Video length: 3:58 min.
This NOAA video discusses how the ocean absorbs the increased amount of carbon dioxide released into the atmosphere, thereby changing the pH and buffering action of the ocean. These changes in pH are impacting calcifying organisms, such as corals and shellfish, and related food chains and ecosystems.
Goals adapted from CLEAN Reviewer comments:
- Introduce students to the causes of ocean acidification, ocean carbonate chemistry, sampling techniques, and impact of ocean acidification on marine food webs
- Used to supplement a chemistry, oceanography, marine biology, biology, ecosystem, environmental science unit on acids and bases/pH
ACTIVITY DESCRIPTION AND TEACHING MATERIALS
TEACHING NOTES / CONTEXT FOR USE
Teaching Notes / Context For Use by CLEAN Reviewers:
- As with all YouTube videos, teachers may want to limit access to the comments section. View in full-screen mode to limit distractions of YouTube ads and comments.
- Can be used in a chemistry, oceanography, marine biology, biology, ecosystem, environmental science unit on acids and bases/pH.
About the Science
- The NOAA video discusses the causes of ocean acidification, ocean carbonate chemistry, sampling techniques, and impact of ocean acidification on marine food webs.
- Passed initial science review - expert science review pending.
About the Pedagogy
- The educator will need to provide context in which to embed this video. A basic pre-knowledge of acids, bases, and chemical formulas would be helpful for better understanding this video.
- Teachers need to make clear that even though the process is called "ocean acidification" it does not mean that the ocean will become acid, but that the ocean, now slightly alkaline, has diminished carbonate buffering potential.
Technical Details/Ease of Use
- This is a YOUTUBE video accessed from NOAA's YouTube visualization website.
- Closed captioned text provided.
Assessment is at the discretion of the instructor.
REFERENCES AND RESOURCES
Related URLs These related sites were noted by our reviewers but have not been reviewed by CLEAN
http://www.nnvl.noaa.gov/MediaDetail.php?MediaID=722&MediaTypeID=2 This is the original source.
*Note that the original source link may be broken. The Youtube link is: http://www.youtube.com/watch?v=MgdlAt4CR-4
Description by NOAA:
Fundamental changes in seawater chemistry are occurring throughout the world's oceans. Since the beginning of the industrial revolution, the release of carbon dioxide (CO2) from humankind's industrial and agricultural activities has increased the amount of CO2 in the atmosphere. The ocean absorbs almost a third of the CO2 we release into the atmosphere every year, so as atmospheric CO2 levels increase, so do the levels in the ocean. Initially, many scientists focused on the benefits of the ocean removing this greenhouse gas from the atmosphere. However, decades of ocean observations now show that there is also a downside — the CO2 absorbed by the ocean is changing the chemistry of the seawater, a process called ocean acidification. This change in the ocean's chemistry will have profound effects on life in the ocean, and those who depend on it.