Sentences with phrase «peaks during interglacial»
The discovery in ice core records that atmospheric concentrations of two potent greenhouse gases, carbon dioxide and methane, have decreased during past glacial periods and peaked during interglacials indicates important feedback processes in the Earth system.
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Previous estimates suggested that peak temperatures during the warmest interglacial periods — which occurred at around 125,000, 240,000 and 340,000 years ago — were about three degrees higher than they are today.
Other studies indicate that the peak sea level during the latest interglacial was a few metres higher than today, implying that peak temperatures were higher.
During this period, global temperatures were 1.5 - 2.0 °C warmer than the peak warmth of the present interglacial, or Holocene, in which we are now living.
Once a temperature threshold is breached, abrupt events follow due to amplifying feedbacks, even within a few years, examples being (1) freeze events which followed temperature peaks during past interglacial peaks due to influx of cold ice - melt water into the north Atlantic Ocean; (2) the Dansgaard — Oeschger warming events during the last glacial period; (3) the Younger dryas stadial freeze and the Laurentian stadial freeze.
Sea level in the Eemian interglacial peaked some 6 — 9 meters higher than it's ever been during the Holocene.
The observation that led to his conclusion was that in the ice core records during interglacials methane rises to a peak and then decreases as temperature rises and falls.
During this interglacial, methane rose, peaked, started to decrease and then stopped decreasing and began increasing again starting about 5,000 years ago.
During the Last Interglacial Period (about 129,000 to 116,000 years ago) when peak global warmth was not more than 2 °C above pre-industrial temperatures, and peak global annual sea surface temperatures were 0.7 [0.1 to 1.3] °C warmer (medium confidence), maximum GMSL was at least 5 m higher than at present (very high confidence), but did not exceed 10 m (high confidence).
The Earth must be in radiative (energy) balance within a very small fraction of 1 W / m2 averaged over the current interglacial period as well as during the peak of the last ice age 20,000 years ago.