Hi Rachel. I have been enjoying your videos. Have you considered doing one on the various forms of renewable energy, from a geological perspective? Keep up the good work!
No. As regards ocean acidification, it is estimated that the ocean’s global mean surface pH may have declined (i.e., become less alkaline and thus more “acidic”) by -0.07 to -0.08 in the last 200 years - from pH8.12 during pre-industrial times to 8.04 to 8.05 today (Wei et al, 2015). N.B. The decline in pH occurred before 1930. However, and very importantly when you look the data after CO2 emissions began rising precipitously in the 1930s, the oceans have become less “acidic”!!! By way of comparison, from one season to the next, or over the course of less than 6 months, pH levels naturally change by ±0.15 pH units, or twice the overall rate of the last 200 years. On a per-decade scale, the changes are even more pronounced. Oceanic pH values naturally fluctuate up and down by up to 0.6 U within a span of a decade, with an overall range between 7.66 and 8.40. This is decadal rate of pH change is larger than the overall 200-year span (0.07-0.08) by a factor of 8.
t takes about 40 years for the burning of carbon fuels to soak the oceans and the result of our actions over the last 150 years is that we have a huge carbon battery in the oceans. We are at 400 ppm atmospheric co2 for the next 1000 years. Plant more plants on land and reestablish eelgrass in our coastal waters.
ammonites and all the other gigantic sea dwelling shell building organisms seemed to be doing just fine with a few extra thousands of ppm of co2, and may even have required sky high co2 level to come up with the plan to use co2 as a building block for their shells in the first instance.
Thanks for sharing 😊
I.....Just....Thank you....
- A tired student in his finals
Haha, I know that feeling. Best of luck! ;)
Hi Rachel. I have been enjoying your videos. Have you considered doing one on the various forms of renewable energy, from a geological perspective? Keep up the good work!
thank you so much!
Thanx ..
can i ask how does ocean acidification is related to negative carbon isotope excursion during the PETM?
No. As regards ocean acidification, it is estimated that the ocean’s global mean surface pH may have declined (i.e., become less alkaline and thus more “acidic”) by -0.07 to -0.08 in the last 200 years - from pH8.12 during pre-industrial times to 8.04 to 8.05 today (Wei et al, 2015). N.B. The decline in pH occurred before 1930.
However, and very importantly when you look the data after CO2 emissions began rising precipitously in the 1930s, the oceans have become less “acidic”!!!
By way of comparison, from one season to the next, or over the course of less than 6 months, pH levels naturally change by ±0.15 pH units, or twice the overall rate of the last 200 years. On a per-decade scale, the changes are even more pronounced. Oceanic pH values naturally fluctuate up and down by up to 0.6 U within a span of a decade, with an overall range between 7.66 and 8.40. This is decadal rate of pH change is larger than the overall 200-year span (0.07-0.08) by a factor of 8.
I like the nasa shirt👍
t takes about 40 years for the burning of carbon fuels to soak the oceans and the result of our actions over the last 150 years is that we have a huge carbon battery in the oceans. We are at 400 ppm atmospheric co2 for the next 1000 years. Plant more plants on land and reestablish eelgrass in our coastal waters.
ammonites and all the other gigantic sea dwelling shell building organisms seemed
to be doing just fine with a few extra thousands of ppm of co2,
and may even have required sky high co2 level to come up with the
plan to use co2 as a building block for their shells in the first instance.