Dinosaur-Killing Asteroid Triggered Global Winter 66 Million Years Ago

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Explosion that killed dinosaurs blanketed skies with ash and unleashed a global "impact winter."

The massive asteroid impact that ended the age of dinosaurs some 66 million years ago triggered a decades-long, deadly, global "impact winter," an analysis of ancient sediment confirmed on Monday. (Related: "What Killed Dinosaurs: New Ideas About the Wipeout.")

Sea temperatures dropped as much as 12.6 degrees Fahrenheit (7 degrees Celsius) after the Chicxulub crater blast blanketed the planet in ashy darkness, halting photosynthesis, concludes the team led Johan Vellekoop of Utrecht University in the Netherlands.

Massive hurricanes also struck during the impact winter, according to a report his team published in the Proceedings of the National Academy of Sciences.

Written By: Dan Vergano
continue to source article at news.nationalgeographic.com

13 COMMENTS

    • True. Also, the earth would still be probably teeming with a variety of life, rather than just one dominant exploitive species.
      In reply to #1 by Cantaz:

      And hadn’t that happened, none of us would be here talking about it today…

      To the Dinosaur-Killing Asteroid, Hip Hip…

    • In reply to #2 by Christiana Magdalene Moodley:

      ….and then a tiny nondescript, shrewlike critter crawled outta the woodworks and the world has never been the same since then…..

      It’s a nice image, but highly unlikely. Mammals had already started to speciate and diversify well before the Cretaceous-Palaeogene Extinction Event. All but three of the mammalian orders had arisen before the extinction event, and those leftover three were elephants, hyraxes, and manatees and dugongs. Moreover, some of those orders were already starting to split into their major groups when the mass extinction event began. Our own ancestors had only just before then split off from those of the tarsiers. It’s more likely a whole host of mammalian creatures crawled out of the woodwork, some of which were already showing their own unique adaptations (though obviously not to the extent that would be seen today).

      Source

      • Thanks. I stand corrected :) In reply to #3 by Zeuglodon:

        In reply to #2 by Christiana Magdalene Moodley:

        ….and then a tiny nondescript, shrewlike critter crawled outta the woodworks and the world has never been the same since then…..

        It’s a nice image, but highly unlikely. Mammals had already started to speciate and diversify well before the Cretace…

  1. think of what survived. that’s really mind blowing when you look at the extreme and sudden change to the climate.

    might help AGW deniers to gain some perspective away from the “killing the planet” mantra. theres a microscopic mite attached to a flea behind my ear. it has a better chance of putting me in a headlock than humans destroying the planet. that message is important to anyone who thinks “even if we are changing the climate, we must be so powerful we could fix it”

    think of it more as giving evolution a nudge into a new direction that will be utterly fascinating if it weren’t for the lack of any humans to be fascinated

  2. Never doubted this ever since they found the crater, to be honest…I’m not a qualified scientist, but talk about a smoking gun? That and the irridium layer, the rest was common sense, not saying there weren’t other causes that contributed, but a dirty great rock like that oughta do it, lol

  3. Long suspected is about right. It would be nice if these articles at least gave a hint about how they allegedly were able to prove this. Some of your readers are actually able to read and comprehend a lot of English text in order to get this information.

    • In reply to #6 by John Gohde:

      Long suspected is about right. It would be nice if these articles at least gave a hint about how they allegedly were able to prove this. Some of your readers are actually able to read and comprehend a lot of English text in order to get this information.

      It has been common knowledge in numerous scientific publications, that large quantities of fine dust and/or SO2 in the atmosphere, cause significant cooling, regardless of if the source is impact craters, volcanic explosions, or human industrial pollution.

  4. 12.6 F is not equal 7 C, and science magazines or books should not be using Fahrenheit degrees or any other English System measurement units, in my opinion; it is a waist of brain, we should have just one single measurement system language.

    • In reply to #11 by alcer123:

      12.6 F is not equal 7 C,

      It is approximately correct as a number of degrees, but not as a thermometer reading.

      and science magazines or books should not be using Fahrenheit degrees or any other English System measurement units, in my opinion; it is a waist of brain,

      England now uses the metric system and °C or K. It is USA which still uses °F and old English imperial units.

      we should have just one single measurement system language.

      We certainly should, as this NASA foul-up which crashed a Mars probe proved in 1999.

      MARS CLIMATE ORBITER TEAM FINDS LIKELY CAUSE OF LOSS – http://mars.jpl.nasa.gov/msp98/news/mco990930.html
      >

      The peer review preliminary findings indicate that one team used English units (e.g., inches, feet and pounds) while the other used metric units for a key spacecraft operation. This information was critical to the maneuvers required to place the spacecraft in the proper Mars orbit.

      “Our inability to recognize and correct this simple error has had major implications,” said Dr. Edward Stone, director of the Jet Propulsion Laboratory. “We have underway a thorough investigation to understand this issue.”

      Two separate review committees have already been formed to investigate the loss of Mars Climate Orbiter: an internal JPL peer group and a special review board of JPL and outside experts. An independent NASA failure review board will be formed shortly.

    • In reply to #11 by alcer123:

      12.6 F is not equal 7 C, and science magazines or books should not be using Fahrenheit degrees or any other English System measurement units, in my opinion; it is a waist of brain, we should have just one single measurement system language.

      Waste….

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