Earth Sciences Forum

Andre · Last edited by Andre on Fri Nov 02, 2007 11:08 am; edited 1 time in total

Actually this thread is not about the Younger Dryas directly but we compare it with the interval of about 17,500 - 14,500 years ago.

The significance is clear when looking at the isotope anomaly between the poles, a "warming" South versus a "cooling" North, that is if we believe the isotopes:

Denton et al 2006 write:

Andre · Posted: Tue Aug 21, 2007 7:27 pm Post subject:

A bunch more about the Mystery interval, not mentioned by Denton et al. Since this period is not biased with massive glacial readvances, there is a chance that it is better acceptable that the Greenland Ice cores are not telling about the warming in that period.

scpg02 · Joined: 22 Jul 2007 Posts: 221 Location: Sacramento

Andre · Posted: Tue Aug 21, 2007 8:16 pm Post subject:

Lucky you. Smile

I live on a "mountain", currently, The "Heuberg", elevation 3150 ft. This is within a few miles distance:

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scpg02 · Joined: 22 Jul 2007 Posts: 221 Location: Sacramento

Donner Pass

Donner Pass (el. 7,085 ft. / 2,160 m.) is a high mountain pass in the northern Sierra Nevada, located above Donner Lake about nine miles West of Truckee, California. It is a narrow pass with a very steep approach from the east, and a gradual approach from the west.

To reach Donner Pass from the East, pioneer emigrants to California had to travel across the Nevada desert, and this route was normally avoided in favor of the Santa Fe Trail.

In the winter of 1846–1847, the Donner Party was trapped by snowstorms, and members were forced to endure such great hunger that animal hides was the only nutritional sustenance available to the party. Of the 83 people who were trapped east of the Pass, only 45 survived to reach California, and some of them resorted to cannibalism to survive. [1]

In 1913, the Lincoln Highway, the first road across America, was routed over Donner Pass.

On January 13, 1952, another group became stranded about seventeen miles west of Donner pass at Yuba Pass on Track #2 adjacent to Tunnel 35 (Track #1) at about MP 176.5. Southern Pacific's passenger train "City of San Francisco" was en route westbound through the gap when a raging blizzard slowed the train to a halt. The passengers and crew were stranded for six days until help could arrive.

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Winter weather in Donner Pass can be brutal. Precipitation averages 54 inches (137 cm), most of which falls as snow. At 415 inches (10.5 m) per year, Donner Pass is one of the snowiest places in the United States. To take advantage of the heavy snows, the Boreal Ski Resort was built to the north. Ski resorts in the Lake Tahoe area report an average of 300 to 500 inches (7.6 to 12.7 meters) of snowfall per season.[3] Winds in the pass can also become extreme and 100+ mph (160 km/h) wind gusts are common during winter storms. Winter temperatures in the area drop below zero several times each year; the all-time record low for California of -45°F was recorded at the Boca Reservoir (east of Truckee) in January 1937.

The winter of 1846-47 was especially severe, and this is generally cited as the single most important factor in the disaster of the Donner Party.

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I grew up in Susanville and Grass Valley.

scpg02 · Joined: 22 Jul 2007 Posts: 221 Location: Sacramento