SlideServe
Menu
Préférences
© SlideServe · v2026

14.3 – Climatic Changes

cahil avatar
10 diapositives · 363 Views · Jul 20, 2014

14.3 – Climatic Changes. Ice Age. Periods of extensive glacial coverage Lots of ice sheets Average global temperature decreased by about 5°C Most recent ice age ended about 10,000 years ago Right now we are experiencing a warm period Interglacial intervals.  Short-Term Climatic Changes.

14.3 – Climatic Changes - slide 1
01 / 1014.3 – Climatic Changes
1 / 17

Télécharger la présentation

14.3 – Climatic Changes
Une image / un lien ci-dessous est fourni (tel quel) pour télécharger la présentation

Politique de téléchargement : le contenu du site vous est fourni TEL QUEL pour votre information et votre usage personnel ; il ne peut être vendu, concédé sous licence ni partagé sur d’autres sites sans l’accord de son auteur.Le contenu vous est fourni TEL QUEL, pour votre information et votre usage personnel uniquement. Téléchargez la présentation en cliquant sur ce lien. Lors du téléchargement, si vous ne parvenez pas à télécharger une présentation, l’éditeur a peut-être supprimé le fichier de son serveur.Pendant le téléchargement, si vous ne parvenez pas à obtenir une présentation, le fichier a peut-être été supprimé par l’éditeur.

F I N

Plus de contenu associé

Transcription de la présentation
  1. 14.3 – Climatic Changes

  2. Ice Age • Periods of extensive glacial coverage • Lots of ice sheets • Average global temperature decreased by about 5°C • Most recent ice age ended about 10,000 years ago • Right now we are experiencing a warm period • Interglacial intervals

  3.  Short-Term Climatic Changes • Seasons = short-term periods of climatic change caused by regular variations in daylight, temperature and weather patterns • Result from changes in the amount of solar radiation received • When the North pole points towards the sun, the Northern Hemisphere experiences summer • When it points away, it is winter

  4. El Niño • Band of warm ocean temperatures that develops off the coast of South America • High-pressure system and weak trade winds allow warm water to move towards South America • Causes warmer and wetter conditions

  5. Natural causes for climatic changes • Solar Activity • E.W. Maunder discovered that changes in Earth’s climate coincided with cycles of low sunspot activity • Little Ice Ages • Europe experienced bitterly cold winters and below-normal temperatures all year long

  6. Natural causes for climatic changes • Earth’s orbit = Elliptical orbit • When Earth is closer to sun, temperatures are warmer than normal • When orbit is farther away from sun, temperatures are below normal

  7. Natural causes for climatic changes • Earth’s tilt = the angle of the tilt of Earth’s axis is 23.5° • Change in tilt affects differences in seasons • Scientists hypothesize that changes in the angle can cause ice sheets to form near the poles

  8. Earth’s wobble • Every 26,000 years or so, the Earth wobbles as it spins on its axis • Currently axis points towards the North Star • Determines seasons • In about 13,000 years, scientists believe the axis will point towards Vega and our seasons will flip-flop

  9. Volcanic activity • Particles released during volcanic eruptions trigger climate changes • Dust and ash clog the atmosphere and block solar radiation • High volcanic activity = cool climatic periods

  10. In-Class Assignment/Homework • 14.3 WKT