The Oligocene to the Quaternary: climate and biology - Climate Change: Biological and Human Aspects - page 158

(a)

-420

-425 '4.2 kiloyear event?'

-430

Younger Dryas

-435

-440

-445

'8.2 kiloyear
event?'

-450

Holocene

-455

Allerød & Bølling

-460

0 2000 4000 6000 8000 10 000 12 000 14 000 16 000

Age (years)

(b)

12

Holocene

10

8 Younger Dryas

MCA

'8.2 kiloyear event'

6

Allerød & Bølling

4

2

0

0 2000 4000 6000 8000 10 000 12 000 14 000 16 000

Age (years)

Fig. 4.12 (a)Vostokdeuteriumrecordoverthepast15000years,relectingAntarcticregionaltemperaturechange(data

areshownasdeuterium[Du]inpartsperthousandcomparedtoStandardMeanOceanWater[SMOW]
deuterium).DatafromPetitetal.(2001), VostokIceCoreDatafor420,000Years ,IGBPPAGES/WorldDataCenter
forPaleoclimatologyDataContributionSeries#2001-076.NOAA/NGDCPaleoclimatologyProgram,Boulder,
CO,USA.Regardingmajorglacialandinterglacialheatchangeandexchangebetweenhemispheresviathe
Broeckeroceancirculationthereisatimedelay(seesection4.5.3).Butthereisalsomoreimmediate,albeit
weak,atmosphericheatexchange.Forthisreasoncoulditbethatsomenorthernhemisphereclimateevents
arerelectedinthesouthernhemisphereAntarcticrecord?(Possiblynot?)(b)Greenlandice-coreelectrical
conductivityoverthepast15000yearsrelectingNorthAtlanticArcticprecipitation,andhence-indirectly-
temperature.MCA,medievalclimaticanomaly.Datasource:IGBPPAGES/WorldDataCenterfor
Palaeoclimatology;asusedinTayloretal.(1993).Seesection4.6.3foradiscussionaboutthe8.2kiloyear
event.