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By Kenneth Richard on 5. September 2024
“…sea surface temperature has been the primary determinant of baseline atmospheric P(CO2) across the entire Cenozoic” – Frank, 2024 A new study analyzes paleo atmospheric CO2 levels using the modern-day observation that oceans release more CO2 as they warm and less CO2 as they cool – a reference to Henry’s Law. “…ambient CO2 is released […]
Posted in CO2 and GHG, Oceans, Paleo-climatology |
By Kenneth Richard on 26. August 2024
The modern rate of sea level rise is not even close veering outside the range of natural variability. A new study reminds us that, 8200 years ago, near-global sea levels rose 6.5 meters in a span of just 140 years. This is 470 centimeters per century, 4.7 centimeters per year, during a period when CO2 […]
Posted in Paleo-climatology, Sea Levels |
By Kenneth Richard on 19. August 2024
A new study dispels the claim that coral reefs are at risk from modern environmental changes or rates. From about 8000 to 6000 years ago the Great Barrier Reef (GBR) relative sea levels were ~2 meters higher and seas were rising at rates of ~6 to 7 meters per millennium (6-7 mm/yr). The Early Holocene […]
Posted in Coral Reefs, Paleo-climatology |
By Kenneth Richard on 15. August 2024
Yet another region has not been affected by CO2-induced “global” warming. A new biomarker temperature reconstruction (Szabó et al., 2024) spanning the last 2000 years reveals South Carpathian mean July temperatures varied from 13.4°C to 16.9°C throughout the Common Era, with an identifiable Little Ice Age and Medieval Warm Period. The mean summer temperature during […]
Posted in Cooling/Temperature, Paleo-climatology |
By Kenneth Richard on 8. August 2024
“Today there is no evidence that B. Gaini lives in permanently frozen lakes.” – Roman et al., 2024 Image Source: Public Domain Image According to a new study (Roman et al., 2024), fairy shrimp Branchinecta gaini occupied the Antarctic Peninsula’s seasonally ice-free Monolithic Lake throughout much of the last 2000 years. There were “longer ice-free […]
Posted in Antarctic, Paleo-climatology |
By Kenneth Richard on 29. July 2024
A new study reports Estonia’s climate was 2-3°C warmer and sea levels were 10-20 m higher ~7,300 years ago. Comparing detailed maps from 1915 and 1904 to 2004 and 2021 aerial images reveals the sea waters have receded from the coasts of Estonia so acutely that lagoons are fast disappearing, islands are being transformed into […]
Posted in Paleo-climatology, Sea Levels |
By Kenneth Richard on 22. July 2024
There were millennia during the past glacial (when CO2 levels were under 200 ppm) that were as warm or warmer than today. Four central Europe reconstructions, using collected evidence from disparate biomarkers, indicate there were periods (for example, 54,000 to 51,000 years ago, the Bølling–Allerød interstadial, 14,700 years ago) during the last glacial when temperatures […]
Posted in Paleo-climatology |
By Kenneth Richard on 15. July 2024
Popular claims that CO2 changes drive temperature changes currently or throughout the distant past “are based on imagination and climate models full of assumptions.” A comprehensive new study details a stochastic assessment determination of the sequencing of CO2 variations versus temperature variations since the 1950s, over the last 2,000 years (the Common Era), and throughout […]
Posted in Climate Sensitivity, Paleo-climatology |
By Kenneth Richard on 5. July 2024
Scientists continue to uncover evidence of a much warmer Early Holocene, when CO2 hovered near 260 ppm. According to a new study, an ancient 42-centimeter long oyster shell has been found ~20 km inland from today’s Taipei Basin (Taiwan) coast. Extensive isotope analyses (69 of them) of a 5 cm section of the shell reveal […]
Posted in Oceans, Paleo-climatology |
By Kenneth Richard on 20. June 2024
Greenland has not warmed (net) in the last 90 years. From 80,000 to 20,000 years ago Greenland warmed by 10-15 Kelvin within a span of “a few decades” 24 times (Kypke and Ditlevsen 2024). These abrupt warming periods occurred without concomitant CO2 concentration changes. And, of course, without human interference. Image Source: Kypke and Ditlevsen […]
Posted in Cooling/Temperature, Natural Variability, Paleo-climatology |
By Kenneth Richard on 17. June 2024
In a new study, scientists use the new “ostracod-clumped isotope thermometer” to reconstruct a much warmer Late Pleistocene/Early Holocene Mediterranean climate. Today’s average summer and winter temperatures are 22°C (21.4°C) and 8°C, respectively, at Central Italy’s Lake Trasimeno. Around 11,000-12,000 years ago, when CO2 hovered in the 220-230 ppm range, summer temperatures averaged 25°C, sometimes […]
Posted in Paleo-climatology |
By Kenneth Richard on 6. June 2024
A new West Greenland temperature reconstruction (Strunk et al., 2024) finds the region was 1.5 to 2°C warmer than today from 560 to 1100 CE, encompassing the Medieval Warm Period (MWP). The LOI (vegetation abundance) record reflects a much wetter, greener landscape during the MWP. Image Source: Strunk et al., 2024
Posted in Cooling/Temperature, Paleo-climatology |
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