past 150."
23 Jul 2014:
Earth Observation Satellites Help
Scientists Understand Global Change
Global warming is affecting more than just atmospheric temperatures — it is also changing water cycles
, soil conditions, and animal migrations. Earth observation satellites aid scientists in measuring and monitoring these changes so societies can better adapt. Although there are well over 1,000 active orbiting satellites, less than 15 percent are used to monitor Earth’s environment. Yale Environment 360
presents a gallery of satellites that scientists are using to better understand how the planet is changing.
View the gallery.