climates, past and present - upati.gov.inupati.gov.in/mediagallery/clim change lko 150210.pdf ·...
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Thermal Regime for a Living Planet
Fate of Earth?
Evolution and O2 PAL
Sea level rise
Sun unusually active during last 50 years
Monthly
Sunspot no
Long term climate change
perspective ( myrs)
Disasters: Common, happening or yet to happen! FREQUENCIES: ANNUAL TO KILO YEARS-SURFACE AND INTERNAL
(PLANETARY) STRESSES:-
droughts, floods, landslides, earthquakes/tsunamis, volcanic eruptions (within record of human civilization)
FREQUENCIES: KILO YEARS OR MORE-SOLAR OR COSMIC FORCING:-
Climate Change-Solar radiations and water budget CO2/O2 /O3 enhancement and depletion. Cometary Impacts: ( note Tunguska 1908, Lonar, India
(10kyr), Shoemaker –Levy on Jupiter 1994. Anoxia-relatively sudden decrease in atmospheric O2
Ecosystem collapse-corals, tropical rainforests, large mammal niche etc
Greenhouse Earth and CO2 PAL
65
245
Icehouse /Greenhouse, sea level Fluctuations through time
65
245
443
0
Glacial features in India, + 250 ma: Orissa, Jharkhand,
Rajasthan
Glacial erratic, Talchir Glaciation, Daltonganj Basin, +250 ma
Dropstone in glacial varvites, Gursuti Nala, Daltonganj Basin
ICE COVERED INDIA 280 MA
Greenhouse Earth and CO2 PAL
Biodiversity Through Time-several extinction events
Present Day Species Diversity
Climate change: ocean current gyre
Emiliania huxleyi
Cyclic Solar Energy input drives Earth’s Climate and Weather. Greenhouse Gases .
Phyto (nanno)plankton are a powerful Biologic Pump to drastically reduce Greenhouse Gas CO2
NASA’s Sea-viewing Wide Field-of-view Sensor (SeaWiFS) can accurately measure Climate Change reflected by Phytoplankton
VOLCANIC EVENTS COINCIDE WITH MASS EXTINCTIONS
Volcanic Activity and Extinctions
Montreal Protocol
Primrose: Decoration for man: landing pad for an insect!!
Adjusted for UV light as seen by insects
Dawkins: Greatest Show on Earth: 2009
ICEBERGS WILL
MELT!
BUT…
DON’T PANIC!!