The Ocean’s Carbon Balance

From NASA’s Earth Observatory:

by Holli Riebeek • design by Robert Simmon • June 30, 2008

[WARNING: Beware of booby traps!]

The idea seemed simple enough: the more carbon dioxide that people pumped into the atmosphere by burning fossil fuels, the more the oceans would absorb. The ocean would continue to soak up more and more carbon dioxide until global warming heated the ocean enough to slow down ocean circulation. Water trapped at the surface would become saturated, at which point, the ocean would slow its carbon uptake. To oceanographers of 30 years ago, the question was less, how will human emissions change the ocean carbon cycle, and more, is the ocean carbon cycle changing yet?

One of the largest unknowns in our understanding of the greenhouse effect is the role of the oceans as a carbon sink. Much of the carbon dioxide released into the atmosphere by the burning of fossil fuels is soaked up by the oceans, but changes in the climate are altering this absorption in surprising ways. (Photograph ©2007 *Fede*.)
.

The question matters because if the ocean starts to take up less carbon because of global warming, more is left in the atmosphere where it can contribute to additional warming. Scientists wanted to understand how the ocean carbon cycle might change so that they could make more accurate predictions about global warming. Thus motivated, oceanographers began a series of research cruises, trolling across the Pacific from Japan to California, from Alaska to Hawaii, and through the North Atlantic from Europe to North America. On shore, others developed computer models.

For more than 30 years, research ships have cruised the world’s oceans, measuring carbon dioxide concentrations, ocean temperatures, winds, and other properties. The map shows the paths of research cruises conducted as part of the World Climate Research Programme’s Climate Variability and Predictability project. Cruise measurements—along with those from buoys, drifting floats, orbiting satellites, and land-based weather stations—are beginning to reveal long-term trends to ocean researchers. (Map by Robert Simmon, based on data from Dana Greeley, NOAA.)

After 30 years of research, the question itself hasn’t changed, but the reasoning behind it couldn’t be more different. Oceanographers started out wanting to know if the ocean was keeping up with the amount of carbon dioxide people are putting into the atmosphere. Instead, they found that people aren’t the only players changing the ocean carbon cycle. Over decades, natural cycles in weather and ocean currents alter the rate at which the ocean soaks up and vents carbon dioxide. What’s more, scientists are beginning to find evidence that human-induced changes in the atmosphere also change the rate at which the ocean takes up carbon. In other words, it turns out that the world is not a simple place. More …

For eons, the world’s oceans have been sucking carbon dioxide out of the atmosphere and releasing it again in a steady inhale and exhale. The ocean takes up carbon dioxide through photosynthesis by plant-like organisms (phytoplankton), as well as by simple chemistry: carbon dioxide dissolves in water. It reacts with seawater, creating carbonic acid. Carbonic acid releases hydrogen ions, which combine with carbonate in seawater to form bicarbonate, a form of carbon that doesn’t escape the ocean easily.

As we burn fossil fuels and atmospheric carbon dioxide levels go up, the ocean absorbs more carbon dioxide to stay in balance. But this absorption has a price: these reactions lower the water’s pH, meaning it’s more acidic. And the ocean has its limits. As temperatures rise, carbon dioxide leaks out of the ocean like a glass of root beer going flat on a warm day. Carbonate gets used up and has to be re-stocked by upwelling of deeper waters, which are rich in carbonate dissolved from limestone and other rocks.

In the center of the ocean, wind-driven currents bring cool waters and fresh carbonate to the surface. The new water takes up yet more carbon to match the atmosphere, while the old water carries the carbon it has captured into the ocean.

The warmer the surface water becomes, the harder it is for winds to mix the surface layers with the deeper layers. The ocean settles into layers, or stratifies. Without an infusion of fresh carbonate-rich water from below, the surface water saturates with carbon dioxide. The stagnant water also supports fewer phytoplankton, and carbon dioxide uptake from photosynthesis slows. In short, stratification cuts down the amount of carbon the ocean can take up.

