Ocean Acidification
Question:

When carbon dioxide (CO2) is absorbed by seawater, chemical reactions occur that reduce seawater pH, carbonate ion concentration, and saturation states of biologically important calcium carbonate minerals. These chemical reactions are termed "ocean acidification".

Ocean acidification is expected to impact ocean species to varying degrees. Photosynthetic algae and sea grasses may benefit from higher CO2 conditions in the ocean, as they require CO2 to live just like plants on land. On the other hand, studies have shown that a more acidic environment has a dramatic effect on some calcifying species, including oysters, clams, sea urchins, shallow water corals, deep sea corals, and calcareous plankton. When shelled organisms are at risk, the entire food web may also be at risk.

:Watch the attached video and then answer the question



How does the carbon dioxide (CO2) level in the atmosphere affects the coral's life in the ocean?


1 People tried to answer this question

As the levels of carbon dioxide (CO2) in the atmosphere increases, the pH decreases and the percentage of hydrogen ions increases thus it will be difficule for corals to extract the carbonate to form their shell and for this they will put in a lot of energy to form it than searching for food.

The carbon dioxide (CO2) levels don’t affect the pH levels and the percentage of hydrogen ions in the ocean and thus don’t affect the life of the corals in the sea.

As the levels of carbon dioxide (CO2) in the atmosphere increases, the pH decreases and the percentage of hydrogen ions increases thus it will be too easy for coral to form their shells and for this they will put in less energy in forming their shells than searching for food.

As the levels of carbon dioxide (CO2) in the atmosphere increases, the pH increases the same as the percentage of hydrogen ions increases thus it will be difficule for corals to extract the carbonate to form their shell and for this they will put in a lot of energy to form it than searching for food.




Comments:
1.  Bassat Niki (2021-05-20 16:00:00)
Sources of risk to the Gulf of Eilat

Feedback

Very interesting and enlightening article.

Considering the Gulf of Eilat, which is (as said in the article) the world's northernmost tropical sea ecosystem. Containing spectacular habitat for the rich biodiversity in the area.

A marked deterioration in water clarity and quality has been noted in recent years. Findings show that in 1996, about 70% of the corals in the Eilat area were alive and 30% dead; in 2001, the situation was reversed with only 30% live corals and 70% dead.

The main sources of harm doesn’t come from the exceeding level of CO2 but is a result of direct human activities - such as littering, oil leaks from marine vessels and from other sources, fishing, mariculture and industrial development.

Dealing with the subject of preserving sea life and coral reefs, we must look also into other aspects rather than just the carbon dioxide (Co2) level.

Being long time scuba diver, enjoying the magnificent views of corals and sea life, my preliminary concern is stopping the sea contamination caused directly by human activities.

Figure 1:  Sviva 2, oil combat vessel, during an oil spill drill, Dec. 2008. Photo: Ilan Malester

2.  Cohen Avishai (2022-05-20 16:00:00)
some remarks

I really liked your subject, the explanation is clear, and also the video.
I would have encluded, a picture of animals that at risk of lower PH, also I would want to sea a graph or some numbers of how this Low PH affects those animals as a proof of the danger.


3.  Goldhirsh Ofer (27.05.2016 pm 10.39.48)
The global pollution Chain Effect on our world

This topic emphasizes the chain effect between different pollution processes in different locations and their global effect. In this article we see that CO2 emission from sources on earth influences the sea ecosystem. It demonstrates that all processes on our blue plant are well connected in a way that is much more visible than the "butterfly effect".

The way this topic is presented, in this questionnaire and its introduction, requires some background in chemistry and biology. 

In order to extend the audience, I think that there is a place to try to explain it in a less scientific way:

Using video with basic animation as in the following video:


Credite to: New Understandings of Air-Sea CO2 Exchange in Polynya Systems: Results from the IPY ArcticNet and CFL Projects in the Cape Bathurst Polynya
By Brent Else

Step by step explanation like the attached presentation specially the pictures in slides 1 and 14 in the presentation at location: http://www.slideshare.net/mazz4/ecology-e-g-cycles-quadrats-simps-58904712

Credit to : Marthese Azzopardi Dr at University of Malta

(There are problems to attach the pictures when using explorer)

Finally, the issue presented is a good demonstration of the chain relations between pollution process from different types and locations. It shows their interaction and their global influence on our world. The issue is presented with accurate scientific explanations.

The information marks on the map extend the understanding of the topic and give good examples of the issues referred in the introduction and the questionnaire. They are related to the topic and to our location (Israel).

4.  malik hagai (29.05.2016 am 01.14.13)
Ocean Acidification feedback
First of all, I must compliment you on your chosen subject.
It seems that the subject was carefully chosen, and you learn about him a lot during the preparation of the question.
On this subject, Nature Reserves members are dealing with it today-worldwide. And the attention you gave it certainly will not disappear from the eyes of the people concerned.

Now about the question itself.
it was lack of  credits to the websites you take the article from, such as:
http://www.pmel.noaa.gov/co2/story/What+is+Ocean+Acidification%3F.

I would have recommendad to use as list description as needed,
leave the youtube scene, and a link if needed, and let the viewers search the answer for themself.
I would have puts it like this:

"according to the link and movie above, look for an articles reffering to the subject, read them and answer How does the carbon dioxide (CO2) level in the atmosphere affects the coral's life in the ocean? "
Thus, the question difficeltys level was rising from "understanding" to  "Study". And by the "Bloom's Taxonomy" This would be a higher level question.
 
The distractions Were excellent. Well written. And forcing the respondent to pay attention to small details. I wouldn't have touch them.

best regards,
hagai.

 

5.  ghadban hussein (05.06.2016 am 08.45.53)
Reply to malik hagai

Hagai, thank you for visiting and making remarks.

While writing the question, we read some articles, and we didn't rely on one particular article.

According to the course indicator, the question must be suitable for publication in international tests such as PISA, therefore we decided to write the question and this way.

6.  Tarabeh Rawan (05.06.2016 pm 12.24.04)
replay to Goldhirsh Ofer
thank you for visiting and writing us a review about the question.
the video you added gives the reader more background about the subject presented in the question.

7.  abo shkara mohand (06.06.2016 pm 07.05.01)
Reply to Cohen Avishai
Thank you for your remark and the added graph it made it clearer to others to understand the subject . we thought that adding numbers and graphs is needed , howerer, our aim was to keep the subject as simple as possible and not complicated .


History of edits
Edited BY: hussein ghadban Edit Date: 2016-05-15 15:09:57
Edited BY: hussein ghadban Edit Date: 2016-05-15 14:34:47
Edited BY: yosra daso Edit Date: 2016-05-15 11:16:39
Edited BY: hussein ghadban Edit Date: 2016-05-14 22:09:57
Edited BY: hussein ghadban Edit Date: 2016-05-14 21:59:50
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