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| Dark Ages Cold Period | |
|---|---|
| Name | Dark Ages Cold Period |
| Period | ca. 6th–9th centuries CE |
| Region | Northern Hemisphere; Eurasia; North Atlantic |
| Preceding | Late Antique Little Ice Age |
| Succeeding | Medieval Warm Period |
| Primary proxies | Ice core, Tree ring, Glacier, Speleothem |
| Notable events | Late Antique Little Ice Age, Extreme weather events 535–536, Volcanic winter of 536 |
Dark Ages Cold Period The Dark Ages Cold Period describes a phase of cooler climate conditions centered on the sixth to ninth centuries CE, associated with shifts in North Atlantic Oscillation, glacier advance, and documented crop failures. Scholars integrate evidence from Prokopius, Cassiodorus, Theophanes the Confessor, Irish Annals, and material records from Greenland Norse settlements to reconstruct its timing and impacts. Multidisciplinary studies draw on GISP2, NGRIP, Siberian proxies, Alpine ice cores, and archaeological datasets from Byzantium to Carolingian Empire contexts.
Definitions vary among researchers using radiocarbon dating from IntCal curves, varve chronologies from Lake Ohrid, and dendrochronology from Brandenburg and Iceland. Chronologies often center on the 536 CE eruption sequence recorded by Prokopius and Procopius (texts referenced by Michael McCormick), with extended cooler conditions through the 7th–8th centuries and punctuated events into the 9th century during the rise of Charlemagne. Key dated markers include sulfate peaks in Gardar, GRIP, GISP2 and abrupt tree-ring narrow rings in Central Europe, Scandinavia, and Anatolia.
Proposed drivers include large volcanic eruptions recorded in Mount Rinjani and Ilopango tephra layers, solar minima reconstructed from IntCal and Steinhilber reconstruction, and shifts in Atlantic Meridional Overturning Circulation inferred from foraminifera assemblages off Iberian Peninsula. Stratospheric aerosols from eruptions explain radiative forcing signatures seen in Antarctic and Greenland ice, while changes in Pacific Decadal Oscillation and North Atlantic Oscillation modes modulated regional cooling over British Isles, Frankish Gaul, Iberia, and Scandinavia. Climate models run on platforms developed by groups like Paleoclimate Modelling Intercomparison Project simulate combined volcanic and solar forcing reproducing multi-decadal cooling and altered precipitation over Carpathians and Iberian Peninsula.
Northern Europe shows glacier advances in the Alps and expansion recorded in Swiss and Austrian moraines, with tree-ring chronologies from Germany, Sweden, and Finland indicating reduced growth. Icelandic sagas and settlement layers at Reykjavík provide archaeobotanical and tephra evidence. In Greenland, Norse farm abandonment at Brattahlíð coincides with sea-ice proxy shifts from Paleoceanography cores near Cape Farewell. Eastern Mediterranean records in Constantinople and Antioch show famines described by Procopius and John of Ephesus alongside speleothem isotopes from Saklı cave. North African records from Algeria and Carthage indicate changing Nile and rainfall patterns tied to Sahara dust records and pollen sequences from Lake Tunis.
Contemporary chroniclers such as Cassiodorus and Procopius describe crop failures and food price spikes affecting Byzantine provisioning and Sassanid Empire logistics. In Frankish territories, subsistence crises occurred during Carolingian transformations with documented grain shortfalls in capitularies and accounts associated with Charlemagne and later Louis the Pious. Migration and settlement shifts are recorded in Anglo-Saxon Chronicle, relocations in Ireland annals, and colonial stresses in Vinland-era narratives tied to Norse adaptation in Greenland. Adaptive responses included diversification of agricultural regimes in Brittany and Catalonia, enhanced grain storage in Lombard estates, and shifts in pastoral practices recorded in Byzantine legal texts and Tang dynasty grain tribute accounts.
The period is often compared to the Late Antique Little Ice Age (mid-6th century) and later Medieval Warm Period (10th–13th centuries). Volcanic forcing during 536–545 CE produced global anomalies similar in mechanism to later events such as the Samalas eruption of 1257 and the Tambora eruption of 1815, though differing in magnitude and persistence. Proxy records contrast Dark Ages cooling with the Roman Warm Period and the Little Ice Age (13th–19th centuries), highlighting variations in spatial extent across Asia, North America, and Africa through multiproxy syntheses led by initiatives like PAGES.
Debate centers on the spatial coherence of cooling, the relative roles of volcanic versus solar forcing, and the socioeconomic causality inferred from documentary records. Historians such as Michael McCormick argue for strong climatic influence on migration and collapse, while climatologists using high-resolution climate models and datasets from PAGES 2k emphasize complex teleconnections and regional heterogeneity. Methodological disputes involve chronological alignment between Annales Cambriae entries, dendrochronological anomalies, and sulfate layers in GRIP and NEEM cores. Ongoing research integrates isotopic analyses from Speleothems, genomics from ancient DNA studies in Ötzi-era contexts, and archaeological survey in Iberia and Anatolia to refine causation narratives.
Category:Climate history