The rest of this feature article is available at: The Ocean’s Carbon Balance

Related Links:

• Southern Ocean already losing ability to absorb CO₂
• Oceans, Where Life Started, Are Dying – Part IV :  Researchers found evidence of corrosive water about 20 miles off the west coast of North America from Canada to Mexico.
• Human carbon emissions make oceans corrosive : ‘Carbon dioxide spewed by human activities has made ocean water so acidic that it is eating away at the shells and skeletons of starfish, coral, clams and other sea creatures …’
• The Eight Steps that Help Kill More of Our Fish : How Your Car’s Exhaust Emissions Helps Create Dead Zones and Kill Our Fish.
• Global warming could starve oceans of oxygen: study : Areas of the eastern Atlantic and Pacific Oceans with low amounts of dissolved oxygen have expanded in the past 50 years, apparently in line with rising temperatures.
• The Floating Toxic Garbage Island : A patch of garbage twice as large as the continental United States and dubbed the Great Pacific Garbage Patch floats in the middle of the Pacific Ocean in North Pacific Gyre.
• Oceans, Where Life Started, Are Dying – Part III : Tourism: The Most Destructive Human Activity After Warfare
• Oceans, Where Life Started, Are Dying – Part II : Major Problems: Fertilizer Runoff; Tourism; Coastal Developments [and Ocean Warming due to climate change]
• Oceans, Where Life Started, Are Dying – Part I : Our Oceans Are Now Dying!

Australian barley chemically contaminated

Japan detects pesticides in Australian barley imports

Japanese government suspended purchase of Australian barley after detecting two insecticide ingredients three times the legal standards for residual pesticides.

The high levels of amitraz and fipronil, used to exterminate insects, were found by Mitsubishi Trading co., which imported the grains, at the request of the Ministry of Agriculture, Forestry and Fisheries.

“The farm ministry learned that the two substances are banned for use on barley in Australia. It plans to investigate with the Australian government why the chemicals were used on the grain.” Asahi reported. (Source)

It’s not known whether the Japanese officials test New Zealand wine and farm produce for dangerous chemicals.

Related Links:

• Penguins DDT Contamination Levels Still High
• Who’s Afraid of Compound 1080?
• Emergency Health Warnings: Toxic Honey Poisoning
• Emergency Warning to Tourists Visiting New Zealand
• 1080

• Don’t Take the Kids To New Zealand
• Truth About ‘100% Pure New Zealand’
• The Poisoning of New Zealand

• Hermaphrodite Lamb Born With Seven Legs
• Toxic Sludge
• Toxic Country – Diseased Food
• 1080
• NZ indiscriminate aerial applications of the potent poison 1080

::

Tipping Point: Here and Now!

Our thanks to Lisa G. for forwarding the link to the following (Source)

We are at the tipping point because the climate state includes large, ready positive feedbacks provided by the Arctic sea ice, the West Antarctic ice sheet, and much of Greenland’s ice. — James Hansen

Tipping Point: PERSPECTIVE OF A CLIMATOLOGIST [PDF]
by JAMES HANSEN

An Excerpt from Hansen’s report:
Our home planet is dangerously near a tipping point at which human-made greenhouse gases reach a level where major climate changes can proceed mostly under their own momentum. Warming will shift climatic zones by intensifying the hydrologic cycle, affecting freshwater availability and human health.

[James Hansen is director of the National Aeronautics and Space Administration Goddard Institute for Space Studies and an Adjunct Professor of Earth and Environmental Sciences at Columbia University’s Earth Institute.]

The ice in the Arctic is much younger than normal, with vast regions now covered by first-year ice and much less area covered by multiyear ice. Left: February distribution of ice by its age during normal Arctic conditions (1985-2000 average). Right: February 2008 Arctic ice age distribution. Credit: NSIDC [Caption: NASA]

Related Links:

• Arctic sea ice forecast:another record low in 2008
• Arctic Melting FAST!
• Greenland Ice Melt Faster Than IPCC Estimates
• Only Zero Emissions Would Avert Dangerous Warming
• Stern Report: “a great toxic dump of doublespeak in truly Orwellian fashion”

• Burning Earth
• Human Impact
• The First Wave of World’s Collapsing Cities
• Giga Trends
• Nuking Earth for Lifestyle

.-.

World Oceans in Extreme Danger

Project Censored:
Top 25 Censored News Stories of 2007

Oceans of the World in Extreme Danger

Source: Mother Jones, March /April, 2006
Title: The Fate of the Ocean
Author: Julia Whitty

Oceanic problems once found on a local scale are now pandemic. Data from oceanography, marine biology, meteorology, fishery science, and glaciology reveal that the seas are changing in ominous ways. A vortex of cause and effect wrought by global environmental dilemmas is changing the ocean from a watery horizon with assorted regional troubles to a global system in alarming distress.

