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By Kenneth Richard on 31. May 2021
Share this…FacebookTwitterA French physicist recounts the evidence affirming temperature changes are the cause of changes in atmospheric CO2 concentrations throughout the last 423 thousand years of the ice core record, thus invalidating the claims of more than a negligible role for CO2 in affecting climate changes. In a new study Dr. Pascal Richet re-emphasizes the […]
Posted in Antarctic, Climate Sensitivity, CO2 and GHG, Paleo-climatology |
By P Gosselin on 26. May 2021
Share this…FacebookTwitterWarmth led to the rise of the Roman Empire, while cooling accompanied its demise A new paper appearing in Scientific Reports titled “Persistent warm Mediterranean surface waters during the Roman period” by Margaritelli et al looks at the climate at the time of the rise and fall of the Roman Empire, and beyond. Hat-tip: […]
Posted in Paleo-climatology |
By Kenneth Richard on 17. May 2021
Share this…FacebookTwitterSea surface temperatures in the subpolar North Atlantic increased by nearly 1°C from 2015 to 2018 according to a new study (Desbruyères et al., 2021). As of 2020, this region is now almost as hot as it was in 2007, 1930, and 1890 (Birkel et al., 2018). Image Source: Desbruyères et al., 2021 Image […]
Posted in Cooling/Temperature, Oceans, Paleo-climatology |
By Kenneth Richard on 13. May 2021
Share this…FacebookTwitterFossilized evidence of temperate rainforests only hundreds of kilometers from Antarctica’s South Pole (82°S) has been uncovered. It suggests the warmest mean month was 18.5°C about 90 million years ago. Today the warmest mean month for this location is about -20°C. Image Source: EarthSky (press release for Klages et al., 2020) Despite rapidly rising […]
Posted in Antarctic, Arctic, CO2 and GHG, Paleo-climatology |
By Kenneth Richard on 6. May 2021
Share this…FacebookTwitterIt’s considered canonical that global-scale atmospheric levels of CO2 from thousands of years ago can be precisely discerned just by examining air bubbles in ancient snow and ice from Antarctica. But an examination of the CO2 levels in modern snow and ice shows there are gigantic discrepancies between the measurements of CO2 in ice […]
Posted in Antarctic, CO2 and GHG, Paleo-climatology, Scepticism |
By Kenneth Richard on 3. May 2021
Share this…FacebookTwitterA new study (Kullman, 2021) suggests ~9000-year-old tree remains can be found buried in “currently empty snow hollows and glacier cirques” at elevations 600-700 m higher than where trees can grow today, implying a >3°C warmer Early Holocene climate. Treelines were still 75-100 m higher during the Medieval Warm Period…and even during the 15th […]
Posted in Arctic, Medieval Warm Period, Paleo-climatology |
By Kenneth Richard on 22. April 2021
Share this…FacebookTwitterA groundbreaking new study in Science suggests warm interglacial-like conditions (surface temperatures within 1°C of today’s) persisted from 54 to 42,000 years ago even though CO₂ levels idled around 200 ppm at that time. A sudden geomagnetic shift that intensified galactic cosmic rays and cloud formation and reduced ozone levels ~42,000 years ago resulted […]
Posted in Cooling/Temperature, Paleo-climatology, Solar Sciences |
By Kenneth Richard on 12. April 2021
Share this…FacebookTwitterScientists have determined the “optimal thermal conditions” for southwestern Greenland were when summer sea surface temperatures averaged about 12°C from 9,000 to 5,500 years ago, which is substantially warmer than modern summer temperatures (4.0-5.2°C) for this region. A few years ago McFarlin et al. (2018) determined northwestern Greenland was 4-7°C warmer than 1952-2014 during […]
Posted in Arctic, Paleo-climatology
By Kenneth Richard on 22. March 2021
Share this…FacebookTwitterClams’ feeding activity, calcification rates, and overall shell density have declined in concert with decreasing sea surface temperatures and the long-term falling sea level trend since the Holocene peak about 6000 years ago. A team of scientists (Cheli et al., 2021) have suggested Earth’s surface temperatures were “up to 4°C” warmer during the Holocene […]
Posted in Cooling/Temperature, Paleo-climatology, Sea Levels |
By Kenneth Richard on 8. March 2021
Share this…FacebookTwitterNortheast China has not been cooperating with the anthropogenic global warming narrative. A few years ago NE China was shown to be up to 7-9°C warmer than present during the Early Holocene (Zheng et al., 2018), when CO2 concentrations drifted around 260 ppm. Image Source: Zheng et al., 2018 Now two new studies indicate […]
Posted in Cooling/Temperature, Drought and Deserts, Paleo-climatology |
By Kenneth Richard on 4. March 2021
Share this…FacebookTwitterFrom 80,000 to 12,000 years ago, when CO2 concentrations lingered near or below 200 ppm, many new or recent studies suggest that when directly comparing region to region, it was as much as 6°C warmer than today even during this ice age period. This has prompted some scientists to “exclude atmospheric pCO2 as a […]
Posted in Paleo-climatology |
By Kenneth Richard on 11. February 2021
Share this…FacebookTwitterThe survivable temperature thresholds for terrestrial animals in both hemispheres affirm recent millennia were much warmer with less sea ice than today. Antarctica hasn’t warmed in the last 70 years (Singh et al., 2020). The Southern Ocean surrounding Antarctica has been cooling and sea ice has been expanding since 1979 (Fan et al., 2014; […]
Posted in Antarctic, Arctic, Cooling/Temperature, Glaciers, Paleo-climatology, Sea Ice |
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