Climate Changes due to Natural Processes
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1 Climate Changes due to Natural Processes 2.6.2a Summarize natural processes that can and have affected global climate (particularly El Niño/La Niña, volcanic eruptions, sunspots, shifts in Earth's orbit, and carbon dioxide fluctuations).
2 Climatic Changes Climatic Changes During the average human lifetime, climates do not appear to change significantly. Climatic change is constantly ongoing and usually takes place over extremely long time periods.
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4 Climatic Changes Ice Ages Ice ages were periods where the average global temperatures decreased by an estimated 5 C and there was extensive glacial coverage. Ice ages alternate with warm periods called interglacial intervals. The most recent ice age ended only about 10,000 years ago.
5 Ice Ages Climatic Changes
6 Climatic Changes Change Can Be Natural Climatic changes occurred long before humans came on the scene. Studies of tree rings, ice-core samples, fossils, and radiocarbon samples provide evidence of past climatic changes. These changes in Earth s climate were caused by natural events such as variations in solar activity, changes in Earth s tilt and orbit, and volcanic eruptions.
7 Climatic Changes Short-Term Climatic Changes Seasons are short-term periods of climatic change caused by regular variations in daylight, temperature, and weather patterns. These variations are the result of changes in the amount of solar radiation an area receives. During summer in the northern hemisphere, the north pole is tilted toward the Sun, and this hemisphere experiences long hours of daylight and warm temperatures. Throughout the year, the seasons are reversed in the north and south hemispheres.
8 Climatic Changes Short-Term Climatic Changes When the north pole is pointed toward the sun, the northern hemisphere experiences summer and the southern hemisphere experiences winter. During spring and fall, neither pole points toward the sun.
9 Climatic Changes Short-Term Climatic Changes El Ninõ vs La Nina Sea surface temperatures play a major role in global weather and nowhere is that more evident then in El Nino and La Nina patterns. These type of patterns often lead to weather extremes, some of which can be seen in our own backyards. El Ninõ is a warm ocean current that occasionally develops off the western coast of South America that causes many shortterm climatic changes. During an El Ninõ, warm water from the western Pacific surges eastward toward the South American coast. Increased precipitation over the northwestern coast of South America pumps large amounts of heat and moisture into the upper atmosphere.
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11 Climatic Changes Short-Term Climatic Changes El Ninõ This hot, moist air in the upper atmosphere causes sharp temperature differences in the upper air that allows the jet stream to shift farther south. El Ninõ brings stormy weather to areas that are normally dry and drought conditions to areas that are normally wet. The strong upper winds produced by an El Ninõ help keep tropical disturbances from increasing to hurricane-strength storms in the Atlantic Ocean. Eventually, the South Pacific high-pressure system becomes reestablished and El Ninõ weakens.
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14 La Nina La Nina is described as cooler-than-normal sea surface temperatures in the central and eastern Pacific Ocean, near the equator off the west coast of South America.
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16 Climatic Changes Change Can Be Natural Solar Activity The existence of sunspot cycles lasting approximately 11 years had been recognized since the days of Galileo. Studies indicate that increased solar activity coincides with warmer-than-normal climates, while periods of low solar activity coincide with cold climatic conditions.
17 Climatic Changes Change Can Be Natural Solar Activity
18 Climatic Changes Change Can Be Natural Earth s Orbit Climatic changes may also be triggered by changes in Earth s axis and orbit. The shape of Earth s elliptical orbit appears to change, becoming more elliptical, then more circular, over the course of a 100,000-year cycle.
19 Climatic Changes Change Can Be Natural Earth s Orbit When the orbit elongates, Earth passes closer to the Sun, and temperatures become warmer than normal. When the orbit is more circular, Earth is farther from the Sun and temperatures dip below average.
20 Climatic Changes Change Can Be Natural Earth s Orbit The angle of Earth s tilt varies from a minimum of 22.1 to a maximum of 24.5 every 41,000 years. Scientists theorize that these changes in angle cause seasons to become more severe and may cause ice ages.
21 Climatic Changes Change Can Be Natural Volcanic Activity Climatic changes can also be triggered by the immense quantities of dust released into the atmosphere during major volcanic eruptions. Volcanic dust can remain suspended in the atmosphere for several years, blocking incoming solar radiation and thus lowering global temperatures. Some scientists theorize that periods of high volcanic activity cause cool climatic periods.
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23 Greenhouse Effect 2.6.2B EXPLAIN THE CONCEPT OF THE GREENHOUSE EFFECT INCLUDING A LIST OF SPECIFIC GREENHOUSE GASES AND WHY CO2 IS MOST OFTEN THE FOCUS OF PUBLIC DISCUSSION.
24 Global Warming All life on Earth depends on climate conditions like temperature and rainfall. Our planet is getting warmer the 2000s were the warmest decade ever recorded. The term used to describe this increase in the average temperature of the Earth is global warming.
25 Global Warming
26 Scientists are trying to determine if this is a natural cycle of climate change or if it is caused by human activity. The greenhouse effect is a natural warming of both Earth s lower atmosphere and Earth s surface from solar radiation being absorbed and emitted by the atmosphere. Global Warming
27 The most widely accepted hypothesis is that global warming is at least partially due to human activities that add carbon dioxide and other greenhouse gases to the atmosphere. Other greenhouse gasses include: water vapor (H 2 O) carbon dioxide (CO 2 ) methane (CH 4 ) nitrous oxide (N 2 O) ozone (O 3 ) What do you think?
28 Sources of Global Greenhouse Gas Emmisions
29 Global Warming According to this hypothesis, the burning of fossil fuels combined with cutting and burning of forests worldwide is adding carbon dioxide to the atmosphere faster than it can be removed in the carbon cycle. This causes heat from the sun to be trapped in the air instead of being bounced back into space, which makes the planet warmer.
30 Why do we focus on CO2? We emit more CO2 than any other greenhouse gas. While other gasses may trap more heat, like methane, or they are harder to control ( natural sources )
What is Climate? Understanding and predicting climatic changes are the basic goals of climatology.
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