Sentences with phrase «upwelling zones»

Since phytoplankton form the base of marine food webs, the world's most productive fisheries are located in areas of coastal upwelling that bring cold nutrient rich waters to the surface (especially in the eastern boundary regions of the subtropical gyres); about half the world's total fish catch comes from upwelling zones.

The California Current System (CCS) contains one of the five major coastal upwelling zones in the world's oceans, and hosts a great diversity and abundance of marine life [1].

The deep upwelling zones are in the North Indian and North Pacific Oceans.

You don't understand that the ocean surface is ALWAYS warmer than the atmosphere even in upwelling zones.

Effectively, CO2 is absorbed into the ocean in polar regions and is outgassed via the tropics and other upwelling zones.

For example, the occurrence of kelp is frequently correlated with oceanographic upwelling zones, which provide unusually high concentrations of nutrients to the local environment.

Reductions in seafloor POC flux will be most drastic, on a percentage basis, in the oceanic gyres and equatorial upwelling zones, with the northern and southern Pacific Ocean and southern Indian Ocean gyres experiencing as much as a 32 — 40 % decline in POC flux (Tables 2, 3; Figures 2, 3).

Once thought to be a periodic phytoplankton bloom, the highly visible occurrence (shown here as wispy areas near the coast) is now known to be the result of periodic hydrogen sulfide gas eruptions from the diatomaceous sediments underlying the highly productive waters of the northern Benguela upwelling zone.

Known as the «sulfur pearl of Namibia,» this anaerobic species digests organic matter under low - oxygen (or no - oxygen) conditions that are caused by high rates of phytoplankton growth in the Benguela upwelling zone, and the subsequent decay of large masses of dead phytoplankton that have fallen to the seafloor.

The waters of the upwelling zone off of Peru and Chile are always up to 8DegC cooler than waters to the West, causing easterly winds.

Some of the flow continues around South Africa as narrow (50 km or 30 mi wide) filaments that cool rapidly and mix with the surrounding waters in the large upwelling zone off Africa's Namibia coast.

Mauna Loa Station (MLO) is a site characterized by a prevailing wind from the northeast, a well known upwelling zone of the North East Pacific.

The well - known decrease in pressure from 1976 to 1977 is analogous to transitions that occurred from 1946 to 1947 and from 1924 to 1925, and these earlier changes were also associated with SST fluctuations in the tropical Indian (Figure 3.29, lower) and Pacific Oceans although not in the upwelling zone of the equatorial eastern Pacific (Minobe, 1997; Deser et al., 2004).

Not exact matches

This happened in two steps: First, in the Antarctic zone of the Southern Ocean, a reduction in wind - driven upwelling and vertical mixing brought less deep carbon to the surface.

One of the largest and most extensive low - oxygen zones ever recorded off the West Coast prevailed off the Oregon Coast last summer, probably driven by low - oxygen water upwelled from the deep ocean, the report said.

The plate failed to split completely, but geologists think that the event left scars below the NMSZ: a buried rift zone, where the rocks are weak and fractured, over plutons — blobs of dense igneous rock — that themselves rose from an upwelling of unusually dense lower crust.

«The mantle transition zone beneath West Antarctica: Seismic evidence for hydration and thermal upwellings.»

Dygert said that while it's well known that magma upwelling from the mantle at mid-ocean spreading zones creates new crust, there are many questions on how the process works.

These vast mid-ocean deserts are normal, because there is not a significant amount of upwelling in these zones.

Upwelling in the northwest Indian Ocean provides sufficient surface productivity to provide an excess of organic matter to sediments on the continental slope of the Arabian Peninsula where the oxygen minimum zone intersects the slope.

In contrast, the Oregon zone appears to be linked to low O2 levels in upwelling subarctic bottom water; you are correct in that high effluvient outflow would also produce such effects, but that would look more like the Peruvian system.

For a rough estimate, downwelling water to the deep ocean in convection zones is about 40 Sv (10 ^ 6 m3 / s), assuming that comes in with say 2 deg C, and leaves (through upwelling, isopycnal and diapycnal diffusion), that is a heat flux of 320 TW, thus at least an order of magnitude larger than the geothermal fluxes.

So the implication is that while, over the oceans in a broader sense my thesis may still be correct as a generalization, whatever happens in the NINO zones is driven by something completely different e.g. massive upwelling, currents etc..

These include eastern boundary current upwelling systems such as those off the U.S. west coast along coastal California, Oregon and Washington, deep - sea and subsurface oxygen minimum zones, and coastal waters that are already experiencing excess nutrient levels (eutrophication) and low dissolved oxygen (hypoxia) due to human - driven nutrient pollution from land - based activities.

Let's see — a negative SAM --(http://curriculum.pmartineau.webfactional.com/monitoring-southern-hemisphere-stratospheric-vortex-fluctuations-and-tropospheric-coupling/)-- pushes cold water along the Peruvian Current to the Nino1 +2 zone dissipating the warm surface mixed layer and allowing cold subsurface upwelling.

There are major zones of upwelling in the north and south eastern Pacific resulting in some of the richest environments on Earth.

Home of zones of major upwelling?

However, the conditions predicted for the open ocean may not reflect the future conditions in the coastal zone, where many of these organisms live (Hendriks et al. 2010a, b; Hofmann et al. 2011; Kelly and Hofmann 2012), and results derived from changes in pH in coastal ecosystems often include processes other than OA, such as emissions from volcanic vents, eutrophication, upwelling and long - term changes in the geological cycle of CO2, which commonly involve simultaneous changes in other key factors affecting the performance of calcifiers, thereby confounding the response expected from OA by anthropogenic CO2 alone.

All the clouds seen above started out first as water vapor evaporated from the ocean tropical zone from upwelling water warmed by incoming sunlight, and was not generated or created from the area under high cosmic ray intensity in the north where the radiation is higher.