4 thoughts on “Sahara dust cloud may reduce severe storms in the U.S.

  1. Masque of the Red Death says:

    “Red Tide hits Florida on a regular basis, but rarely is one of the algae blooms as deadly as this year’s. Already declared the worst in a decade, it’s killed a dozen dolphins, scores of manatees, hundreds of sea turtles and untold thousands of fish. Why is this year’s bloom so bad? The Sahara Desert may be to blame.” http://www.tampabay.com/news/environment/Why-is-Red-Tide-so-bad-this-year-Could-dust-from-the-Sahara-be-to-blame-_170958572
    “The Florida Fish and Wildlife Conservation Commission is reporting an outbreak of Trichodesmium, sometimes called a brown tide, in waters offshore of Manatee County.
    It is a separate species but similar to the well-documented Karenia brevis, a photosynthetic organism responsible for the persistent red tide hitting Manatee and other nearby counties along 130 miles of coastline. Concerns are now being raised that if the two blooms merge, it could essentially deepen an ongoing red tide. Kathleen Rein, a chemist at Florida International University, said a Trichodesmium bloom amid the ongoing red tide crisis could be “very bad news.” While unable to address the size, location or movement as of Thursday, Rein said, “I can tell you that Trichodesmium is a cyanobacteria. It is photosynthetic, like Karenia. Its growth is believed to be simulated by iron in Saharan dust. It fixes nitrogen, then the fixed nitrogen can be used by Karenia brevis to help it grow. Let’s hope the two blooms don’t find each other.” https://www.miamiherald.com/news/local/environment/article217278635.html

  2. Sleeping Giant says:

    ‘Weather models have flipped the switch’: Hurricane season coming to life in the Atlantic (USA Today) https://www.usatoday.com/story/news/nation/2018/08/29/hurricane-season-coming-life-atlantic/1132669002/ One of the reasons for the predicted increase in activity is that wind shear, which tends to rip apart developing hurricanes, appears to be decreasing. “There are signs now that wind shear may drop over a significant part of the Atlantic basin over the next couple of weeks,” said AccuWeather meteorologist Bernie Rayno.
    “Scientists examine African dust link to hurricanes” (Reuters UK 2007) “Studies so far indicate that dust clouds from Africa, which can grow as big as the continental United States and reach all the way to the Caribbean and Central America, tend to cool the Atlantic by reflecting sunlight.
    Hurricanes are fueled by warm water, so cooler seas could mean fewer or less intense storms.
    The hot, dry masses of dust may also interfere with already-formed hurricanes. Researchers say such a cloud can increase wind shear and inject dry air into a cyclone if the two come into direct contact.” https://www.reuters.com/article/us-weather-hurricanes-dust-idUSN0920911120070809

  3. Butterfly effect says:

    “Recent warming weakens global dust storm activity” https://www.eurekalert.org/pub_releases/2021-05/scp-rww052621.php
    “…One striking feature in the reconstructions is the substantially intensified dust storm activities after ~1870 AD, roughly coinciding with the beginning of the Industrial Revolution (Fig. 3). The increased dust particle supply induced by significantly intensified human activities could be responsible for this abrupt increase in dust storm activities. Another interesting feature is that although the dust storms have been systematically activated during the recent warming one more century, an obviously decreasing trend can be seen within this interval (Fig. 3). Authors proposed that the weakening trend was most likely due to the decrease in mean wind speed in response of the recent global warming. “In contrast to the natural solar forced warming, the greenhouse gas-triggered warming may lead to a decrease in global zonal temperature gradient and then a general increase in atmospheric static stability, which is potentially conducive to decreasing global wind speed and dust storm frequency/intensity” said Prof. Xu.”

    “Dust storms in northern China during the last 500 years” https://link.springer.com/article/10.1007/s11430-020-9730-2

  4. Scientific method says:

    “For two weeks in June 2020, a massive dust plume from Saharan Africa crept westward across the Atlantic, blanketing the Caribbean and Gulf Coast states in the U.S. The dust storm was so strong, it earned the nickname “Godzilla.” https://www.eurekalert.org/pub_releases/2021-05/uok-rer052621.php
    “Now, researchers from the University of Kansas have published a new study in the Bulletin of the American Meteorological Society parsing the mechanism that transported the dust. Their results explain a phenomenon that could occur more frequently in the years ahead due to climate change, affecting human health and transportation systems. African dust darkened the skies of the Caribbean and American Gulf States thanks to a trio of atmospheric patterns, according to the study.” https://journals.ametsoc.org/view/journals/bams/aop/BAMS-D-21-0014.1/BAMS-D-21-0014.1.xml

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