Michael Mann and his team of data manglers like-minded scientists like to tell us the Medieval Warming Period was just a “regional” event rather than global, because if it was global, that destroys their narrative. This new study shows it also occurred in South America, and adds to the growing body of southern hemisphere locations. as we can see in this map below, note the red markers where it was warmer than normal. Sure seems global to me.
Interactive map source: https://www.google.com/maps/d/u/0/viewer?mid=1akI_yGSUlO_qEvrmrIYv9kHknq4&ll=18.92594518076072%2C-12.335967063733051&z=3
Preindustrial climate change in South America: the Middle Age was warm, glaciers shrank
By Dr. Sebastian Lüning and Prof. Fritz Vahrenholt
(German text translated/edited by P Gosselin)
The climate of the Middle Ages is still a mystery. In many parts of the world a warming period occurred, which can still not be satisfactorily simulated by the current climate models.
The problem: natural climate factors play almost no role in the models.
It is therefore all the more important to first carry out a proper mapping of the climate for this important period. A research group led by Sebastian Lüning has presented an overview of the medieval climate in South America and now appears in the journal Quaternary International.
Here the scientists summarized a large number of case studies of the entire continent. The climate archives included pollen surveys in lake sediments of the Andes, which documented the rise and drop of the tree line.
Other studies reconstructed the oscillating shrinking and growth of Andean glaciers or dealt with tree rings. As a result, Lüning and his team found that the vast majority of the 76 individual studies indicate warming during the early 2nd millennium. The Medieval Warm Period was also strongly represented in South America. Exceptions were some coastal waters, where increased buoyancy of cold water led to a cooling.
Full story here
Here is the paper:
The Medieval Climate Anomaly in South America
SebastianLüning. Mariusz Gałka, Florencia Paul, Bamontec Felipe, GarcíaRodríguezd, FritzVahrenholte
The Medieval Climate Anomaly (MCA) is a climatic perturbation with a core period of 1000-1200 AD that is well-recognized in the Northern Hemisphere (NH). Its existence in the Southern Hemisphere (SH) and the level of synchronicity with the NH is still a matter of debate. Here we present a palaeotemperature synthesis for South America encompassing the past 1500 years based on multiproxy data from 76 published land and marine sites. The data sets have been thoroughly graphically correlated and the MCA trends palaeoclimatologically mapped. The vast majority of all South American land sites suggest a warm MCA. Andean vegetation zones moved upslope, glaciers retreated, biological productivity in high altitude lakes increased, the duration of cold season ice cover on Andean lakes shortened, and trees produced thicker annual rings. Similar MCA warming occurred in coastal seas, except in the year-round upwelling zones of Peru, northern Chile and Cabo Frio (Brazil) where upwelling processes intensified during the MCA due to changes in winds and ocean currents. MCA warming in South America and the NH appears to have occurred largely synchronous, probably reaching comparable intensities. Future studies will have to address major MCA data gaps that still exist outside the Andes in the central and eastern parts of the continent. The most likely key drivers for the medieval climate change are multi-centennial Pacific and Atlantic ocean cycles, probably linked to solar forcing.”
“data manglers”
That’s catchy, I like it!
From my studies, the source of most of the global climate change seems obvious. North and South America separated from Europe and Africa very rapidly. That generated lots of super sonic steam and ash and lots massive tidal waves that flushed the world’s land masses. The brand new Atlantic Ocean was pretty hot. That hot water kept the earth covered with clouds preventing solar energy from getting in. So the land was cold due to lack of sunshine and the oceans were very warm. That caused massive hurricanes which came into the lands and created all of the snow which turned into the ice of the ice age. Once the oceans cooled, the hurricanes got smaller and less frequent and the ice age slowly retreated. I believe much of the global warming today is just the continued retreated of those glaciers. Those glaciers protect us from hot summers by melting. It takes tons of energy to melt ice (80 cal/ml). Glaciers keep our summers from overheating, but do little to make winters colder. So as the glaciers get smaller and smaller, our summers get hotter and drier. As for CO2, if we had more of it and less pollution in the air, our plants would grow bigger and better. The extra plant life would evaporate more water keeping us cooler and decreasing the intensity of droughts. I believe air pollution makes our trees and plants more diseased and that leads to faster death and that creates more deserts and reduces our forests. I believe air pollution is our major problem, not global warming. I think we need to focus on getting rid of most or all harmful air and water pollution. My conclusions for cleaning up the planet are the same. I just disagree with the causes of the problem and I disagree with pumping our CO2 waste into the ground. That is to survive and be more healthy, we need much cleaner air and water that what is available today. Currently our air is roughly 80% nitrogen and 20% oxygen with only traces of CO2 plus pollutants. It is those traces that cause health issues. It is proven that if we had cleaner air, we would be more healthy. The small amounts of CO2 in our air does not harm plants or animals, but it does provide materials needed for plant growth (CO2 and water plus sun are the majority of the basics of all living things). I think we need to focus on getting rid of what poisons our air and water. I like solar energy and solar panels because once installed, they are green and can work for 50 years or more generating enough electricity to displace tons and tons of coal and other pollutants. Now if we could have battery powered cars, the cars could connect to our grid day and night anytime they are not on the road and they could contribute much to the maintenance our our grid energy, supplying power to the grid when needed and charging from the grid when the grid has extra with the overall everyday average goal of maintaining car batteries at perhaps 50 to 80% full. Then add natural gas generation to back things up when days are cloudy, dark, and snowing.
Glaciers in Alaska have been shrinking long before the Industrial Revolution according to the National Park Service. Go up to Alaska and visit the glacier national park that is located south of Anchorage. As you drive into the park on your way to the major glacier, it gives dates and location showing the retreat of the glacier going back something like perhaps 300 years ago, and well before the Industrial Revolution started. I believe there is lots of evidence showing the retreat was happening as far back as there are records and those records go back well before the Industrial Revolution perhaps to the exploration and global mapping age in the 1600s to 1800s. As glaciers retreat, there is a stream of water that flows from the glaciers that eventually connect to other streams or the ocean. Some of those streams are very long and the evidence from the rock damage seem to indicate centuries and centuries of retreating based on current rates of retreating. But you can’t base things on current rates because as global warming warms things up, the retreat gets faster and faster. When the glaciers were a lot bigger, they had so much ice that should have protected them from rapid retreating. If you put 2 ice cubes in a barrel, each cube will melt a lot faster than if those two cubes were among 2000 cubes in that same barrel. Right now, we are down to 20 cubes left compared to what it was at the supposed end of the ice age or what it was several thousand years ago.