Dryas were known as the
return to cold conditions
from 12,900-11,500 years ago. Paleoclimatic data shows this through
data that indicate that forests which had recently developed in Europe
during the aborted warming following the ice ages were suddenly
again by artic shrubs, herbs and grasses, and Greenland ice cores
a local cooling of about 6 degrees C during this event.
Following the Younger Dryas is the present warm epoch, known geologically as the Holocene Interglacial.
Holocene started suddenly around
11,500 years ago.
Greenland ice cores recorded a striking sudden cooling event about
years ago. This cooling event gave cool, dry conditions that lasted
200 years, before there was a rapid return to conditions warmer and
than today. In addition, this cooling shows up in records from North
across southern Asia as a phase of arid conditions due to failure of
monsoon rains. Furthermore, the cold and aridity also looks like it hit
northernmost South America, Eastern North America, and parts of North
1250-1850 AD= The Little Ice Ages
Following the Holocene there was a "Medieval Warm Period" which was followed by a longer span of considerably colder climates, often termed the "Little Ice Age" which was when the global mean temperature may have been 0.5 +/-1.0 degrees C colder than today.
evidence shows that
Alpine glaciers moved
into lower elevations, rivers that rarely freeze today were often
ice-covered in the winter time, and precipitation patterns also changed
in many regions.
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