Posted by feww on April 29, 2013
SST for the NE Shelf Ecosystem jumped to record 14°C in 2012
Sea surface temperatures (SSTs) in the Northeast Shelf Large Marine Ecosystem during the second half of 2012 hit the highest level in 150 years, according to Northeast Fisheries Science Center (NEFSC).
“These high sea surface temperatures (SSTs) are the latest in a trend of above average temperature seen during the spring and summer seasons, and part of a pattern of elevated temperatures occurring in the Northwest Atlantic, but not seen elsewhere in the ocean basin over the past century,” said the latest NEFSC advisory.
- The temperature rise in 2012 was the highest temperature jump—more than 1°C—ever observed in the time series.
- Average SST was lower than 12.4°C (54.3°F) over the past three decades.
- The Northeast U.S. Continental Shelf Large Marine Ecosystem (LME) extends from the Gulf of Maine to Cape Hatteras, N.C.
The four subregions of the Northeast Shelf Large Marine Ecosystem, which extends from Cape Hatteras, N.C. to the Gulf of Maine. MAB is the Mid-Atlantic Bight, SNE is Southern New England, GB is Georges Bank, and GOM is the Gulf of Maine. Credit: NOAA
The warm water thermal habitat reached a record high during 2012, while cold water habitat dropped to a record low. “Early winter mixing of the water column went to extreme depths, which will impact the spring 2013 plankton bloom. Mixing redistributes nutrients and affects stratification of the water column as the bloom develops,” said the report.
Distributions of fish and shellfish on the Shelf is also affected by temperature. “The four southern species – black sea bass, summer flounder, longfin squid and butterfish – all showed a northeastward or upshelf shift. American lobster has shifted upshelf over time but at a slower rate than the southern species. Atlantic cod and haddock have shifted downshelf.”
“Changes in ocean temperatures and the timing and strength of spring and fall plankton blooms could affect the biological clocks of many marine species, which spawn at specific times of the year based on environmental cues like water temperature,” said a researcher in the NEFSC Ecosystem Assessment Program.
Posted in Global Disaster watch, global disasters, global disasters 2013, Global SST anomalies, Global SST Departures, Sea Surface Temp, Significant Event Imagery, significant events | Tagged: Northeast Continental Shelf, Northeast Shelf Large Marine Ecosystem, Northwest Atlantic, Sea Surface Temperature, sea surface temperature warming, SST trend | Leave a Comment »
Posted by feww on March 18, 2010
The following entry is adopted from a NOAA site. They say their researchers have found clues in stratosphere, troposphere and Arctic Vortex that help them unravel El Niño’s ‘mysteries.’
Unraveling El Niño’s Mysteries: New Clues Found in Stratosphere, Troposphere and Arctic Vortex
El Niño’s emergence in the Pacific Ocean creates ripple effects that extend around the globe.
El Niño (Spanish for “the little boy”) is a natural phenomenon that refers to irregular periods of sea surface temperature warming in the tropical Pacific that impacts global weather patterns.
Supercell. Source NOAA. Click image to enlarge.
El Niño influences our weather: Ocean temperature, air temperature, ocean currents, winds at various altitudes, air pressure … , and its effects are even more complicated by human-caused climate change.
El Niño causes weather chaos across the globe:
- More intense storms in the West Coast of United States, but fewer hurricanes in the Atlantic and Gulf Coast.
- India, southeastern Africa, northern Brazil, and Australia usually experience dramatically drier conditions. Shifts in patterns are even stronger in other parts of the world.
Layers of the atmosphere. Source: NOAA. Click image to enlarge.
El Niño creates highly complex “ripples” that alter atmospheric features from the ocean surface right up to the stratosphere, high above the Earth.
The stratosphere, a layer of the atmosphere beginning about five miles above sea level, influences weather at ground level. The stratospheric layer of the atmosphere is located above the troposphere.
The troposphere begins at the Earth’s surface and extends up to 6-20 km (4-12 miles) high. We occupy this layer. The stratosphere begins above the troposphere and extends up to 50 km above the Earth’s surface. This layer holds 19 percent of the atmosphere’s gases but very little water vapor.
Researchers say they have recently found a connection between another atmospheric feature, swirling upper-level winds called the Arctic vortex, and colder than average winters in Europe. They have found links between three factors that also influence the Arctic vortex:
- El Niño
- Cooling of the tropical stratosphere
- Warming of the Arctic stratosphere
More information on El Niño :
Posted in Arctic vortex, atmosphere, Pacific Ocean, stratosphere, Supercell | Tagged: El Niño, sea surface temperature warming, Tropical Pacific, troposphere, weather chaos | 2 Comments »