Spring bloom for South Africa
Spring bloom for South Africa
Cool phytoplankton Blooms tend to occur at intersections: between land and sea, between different ocean currents and between seasons. The three may have been working near South Africa in the first half of November 2018.
the Moderate resolution image spectroradiometer (MODIS) at NASA Water the satellite acquired this natural color image on November 14, 2018. It shows a flowering of phytoplankton off the south coast of South Africa. The flowering became for the first time. visible on November 9 and it was still going on in Nov. 16.
Phytoplankton is a tiny, floating cell, similar to a plant that converts sunlight into food. They are responsible for almost half of the Earth's primary production, that is, they convert carbon dioxide, sunlight and nutrients into organic matter. They are the center of the ocean's food web, the main food that feeds life in the sea. The amount and location of phytoplankton affect the abundance and diversity of everything from fish to shellfish and zooplankton to whales.
Like terrestrial plants, phytoplankton require sunlight, water and nutrients to grow. As the southern hemisphere progresses from spring to summer, sunlight is increasingly abundant. Spring and autumn also tend to be times of turbulent winds and changing weather in both hemispheres, so it is possible that the South African bloom was triggered by seasonal winds that stirred the nutrients of the coastal or coastal waters. emergence of the seabed.
The waters of southern Africa are also notoriously turbulent and well mixed, since two major ocean currents are found in the area. The hot water comes from the Indian Ocean in the rapid movement Agulhas Actual, which flows along the east coast of Africa. The colder, slower Benguela current It flows north along the southwest coast of Africa. Converging from South Africa, currents often generate eddies, rebellious waves and other agitated movements that mix the ocean's layers and bring nutrients to the surface.
Finally, there could be another stimulus for the current flourishing, although the idea is mainly speculation. In the last weeks,
Forest fires have burned along the Garden Route near the South African coast, and the smoke was dragged towards the sea on many occasions. The smoked winds can transport ash, dust, metals and other aerosols and pollutants over the ocean, where they fall on the surface of the sea.
Researchers know from other studies that dust in the air Y volcanic ash It can provide nutrients to cause the proliferation of phytoplankton, but it is not clear if the particles of fire in the air could do the same. In 2017, the researchers made an impromptu attempt to investigate the impact of the California wildfires in the Pacific Ocean.
In November 2018, near South Africa, there is still very little information to blame the fires, and the more conventional explanations are probably correct. "We can not say much about this case without additional information, such as in the place observations, "said Santiago gassed, a scientist at NASA's Goddard Space Flight Center who has studied the impacts of dust and ash on the ocean. "In this case, while the possibility of causality [fire] It is tempting to say that there are many other more likely reasons. "
Image of the NASA Earth Observatory by Lauren Dauphin, using MODIS data from NASA EOSDIS / LANCE and GIBS / Worldview. History of Michael Carlowicz.
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