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- Thermohaline Circulation: Deep ocean currents driven by differences in water density. Density is controlled by water temperature and salt content (or salinity).
- Consequences of the halt of the thermohaline circulation being shut down include an increase in major floods and storms, a collapse of plankton populations, more severe El Nino events, and even oceanic anoxic events, which are when the stagnant deeper waters of the ocean run out of oxygen, which was a probable cause of past extinction events. Regional cooling would also occur.
- In a past thermohaline shutdown, Greenland cooled by about 44 degrees fahrenheight.  With the return of the thermohaline circulation, Greenland normalized.

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- With the melting of Artic sea ice, water is becoming less saline, and this disrupts the thermohaline circulation, which relies on the salinity and temperature of the seas.

- The EPA climate change indicators website states that, "since 1979, the length of the melt season for Artic ice has grown by 37 days. Artic ice starts melting 11 days earlier and refreezing 26 days later than it used to."

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Global Climate Changes Means Colder too!?

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Global Climate Changes Means Colder too!?

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Studies suggest the shutdown of the thermohaline circulation would mean much colder winters and hotter summers in Europe, changing rainfall patterns in the tropics, and warmer water building up along the U.S. coast that can fuel sea level rise and destructive storms. The changes in the North Atlantic could also intensify streams of icebergs into shipping lanes and coastal ice jams that hinder navigation. There are already signs that the weakening is having an effect. In 2015, scientists traced the imminent collapse of the commercially important cod fishery in the region to rapidly warming water in the Gulf of Maine, which fits the pattern of slowing Atlantic circulation. Record-warm water off the East Coast that helped fuel 2011's destructive Hurricane Irene, as well as Superstorm Sandy a year later, appears to fit that pattern, as well, according to NASA.

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Thermohaline circulation ( THC) is a part of the large-scale ocean circulation that is driven by global density gradients created by surface heat and freshwater fluxes.[1][2] The adjective thermohaline derives from thermo- referring to temperature and -haline referring to salt content, factors which together determine the density of sea water. Wind-driven surface currents (such as the Gulf Stream) travel polewards from the equatorial Atlantic Ocean, cooling en route, and eventually sinking at high latitudes (forming North Atlantic Deep Water). This dense water then flows into the ocean basins. While the bulk of it upwells in the Southern Ocean, the oldest waters (with a transit time of around 1000 years)[3] upwell in the North Pacific.[4] Extensive mixing therefore takes place between the ocean basins, reducing differences between them and making the Earth's oceans a global system. On their journey, the water masses transport both energy (in the form of heat) and matter (solids, dissolved substances and gases) around the globe. As such, the state of the circulation has a large impact on the climate of the Earth.
wikipedia.org

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Thermohaline circulation ( THC) is a part of the large-scale ocean circulation that is driven by global density gradients created by surface heat and freshwater fluxes.[1] [2] The adjective thermohaline derives from thermo- referring to temperature and -haline referring to salt content, factors which together determine the density of sea water.

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Impacts of Thermohaline Circulation Shutting down:

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Impacts of Thermohaline Circulation Shutting down:

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- This shutdown would carry a tremendous amount of heat northward, catastrophically affecting current climates.
- The warm water that goes to Europe from America would never get there, leading to Europe experiencing much colder temperatures.
- The warm water in America would stagnate in America, leading to warmer temperatures on the American East coast.