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 Moderated by: bartmanaz
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Dust  Rate Topic 
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 Posted: Tue Jun 23rd, 2020 09:48 pm
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Bullshipper
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Mana: 
The dust cloud is getting close.
Any have any info how long it could contaminate our area?


https://www.yahoo.com/news/caribbean-chokes-monster-saharan-dust-191405403.html

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 Posted: Tue Jun 23rd, 2020 11:20 pm
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MARIGOT
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I don’t know how long it will be with us, supposing it reaches us on the west coast.


But I thought the following story from Mexico News Daily was interesting, because I had never before received a satisfactory answer when asking what causes red tide.



The dust cloud currently making its way across the Atlantic.Annual Sahara Desert dust cloud is en route to Mexico
It is expected to arrive on the Yucatán Peninsula next week

Published on Saturday, June 20, 2020

A massive dust cloud from northern Africa’s Sahara Desert is on its way to Mexico and is expected to reach the Yucatán Peninsula next week.
Large amounts of yellow-colored Sahara dust arrive annually in Mexico, carried by eastern trade winds across the Atlantic Ocean to the Americas. Satellite images show that the huge dust cloud, considerably larger than those seen in recent years, is currently making its way across the ocean.
More than 100 million tonnes of desert dust are picked up by storms in Africa and blown across the Atlantic every June.


Researchers have found that the dust – made up of particles of iron, silicon, mercury and phosphorus, among other chemical elements – has an impact on air pressure above the Atlantic Ocean and can help to suppress the intensity of hurricanes.
The dust also act as a natural fertilizer and has been found to play a key role in restoring minerals to depleted rainforest soils in South America’s Amazon basin.
However, research also shows that it may be harmful to coral reefs if it descends into the ocean before reaching land. One study found that the dust can trigger toxic algae blooms, also known as red tides, that have the capacity to kill large numbers of fish, shellfish, marine mammals and birds.
As it reaches the Yucatán Peninsula, the dust is likely to create spectacular, brightly-hued sunrises and sunsets. Meteorologists say its arrival could be accompanied by torrential rain.
The dust is not considered particularly harmful to human health but can cause irritation in the eyes and throat, trigger allergies and aggravate respiratory conditions such as asthma.



Yucatán Peninsula residents are advised to limit outdoor activities while it is present in the region’s air.

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 Posted: Wed Jun 24th, 2020 05:16 pm
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frankiej
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MARIGOT, here is an explanation of red tide.


Red tide - Wikipedia

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 Posted: Wed Jun 24th, 2020 05:41 pm
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MARIGOT
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thanks, Frankie.
That was a long article, but a couple of sentences kind of cancel most of what it said.  Here is a copy and paste from the paragraph on Factors that may contribute to a bloom...


It is a natural phenomenon, but the exact cause or combination of factors that result in a red tide outbreak are not necessarily known.[2] However, three key factors are thought to play an important role in a bloom - salinity, temperature, and wind. 


 While no particular cause of red tides has been found, many different factors can contribute to their presence. These factors can include water pollution, which originates from sources such as human sewage and agricultural runoff.[25]


That’s why I found the info in the Mexico News Daily article interesting.  They mention a study and here’s the copy and paste from that story...


However, research also shows that it may be harmful to coral reefs if it descends into the ocean before reaching land. One study found that the dust can trigger toxic algae blooms, also known as red tides, that have the capacity to kill large numbers of fish, shellfish, marine mammals and birds.


That’s what caught my attention and helped explain the red tides in June.

Last edited on Wed Jun 24th, 2020 05:43 pm by MARIGOT

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