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Seasonal CO2 Levels Strongly Linked To Cyclic N. Hemisphere Sea Ice

by Dr. David Whitehouse
August 18, 2022, 7:47 AM
in News and Opinion
Reading Time: 3 mins read
A A
5

arctic sea iceCould we be wrong about the annual carbon dioxide cycle in the atmosphere?

That’s the suggestion by a pair of distinguished Oxford zoologists Clive Hambler and Peter Henderson who have just published a paper that could change our understanding of one of the critical observations of this greenhouse gas. [bold, links added]

They propose that sea-ice formation is the key factor and not biology.

The amount of carbon dioxide in the atmosphere has risen since records were kept regularly from about 1960.

Superimposed on the trend is a seasonal cycle which, when measured at the Mauna Loa Observatory in Hawaii is very regular, usually peaking in May.

Some scientists have called this cycle “the Earth breathing,” as they attribute it to biological activity on the large land masses of the Northern Hemisphere.

There is also a methane cycle though it is more complex and less regular, with peaks around November.

The Oxford researchers, however, point out that the “Earth-breathing” explanation for the annual carbon dioxide cycle is not as secure as many think.

The global carbon dioxide net emissions rate has a correlation of only 0.77 (significant at the 99.99% level) with lower tropospheric temperatures for the tropical land region.

Also, despite considerable effort to find the location, there is great uncertainty about where​​ the “Earth breathing” is taking place.

In addition, terrestrial biological productivity in the Northern Hemisphere is typically measured by a factor called NDVI (sometimes called “greenness”) but the researchers point out that this is less strongly correlated with carbon dioxide rates than sea-ice rates.

“To our knowledge, no region has been shown to have extremely high temporal synchrony and hence statistical correlation with the global carbon dioxide rate.”

To investigate further they looked for correlations between the annual carbon dioxide cycle and other physical parameters.

“We saw a particularly strong correlation with sea ice and that prompted us to look at other areas of the Arctic finding a range of very impressive matches.”

They hypothesize that b, it should also be highly correlated with the monthly rate of change of these greenhouse gases – whether or not sea ice is involved in the cycles.

They found that the seasonal cycles of carbon dioxide and methane are both very strongly correlated with the seasonal cycle of sea ice in the northern hemisphere leading them to ask, what, if any, is the role of sea ice and the high-latitude temperature variations that drives the dynamics of these gases?

“We hypothesize high-latitude air temperatures drive sea ice dynamics and snow dynamics and thence might influence greenhouse gas dynamics. Such strong relationships are not presented in the review of the carbon cycle that informs international climate policy and could focus greater attention on high latitude sites and fluxes.”

The global and Antarctic cycles of both gases have similarities suggesting the same processes or regions are involved in the dominant fluxes for both, despite their very different biological characteristics​.

Overall their results are consistent with stable isotopes of carbon in carbon dioxide being predominantly fractionated by the sea-ice formation and carbonate precipitation, rather than terrestrial photosynthesis.

“Fractionation by freezing and other abiotic processes involving carbonates may have been underestimated and should be examined in the field and with satellites giving coverage of polar, lakes, and desert regions,” they say.

Fundamentally the sea-ice hypothesis is supported by stronger correlations than the current explanation for the carbon cycle.

According to Clive ​Hambler, “I was one of the first people to teach climate change at Oxford and now I must be one of the first people who are saying that maybe this is wrong.”

Read more at NZW

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Comments 5

  1. Richard Greene says:
    3 years ago

    From the original article:
    “The global carbon dioxide net emission rate has a correlation of only 0.77 (significant at the 99.99% level) with lower tropospheric temperatures for the tropical land region. Also, despite considerable effort to find the location, there is great uncertainty about where​​ the “earth breathing” is taking place.”

    This is nonsense, not science
    CO2 emissions are an estimate, not a measurement
    Land only temperature data ignore 70% of the planet.
    The seasonal CO2 variantions have nothing to do with the long term increase of atmospheric CO2, estimated at +50% from 1850 through 2022
    The effect of that increase of atmospheric CO2 increase is unknow but a good guess is that it is responsible for some of the global warming since 1975. The correct answer, however, remains “We don’t know”

    Reply
  2. Dave of Gold Coast, Aust. says:
    3 years ago

    Extremely interesting concept, makes one wonder what other possibilities the ‘settled science’ mob have overlooked. Maybe instead of monstrous fear mongering and blatant lies, they should do some real work once in a while.

    Reply
  3. Randy Verret says:
    3 years ago

    Looking at empirical data without pre-conceived notions, testing new theories & formulating hypothesis’ that may NOT fall in line with the “scientific consensus” on the role of CO2 in climate change? Sounds (strangely) like a reasonable application of the scientific method. ACTUAL research. BLASPHEMY!!! I’m sure these scientists will soon be “de-frocked” as DENIERS & Haters as they DARE think for themselves….

    Reply

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