By Kenneth Richard on 18. July 2022
Due to a “relatively stable warm climate” the Medieval Warm Period (800 to 1300 CE) was a period of expanding Scandinavian population, increasing trade, food and goods production. There has been a ~500 zettajoule (ZJ) increase in global ocean heat energy since 1750. The Medieval Warm Period global ocean had 1000 ZJ more heat energy […]
Posted in Medieval Warm Period, Paleo-climatology |
By Kenneth Richard on 14. July 2022
The Western North Pacific has continued cooling over the last millennium, with no reversal in trends after the Little Ice Age. Earlier this year we highlighted a study showing corals thrive in multiple-degrees-warmer-than-today waters and their growth is stunted in cooler environments. Corals in the Western North Pacific near Japan were far more abundant than […]
Posted in Cooling/Temperature, Paleo-climatology |
By Kenneth Richard on 11. July 2022
A new study (Boulila et al., 2022) suggests “abrupt and severe changes in Earth’s past climate” have been occurring at ~1,500-year periodicities since the iceless Jurassic period. Warming events of degrees C per within decades or less were at one time thought to have occurred only at locations like Greenland and the North Atlantic during […]
Posted in Paleo-climatology |
By Kenneth Richard on 4. July 2022
These much warmer Greenland temperatures imply that the elevation of the ice sheet was 400 meters lower than it is today from about 6,000 to 10,000 years ago. Scientists (Westhoff et al., 2022) report that the two largest Greenland melt events in the last few hundred years occurred in 2012 and in 1889 CE – […]
Posted in Arctic, Glaciers, Medieval Warm Period, Paleo-climatology |
By Kenneth Richard on 9. June 2022
Several new and recent studies have affirmed that the waters surrounding South America – from Peru to Chile to Argentina to Brazil – were several degrees warmer and sea levels multiple meters higher than today until the Little Ice Age centuries. A new study suggests ~4,000 to 5,000 years ago coastal Argentina’s sea surface temperatures […]
Posted in Cooling/Temperature, Oceans, Paleo-climatology, Sea Levels |
By Kenneth Richard on 26. May 2022
A new study (Gao et al., 2022) suggests Antarctica’s sea levels (Ross Sea) were more than 16 meters higher than today ~5,000 years ago and still 5.5 meters higher ~3,000 years ago. Penguins thrived with the warmer climate and diminished sea ice. Image Source: Gao et al., 2022 “Since 1.5 kyr BP, with further contraction […]
Posted in Antarctic, Paleo-climatology, Sea Levels |
By Kenneth Richard on 9. May 2022
Global sea surface temperatures have only been warming at a rate of about 0.06°C per decade since 1950. According to Dieng et al., 2017, global sea surface temperatures (SST) cooled slightly (-0.006°C/decade) from 2003 to 2013. This reduced the overall 1950-2014 warming rate to 0.059°C per decade. Image Source: Dieng et al., 2017 The NCAR/HadCRUT4 […]
Posted in Oceans, Paleo-climatology |
By Kenneth Richard on 28. April 2022
If decadal- and century-scale glacier advance and retreat is strongly indicative of a region’s climate, glacier behavior in Iceland saps the narrative that says anthropogenic CO2 is a climate driver. Per a new study, many of the northern Icelandic glaciers in existence today had “disappeared” from about 10,000 to 6,000 years ago. At the time, […]
Posted in Climate Sensitivity, Glaciers, Paleo-climatology |
By Kenneth Richard on 4. April 2022
Recent reconstructions suggest CO2 concentrations may have ranged between 150 and 600 ppm (or more) throughout the last 4 million years. We routinely see screaming headlines such as CO2 in the Atmosphere Climbs to Highest Level in 4.5 Million Years or Carbon Dioxide Levels Reach Highest Point in Human History. However, these claims that modern […]
Posted in CO2 and GHG, Paleo-climatology |
By P Gosselin on 29. March 2022
A new paper published in open access publishing MDPI looks at seven prominent hemispheric and global temperature reconstructions for the past 2000 years (T2k). The analysis conducted by the authors found that some reconstructions “differed from each other in some segments by more than 0.5 °C” whilst some show negligible pre-industrial climate variability (“hockey sticks”). […]
Posted in Paleo-climatology |
By P Gosselin on 27. March 2022
Analysis of 1000 years of European wars finds that more war and conflict are not linked to warm climates. One of the scare stories used by the global warming alarmists is the claim that climate extremes produced by manmade climate change will lead to greater strife and more bloody wars. Hat-tip: Klimaschau But that assumption […]
Posted in Alarmism, Climate Politics, Paleo-climatology |
By Kenneth Richard on 24. March 2022
From about 14,000 to 12,000 years ago, when CO2 hovered around a “safe” ~240 ppm, Siberian Arctic July temperatures reached ~8 to 12°C, which is at least 4°C warmer than today (Andreev et al., 2008). Grass grew 300-350 days a year in the late stages of the last glacial in the Siberian Arctic. This allowed […]
Posted in Arctic, Paleo-climatology |
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