Dating tree cores

Whilst the Antarctic is a continent, the only major area of land in the Arctic covered with snow is Greenland.There have been several ice cores drilled in Greenland but these core do not go as deep as those in the Antarctic.Figure 6 shows the temperature for both the EPICA and the Vostok sites, which indicated that the temperature records are in good agreement for most of the time.Before approximately 200,000 years ago there was some divergence in the estimate age but as can be seen in Figure 6 these differences are well within the range of likely errors.Figure 8 shows the levels of Oxygen-18 from the Nevado Huascaran glacier in the Peruvian Andes.Levels of Oxygen-18 are positively correlated with temperature but this is reported not to be as accurate as when deuterium is also used in the calculation.

Indeed, dating information is sometimes given for the “ice age” and “gas age”.

Despite all of these limitations, it is generally accepted that ice cores give a good representation of temperature over very long periods.

They are able to answer such questions as what drives the cycle of ice ages and warm periods and what is the role of CO2 in long-term climate change.

Although not clear from this chart there is general agreement that temperature changes precede CO2 changes during the rising phase and CO2 lags temperature by a larger amount during the falling phase.

Figure 4 and Figure 5 show similar relationships for the Vostok ice core (note: EPICA ad Vostok are both in the Antarctic).

Search for dating tree cores:

dating tree cores-3dating tree cores-27

Leave a Reply

Your email address will not be published. Required fields are marked *

One thought on “dating tree cores”

  1. Vele da su dosli da nas registruju i da ce se promijeniti stanje u kojem smo se nalazili,popisace nas sto bi se reklo svaki zatoceni civil bit ce registrovan i dobice karticu sa registarskim brojem..da ce nam obezbijediti odijecu i obucu te da cemo dobiti deke a sto je za nas bilo najbitnije dobicemo hranu dva puta na dan....dobicemo i lijekove....vijest ljepsa od ljepse ...pojavljuje se tracak nade da ce neko da prezivi ...u najljepsoj prici nejma mijesta za ubijanja,maltretitanja i drugo a vi koji citate znate vec na koga i sta mislim...sam ja u prilici i mogucnosti zbog posla koji obavljam da saznam friske vijesti medju prvima....stize haber da je dosla jedna doktorica iz Svicarske te da ce se ista starati oko nas zatocenih te dace provesti vise vremena sa nama,koliko nezna niko a i nepita niko...navedena nezna bosanski jezik sa istom doci ce svakodnevno i prevodioc...se radilo o osobi koja je vezana poslom za medicinu,moje kompetencije i znanje su vrlo male..postoji jedan doktor koji je joz ziv a to znaci da ce doktor MENSUR imati sto bi se reklo pune ruke posla....neznam tacno gdje je doktor upozno gospodjicu iz Svicarske ali znam da sam prvi put vidio doktora ne sa jednom vec sa dvije dame.