Presumably you got this claim from the wikipedia article, if you actually read the paper cited this would have been revealed to be a misleading claim as the first figure prominently shows.
Fig. 1 shows some oscillations lasting a few decades in length but by the nature of oscillations they reverted back to the baseline within that time period. Actual lasting changes in the measured values primarily occurred in the period from roughly 14.7 ka BP to 12.8 ka BP.
In fact this interval is prominently highlighted by the paper authors via a different background color on the chart.
Since I am not your editor I will leave off here and let your editor correct any further mistakes.
Presumably you got this claim from the wikipedia article, if you actually read the paper cited this would have been revealed to be a misleading claim as the first figure prominently shows.
See https://escholarship.org/uc/item/6n89h7c3#metrics
Fig. 1 shows some oscillations lasting a few decades in length but by the nature of oscillations they reverted back to the baseline within that time period. Actual lasting changes in the measured values primarily occurred in the period from roughly 14.7 ka BP to 12.8 ka BP.
In fact this interval is prominently highlighted by the paper authors via a different background color on the chart.
Since I am not your editor I will leave off here and let your editor correct any further mistakes.