Sentences with phrase «deep ocean ventilation»

The millennial (500 — 2000 year) time scale of deep ocean ventilation aects the time scale for natural CO2 change, thus the time 20 scale for paleo global climate, ice sheet and sea level changes.

The millennial (500-2000 year) time scale of deep ocean ventilation affects the time scale for natural CO2 change and thus the time scale for paleo global climate, ice sheet, and sea level changes, but this paleo millennial time scale should not be misinterpreted as the time scale for ice sheet response to a rapid large human - made climate forcing.

Not exact matches

Climate changes that began ~ 17,700 years ago included a sudden poleward shift in westerly winds encircling Antarctica with corresponding changes in sea ice extent, ocean circulation, and ventilation of the deep ocean.

http://www.pnas.org/content/106/43/18045.full About a decade ago, Canfield (1) offered a very different possibility — that ventilation of the deep ocean lagged behind the GOE by more than a billion years, resulting in a vast, deep reservoir of hydrogen sulfide, but long - held presumptions about photosynthetic life in the surface waters remained untouched.

The Antarctic ice sheet reached the coastline for the first time at ca. 33.6 Ma and became a driver of Antarctic circulation, which in turn affected global climate, causing increased latitudinal thermal gradients and a «spinning up» of the oceans that resulted in: (1) increased thermohaline circulation and erosional pulses of Northern Component Water and Antarctic Bottom Water; (2) increased deep - basin ventilation, which caused a decrease in oceanic residence time, a decrease in deep - ocean acidity, and a deepening of the calcite compensation depth (CCD); and (3) increased diatom diversity due to intensified upwelling.

The Sea of Japan has an acidification rate 27 % higher at depth than at the surface, showing how reduced ventilation from warming could impact the deep ocean.

The sea is not only warming, leading to higher stratification and thus lower ventilation of the deep ocean, it also is becoming more acidic.

A growing number of paleoceanographic observations suggest that the ocean's deep ventilation is stronger in warm climates than in cold climates.

Among the suite of circulation models examined here, the largest reduction in atmospheric pCO2 of 44 — 88 ppm occurs in a model where reduced overturning rates of both southern and northern sourced deep waters result in a four-fold increase in the Southern Ocean deep water ventilation age.