Why on Earth have a stubborn cold spot cooling


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The Earth is relentlessly heating. So it’s strange that there is a persistent”cold blob”in the Atlantic Ocean.

The cold blob(aka”warming hole”)is like a clear pimple, it is readily apparent that in the recent NASA surface temperature map. As a whole, the ocean surface has risen by nearly 2 degrees Celsius(1 degree Celsius)since 1900 as the oceans continuously absorb a large number of human created heat. But the ocean surface temperature in the North Atlantic warming hole is located in Greenland, Cooling Reach 1. 6 degrees Fahrenheit(or 0. 9C)during this period, then the cold air on this cold patch of ocean.

The study, published Monday in the journal Nature Climate ChangeProvides more evidence for how changes in the warming ocean has sustainable this impressive firm cold blob. This is an unusual phenomenon, but as a human adds more heat in the Earth’s Climate System, year after year, the inevitable consequences, some more obvious or expected, some surprising.

“Man-made climate change has changed the circuit of the climate system,”said Professor Karnauskas, an oceanographer at the University of Colorado, Boulder who had no role in the study. “(The blob)is an interesting manifestation of the risk we take in.”

(There is growing evidence of a dangerous future, including a megadrought in the United States, the rapid disappearance of sea ice, extreme storms, relentless global heating, a surging wildfire, and beyond.)

Persistent blob has been particularly prominent, because in 2015, includes five of the hottest years on record for the globe. “The North Atlantic public marches to its own drummer,”said Joe Willis, NASA oceanographer who has no role in the study. And one of the key features from this new research, Willis stressed that there may be some mechanisms driving the unique warming of the cave.

Here they are:

1. Changing ocean currents

There is increasing evidence that this study further supports that a major ocean current called the”Atlantic meridional overturning circulation(accumulation)—which acts a bit like a conveyor belt, because it transports warm tropical water into the North Atlantic Ocean—is slow down. Scientists suspect the slowdown is by”the chart”melting of the Greenland ice sheet caused by freshwater influx to the North Atlantic Ocean.

Water inflows can have an important role. It reduces the salinity of the ocean, which makes water less dense. This will throw a wrench in the ocean circulation: now, the little cold water in the North Atlantic natural sedimentation, which hinders the flow of new tropical warm from flowing into this Ocean region(because of the cooler waters, now more active, there is no clear way). Ultimately, this means less heat with disabilities into the North Atlantic, which helps to maintain the cold blob, said Paul Keil, the lead author of the study and PhD candidate Max Planck Institute for Meteorology in Germany.

Oceanographers expect the accumulation of slow freshwater, the new melt in a rapidly warming Arctic region, injected into the North Atlantic. Persistent cold blob provides compelling evidence already happening. “The accumulation is expected to slow down, as a response to increasing greenhouse gases in the atmosphere,”said Daniel Hewitt, an oceanographer at the National Center for Atmospheric Research who also had no role in the study.

More importantly, Kyle and his team found that a circulation of the water vehicle in the surrounded by the North Atlantic itself, known as the”subpolar gyre”has been sent to the heat Out This area. The loop flow, circulating in the counterclockwise direction, relatively warm waters farther North, into the Arctic Ocean. This is a deeply complex system, Keil said, noting his team are preparing a completely independent study focusing just on what is driving this circulation(the study is by Roy Ghosh, who also studies marine trends at the Max Planck Institute for Meteorology.)

The important point is that such a vortex acts to transport warm waters of the North Atlantic, further cooling the cold blob.

“Therefore, the heat of Major General, the more heat will be out,”explains Keil.

2. Cloud

Studies have also shown that clouds play a role, although small, in maintaining the cold blob.

They found a relatively cool ocean surface produce more low level clouds type of thick and”reflects more sunlight, thus further cooling the surface,”said Kyle. This means that the warming hole is the”strengthening”itself in a feedback loop, the interpretation of Keil, because the more the cooling caused by more clouds in the reflection, thus creating more cooling.

The role of the cloud in the North Atlantic, however, a new, emerging discoveries will certainly need to continue to observe, said NASA’s Willis.

The global surface temperature is higher than the average over the years 2015 though 2019.

The global surface temperature is higher than the average over the years 2015 though 2019.

The cold blob in 2015.

The cold blob in 2015.

It is important to note that conditions in the North Atlantic are very different, from year to year and through the span of ten years. Figure out the role of the rapid heating of the climate to maintain a cold blob, Kyle and his team used advanced computer simulations, (Max-Planck-Institute of Meteorology of the large orchestra).

This is done by simulating the past referred to as”hindcasts,”the researchers can create a virtual world does not affect global warming. This enables climate scientists to observe how climate change affects a place, such as the North Atlantic, by comparing our the real world is not affected by human-caused global warming.

The North Atlantic is undoubtedly a complex area, with deep, rich ice melt, large-scale ocean circulation and beyond. This is a place that needs more investigation. But today, an ongoing cold blob is certainly a big part of it.

“This is one of the characteristics of the changing oceans and changing climate,”said National Center for Atmospheric Research is Witt.



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