According to oceanographers the oceans are one, with currents linking the seas and regulating climate. Sea temperature and chemistry changes, along with contamination and reckless fishing practices, intertwine to imperil the world’s largest communal life source.

In 2005, researchers from the Scripps Institution of Oceanography and the Lawrence Livermore National Laboratory found clear evidence the ocean is quickly warming. They discovered that the top half-mile of the ocean has warmed dramatically in the past forty years as a result of human-induced greenhouse gases.

One manifestation of this warming is the melting of the Arctic. A shrinking ratio of ice to water has set off a feedback loop, accelerating the increase in water surfaces that promote further warming and melting. With polar waters growing fresher and tropical seas saltier, the cycle of evaporation and precipitation has quickened, further invigorating the greenhouse effect. The ocean’s currents are reacting to this freshening, causing a critical conveyor that carries warm upper waters into Europe’s northern latitudes to slow by one third since 1957, bolstering fears of a shut down and cataclysmic climate change. This accelerating cycle of cause and effect will be difficult, if not impossible, to reverse.

Atmospheric litter is also altering sea chemistry, as thousands of toxic compounds poison marine creatures and devastate propagation. The ocean has absorbed an estimated 118 billion metric tons of carbon dioxide since the onset of the Industrial Revolution, with 20 to 25 tons being added to the atmosphere daily. Increasing acidity from rising levels of CO2 is changing the ocean’s PH balance. Studies indicate that the shells and skeletons possessed by everything from reef-building corals to mollusks and plankton begin to dissolve within forty-eight hours of exposure to the acidity expected in the ocean by 2050. Coral reefs will almost certainly disappear and, even more worrisome, so will plankton. Phytoplankton absorb greenhouse gases, manufacture oxygen, and are the primary producers of the marine food web.

Mercury pollution enters the food web via coal and chemical industry waste, oxidizes in the atmosphere, and settles to the sea bottom. There it is consumed, delivering mercury to each subsequent link in the food chain, until predators such as tuna or whales carry levels of mercury as much as one million times that of the waters around them. The Gulf of Mexico has the highest mercury levels ever recorded, with an average of ten tons of mercury coming down the Mississippi River every year, and another ton added by offshore drilling.

Along with mercury, the Mississippi delivers nitrogen (often from fertilizers). Nitrogen stimulates plant and bacterial growth in the water that consume oxygen, creating a condition known as hypoxia, or dead zones. Dead zones occur wherever oceanic oxygen is depleted below the level necessary to sustain marine life. A sizable portion of the Gulf of Mexico has become a dead zone—the largest such area in the U.S. and the second largest on the planet, measuring nearly 8,000 square miles in 2001. It is no coincidence that almost all of the nearly 150 (and counting) dead zones on earth lay at the mouths of rivers. Nearly fifty fester off U.S. coasts. While most are caused by river-borne nitrogen, fossil fuel-burning plants help create this condition, as does phosphorous from human sewage and nitrogen emissions from auto exhaust.

Meanwhile, since its peak in 2000, the global wild fish harvest has begun a sharp decline despite progress in seagoing technologies and intensified fishing. So-called efficiencies in fishing have stimulated unprecedented decimation of sealife. Long-lining, in which a single boat sets line across sixty or more miles of ocean, each baited with up to 10,000 hooks, captures at least 25 percent unwanted catch. With an estimated 2 billion hooks set each year, as much as 88 billion pounds of life a year is thrown back to the ocean either dead or dying. Additionally, trawlers drag nets across every square inch of the continental shelves every two years. Fishing the sea floor like a bulldozer, they level an area 150 times larger than all forest clearcuts each year and destroy seafloor ecosystems. Aquaculture is no better, since three pounds of wild fish are caught to feed every pound of farmed salmon. A 2003 study out of Dalhousie University in Nova Scotia concluded, based on data dating from the 1950s, that in the wake of decades of such onslaught only 10 percent of all large fish (tuna, swordfish) and ground fish (cod, hake, flounder) are left anywhere in the ocean.

