Tag Archives: New York Times

Ocean Heat Waves Are Threatening Marine Life

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New York Times, March 4th 2019 –
By Kendra Pierre-Louis and Nadja Popovich

When deadly heat waves hit on land, we hear about them. But the oceans can have heat waves, too. They are now happening far more frequently than they did last century and are harming marine life, according to a new study.


The average number of marine heat wave days for the period 1987-2016, compared to the average for 1925-1954. Orange-red range indicates 18-36+ more marine heat wave days compared to the mid-20th century.
Source: Nature Climate Change | By The New York Times

The study, published Monday in the journal Nature Climate Change, looked at the impact of marine heat waves on the diversity of life in the ocean. From coral reefs to kelp forests to sea grass beds, researchers found that these heat waves were destroying the framework of many ocean ecosystems.

Marine heat waves are said to occur when sea temperatures are much warmer than normal for at least five consecutive days.

Scientists estimate that the oceans have absorbed more than 90 percent of the heat trapped by excess greenhouse gases since midcentury. Humans have added these gases to the atmosphere largely by burning fossil fuels, like coal and natural gas, for energy.


An estimated one billion people depend on coral reefs, which are highly sensitive to temperature, for food or income. Credit Gabriel Barathieu/Biosphoto/Minden Pictures

Bleached coral in Kaneohe Bay off Oahu, Hawaii. Credit Caleb Jones/AP

An earlier study by some of the same researchers found that, from 1925 to 2016, marine heat waves became, on average, 34 percent more frequent and 17 percent longer. Over all, there were 54 percent more days per year with marine heat waves globally.

The most severe years tended to be El Niño years. Warmer ocean temperatures are one of the characteristics of an El Niño pattern.

“There’s also some indication that El Niños have been getting more extreme with climate change,” said Eric C. J. Oliver, an assistant professor of physical oceanography at Dalhousie University in Halifax, Nova Scotia, who was a co-author of the study. But regional marine heat waves can happen even without an El Niño, he said.

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Our Deadened, Carbon-Soaked Seas

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The New York Times, October 15th, 2015,

By Richard W. Spinrad and Ian Boyd

Ocean and coastal waters around the world are beginning to tell a disturbing story. The seas, like a sponge,

nytimes oa picare absorbing increasing amounts of carbon dioxide from the atmosphere, so much so that the chemical balance of our oceans and coastal waters is changing and a growing threat to marine ecosystems. Over the past 200 years, the world’s seas have absorbed more than 150 billion metric tons of carbon from human activities. Currently, that’s a worldwide average of 15 pounds per person a week, enough to fill a coal train long enough to encircle the equator 13 times every year.

We can’t see this massive amount of carbon dioxide that’s going into the ocean, but it dissolves in seawater as carbonic acid, changing the water’s chemistry at a rate faster than seen for millions of years. Known as ocean acidification, this process makes it difficult for shellfish, corals and other marine organisms to grow, reproduce and build their shells and skeletons.

About 10 years ago, ocean acidification nearly collapsed the annual $117 million West Coast shellfish industry, which supports more than 3,000 jobs. Ocean currents pushed acidified water into coastal areas, making it difficult for baby oysters to use their limited energy to build protective shells. In effect, the crop was nearly destroyed.

Human health, too, is a major concern. In the laboratory, many harmful algal species produce more toxins and bloom faster in acidified waters. A similar response in the wild could harm people eating contaminated shellfish and sicken, even kill, fish and marine mammals such as sea lions.

Increasing acidity is hitting our waters along with other stressors. The ocean is warming; in many places the oxygen critical to marine life is decreasing; pollution from plastics and other materials is pervasive; and in general we overexploit the resources of the ocean. Each stressor is a problem, but all of them affecting the oceans at one time is cause for great concern. For both the developing and developed world, the implications for food security, economies at all levels, and vital goods and services are immense.

