Ocean acidification

This thread is for discussion of ocean acidification, its causes, properties and ramifications.

19 Thoughts on “Ocean acidification

  1. THREAD on October 19, 2010 at 2:31 pm said:

    The PH Scale

    0 – 14,

    7 is neutral,

    7 -14 is alkaline,

    0 – 7 is acid,

    the ocean is 8+

    Go figger!

  2. Acid Seas, Back to Basic

    Dennis Ambler, February 2010

  3. Richard C (NZ) on October 23, 2010 at 11:25 am said:

    Huff Post is really getting silly now.

    Climate Science Round-Up: Ocean Fertilization (or Climate Liposuction)

  4. THREAD on October 29, 2010 at 8:46 pm said:

    Ocean Acidification Database

    CO2 Science

  5. Richard C (NZ) on November 3, 2010 at 11:11 am said:

    NGO pleads for $15 billion “ocean acidification” monitoring system

    Posted on November 1, 2010 by Anthony Watts

    Via Eurekalert, from the NGO Partnership for Observation of the Global Oceans (POGO), a press release that says, “panic! please send money”. Here’s the punch line:

    The Foundation says the average level of pH at the ocean surface has dropped from 8.2 to 8.1 units, “rendering the oceans more acidic than they have been for 20 million years,”

    Note that any pH lower than 7.0 is considered “acidic”. Distilled (pure) water has a pH of 7.0. Right now the ocean with a pH of 8.1 is considered “basic”.

  6. Richard C (NZ) on November 12, 2010 at 2:33 pm said:

    Are oceans becoming more acidic and is this a threat to marine life?

    By Dr J Floor Anthoni (2007)


  7. Andy on July 9, 2011 at 8:03 pm said:

    The great men of Otago (Doug Mackie and Keith Hunter) are planning an 18 part series on Ocean Acidification over at Skeptical Science.


    As Mackie points out at Hot topic

    “Denialists have not touched ocean acidification because they don’t understand it.”

    No Doug, that’s right.
    Actually, we haven’t had time to deal with this particular issue, and I am so glad that the great NZers in Otago have managed to lay claim to this last bastion of CAGW

    Don’t worry guys, the Zulus are coming.

  8. Richard C (NZ) on October 4, 2011 at 9:09 am said:

    NIWA’s acidic ocean
    New Climate Change Atlas for our massive ocean real estate

    Monday, 3 October 2011, 9:22 am
    Press Release: NIWA

    The seas surrounding New Zealand could warm by up to 4oC in the coming century.

    The last ten years of monthly monitoring results have shown an increase in acidity in Subantarctic waters off Otago. This is probably due to the recorded increase in atmospheric CO2 and subsequent CO2 uptake by the ocean. This trend is consistent with that observed in long-term time series studies in other regions of the ocean. Ocean acidification has been shown to affect reproduction, behavior, and physiological functions of some species.

    Background facts

    • surface waters will warm, freshen (i.e., become less salty), and so become less dense. This will increase the density gradient between surface and deeper waters (i.e., stratification), which will reduce the upward supply of plant nutrients to the surface from deeper waters

    • the surface layer where the phytoplankton live will become thinner and so the phytoplankton will receive more light

    the warmer ocean will contain less dissolved oxygen, and the volume of the mid-water column oxygen-deficient zones will increase

    • increasing carbon dioxide in the atmosphere will enter the ocean making it more acidic and causing carbonate shells to dissolve at shallower depths

    • there will be large-scale changes in wind fields, affecting ocean currents and vertical mixing

    • storm frequency and dust deposition will increase, influencing nutrient supply.

    Massive spin by NIWA predicated on the words “could warm”.

    Apparently the ocean is already acidic and it WILL become MORE acidic according to NIWA.

    The ocean is basic (pH 8 -9) according to this scale:-


    Fish reproduction is affected by acidity pH 4 – 5 and fish die in acidity pH 3 – 4.according to college education material.

    So NIWA:-

    Is the ocean acidic or basic?

    Is it acidic and nearing pH 4?

    What was the actual pH “acidity” measurement of Subantarctic waters off Otago (and why didn’t you include that in your Press Release)?

  9. Richard C (NZ) on February 23, 2012 at 9:20 am said:

    A team led by Dr. Daniel Mayor, an Independent Research Fellow at the University of Aberdeen’s Oceanlab, investigated how future global warming and ocean acidification scenarios affected the health of copepod eggs.

    Unlike many other climate-change studies, they repeated their experiment at a later date and found different results.

    Dr. Mayor said: “Both of our experiments indicated that the health of copepod eggs remains unaffected when they are exposed to ocean acidification levels predicted for the end of the 21st century. This is great news.


  10. Jim Mck on November 26, 2012 at 2:46 pm said:

    I quess it is not surprising to see articles like this appearing ahead of Doha. I am sure Dorothee
    will have earned a ticket.


    “Rising acidity levels threaten ocean’s food chain, study finds”


    After 80% of the article details ridiculous claims about absorption of ACO2 causing dangerous rises in ocean acidity, we find that has nothing to do with the research.


    “We know that the seawater becomes more corrosive below a certain depth which occurs at around 1,000m. However, at one of our sampling sites, we discovered that this point was reached at 200m depth. Marine snails – pteropods – live in this top layer of the ocean,” Bednarek said.

    Climate models forecast more intense winds in the Southern Ocean this century if CO2 continues to increase, which will make the mixing of deep water with more [should that be less]acidic surface waters more frequent, the study said.

    This will make calcium carbonate reach the upper surface layers of the Southern Ocean by 2050 in winter and by 2100 all year round, said the study’s co-author Dorothee Bakker, research officer at the University of East Anglia.”

    Seemingly any piece of scientific research can be spun into a good headline.

  11. Richard C (NZ) on September 10, 2014 at 10:04 pm said:

    The best continuous long-term record of observed pH is the Monterey Bay Aquarium from 1996-present (from The Hockey Schtick):



    Multiple plots of the pH spot check data vs. time, for the period 1995 – present as
    measured in the incoming water to the Monterey Bay Aquarium drawn from a
    ~50ft depth. Each of the following pages contains a 10-year period of the data,
    with the monthly mean ± standard error of the spot checks being presented. The
    pH was analyzed using the method outlined with this project. Both short-term
    seasonal changes and longer-term events, such as El Nino, are present in the


    Theory, meet reality.

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>