[Bolincentret-at-su.se] Reminder: Two Bolin Centre Seminar TOMORROW at 11h00-12h00 and 14h00-15h00

[Annika Burström]

Reminder
Tomorrow 13/9 we host two Bolin Centre seminars. Can´t join us? Watch them live here: https://connect.sunet.se/bolincentre.
Bolin Centre Guest Seminar | Leonard Barrie<https://bolin.su.se/images/pdf_18/Guestseminar_Len-Barrie_2018.pdf>

Speaker                   Leonard Barrie, Professor Emeritus Stockholm University and The Cyprus Institute Adjunct Prof. McGill University, Montreal

Title                         The Impact of Atmospheric Sand and Dust on Climate and Environment
When and where     TOMORROW 13/9 at 11h00-12h00 in Ahlmannsalen, Geoscience Building
Abstract
Sand and dust aerosols (suspended particulate matter) play a major role in the climate and Earth system. They are suspended in a wide spectrum of sizes into the atmosphere by winds from dry surface soil. This occurs mostly in major arid regions of northern Africa, the Middle East and Asia. However, they are also found on other continents such as Australia. In the source region or well down-wind after transport over thousands of kilometres, sand and dust aerosols can affect weather and climate through interaction with incoming solar radiation and outgoing infrared radiation as well as by altering clouds and precipitation formation. As relatively effective ice nuclei, sand and dust particles may regulate the freezing of atmospheric super-cooled water in clouds. Atmospheric sand and dust particles can carry limiting nutrients such as iron, nitrate and phosphate from continents over long distances to marine surface waters. Once deposited these nutrients can stimulate primary production in the ocean surface with consequences for the carbon cycle and marine life. Dust deposits leave records in glacial snow and ice as well as in freshwater and marine sediments. These records yield insight into occurrence in the atmosphere and atmospheric processes involved in the dust cycle. Sand and dust have many other impacts. It can greatly affect human health and longevity when deposited in the respiratory system. This causes asthma, production of infections and related stresses on the body. While suspended in the atmosphere, it poses a problem to ground and air transport. It can also affect the economy of a region through impacts on agriculture and industry. Current knowledge of the occurrence, prediction and impacts of sand and dust globally are reviewed in this seminar.

[Leonard Barrie, Professor Emeritus Stockholm University and The Cyprus Institute Adjunct Prof. McGill University, Montreal]



Bolin Centre Seminar Series | Research Area 8<https://bolin.su.se/images/pdf_18/RA8_2018_v2_webb.pdf>
Hosted by RA8 = Biodiversity and climate

Speaker                   Love Dalén, Docent at Department of Zoology Swedish Museum of Natural History

Title                         Palaeogenomic history and extinction dynamics of the woolly mammoth
When and where     TOMORROW 13/9 at 14h00-15h in Ahlmannsalen, Geoscience Building
Abstract
The woolly mammoth inhabited large parts of the Northern Hemisphere for hundreds of thousands of years before finally becoming extinct ca 4,000 years before present. Analyses of ancient mitochondrial DNA from a large number of mammoth
remains suggest that changes in climate had marked impact on the mammoth's distribution and population size, likely due to it's effect on the habitat availability and through sea level changes. At the onset of the Holocene, rising sea levels
resulted in that mammoths became isolated on Wrangel Island. Recent analyses on multiple mammoth genomes has now allowed us to trace the consequences of this isolation on the mammoth's genetic architecture.

[Mammoth tusk. Photo: Love Dalén]

Welcome!

Bolin Centre for Climate Research
Stockholm University
SE-106 91 Stockholm, Sweden
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