The Medieval Warm Period was originally proposed by Hubert Lamb in 1965.
The Medieval Warm Period (MWP) is generally thought to have occurred from about AD 950–1250, during the European Middle Ages.
In 1965 Hubert Lamb, one of the first paleoclimatologists, published research based on data from botany, historical document research and meteorology combined with records indicating prevailing temperature and rainfall in England around 1200 and around 1600.
Hubert Horace Lamb (born Bedford 22 September 1913 – died Holt, Norfolk 28 June 1997) was an English climatologist who founded the Climatic Research Unit in 1972 in the School of Environmental Sciences at the University of East Anglia.
Most of Lamb’s scientific life was spent at the Meteorological Office, UK, where he started as a Technical Officer by special merit promotion.
The evidence Hubert Lamb accumulated in support of his proposed Medieval Warm Period did not include any deep ice core evidence.
Evidence has been accumulating in many fields of investigation pointing to a notably warm climate in many parts of the world, that lasted a few centuries around A.D. 1000–1200, and was followed by a decline of temperature levels till between 1500 and 1700 the coldest phase since the last ice age occurred.
The Early Medieval Warm Epoch and Its Sequel
H. H. Lamb – Meteorological Office, Bracknell
Elsevier Publishing Company – 1965
Received September 14, 1964
Resubmitted January 22, 1965
Three cores were attempted at Camp Century in 1961, 1962, and again in 1963.
The third hole was started in 1963 and reached 264 m.
The 1963 hole was re-entered using the thermal drill (US) in 1964 and extended to 535 m.
In mid-1965 the thermal drill was replaced with an electro-mechanical drill, 9.1 cm diameter, that reached the base of the ice sheet in July 1966 at 1387 m.
The evidence Hubert Lamb referenced in support of his proposed Medieval Warm Period did include Climate Through The Ages by C E P Brooks which was first published in 1926 and then subsequently revised in 1949.
Intriguingly, the work of C E P Brooks suggests Hubert Lamb merely hyped the wiggles in the established mainstream [trending downwards] temperature record when he proposed the Medieval Warm Period.
Climate Through The Ages
C E P Brooks
Ernest Benn Limited – 1950
More importantly, C E P Brooks let the cat out of the bag when he stated that since “the beginning of the Christian era” there is “a rich European literature” which provides a “wealth of material” for climate research.
Since the beginning of the Christian era, there is a rich European literature which provide a wealth of material.
Climate Through The Ages
C E P Brooks
Ernest Benn Limited – 1950
The British contribution to this “wealth of material” includes several archive trawlers who assembled long lists of events all the way back to the Anglo Saxon Chronicles.
Sadly, most of these events were manufactured by the monasteries when they originated the Anglo Saxon Chronicles during the reign of Queen Elizabeth I.
The systematic analysis of manuscripts containing versions of the text known as the Anglo-Saxon Chronicle originated during the reign of Queen Elizabeth I, as part of an attempt to assemble and organise information about the available sources for English history.
In 1565 (or thereabouts) John Joscelyn, chaplain and Latin secretary to Matthew Parker, archbishop of Canterbury, constructed a list of six manuscripts each designated ‘Chronica Saxonica’.
He arranged his list in an order determined by the point at which each chronicle ended (977, , 1006, 1066, 1080, 1148), numbering them accordingly (1–6), indicating in each but one case the manuscript’s apparent or supposed place of origin, and identifying its current owner.
Manuscripts of the Anglo-Saxon Chronicle Volume 1: c.400–1100
The Cambridge History of the Book in Britain Volume 1: c.400–1100
Edited by: Richard Gameson – 2011
See: Birthing Beowulf
Nonetheless, this wealth of fabricated evidence turned archive trawling into a veritable cottage industry based upon selective repetition, reinterpretation and refutation [as illustrated by the year 1014 AD in the following extracts].
A general chronological history of the air, weather, seasons, meteors, &c.
T Longman and A Millar – 1749
Natural Phenomena and Chronology of the Seasons
Edward Joseph Lowe
Bell and Daldy – 1870
Short refers to a remarkable calamity in this year.
He says ‘a heap of cloud fell and smothered thousands’.
He adduces the Anglo-Saxon Chronicle as authority for this phenomenon, a work in which
there is certainly no mention of it.
It might conceivably be a poetic distortion for a heavy rainstorm in which many people were drowned.
