Saturday, July 29, 2006
Friday, July 28, 2006
Scientists: Warming triggers 'dead zone'
GRANTS PASS, Ore. - Bottom fish and crabs washing up dead on Oregon beaches are being killed by a recurring "dead zone" of low-oxygen water that appears to be triggered by global warming, scientists say.
The area is larger and more deadly than in past years, and there are signs it is spreading north to Washington's Olympic Peninsula.
Scientists studying a 70-mile-long zone of oxygen-depleted water along the Continental Shelf between Florence and Lincoln City have concluded it is being caused by explosive blooms of tiny plants known as phytoplankton, which die and sink to the bottom.
The phytoplankton are eaten by bacteria, which use up the oxygen in the water. The recurring phytoplankton blooms are triggered by north winds generating a rollover of the water column in a process known as upwelling.
"We are seeing wild swings from year to year in the timing and duration of the winds that are favorable for upwelling," Jane Lubchenco, professor of marine ecology at Oregon State and a member of the Pew Oceans Commission, said from Corvallis. "This increased variability in the winds is consistent with what we would expect under climate change."
Tuesday, July 25, 2006
Drought-stricken Australia considers drinking recycled sewage
July hottest month in Netherlands in 300 years
AMSTERDAM (Reuters) - July 2006 is on track to be the hottest month in the Netherlands since temperatures were first measured in 1706, the Dutch meteorological institute KNMI said on Tuesday.
Average daily temperatures in the first 24 days of July were a record of 22.3 degrees Celsius (72.14F) compared with the previous record of 21.4 degrees in July 1994 and normal average temperatures of 17.4, the KNMI said.
"July 2006 is the hottest month ever," it said in a statement.
Dutch temperature records, launched in the beginning of the 18th century, are among the oldest in the world. Methodical thermometer-based records began on a more global basis around 1850.
Dutch meteorologists say they cannot make a direct link between global warming and the heatwave in Europe, although the KNMI has forecast a clear warming trend in the next 50 years and an increasing number of heatwaves.
Temperatures in the Netherlands rose as high as 36-37 degrees last week, when two people died during a walking event which was later canceled.
Monday, July 24, 2006
Saturday, July 22, 2006
Warmer waters disrupt Pacific food chain
Scientists blame changes in West Coast climate patterns for a delay in the seasonal upwelling of cold, nutrient-rich waters from the ocean's depths for the second year in a row. Weak winds and faltering currents have left the Gulf of the Farallones without krill, on which Cassin's auklets and a variety of other seabirds, fish and mammals depend for food.
Friday, July 21, 2006
Sunday, July 16, 2006
States brace for continued heat wave
Saturday, July 15, 2006
Scorching U.S.: First Half of 2006 Sets Heat Record
Temperatures for January through June were 3.4 degrees Fahrenheit above the 20th-century average.
Texas, Oklahoma, Kansas, Nebraska and Missouri experienced record warmth for the period, while no state experienced cooler-than-average temperatures, reported scientists from NOAA's National Climatic Data Center in Asheville, N.C. [Heat Map]
Scientists have previously said that 2005 was the warmest year on record for the entire globe.
Thursday, July 13, 2006
Killer salinity rings Australia's desert heart
Wednesday, July 12, 2006
Trees in Antarctic
SYDNEY (AFP) - Trees could be growing in the Antarctic within a century because of global warming, an international scientific conference heard.
With carbon dioxide levels in the atmosphere set to double in the next 100 years, the icy continent could revert to how it looked about 40 million years ago, said Professor Robert Dunbar of Stanford University.
"It was warm and there were bushes and there were trees," he told some 850 delegates in the Tasmanian capital Hobart, the national AAP news agency reported.
The delegates are attending the combined meetings of the Scientific Committee on Antarctic Research and the Council of Managers of National Antarctic Programs.
Dunbar said climate experts were predicting a doubling of the levels of carbon dioxide by 2100, "but it actually looks like it's going to come sooner unfortunately."
Scientists blame greenhouse gases such as carbon dioxide, produced mainly by the burning of fossil fuels such as coal and oil, for causing rising temperatures worldwide.
Tuesday, July 11, 2006
Greenland's glaciers
Scientists studying Greenland's glaciers say seasonal melting has increased, and was greater last year than at any time in almost three decades.
When the glaciers are in equilibrium, spring melting matches the added winter snow. But the glaciers have been shrinking with higher temperatures.
Jay Zwally, a glaciologist with the National Aeronautics and Space Administration, observed from a plane as he headed home on his most recent research trip that six miles of the Jakobshavn Glacier had fallen into the fjord, The Los Angeles Times reported.
The glacier is the largest of the rivers of ice that flow out of the Greenland ice cap.
Studies of ice cores from Greenland have found a history of sudden climate shifts with average temperatures rising as much as 15 degrees in a decade.
Total melting of the Greenland ice cap would raise sea levels worldwide about 21 feet, although even with continued rising temperatures its total disappearance would take hundreds or even thousands of years, the newspaper said.Environment: Global warming a major threat
"Ocean chemistry, pH, is changing and will continue to change as long as CO2 emissions are increasing. That is not debatable," said Joan Kleypas of the National Center for Atmospheric Research.
The second report, published Thursday in the journal Science, found the increase in the number of large Western wildfires in recent years "another part of a chain of reactions to climate warming."
Monday, July 10, 2006
Fewer Fish Leads to Jellyfish Explosion
Now with some hard data in hand, scientists are calling it a jellyfish explosion.
Overfishing and climate change might both contribute to the phenomenon. Jellyfish have few predators, the scientists say, so if fish are depleted and nutrients are available, the jellyfish do quite well.
Thursday, July 06, 2006
Monday, July 03, 2006
Global warming affecting Scottish birds?
Generally, the declining species are those of higher elevations, the Scottish moors and uplands. Kestrels, lapwings, curlews, meadow pipits and oyster catchers have been placed on the amber warning list.
Numbers of swifts and hooded crows have dropped by more than one-third, the survey found. But because their declines have been observed over a relatively short time they have not yet been put on the warning list.