New Study Indicates Iceland Must Have Been 3°C Warmer During The Early Holocene To Match The Glacier Record

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During the Early Holocene, when CO2 levels lingered near 260 ppm, ice core records suggest surface temperatures in Iceland were about 3°C warmer than today.

Iceland’s extensive lakes and glaciers topography provides a verifiable history of the region’s paleoclimates.

For example, scientists can infer summer temperatures 3°C warmer than today in Iceland to account for the millennia when glaciers had “disappeared” from the landscape (Geirsdóttir et al., 2019).

Image Source: Geirsdóttir et al., 2019

Further, sea ice extent around Iceland was nearly non-existent throughout the Early Holocene. The highest sea ice cover values are recorded after the Medieval Warm Period and during the Little Ice Age. Today’s (2000 C.E.) sea ice extent is only slightly lower than the highest values of the last 8000 years (Geirsdóttir et al., 2019).

Image Source: Geirsdóttir et al., 2019

A new study (Harning et al., 2020) using the history of the Drangajökull glacier also affirms the surface temperatures during the Early Holocene – when CO2 levels were about 150 ppm lower than they are today – were about 3°C warmer than the late 20th century. This would not appear to be consistent with claims that CO2 variations are a driver of temperatures or glacier melt.

Image Source: Harning et al., 2020
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8 responses to “New Study Indicates Iceland Must Have Been 3°C Warmer During The Early Holocene To Match The Glacier Record”

  1. Zoe Phin

    I find it difficult to believe that it could be warmer AND there is less co2 in the atmosphere.

    The only explanation I can think of is that our glacial co2 record is garbage. It is garbage because the DRY EXTRACTION method is fraudulent.

    Jaworowski wrote about this.

    Thoughts?

    1. Kurt in Switzerland

      Zoe,

      The only reason you find it “difficult to believe” [that lower levels of CO2 could possibly be associated with lower global temperatures] is that you have been subjected to a propaganda onslaught which Goebbels himself couldn’t have dreamed possible.

      Inform yourself about geological facts first. Then draw conclusions.

      It is not in the least bit controversial to acknowledge that early- to mid-Holocene climate was as warm or warmer than today for roughly 65% of the time. Glacier extent was smaller as a function of altitude and latitude than it is today. The tree line was higher.

      The estimate of atmospheric CO2 vs time over the past several hundred thousand years is not massively disputed (certainly not over the current interglacial (our own Holocene), which is roughly 10K y old (initiation somewhat earlier). The start of the massive warming gave rise to 120m sea level rise over the course of a few thousand years.

      CO2 has never controlled earth’s surface temperatures. To the contrary, the temperature rise (and fall) always precedes the corresponding reaction in CO2 levels in the ice core records, by hundreds of years.

      Inconvenient, yet true. I wish you well in your search for truth.

      1. Zoe Phin

        I meant temperature controls CO2. If it was hotter, there should have been more CO2.

        If we don’t detect more CO2, it’s probably because the DRY extraction technique vastly underestimates CO2. Jaworoski claimed the underestimate is 2 to 3 times.

  2. William Hoffman

    A valid explanation is that CO2 did not cause warming. It still doesn’t.

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