Earth Science

In: Science

Submitted By connor7002
Words 377
Pages 2
Earth Science Jan 26, 2016
Summary – 3#

* Recognize many events: * Ice houses * Hot houses * Mass extinctions? * Largest – end Permian – 252 Ma * Famous – K/T – 65 Ma * Largest Icehouse – Marinoan – 650 Ma

K/T Event * Three theories * Missed boat * Sink the other boat * Bolide impact * Extraterrestrial signatures * Iridium anomaly * Shock quartz
End Permian * Best archives * Brachiopods * Conodonts * Largest mass extinction * 90% of marine species * 70% of terrestrial species * Gradual * Sudden * Step-wise * Causes: extraterrestrial – terrestrial * Leading: anoxia and global warming * Major trigger – Serbian flood basalts * 1 – 2 Km thick * 6 million km3 (volume) * Transition in rocks full of diverse life to devoid (world-wide) * No Ir, No SQ

Screening of archival material: * Visual inspection * Petrography * SEM (scanning electron microscopy) * CL (cathodoluminescence) * TE (trace elements) * SI (isotopes – carbon, oxygeb, strontium)

* Sudden Event (geologic)

* Onset: 1000 – 2000 years

* Duration: -60000 years

* Global warming: tropical seas >40 degrees

Global change in seawater temperature – 1 degree (0.67/100 years) IPCC * -ALBEDO * Ice melting feedback * Peramfrost feedback
Modern data collection: satellite (1985) Ground measurements (ice breakup, 1970)

-Arctic: polar amplification
-Warming: IPCC -> 2-3 x
- Actual: -> 6x (Arctic and Antarctic)

Instead of freezing -> flow year round

Problems:
-Earlier freeze up in the fall
-closing of polynyas

LECTURE #4 – SOLAR RADIATION AND GREENHOUSE GASES

* Sun: is a huge nuclear reactor * Disperses enormous energy (5727 C) (electromagnetic…...

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