ENV100Y5 Lecture : env100 note 43.docx

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lemonherring372

2 Mar 2012

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More light water locked up in ice caps, so ocean water starts out heavier: globally warm year: More light water released from ice caps, so ocean water starts out lighter. Models are another fundamentally important tool for climate study: general circulation models (gcms, 3-d mathematical models of climate system, link atmospheric, oceanographic, hydrospheric, and biospheric processes with geography and altitude, purposes: Run simulations of present-day climate patterns as a way of testing climate models. There are some sources of uncertainty in gcms: short time length of instrumental records, complexity and feedbacks in climate system, role of clouds. The ipcc summarizes evidence of climate change and predicts future impacts: trend = a pattern that persists within a data set, even after short-term fluctuations and anomalies have been accounted for. 4th assessment report (2007: consensus of scientific climate research from around the world, trends in surface temperature, precipitation patterns, snow and ice cover, sea levels, storm intensity, and other factors.

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Ecosystems overlap. Mainly because the "borders" of them are grey areas blending into the next type of habitat. One constant is the weather. Now, the weather is "local" and "climate" is global. (This is why it's called Global Climate Change.) The climate between ecosystems brings different weather patterns and thus change that can affect the organisms present.

We polluted our seed's water to model the effects of Acid Rain. Did you know that the acid rain that affects the Pacific Northwest, where you as an organism are now living, comes from air pollution produced in Asia?

Think. Using your new bioliteracy and Ecology knowledge...

1) Why is it important to think about biosphere change being "global" rather than ecologically "local"?

Rising CO₂ levels can impact our environment in a number of different and many times unanticipated ways. Last week we considered the effect of increased atmospheric CO₂ levels on leaf stomatal densities. This week we will explore the effect of increased CO₂ levels on ocean waters. Read the article posted on the Woods Hole Oceanographic Institutionâs website entitled Ocean Acidification and answer the questions that follow.

1. What is the relationship between global warming and ocean acidification?

2. What happens to ocean waters as the atmospheric concentration of CO₂ rises? Be specific in your response. Hint: For additional help, click on Carbon Dioxide in Seawater along the webpageâs sidebar.

3. What marine organisms do you anticipate will be most greatly impacted by ocean acidification? Why?

4. Scientists have found evidence of a massive release of CO₂ in the past (Palocene-Eocene boundary, 55 million ya) that is in some ways analogous to what is occurring today. Some marine species acclimated â some adapted â and some became extinct. Based upon the differences between that earlier event and what is occurring today, what would you anticipate would be the effect on marine fauna if CO₂levels continue to rise at current rates for the next fifty years?

Here is the link for the article: http://www.whoi.edu/main/topic/ocean-acidification

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human activities are causing global climate change and human initiatives are needed to control it.the study of global climate change therefore belongs to the field of....because climate change......
a) ecology;is related to the locations of biogeographic regions
b)ecology;affects both land masses and oceans
c) environmentalism; involves scientific,ethical and policy issues
e) environmentalism;affects humans more than any other species

ENV100Y5 Lecture : env100 note 43.docx

ENV100Y5 Full Course Notes

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