Natural Disasters (Science)

Wednesday, November 15, 2017

Natural Disasters (Science)

Hurricanes are intense low pressure areas that form over warm ocean waters in the summer and early fall. Their source of energy is water vapor which is evaporated from the ocean surface.

Water vapor is the “fuel” for the hurricanes because it releases the “latent heat of condensation” when it condenses to form clouds and rain, warming the surrounding air. (This heat energy was absorbed by the water vapor when it was evaporated from the warm ocean surface, cooling the ocean in the process.)

Usually, the heat released in this way in tropical thunderstorms is carried away by wind shear, which blows the top off the thunderstorms. But when there is little wind shear, this heat can build up, causing low pressure to form. The low pressure causes wind to begin to spiral inward toward the center of the low.

These winds help to evaporate even more water vapor from the ocean, spiraling inward toward the center, feeding more showers and thunderstorms, and warming the upper atmosphere still more. The showers and thunderstorms where all of this energy is released are usually organized into bands (sometimes called “rainbands” or “feeder bands”), as well as into an “eyewall” encircling the center of the storm. The eyewall is where the strongest winds occur, which encircle the warmest air, in the eye of the hurricane. This warmth in the eye is produced by sinking air, which sinks in response to rising air in the thunderstorms. The winds diminish rapidly moving from the eyewall to the inside of the relatively cloud-free eye, where calm winds can exist.
Video Rating: / 5

Learn how giant airstreams high in the sky get trapped sometimes – leading to devastating weather extremes on the ground.
Copyright: Potsdam Institute for Climate Impact Research PIK and Climate Media Factory. This video was supported by the German Research Foundation (DFG) and the German Federal Ministry of Education and Research (BMBF).

PIK research on the subject:
– Evidence for wave resonance as a key mechanism for generating high-amplitude quasi-stationary waves in boreal Summer
http://link.springer.com/article/10.1007/s00382-016-3399-6
– Influence of Anthropogenic Climate Change on Planetary Wave Resonance and Extreme Weather Events
https://www.nature.com/articles/srep45242
https://www.pik-potsdam.de/news/press-releases/weather-extremes-humans-likely-influence-giant-airstreams
– Summertime Planetary Wave-Resonance in the Northern and Southern Hemisphere
http://journals.ametsoc.org/doi/abs/10.1175/JCLI-D-16-0703.1
– Record Balkan floods linked to jamming of giant airstreams: https://www.pik-potsdam.de/news/press-releases/record-balkan-floods-linked-to-jamming-of-giant-airstreams
– Trapped atmospheric waves triggered more weather extremes: https://www.pik-potsdam.de/news/press-releases/archive/2014/trapped-atmospheric-waves-triggered-more-weather-extremes
– Cold, hot or dry: Persistent weather extremes associated with decreased storm activity: https://www.pik-potsdam.de/news/press-releases/cold-hot-or-dry-persistent-weather-extremes-associated-with-decreased-storm-activity
– Summer storm weakening leads to more persistent heat extremes: https://www.pik-potsdam.de/news/press-releases/summer-storm-weakening-leads-to-more-persistent-heat-extremes
– Record-breaking heavy rainfall events increased under global warming: https://www.pik-potsdam.de/news/press-releases/record-breaking-heavy-rainfall-events-increased-under-global-warming
Video Rating: / 5

7 Comments

  1. Deo Rio says:

    i lived in indonesia and experience the tsunami in aceh

  2. Yasin Butt says:

    you forget pakistan. because basterd currpt political.

  3. agung gumilar says:

    Cheers for the Video! Forgive me for butting in, I am interested in your thoughts. Have you considered – Proutklarton Crisis Away Plan (erm, check it on google should be there)? It is an awesome one of a kind guide for surviving and preparing for a disaster minus the normal expense. Ive heard some unbelievable things about it and my friend got amazing success with it.

  4. nil akash says:

    Cheers for the Video! Excuse me for chiming in, I would love your initial thoughts. Have you tried – Mahorrla Increasing Money Method (google it)? It is a good one off product for survivng during a major crisis without the headache. Ive heard some extraordinary things about it and my m8 at very last got excellent success with it.

  5. One more says:

    Tsunamis can also be caused by landslides, volcanic eruptions, or meteor (rocks from outer space) impacts. Earthquakes are just the most common cause.

  6. William Hamel Russell says:

    It is sad to see how we lose everything we've built in seconds.

  7. McDwmont says:

    encantados de que subas de nuevo, Simon

Leave a Reply