Fijnstof luidde volgens Belgian wetenschappers definitieve einde in van dinosauriërs: “Kettingreactie van uitstervingen kwam op gang” | Wetenschap & Planet

Fijnstof van pulverd gesteente the vrijkwam in the inslag of the Chicxulub-meteoriet heeft a dominante rol gespeeld in the uitsterven van leven op onze planet, zo’n 66 mijoen jaar geleden. The aim is to raise the temperature of the climate and improve photosynthesis, with all the benefits of this. This is the conclusion of a new forest, published in Nature Geosciencewaaraan ook Belgian onderzoekers hebben bijgedragen.

The inslag of the Chicxulub-meteoriet veroorzaakt a worldwijde inslagwinter, the 66 million years of life were hoogstwaarschijnlijk suffering dead of the ondergang of the niet-flying dinosaurs and zo’n 75 percent of the sorts on the air. The precision of the mass extinction on the scales of the geological periods of the Krijt and the Paleogeus were dead and never received.

This onderzoek suggests that the two waves and the details are the ones that are in the inslag and the red of the bosbrands after the inslag of the relevant parts of the winter. Maar what dat wel zo? The Vraag stelden Wetenschappers zich ook. What was the effect on the global climate of the various types of materials in the material from the crater on the atmosphere in which the silica material was used?

Lees verder onder de afbeelding

The inslag of the Chicxulub-meteoriet veroorzaakt a worldwijde inslagwinter which het a de betekende for a large root of the leven bij ons op aarde © Getty Images/Science Photo Libra

The role of the zwavel, roet en silicaatstof op het klimaat na de inslag te onderzoeken, ontwikkelden wetenschappers van de Koninklijke Sterrenwacht van België a new paleoklimaat model, specialized in the klimaat en de natuur na de Chicxulub-inslag te simulaten. In these simulations, the simulation will be carried out with new terrain, based on a geological location in North Dakota in the United States.

Sediment monsters are verzameld en meten door middel van laser-diffractie korrelgrootte-analyses door wetenschappers at the Vrije Universiteit Brussel (VUB) en de Vrije Universiteit Amsterdam (VUA). “We have a special design that is millimeter-thin from the Krijt-Paleogeen grenslaag genomen. In this case we say that it is from the air of the light that is not linked to the light of the meteorite. The new results of the latency here came from a wide range of correls, ranging from 0.8 to 8.0 micrometers in size. This is important for climate reconstruction. “Want in the verleden gaven wetenschappers other korrelgroottes in hun climate models,” says Pim Kaskes (VUB) uit.

Lees verder onder de afbeelding

Simulaties of climate models based on the rapid transport of substances across the planet, which means that the world is within a few days of the inslag of the Chicxulub meteorite, which is omringed through a cloud of fijnstof.
Simulaties of climate models based on the rapid transport of substances across the planet, which means that the world is within a few days of the inslag of the Chicxulub meteorite, which is omringed through a cloud of fijnstof. © Cem Berk Senel

Wetenschapper Cem Berk Senel van de Koninklijke Sterrenwacht van België puts the verder uit: “The new simulations with the fijnere korrelgrootte laten zien dat the silicaatstof dead maar ranst vijftien jaar on the inslag in the atmosfeer kan zijn gebleven. The temperature is at least 15 degrees Celsius in the inslag.” Volgens co-authors Steven Goderis and Philippe Claeys (both VUB) came to this location overeen with the inzichten opgedaan uit a recent design of a small piece middenin de Chicxulub inslagkrater in Mexico. This means that the necessary materials are used within a period of 20 years for the building, which is achieved with the new results of the climate model.

The design of the authors is intended for the production of the zonnestraling. This means that the photosynthesis will take place over two years as the product will be in style. This is a very long time that has an impact on the land. These plans do not have to adapt to the last time, but the poor period of time can be overloaded, and the mass has been removed. A chain reaction of uitstervingen kwam op gang. This came over with the help of fossielen, including co-author Johan Vellekoop (KU Leuven and Royal Belgian Institute for Nature). “Flora and fauna have a rust phase that is in contact with the area and is not attached to the surface of the forest, the weather forecast is over the whole area.”


Small and middelgrote asteroids come from above in the Zonnestelsel and can also be transported to the regional or national scale

“Inslagen the cave of Chicxulub the asteroïden the grootte of a kilometer the masses uitstervingen veroorzaken zijn zeldzaam, maar small and middelgrote asteroïden in the area of ​​100 meters come from the veel vaker voor in the Zonnestelsel and kunnen verwoestingen veroorzaken op regional tot national sch eel,” shows Özgür Karatekin van de Koninklijke Sterrenwacht van België. Daarom dragen de Sterrenwacht and de VUB bij aan de Hera-missie, an international experiment for planetary verdediging. The hera-missie zal de kinetische inslagtechniek voor de deflectie van asteroïden tes en daarbij wetenschappelijke informatie, waardoor we can’t get into the seed placement of asteroïden en inslagprocessen.

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