Physical geography of the Netherlands

Fysische geografie van Nederland Hoofdstuk 4 Onderzoek van het landijs van het boek Fysischgeografisch onderzoek

Isotopen-onderzoek Stabiele isotopen van zuurstof: 16 O 99,760 % 17

O 0,037 % 18 O 0,203 % Verhouding isotopen in waterdamp en

calciet is afhankelijk van temperatuur; hoe kouder hoe minder zware isotopen (18O). Isotopen-onderzoek Ten behoeve van metingen is vergelijking nodig met

een standaard: O/16O sample - 18O/16O standard 18O = ------------------------------------------------. 103 o/oo 18

18 O/16O standard Berendsen 2010

Naar Dansgaard et al. 1971 Onderzoek landijs O / 16O-verhouding (18O) hangt af van: 18

klimaat lokale T

geografische breedte hoogte seizoen afstand tot brongebied

Isotopen-onderzoek Tijdens glaciaal: relatieve toename van 16O op ijskappen, en relatieve toename 18O in de diepzee

Tijdens interglaciaal: relatieve afname van 16O op ijskappen, en relatieve afname 18O in de diepzee

Leinders et al. 1993 Isotopen-onderzoek Hoe kunnen we hiermee een klimaatcurve maken? Meting 18O

Meting ouderdom NOAA Onderzoek landijs Dateringen van ijs

14C (AMS-dateringen) zomer/winter gelaagdheid van sneeuw, of stof stromingsmodellen accumulatiesnelheid constant

ijsdikte constant stromingspatroon constant Foto: H.J.A. Berendsen INSTAAR

Berendsen 2010 Naar Dansgaard et al. 1973 NOAA

De Groenlandse ijskap Foto: N. Willemse Drill bit of ice corer

NOAA NOAA NOAA

NOAA GISP ice core annual layering NOAA

Berendsen 2010, naar Dansgaard et al. 1973 Ruddiman 2001 Berendsen 2010

Naar Barnola et al. 1991

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