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ka = thousands of years
At Lake JR01 from the Boothia Peninsula, Nunavut, ( Canada ) chironomid-inferred mean July air temperatures were warmest in the mid-Holocene, reaching as high as 7.5° C. Temperatures decreased over the course of the mid- to late-Holocene. Overall terrestrial and aquatic production, as indicated by chironomid, pollen and diatom concentrations and accumulation rates, as well as sediment organic and biogenic content, were higher prior to 5.0 ka than at any other time in the Holocene. The diatom community assemblages during the mid-Holocene also indicate that this was a warm period in the lake’s history. Between 5.0 and 1.0 ka, the lake was cooler and less productive. Inferred temperatures, based on both the chironomid and the pollen records, indicate additional cooling between 0.46 and 0.36 ka that corresponds to the Little Ice Age (LIA).
During the Early and Middle Holocene … focus is on the implications of the four major climate cold anomalies that have recently been identified as key time-windows for global RCC ( Rapid Climate Change ) ( Mayewski et al. 2004). These cooling anomalies are well-dated, with the following precise time-intervals for archaeological RCC research: (i) 8.6–8.0 ka, (ii) 6.0–5.2 ka, (iii) 4.2–4.0 ka and (iv) 3.1–2.9 ka ….
Geochronometry: A branch of geochronology that deals with the quantitative (numerical) measurement of geologic time. The abbreviation ka – for thousand
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