1 / 21

PLANET EARTH: FRAGILE AND EVER-CHANGING Ashok Sahni INSA

PLANET EARTH: FRAGILE AND EVER-CHANGING Ashok Sahni INSA Senior Scientist ashok.sahni@gmail.com. Earth is 4650000000 yrs old; Life 3500000000 yrs, Industrialization 300 yrs. 121C to-167C Int. Space Stn. Thermal Regime for a Living Planet.

nyoko
Download Presentation

PLANET EARTH: FRAGILE AND EVER-CHANGING Ashok Sahni INSA

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. PLANET EARTH: FRAGILE AND EVER-CHANGING Ashok Sahni INSA Senior Scientist ashok.sahni@gmail.com Earth is 4650000000 yrs old; Life 3500000000 yrs, Industrialization 300 yrs

  2. 121C to-167C Int. Space Stn. Thermal Regime for a Living Planet VENUS MARS

  3. Fate of Earth?

  4. Present Day Species Diversity

  5. Greenhouse earth Greenhouse earth Icehouse earth-present Snowball Earth Cryogenian ca. 650 ma Icehouse earth 250 ma+

  6. 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

  7. Global Mean Annual Temperature Distributions at 0 & 100 my

  8. Long term climate change perspective ( myrs)

  9. Sun unusually active during last 50 years Monthly Sunspot no

  10. Sea level rise

  11. Atmospheric O2 & C02 and evolution of life ( greening of the earth) 20.9%PAL O2 CO2 6-8% PAL

  12. 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

  13. Climate change: ocean current gyre

  14. Primrose: Decoration for man: landing pad for an insect!! Adjusted for UV light as seen by insects Dawkins: Greatest Show on Earth: 2009

  15. ICEBERGS WILL MELT! BUT… IF YOU WANT TO LIVE IN HARMONY WITH THE EARTH, TRY TO UNDERSTAND IT. NO NEED TO PANIC!!

More Related