A Meteorological Chronology to AD 1450
C E Britton
Geophysical Memoirs No 70, HMSO, London – 1937
Needless to say, both C E P Brooks and Hubert Lamb tapped into this fabricated wealth of selective repetition, reinterpretation and refutation by referencing A Meteorological Chronology to AD 1450 by C E Britton.
Kieran Hickey generated statistics from this “wealth of material” for [amongst other things] the Total Number of North Sea Floods which indicate there was either a dearth of events before the Heinson Horizon or the monasteries had little interest in fabricating backdated events for the period before the Heinson Horizon.
Documentary Records Of Coastal Storms In Scotland, 1500-1991 A. D. Volume I
Kieran Richard Hickey
Coventry University – March 1997
However, where there are neither strata nor tree samples the myopic mainstream has managed to unearth an estimated 269,636 European manuscripts in The Academic Abyss.
The Heinsohn Horizon: The Academic Abyss
The Old Japanese Cedar analysed by Leona Libby in 1976 suggests the Roman Warm Period was interrupted by a catastrophic event in the 930s AD but the release of retained heat in the Earth’s oceans enabled the climate to temporarily recover by [about] 1000 AD.
Thus, the Medieval Warm Period was a temporary continuation of the Roman Warm Period that was very rudely interrupted at the Heinson Horizon.
See: Isotopic Tree Thermometers and The Heinsohn Horizon
See: The Roman Warm Period
However, the recovery of the climate after the Heinson Horizon was short lived because the the oceans could only release retained heat until they regained some semblance of equilibrium with the Earth’s new Axial Tilt which was altered by about 4° at the Heinson Horizon.
Peter James has provided some interesting support for this re-analysis by estimating that today’s parallel of latitude have deviated by about 4° since the time of Hipparchus [circa 190-120 BC].
Therefore, an Axial Tilt of 19.4° before the Heinsohn Horizon explains:
1) Why the Roman Warm Period [250 BC to 400 AD] was “2° C warmer” than now.
2) Why the Roman Warm Period peaked [150 AD] close to the Heinsohn Horizon.
Conversely, an Axial Tilt of 23.4° after the Heinsohn Horizon explains:
3) Why the Camp Century Ice Sheet in Greenland only started to grow after 930 CE.
4) Why Trepidation data shows Axial Tilt starting to reverse about 885 CE.
See: Heinsohn and The Eclipse Record
Comparing the inflection points in the Old Japanese Cedar chronology with those of the Carbon 14 Chronology extracted from the Irish Oaks indicates these chronologies are well synchronised and in broad agreement.
See: A Carbon-14 Chronology
If the GISP 2 Ice Core chronology is accepted at face value [and in isolation] then it’s possible to visualise a scenario where the Roman Warm Period is interrupted by the Heinsohn Horizon before being temporarily reprised as the Medieval Warm Period.
The Younger Dryas Cold Interval as Viewed from Central Greenland
Richard B Alley
Quaternary Science Reviews – Volume 19 Issues 1-5 – 1 January 2000 – Pages 213-226
However, it is extremely unlikely the Greenland Ice Sheet Chronologies are valid because they are based upon extremely ludicrous theoretical foundations.
However, if you don’t believe ice sheets suddenly materialise overnight fully formed then that opens up the possibility that the Greenland Ice Sheet grew and developed so that it could eventually smother most of the great Greenland basin in snow and ice.
The Great Greenland Snow Job – 06 – The $64,000 Question
Revisiting the data from the deep ice cores provides an opportunity to construct an indicative North-South cross-section of the ice sheet that roughly follows the arching “spine” of the Greenland Ice Sheet through 12 degrees of latitude.
The profile clearly indicates the ice layers within the ice sheet do not follow horizontal bands as assumed by the flow model used to create the Holocene Hockey Stick chronology.
The Great Greenland Snow Job – 07 – Bending Time
Therefore, a more likely scenario for the Greenland Ice Sheet Chronologies can be established by performing an inflection point analysis between the Old Japanese Cedar and GISP 2 Ice Core chronologies.
The validity of this approach is demonstrated by comparing the mainstream Solar Activity chronology with the GISP 2 Ice Core temperature chronology.
The fit between Solar Activity and Greenland temperatures would probably be significantly improved if the Solar Activity Carbon 14 values weren’t calibrated [aka fudged].
Which just goes to show: That you don’t know what you’ve got ‘Til it’s gone*.
* “It” being Settled Science.