Other sea nurseries are also threatened. Fifteen percent of seagrass beds have disappeared in the last ten years, depriving juvenile fish, manatees, and sea turtles of critical habitats. Kelp beds are also dying at alarming rates.

While at no time in history has science taught more about how the earth’s life-support systems work, the maelstrom of human assault on the seas continues. If human failure in governance of the world’s largest public domain is not reversed quickly, the ocean will soon and surely reach a point of no return.

Comment:
After release of the Pew Oceans Commission report, U.S. media, most notably The Washington Post and National Public Radio in 2003 and 2004, covered several stories regarding impending threats to the ocean, recommendations for protection, and President Bush’s response. However, media treatment of the collective acceleration of ocean damage and cross-pollination of harm was left to Julia Whitty in her lengthy feature. In April of 2006, Time Magazine presented an in-depth article about earth at “the tipping point,” describing the planet as an overworked organism fighting the consequences of global climate change on shore and sea. In her Mother Jones article, Whitty presented a look at global illness by directly examining the ocean as earth’s circulatory, respiratory, and reproductive system.

Following up on “The Last Days of the Ocean,” Mother Jones has produced “Ocean Voyager,” an innovative web-based adventure that includes videos, audio interviews with key players, webcams, and links to informative web pages created by more than twenty organizations. The site is a tour of various ocean trouble spots around the world, which highlights solutions and suggests actions that can be taken to help make a difference.

UPDATE BY JULIA WHITTY
This story is awash with new developments. Scientists are currently publishing at an unprecedented rate their observations—not just predictions—on the rapid changes underway on our ocean planet. First and foremost, the year 2005 turned out to be the warmest year on record. This reinforces other data showing the earth has grown hotter in the past 400 years, and possibly in the past 2,000 years. A study out of the National Center for Atmospheric Research found ocean temperatures in the tropical North Atlantic in 2005 nearly two degrees Fahrenheit above normal; this turned out to be the predominant catalyst for the monstrous 2005 hurricane season—the most violent season ever seen.

The news from the polar ice is no better. A joint NASA/University of Kansas study in Science (02/06) reveals that Greenland’s glaciers are surging towards the sea and melting more than twice as fast as ten years ago. This further endangers the critical balance of the North Atlantic meridional overturning circulation, which holds our climate stable. Meanwhile, in March, the British Antarctic Survey announced their findings that the “global warming signature” of the Antarctic is three times larger than what we’re seeing elsewhere on Earth—the first proof of broadscale climate change across the southern continent.

Since “The Fate of the Ocean” went to press in Mother Jones magazine, evidence of the politicization of science in the global climate wars has also emerged. In January 2006 NASA’s top climate scientist, James Hansen, accused the agency of trying to censor his work. Four months later, Hansen’s accusations were echoed by scientists at the National Oceanic and Atmospheric Administration, as well as by a U.S. Geological Survey scientist working at a NOAA lab, who claimed their work on global climate change was being censored by their departments, as part of a policy of intimidation by the anti-science Bush administration.

Problems for the ocean’s wildlife are escalating too. In 2005, biologists from the U.S. Minerals Management Service found polar bears drowned in the waters off Alaska, apparent victims of the disappearing ice. In 2006, U.S. Geological Survey Alaska Science Center researchers found polar bears killing and eating each other in areas where sea ice failed to form that year, leaving the bears bereft of food. In response, the International Union for the Conservation of Nature and Natural Resources revised their Red List for polar bears—upgrading them from “conservation dependent” to “vulnerable.” In February, the U.S. Fish and Wildlife Service announced it would begin reviewing whether polar bears need protection under the Endangered Species Act.

Since my report, the leaders of two influential commissions—the Pew Oceans Commission and the U.S. Commission on Ocean Policy—gave Congress, the Bush administration, and our nation’s governors a “D+” grade for not moving quickly enough to address their recommendations for restoring health to our nation’s oceans.

Most of these stories remain out of view, sunk with cement boots in the backwaters of scientific journals. The media remains unable to discern good science from bad, and gives equal credence to both, when they give any at all. The story of our declining ocean world, and our own future, develops beyond the ken of the public, who forge ahead without altering behavior or goals, and unimpeded by foresight.

Fair Use Statement

Related Link: Project Censored (!)