Past and Current Climate Changes

Past and Current Climate Changes

Submit electronically via Canvas (.doc, .docx, or .pdf file format).

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Please answer all questions in complete sentences.

Use the provided figures on to explore ocean circulation by looking at the chloroflourocarbon (CFC) content of the water.

Note that the only source of CFCs into the atmosphere is humans. Release of CFCs into the atmosphere increased after the 1960s but started decreasing in the late 1990-2015. Answer the following, keeping in mind that these measurements were taken in 1998-1999.

Hint: think about how the water in the ocean circulates and when it does/does not interact with the atmosphere due to thermohaline circulation.

Notes for interpreting the figures:

· The figures show a transect from North to South, one in the Pacific and one in the Atlantic.

· White spots indicate no data

· The grey areas show where the bottom of the ocean is at that location (aka the bathymetry)

· The color shows the concentration of CFCs in the ocean (NOT the temperature!)

1. In what areas of the Atlantic and Pacific is the CFC concentration zero? Why is that?

2. Identify how and explain why the Atlantic and Pacific CFC concentrations are different.

3. If we took another cross-section in the Atlantic today, how would you expect it to look different from the 1998-1999 cross-section? Why? Hint: Think about what is happening with CFCs in the atmosphere since 1998-1999.

CFC Concentrations in the Ocean

RED – HIGH concentration

PURPLE – LOW concentration

ATLANTIC

SOUTH NORTH

PACIFIC:

SOUTH NORTH

	Distinguished (100%)	Proficient (85%)	Basic (70%)	Below Expectations (50%)	Non-Performance (0%)
Thesis Statement	Raises the strongest   objection to the thesis presented in the assignment. The objection is strongly grounded in research and logical reasoning.	Raises a plausible objection to the thesis presented in the assignment. The objection is mostly grounded in research and logical reasoning.	Raises an objection to the thesis presented in the assignment. The objection is somewhat grounded in research and logical reasoning.	Attempts to raise an objection to the thesis presented in the assignment. The objection is minimally grounded in research and logical reasoning.	The objection to the thesis is either nonexistent or lacks the components described in the assignment instructions.
Counter Argument	Provides a strong, thorough rebuttal to the objection. The rebuttal effectively demonstrates that the thesis can withstand the objection and applies the principles of charity and accuracy.	Provides a rebuttal to the objection. The rebuttal mostly demonstrates that the thesis can withstand the objection and mostly applies the principles of charity and accuracy.	Provides a  limited rebuttal to the objection. The rebuttal somewhat demonstrates that the thesis can withstand the objection and somewhat applies the principles of charity and accuracy.	Attempts to provide a rebuttal to the objection; however, the rebuttal minimally demonstrates that the thesis can withstand the objection and does not apply the principles of charity and accuracy.	The rebuttal is either nonexistent or lacks the components described in the assignment instructions.
Conclusion	– Provides clear and concise closing remarks that comprehensively summarize the essay. The remarks consider the broader controversy and/or further research that could offer additional insight into the moral solution of the business problem.	Provides closing remarks that summarize the essay. The remarks mostly consider the broader controversy and/or further research that could offer additional insight into the moral solution of the business problem. The closing remarks are somewhat unclear.	Provides closing remarks that minimally summarizes the essay. The remarks minimally consider the broader controversy and/or further research that could offer additional insight into the moral solution of the business problems. The closing remarks are unclear and/or vague.	Attempts to provide closing remarks that summarize the essay, however, the remarks do not consider the broader controversy and/or further research that could offer additional insight into the moral solution of the business problem. The closing remarks are unclear and vague.	The closing remarks are either nonexistent or lack the components described in the assignment instructions.
Written Communication: Context of and Purpose for Writing	Demonstrates methodical application of organization and presentation of content. The purpose of the writing is evident and easy to understand. Summaries, quotes, and/or paraphrases fit naturally into the sentences and paragraphs. Paper flows smoothly.	Demonstrates sufficient application of organization and presentation of content. The purpose of the writing is, for the most part, clear and easy to understand. There are some problems with the blending of summaries, paraphrases, and quotes. Paper flows somewhat smoothly.	Demonstrates a limited understanding of organization and presentation of content in written work. The purpose of the writing is somewhat evident but may not be integrated throughout the assignment. There are many problems with the blending of summaries, paraphrases, and quotes. Paper does not flow smoothly in all sections.	Organization and presentation of content are extremely limited. The purpose of the writing is unclear. There is little or no blending of summaries, paraphrases, and quotes. Paper does not flow smoothly when read.	The assignment is either nonexistent or lacks the components described in the instructions.
Written Communication: Control of Syntax and Mechanics	– Displays meticulous comprehension and organization of syntax and mechanics, such as spelling and grammar. Written work contains no errors and is very easy to understand.	Displays comprehension and organization of syntax and mechanics, such as spelling and grammar. Written work contains only a few minor errors and is mostly easy to understand	Displays basic comprehension of syntax and mechanics, such as spelling and grammar. Written work contains a few errors which may slightly distract the reader.	Fails to display basic comprehension of syntax or mechanics, such as spelling and grammar. Written work contains major errors which distract the reader.	The assignment is either nonexistent or lacks the components described in the instructions.
Written Communication: Required Formatting	Accurately uses required formatting consistently throughout the paper, title page, and reference page.	Exhibits required formatting throughout the paper. However, layout contains a few minor errors.	Exhibits limited knowledge of required formatting throughout the paper. However, layout does not meet all requirements.	Fails to exhibit basic knowledge of required formatting. There are frequent errors, making the layout difficult to distinguish as required style.	The assignment is either nonexistent or lacks the components described in the instructions.
Written Communication: Word Requirement	The length of the paper is equivalent to the required number of words.	The length of the paper is nearly equivalent to the required number of words.	The length of the paper is equivalent to at least three quarters of the required number of words.	The length of the paper is equivalent to at least one half of the required number of words.	The assignment is either nonexistent or lacks the components described in the instructions.
Written Communication: Resource Requirement	Uses more than the required number of scholarly sources, providing compelling evidence to support ideas. All sources on the reference page are used and cited correctly within the body of the assignment.	Uses the required number of scholarly sources to support ideas. All sources on the reference page are used and cited correctly within the body of the assignment.	Uses less than the required number of sources to support ideas. Some sources may not be scholarly. Most sources on the reference page are used within the body of the assignment. Citations may not be formatted correctly.	Uses an inadequate number of sources that provide little or no support for ideas. Sources used may not be scholarly. Most sources on the reference page are not used within the body of the assignment. Citations are not formatted correctly.	The assignment is either nonexistent or lacks the components described in the instructions.

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