Publicado por: pongpesca | 2010/07/02

TerraDaily: vários

The latest data from the NASA/European Ocean Surface Topography Mission/Jason-2 satellite show that the tropical Pacific has switched from warm, or higher-than-normal sea surface heights (shown in red) to cold, or lower-than-normal sea surface heights (shown in blue) during the last few months. Image Credit: NASA/JPL Ocean Surface Topography Team

Adios El Nino, Hello La Nina – 23 de Junho de 2010

The latest image of Pacific Ocean sea surface heights from the NASA/European Ocean Surface Topography Mission/Jason-2 oceanography satellite, dated June 11, 2010, shows that the tropical Pacific has switched from warm (red) to cold (blue) during the last few months.

Despite numerous technological advances over the last several decades, ship-based surveys remain the only method for obtaining high-quality observations of a suite of physical, chemical and biological parameters over the full water column, especially for the deep ocean below two kilometres (52 per cent of global ocean volume).

Deep Thinking On The World’s Oceans – 28 de Junho de 2010

The world’s deep ocean researchers – scientists whose field of interest extends into the uncertain world below about 2000 metres – met in Hobart this week to discuss deep ocean changes, their causes and their implications.

Study: Some reefs adapt to global warming – 23 de Junho de 2010

A U.S.-led international team of scientists says it has discovered why some coral reefs can better adapt to global warming than others.

Global ocean pH and chemical saturation states are changing at an “unprecedented” rate, 30 to 100 times faster than temporal changes in the recent geological past, “and the perturbations will last many centuries to millennia.”

Scientist Takes Comprehensive Look At Human Impacts On Ocean Chemistry – 22 de Junho de 2010

Numerous studies are documenting the growing effects of climate change, carbon dioxide, pollution and other human-related phenomena on the world’s oceans. But most of those have studied single, isolated sources of pollution and other influences.

“Recent studies, however, have cast doubt on our ability to describe this overturning as a conveyor belt. From these studies we now understand that the overturning waters are not restricted to narrow boundary currents, that the overturning may vary from one ocean basin to the next and that the winds may create variability in the amount of water that overturns and in the pathways for the upper and lower limbs of the overturning.”

Retooling The Ocean Conveyor Belt – 22 de Junho de 2010

For decades, oceanographers have embraced the idea that Earth’s ocean currents operate like a giant conveyor belt, overturning to continuously transport deep, cold polar waters toward the equator and warm equatorial surface waters back toward the poles along narrow boundary currents.

Fonte: TerraDaily

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