A Tropical Plant’s Warmth Threshold Affirms Mid-Holocene Temps Were ‘7.7°C Higher Than Today’

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A warmth-demanding plant can provide us with solid evidence of a much warmer than today Mid-Holocene climate.

Growth of the tropical aquatic plant 𝐶𝑒𝑟𝑎𝑡𝑜𝑝𝑡𝑒𝑟𝑖𝑠 ceases when air temperatures fall below 10°C.

A new study says that from about 8000 to 5000 years ago it was warm enough in winter that 𝐶𝑒𝑟𝑎𝑡𝑜𝑝𝑡𝑒𝑟𝑖𝑠 could grow at the 40°N latitude in northern China. Today its warmth threshold growth limit is ~34°N.

Scientists can therefore deduce the Mid-Holocene winter temperatures needed to have been “7.7°C higher than today” at that time.

Image Source: Zhang et al., 2022

Another warmth threshold species study allows us to determine Arctic Svalbard needed to have been 6°C warmer than today during the Early Holocene, as molluscs that today can only survive 1000 km south of where they did 9000 years ago affirm the climate was much warmer in the past.

Image Source: Mangerud and Svendson, 2018
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21 responses to “A Tropical Plant’s Warmth Threshold Affirms Mid-Holocene Temps Were ‘7.7°C Higher Than Today’”

  1. A Tropical Plant’s Warmth Threshold Affirms Mid-Holocene Temps Were ‘7.7°C Higher Than Today’ - Climate- Science.press

    […] A Tropical Plant’s Warmth Threshold Affirms Mid-Holocene Temps Were ‘7.7°C Higher Than … […]

  2. Yonason

    Pardon the nitpick, Kenneth…

    “Warmth-demanding plant species can provide us with solid evidence of a much warmer than today Mid-Holocene climate.”

    Ceratopteris is a genus, not a species.
    https://www.liquisearch.com/ceratopteris

    “Ceratopteris is the only genus among homosporous ferns that is exclusively aquatic. It is pan-tropical and classified in the Ceratopteridoideae subfamily of the Pteridaceae.”

    Of course, “species” is technically correct in the context of this research, since all 4 (some say 6) species are pan-tropical; so if Ceratopteris spores are found, it won’t matter which species they are from since they all tell the same story – were they are found was very warm when they grew there; i.e., all species of Ceratopteris yield the same result, and species/genus can probably be used interchangeably.

    Like I wrote, it’s a nit-pick, which bothered me until I read through it, looked it up and thought about it.

    Gotta admire the tenacity of researchers who look for and identify tiny mud born Ceratopteris fern spores and then count them. Makes me cross-eyed just thinking about it. 😬

  3. J N

    This is why I found myself being here more often. You are making an excellent job in debunking lots of CAGW huge scientific mishaps with peer reviewed science.
    Some other sites tend to mix things with “right” and “far right” stuff that has nothing to do with science.
    Lots of these conclusions should have make in into the IPCC AReports. Science is made from plural research and not from “religion like” assessments.
    Cheers

  4. John Hultquist

    John Kerry is looking for you.

  5. Do Polar Bears Need Summer Sea Ice? – Newsfeed Hasslefree Allsort

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  6. Richard Greene

    Climate reconstructions are very rough estimates of local climates in the era of 100% natural climate changes. They are irrelevant for the subject of manmade climate changes from greenhouse gases.

    In addition. +7.7 degrees C. warmer is very hard to believe.
    If one is interested in the global average temperature, it was most likely a few degrees C. warmer than today, during the Holocene Climate Optimum — nowhere close to +7.7degrees C.

    1. peter jones

      What you believe is NOT relevant, only the data matters, you seem to reject this information on the basis that its warmer than you want it to have been, however if the data indicated that it was 7.7 Deg C COLDER than now would YOU have rejected it
      i doubt it.

  7. Yonason

    Finally…

    ” +77 degrees C. ….. is not relevant for the issue of manmade co2 emissions.

    If natural warming measurably surpasses any presumed warming due to manmade CO2 emissions, it is the man made CO2 that is irrelevant.

    ” If the consensus science of a few degrees warmer for the Holocene Climate Optimum is correct, then +7.7 degrees C. in the winter would mean the climate was NOT warmer in the three other seasons.”

    In the abstract we read that the +7.7°C was the authors’ estimate of MJaT (mean January temp), and for MAT (mean annual temp) they got +3.5°C (which is close to what you say “consensus science” holds), so I’m not sure what you are getting so upset with them about.

    Once again you appear to be arguing about claims that weren’t made.

    Also, see table 3 for temperature estimates from this and other papers.

    1. Yonason

      The above was to …

      Richard Greene 28. July 2022 at 1:20 AM

  8. Recent Warming is Not Unusual as Temperature Spikes Within Decades Have Occurred Regularly Over the Last 150 Million Years, Study Shows – The Daily Sceptic

    […] science continues to produce evidence of major temperature changes in the past. Two recent studies suggesting much higher temperatures are noted in the No Tricks Zone climate science site. A new […]

  9. Mark Frank

    I notice that paper estimates the mean annual temperature to be 3.5C higher. It is only the mean January temperature that is estimated to be 7.7C higher. But surely the key point is that this is just one location – part of China. Local variations over thousands of years can be very high. A global average change of 7.7C would be enormous. The last ice age was only about 5C colder than present.

  10. Estudio: Los picos de temperaturas en décadas han ocurrido regularmente durante los últimos 150 millones de año | Trikooba

    […] en el pasado. El sitio de ciencias climáticas No Tricks Zone señala dos estudios recientes que sugieren temperaturas mucho más altas . Se dice que un nuevo estudio demostró que hace […]

  11. Estudio: Los picos de temperaturas en décadas han ocurrido regularmente durante los últimos 150 millones de años

    […] de temperatura en el pasado. El sitio de ciencias climáticas No Tricks Zone señala dos estudios recientes que sugieren temperaturas mucho más altas . Se dice que un nuevo estudio demostró que hace 8.000 a […]

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