advertisement

Weather Past Climate Change

40 %
60 %
advertisement
Information about Weather Past Climate Change

Published on August 5, 2007

Author: john.payne

Source: slideshare.net

Description

weather lore - past climatic change
advertisement

WEATHER LORE PAST CLIMATE CHANGE

Is the global climate changing? Well, it would be very odd if that was not the case. Ever since the earth’s atmosphere first formed global climatic change has been the norm rather than the exception.

Is the global climate changing? Well, it would be very odd if that was not the case. Ever since the earth’s atmosphere first formed global climatic change has been the norm rather than the exception.

The earth has experienced a number of colder and warmer periods throughout its history. The cold times are the glacials or ice ages, the warmer times are the interglacials .

We are in one of the interglacials now, but it may, in fact, be the case that the earth and its atmosphere are generally significantly colder than it is during this present period.

We are in one of the interglacials now, but it may, in fact, be the case that the earth and its atmosphere are generally significantly colder than it is during this present period.

It usual to blame we humans for changes in climate; but since we weren’t around for the vast majority of the climate changes it follows that there must be one or more natural causes for these fluctuations in global temperature.

It usual to blame we humans for changes in climate; but since we weren’t around for the vast majority of the climate changes it follows that there must be one or more natural causes for these fluctuations in global temperature.

Scientists have come up with several hypotheses. Could the energy output of the sun vary? If the intensity of solar radiation changed over time, so would the earth’s temperature. We tend to think of the sun as an unchanging feature, in fact its energy is often called the ‘ solar constant ’, but it has a known and well-recorded short term variation in energy production, the sunspot cycle.

Scientists have come up with several hypotheses. Could the energy output of the sun vary? If the intensity of solar radiation changed over time, so would the earth’s temperature. We tend to think of the sun as an unchanging feature, in fact its energy is often called the ‘ solar constant ’, but it has a known and well-recorded short term variation in energy production, the sunspot cycle.

Over an 11 year period the suns energy waxes and wanes. Who’s to say it doesn’t have a longer and more pronounced cycle over thousands if not millions of years?

Over an 11 year period the suns energy waxes and wanes. Who’s to say it doesn’t have a longer and more pronounced cycle over thousands if not millions of years?

Could the orbit of the earth around the sun change from time to time? If the earth moved further out from the sun our share if its solar radiation would decrease and our temperatures would fall.

Could the orbit of the earth around the sun change from time to time? If the earth moved further out from the sun our share if its solar radiation would decrease and our temperatures would fall.

Yet another theory relates to mega-volcanoes, long periods of extreme volcanic activity emitting massive amounts of dust and gases into the upper atmosphere blocking out the radiation from the sun. Just think how one small cloud across the sun can reduce its heat when you’re sunbathing!

Yet another theory relates to mega-volcanoes, long periods of extreme volcanic activity emitting massive amounts of dust and gases into the upper atmosphere blocking out the radiation from the sun. Just think how one small cloud across the sun can reduce its heat when you’re sunbathing!

Perhaps meteorite impacts may occasionally fill the upper atmosphere with dust to create an effect similar to that produced by volcanoes. Around 65 million years ago an impact near present day Mexico reduced incoming solar radiation and produced a knock-on effect that caused the world-wide extinction of species. This included the poor dinosaur!

Perhaps meteorite impacts may occasionally fill the upper atmosphere with dust to create an effect similar to that produced by volcanoes.

Around 65 million years ago an impact near present day Mexico reduced incoming solar radiation and produced a knock-on effect that caused the world-wide extinction of species.

This included the poor dinosaur!

It’s not these natural changes we really need to worry about now, however, but the fact that for the very first time in the history of the earth we, its occupants, are able to have a global impact on climate. Let’s hope we don’t cause changes so devastating that we go the same way as the dinosaur!

It’s not these natural changes we really need to worry about now, however, but the fact that for the very first time in the history of the earth we, its occupants, are able to have a global impact on climate. Let’s hope we don’t cause changes so devastating that we go the same way as the dinosaur!

Add a comment

Related pages

The Earth's Climate in the Past | A Student's Guide to ...

Today's Climate Change Is Different! Today's climate change is different from past climate change in several important ways: The Earth was formed about 4.5 ...
Read more

Climate Change | Weather Underground

Find information, blogs, articles, news, and multimedia related to global warming, climate change, and evironmental changes, how and why the climate is ...
Read more

Climate change - Wikipedia

Climate change is a change in the statistical distribution of weather patterns when that change lasts for an extended period of time (i.e., decades to ...
Read more

What does past climate change tell us about global warming?

Natural climate change in the past proves that climate is sensitive to an energy imbalance. If the planet accumulates heat, global temperatures will go up.
Read more

Past Climate | NOAA Climate.gov

These natural records can give us a glimpse of Earth’s past climate ... How Do We Study the Climate of the Past? ... is influenced by weather and climate.
Read more

Past and Present Climate | Southwest Climate Change Network

Past climate; Abrupt climate changes; Present climate; Past climate. Climate records from deep oceanic sediments and wind-blown deposits span the last ...
Read more

Climate and past weather information

Climate and past weather; Climate and past weather. News and reports. Northern rainfall onset outlook; ... Climate Change In Australia opens in new window.
Read more

Climate change makes past five-year period the warmest on ...

UN weather body says man-made global warming and El Niño oceanic phenomenon made 2011-2015 the warmest five-year period on record Climate change made 2011 ...
Read more

Climate Change | US EPA

How does climate change affect our health? See our new fact sheets about the health impacts of climate change at different stages of life, and for ...
Read more

The Science of Abrupt Climate Change | Weather Underground

Weather Underground provides ... If an abrupt climate change of similar ... and carbon, now-casting, model development, past-climate-change ...
Read more