This year, the first nationwide study showing the vulnerability of the $1 billion U.S. shellfish industry to ocean acidification revealed a considerable list of at-risk areas. In addition to the Pacific Northwest, these areas include Long Island Sound, Narragansett Bay, Chesapeake Bay, the Gulf of Mexico, and areas off Maine and Massachusetts. Already at risk are Alaska’s fisheries, which account for nearly 60 percent of the United States commercial fish catch and support more than 100,000 jobs.

Ocean acidification is weakening coral structures in the Caribbean and in cold-water coral reefs found in the deep waters off Scotland and Norway. In the past three decades, the number of living corals covering the Great Barrier Reef has been cut in half, reducing critical habitat for fish and the resilience of the entire reef system. Dramatic change is also apparent in the Arctic, where the frigid waters can hold so much carbon dioxide that nearby shelled creatures can dissolve in the corrosive conditions, affecting food sources for indigenous people, fish, birds and marine mammals. Clear pictures of the magnitude of changes in such remote ocean regions are sparse. To better understand these and other hotspots, more regions must be studied.

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Putting a Price Tag on Nature’s Defenses

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June 5th, 2014, By Carl Zimmer, The New York Times

After Hurricane Katrina devastated New Orleans, the United States Army Corps of Engineers got to work on a massive network of levees and flood walls to protect against future catastrophes. Finally completed in 2012, the project ended up costing $14.5 billion — and that figure didn’t include the upkeep these defenses will require in years to come, not to mention the cost of someday replacing them altogether.

But levees aren’t the only things that protect coasts from storm damage. Nature offers protection, too. Coastal marshes absorb the wind energy and waves of storms, weakening their impact farther inland. And while it’s expensive to maintain man-made defenses, wetlands rebuild themselves.

Coral reefs have proved valuable to coastal regions by helping to blunt shore erosion from storm waves. - Reuters

Coral reefs have proved valuable to coastal regions by helping to blunt shore erosion from storm waves. – Reuters

Protection from storms is just one of many services that ecosystems provide us — services that we’d otherwise have to pay for. In 1997, a team of scientists decided to estimate how much they are actually worth. Worldwide, they concluded, the price tag was $33 trillion — equivalent to $48.7 trillion in today’s dollars. Put another way, the services ecosystems provide us — whether shielding us from storms, preventing soil erosion or soaking up the greenhouse gases that lead to global warming — were twice as valuable as the gross national product of every country on Earth in 1997.

“We basically said, ‘It’s an imprecise estimate, but it’s almost definitely a pretty big number, and we’ve got to start paying attention,’” said Robert Costanza, a professor at Australian National University who led the study.

That study proved to be hugely influential. Many governments, from Costa Rica to the United Kingdom, started to take the value of ecosystem services into account when they planned environmental policies. But the study also set off a lot of controversy. Some economists argued that it was based on bad economics, while some conservation biologists argued that price tags were the wrong way to save ecosystems.

Seventeen years later, the debate is getting re-energized, just as the nation becomes immersed in an intense fight over the Obama administration’s attempt to tackle the emissions that scientists say could threaten many of these ecosystems. Dr. Costanza and his colleagues have now updated the 1997 estimate in a new study, published in the May issue of the journal Global Environmental Change, and concluded that the original estimate was far too low. The true value of the services of the world’s ecosystems is at least three times as high, they said.

“As we learn more, these estimates increase,” Dr. Costanza said.

That’s putting it mildly. The enormous rise in the price tag stems from hundreds of new studies carried out on ecosystems around the world. Taken as a whole, these studies reveal that ecosystems do more for us than Dr. Costanza and his colleagues could appreciate in 1997.

Coral reefs, for instance, have proved to be much more important for storm protection than previously recognized. They also protect against soil erosion by weakening waves before they reach land. As a result, Dr. Costanza and his colleagues now consider the services provided by coral reefs to be 42 times more valuable than they did in 1997. They estimate that each acre of reef provides $995,000 in services each year for a total of $11 trillion worldwide.

 Most of the 17 services that Dr. Costanza and his colleagues analyzed in 16 different kinds of ecosystems — including tropical forests, mangroves and grasslands — also turned out to be more valuable. When they added up all their new figures, they came up with a global figure of $142.7 trillion a year (in 2014 dollars).

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