PASADENA, Calif. – Boosted by the influence of a larger climate event in the Pacific, one of the strongest La Niñas in many years is slowly weakening but continues to blanket the Pacific Ocean near the equator, as shown by new sea-level height data collected by the U.S.-French Jason oceanographic satellite.
This La Niña, which has persisted for the past year, is indicated by the blue area in the center of the image along the equator. Blue indicates lower than normal sea level (cold water). The data were gathered in early April.
The image also shows that this La Niña is occurring within the context of a larger climate event, the early stages of a cool phase of the basin-wide Pacific Decadal Oscillation. The Pacific Decadal Oscillation is a long-term fluctuation of the Pacific Ocean that waxes and wanes between cool and warm phases approximately every five to 20 years. In the cool phase, higher than normal sea-surface heights caused by warm water form a horseshoe pattern that connects the north, west and southern Pacific, with cool water in the middle. During most of the 1980s and 1990s, the Pacific was locked in the oscillation's warm phase, during which these warm and cool regions are reversed. For an explanation of the Pacific Decadal Oscillation and its present state, see: http://jisao.washington.edu/pdo/ and http://www.esr.org/pdo_index.html .
A La Niña is essentially the opposite of an El Niño. During El Niño, trade winds weaken and warm water occupies the entire tropical Pacific Ocean. Heavy rains tied to the warm water move into the central Pacific Ocean and cause drought in Indonesia and Australia while altering the path of the atmospheric jet stream over North and South America. During La Niña, trade winds are stronger than normal. Cold water that usually sits along the coast of South America is pushed to the middle of the equatorial Pacific. A La Niña changes global weather patterns and is associated with less moisture in the air, and less rain along the coasts of North and South America.
“This multi-year Pacific Decadal Oscillation 'cool' trend can intensify La Niña or diminish El Niño impacts around the Pacific basin," said Bill Patzert, an oceanographer and climatologist at NASA's Jet Propulsion Laboratory, Pasadena, Calif. "The persistence of this large-scale pattern tells us there is much more than an isolated La Niña occurring in the Pacific Ocean."
Sea surface temperature satellite data from the National Oceanic and Atmospheric Administration also clearly show a cool Pacific Decadal Oscillation pattern, as seen at: http://www.cdc.noaa.gov/map/images/sst/sst.anom.gif . The shift in the Pacific Decadal Oscillation, with its widespread Pacific Ocean temperature changes, will have significant implications for global climate. It can affect Pacific and Atlantic hurricane activity, droughts and flooding around the Pacific basin, marine ecosystems and global land temperature patterns.
“The comings and goings of El Niño, La Niña and the Pacific Decadal Oscillation are part of a longer, ongoing change in global climate,” said Josh Willis, a JPL oceanographer and climate scientist. Sea level rise and global warming due to increases in greenhouse gases can be strongly affected by large natural climate phenomenon such as the Pacific Decadal Oscillation and the El Nino-Southern Oscillation. “In fact,” said Willis, “these natural climate phenomena can sometimes hide global warming caused by human activities. Or they can have the opposite effect of accentuating it."
Jason's follow-on mission, the Ocean Surface Topography Mission/Jason-2, is scheduled for launch this June and will extend to two decades the continuous data record of sea surface heights begun by Topex/Poseidon in 1992. JPL manages the U.S. portion of the Jason mission for NASA's Science Mission Directorate, Washington, D.C.
For more information on NASA's ocean surface topography missions, see: http://sealevel.jpl.nasa.gov/ ; or to view the latest Jason data, visit: http://sealevel.jpl.nasa.gov/science/jason1-quick-look/ .
JPL is managed for NASA by the California Institute of Technology in Pasadena.
News Releases: Larger Pacific Climate Event Helps Current La Nina Linger
April 21, 2008
What a classic example of a mind wired shut, Gavin. You have your head so far up your own backside that you didn't bother to even read the link, let alone consider the points made.
Some of Essenhigh's (Prof. Energy Conversion, Ohio State University), conclusions were;
"* the CO2 contribution to the atmosphere from combustion is within the statistical noise of the major sea and vegetation exchanges, so a priori, it cannot be expected to be statistically significant;
* water—as a gas, not a condensate or cloud—is the major radiative absorbing–emitting gas (averaging 95%) in the atmosphere, and not CO2;
* determination of the radiation absorption coefficients identifies water as the primary absorber in the 5.6–7.6-µm water band in the 60–80% RH range; and
* the absorption coefficients for the CO2 bands at a concentration of 400 ppm are 1 to 2 orders of magnitude too small to be significant even if the CO2 concentrations were doubled".
So if the the absorption coefficients for concentrations of 400ppm are 1 or 2 orders of magnitude too small to be significant then there is absolutely no doubt that the first additional 20ppm CO2 that accumulated prior to 1925 had zero impact on global temperatures as I have mentioned in the above posts.
Ergo, any warming prior to 1925 is not a product of CO2 at all, let alone anthropogenic CO2. And any calculation of climate sensitivity to CO2 must be derived from the smaller temperature response of recent times.
A letter SMH 2/05/2008, before it gets lost. {Can't raise a link}: And I hereby salute the author...
Solar power works
From 2002 to 2006 I worked on the design and construction of a prototype of an Australian-developed solar powered collector at Liddell Power Station in the Hunter Valley. The collector,which was originated by the eminent solar scientist Dr David Mills and built from low-cost materials,supplies steam to the existing coal-fired powered station.
This small scale project has demonstrated solar re-powering of the existing coal-fired powered stations. Solar re-powering has the potential to quickly reduce carbon dioxide emissions from existing power stations while creating new jobs in the manufacturing sector.
Every delay in implementing new techologies increases climate change risk to economic growth while emissions grow.
A solar collector at Liddell could replace the day time coal used by the 2000-megawatt station and cut the station's annual carbon dioxide emissions by more than half.
Similar figures apply to other Australian coal-fired power stations, yet so far no government has been prepared to consider this method.
Stephen Bathgate
Pennant Hills
Maybe there's not enough in it for the mates...
Maybe there's another reason....nah
Ian: There is no doubt in my mind, hot coal drives our warming, but a sceptic from the combustion industry is just too much to swallow
How unusual, Gavin off on a totally incoherent tangent. Wonders never cease. Do you have any plans to comment on topic?