Medieval Climate Anomaly Now Confirmed In Southern Hemisphere On All Four Continents

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In Medieval times, the penguins had it nice and warm

By Die kalte Sonne
(German text translated in the English by P Gosselin)

Image Source: Lüning et al. 2019

For a long time it has been said that the Medieval Warm Period was a purely North Atlantic phenomenon. This has proved to be wrong.

On 29 June 2019, a paper by Lüning et al. 2019 on the Medieval Warm Period in Antarctica appeared in the trade journal Palaeogeography, Palaeoclimatology, Palaeoecology. Here is the abstract:

The Medieval Climate Anomaly in Antarctica
The Medieval Climate Anomaly (MCA) is a well-recognized climate perturbation in many parts of the world, with a core period of 1000–1200 CE. Here we are mapping the MCA across the Antarctic region based on the analysis of published palaeotemperature proxy data from 60 sites. In addition to the conventionally used ice core data, we are integrating temperature proxy records from marine and terrestrial sediment cores as well as radiocarbon ages of glacier moraines and elephant seal colonies. A generally warm MCA compared to the subsequent Little Ice Age (LIA) was found for the Subantarctic Islands south of the Antarctic Convergence, the Antarctic Peninsula, Victoria Land and central West Antarctica. A somewhat less clear MCA warm signal was detected for the majority of East Antarctica. MCA cooling occurred in the Ross Ice Shelf region, and probably in the Weddell Sea and on Filchner-Ronne Ice Shelf. Spatial distribution of MCA cooling and warming follows modern dipole patterns, as reflected by areas of opposing temperature trends. Main drivers of the multi-centennial scale climate variability appear to be the Southern Annular Mode (SAM) and El Niño-Southern Oscillation (ENSO) which are linked to solar activity changes by nonlinear dynamics.

With the publication of this paper, the Medieval Climate Anomaly (MCA) has now been confirmed on all four continents of the southern hemisphere. While the largest part of the southern hemisphere apparently experienced a warm phase during the MCA, there were also isolated areas that cooled down. To the latter regions belong, for example, coasts, where cold water from the depth rose increasingly. In other areas so-called climate seesaws or dipoles were active, as we know them from today’s climate. One end of the “seesaw” heats up, the other end cools down.

Another result of the studies is that the medieval climate history of huge areas in the southern hemisphere is simply unknown. A task force urgently needs to be set up to fill in this climatic “empty space” with information on pre-industrial temperature development. This information is urgently needed to calibrate the climate models on the basis of which far-reaching socio-political planning is currently taking place.

What follows are publications on the Medieval Period climate of the southern hemisphere as an overview:

Lüning, S., M. Gałka, F. Vahrenholt (2019): The Medieval Climate Anomaly in Antarctica. Palaeogeogr., Palaeoclimatol., Palaeoecol., doi: 10.1016/j.palaeo.2019.109251

Lüning, S., M. Gałka, F. García-Rodríguez, F. Vahrenholt (2019): The Medieval Climate Anomaly in Oceania. Environmental Reviews, online Just-IN, doi: 10.1139/er-2019-0012

Lüning, S., M. Gałka, F. P. Bamonte, F. García-Rodríguez, F. Vahrenholt (2019): The Medieval Climate Anomaly in South America. Quaternary International, 508: 70-87. doi: 10.1016/j.quaint.2018.10.041.

Lüning, S., M. Gałka, F. Vahrenholt (2017): Warming and cooling: The Medieval Climate Anomaly in Africa and Arabia. Paleoceanography 32 (11): 1219-1235, doi: 10.1002/2017PA003237.

All supporters of the studies once again receive our deepest thanks. At the start of the project, a devoted crowdfunding team gave the studies a strong boost.

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12 responses to “Medieval Climate Anomaly Now Confirmed In Southern Hemisphere On All Four Continents”

  1. sasquatch

    It is important to keep accurate records. Don’t be fudging the data in any way. Always better to be honest about what you do, otherwise, you might have to pay a high price.

    “Pity the poor navigator who fell asleep on watch and failed to update his ship’s logbook every four hours with details about its geographic position, time, date, wind direction, barometric readings, temperatures, ocean currents, and weather conditions. If he was with the British Royal Navy, the penalties could be harsh; it was—and still is—a serious offense to falsify the data in a logbook. (For example, sleeping on watch—a practice that could lead to logbook-faking—was historically considered a crime punishable by death, according to item 26 of the statutes of the British Admiralty’s Articles of War.) “Anything you read in a logbook, you can be sure that it is a true and faithful account,” said Clive Wilkinson of the UK’s National Maritime Museum.”

    Old Weather

    “The potato’s story begins about 8,000 years ago near Lake Titicaca, which sits at 3,800 m (12,500 ft) above sea level in the Andes mountain range of South America, on the border between Bolivia and Peru. There, research indicates, communities of hunters and gatherers who had first entered the South American continent at least 7,000 years before began domesticating wild potato plants that grew around the lake in abundance.”

    Andean Potato History

    Potatoes do not grow well in too hot of temperatures and need lower temperatures for optimum growth.

    The climate at lower elevations 8000 years ago maybe had temperatures that might have inhibited the growth of potato plants, probably the reason potatoes were grown at higher elevations.

    Sure do have a great potato crop this year.

    1. sasquatch
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  3. Denis Ables

    This should eliminate all credibility from every alarmist who DENYs the MWP was global and at least as warm as now.

  4. Denis Ables

    It’s time to make the alarmist DENIERS (that MWP was global and as warm as now) sweat! Once it is recognized that other natural forces were at work during the MWP, it becomes plausible to consider that the same forces may be at work again.

    All the arguments about Greenland and Arctic ice melting/growing, etc., is never ending and serves as a foggy cover for the alarmists to continue wringing their hands. It’s time to ask for EVIDENCE that co2 has ever had any impact on the global temperature, even over geologic periods when it was 10 to 20 times higher.

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