ApocaDocuments (5) matching "ocean warming" from this week
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Sat, Feb 27, 2010
from Science, via DesdemonaDespair:
Pacific Northwest 'dead zone' hypoxic events unprecedented
A review of all available ocean data records concludes that the low-oxygen events which have plagued the Pacific Northwest coast since 2002 are unprecedented in the five decades prior to that, and may well be linked to the stronger, persistent winds that are expected to occur with global warming.
In a new study to be published Friday in the journal Science, researchers from Oregon State University outline a "potential for rapid reorganization" in basic marine ecosystems and the climatic forces that drive them, and suggest that these low-oxygen, or "hypoxic" events are now more likely to be the rule rather than the exception.
"In this part of the marine environment, we may have crossed a tipping point," said Jane Lubchenco... The rapid and disturbing shift of ocean conditions in what has traditionally been one of the world's more productive marine areas -- what's called the California Current Large Marine Ecosystem -- has garnered much attention in recent years, also raising questions about whether it has happened before, and what is causing it.... "At this point, I’d be surprised if this trend towards hypoxic events didn’t continue," Barth said... ...
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Maybe the fish are just hyperventilating and using up the oxygen.
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Thu, Feb 25, 2010
from Oceanography:
A Very Inconvenient Truth (PDF)
Once atmospheric temperature reaches
equilibrium at a certain peak-overall GHG concentration, it will not drop
markedly for the next thousand years
even as GHG concentrations decline.
This irreversibility comes about because
the atmosphere's loss of heat to the ocean
is even more gradual than its loss of CO2. The thermal inertia of the ocean, which
is delaying the rate of climate warming today, will delay the rate of climate
cooling in the future. A crucial point for
policymakers and the public to recognize
is that the global GHG stabilization level
reached during the twenty-first century
will have climatic consequences for the
remainder of the millennium. ...
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I think that means we still have a decade or two to party!
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Thu, Feb 25, 2010
from Scientific American:
Waiting to Inhale: Deep-Ocean Low-Oxygen Zones Spreading to Shallower Coastal Waters
A plague of oxygen-deprived waters from the deep ocean is creeping up over the continental shelves off the Pacific Northwest and forcing marine species there to relocate or die. Since 2002 tongues of hypoxic, or low-oxygen, waters from deeper areas offshore have slipped into shallower near-shore environments off the Oregon coast, although not close enough to be oxygenated by the waves. The problem stems from oxygen reduction in deep water, a phenomenon that some scientists are observing in oceans worldwide, and that may be related to climate change. The hypoxic seawater is distinct from the well-known "dead zones" that form at the mouths of the Mississippi and other rivers around the world. Those areas result from agricultural runoff, which lead to algae blooms that consume oxygen. Rather, the Pacific Northwest problem is broader and more mysterious.
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I LOVE a mystery... um, except this kind.
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Mon, Feb 22, 2010
from USGS, via EurekAlert:
Ice shelves disappearing on Antarctic Peninsula
Ice shelves are retreating in the southern section of the Antarctic Peninsula due to climate change. This could result in glacier retreat and sea-level rise if warming continues, threatening coastal communities and low-lying islands worldwide.
Research by the U.S. Geological Survey is the first to document that every ice front in the southern part of the Antarctic Peninsula has been retreating overall from 1947 to 2009, with the most dramatic changes occurring since 1990. The USGS previously documented that the majority of ice fronts on the entire Peninsula have also retreated during the late 20th century and into the early 21st century.... The Peninsula is one of Antarctica's most rapidly changing areas because it is farthest away from the South Pole, and its ice shelf loss may be a forecast of changes in other parts of Antarctica and the world if warming continues. ...
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I know -- let's geobuild bookends for those shelves!
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Mon, Feb 22, 2010
from Penn State via ScienceDaily:
Diversity of Corals, Algae in Warm Indian Ocean Suggests Resilience to Future Global Warming
Penn State researchers and their international collaborators have discovered a diversity of corals harboring unusual species of symbiotic algae in the warm waters of the Andaman Sea in the northeastern Indian Ocean. "The existence of so many novel coral symbioses thriving in a place that is too warm for most corals gives us hope that coral reefs and the ecosystems they support may persist -- at least in some places -- in the face of global warming," said the team's leader, Penn State Assistant Professor of Biology Todd LaJeunesse. According to LaJeunesse, the comprehensiveness of the team's survey, which also included analysis of the corals and symbiotic algae living in the cooler western Indian Ocean and Great Barrier Reef area of Australia, is unparalleled by any other study. ...
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Sh... Don't tell anyone!
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