1 / 14

Section 3 Remote sensing of global change

Section 3 Remote sensing of global change. Ozone hole Global Change Instructor: Dr. Cheng-Chien Liu Department of Earth Sciences National Cheng Kung University Office: Building of Earth Sciences, room 30206 Voice: +886-6-2757575 ext. 65422 E-mail: ccliu88@mail.ncku.edu.tw

gage-hall
Download Presentation

Section 3 Remote sensing of global change

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. Section 3 Remote sensing of global change Ozone hole Global Change Instructor: Dr. Cheng-Chien Liu Department of Earth Sciences National Cheng Kung University Office: Building of Earth Sciences, room 30206 Voice: +886-6-2757575 ext. 65422 E-mail: ccliu88@mail.ncku.edu.tw Office hours: Monday 14:00 – 17:00, Wednesday 9:00 – 12:00 URL: http://mail.ncku.edu.tw./~ccliu88/ Last updated: 22 April 2005

  2. Compositions of atmosphere • Constituents • N2 • O2 • Ar • CO2, H2O, Methane, O3, SO2, CFC, … • Distribution and structure • Temperature • Ozone

  3. Fig. 1 Fig. 1 Vertical structure of ozone concentration and temperature in the atmosphere. Source: http://140.115.123.30/gis/globalc/fig/05-01.gif

  4. Ozone • Origin • O2+ hυ→O + O • O+ O2+ M → O3 + M • Unit • Dobson unit ( DU ) • 1 DU = 10-5m @1atm • Average O3 300 DU = 0.3 cm @1atm

  5. Ozone (cont.) • Merits • ozone  absorb UV radiation • http://svs.gsfc.nasa.gov/vis/a000000/a001600/a001603/moleculeC.mov • Destruction • CFC destruction  Ozone destruction • http://svs.gsfc.nasa.gov/vis/a000000/a001600/a001603/moleculeA.mov • http://svs.gsfc.nasa.gov/vis/a000000/a001600/a001603/moleculeB.mov

  6. Ozone (cont.) • Consequences of losing ozone • Different absorption of UV-A, UV-B, UV-C • UV-C • UV-B  • Skin cancer, immune system, reptile eggs, photosynthesis, production, phytoplankton • UV-A • Biology > Climate

  7. Fig. 2.2.1 Fig. 2 The height to the ground that the solar radiation ranged from 140 to 340 nm can penetrate in the atmosphere.Source: http://140.115.123.30/gis/globalc/fig/05-10.gif

  8. Remote sensing techniques for studying ozone hole • Total Ozone Mapping Spectrometer • http://toms.gsfc.nasa.gov/

  9. Remote sensing techniques for studying ozone hole (cont.) • Mission • Nimbus-7 (1978/10 – 1993/5) • Meteor-3 (1991/8 – 1994/11) • A short video of the Meteor-3 launch from the Plesetsk facility in Russiahttp://toms.gsfc.nasa.gov/m3toms/images/m3launch2.mpg • ADEOS(1996/7 – 1997/6) • Earth Probe (1996/7 – present)

  10. Remote sensing techniques for studying ozone hole (cont.) • Principle • http://code916.gsfc.nasa.gov/Public/Space_based/sbuv/oz_meas.html • 12 bands from 255 nm to 340 nm • Penetrate to the ground  total column ozone • 312.5 nm, 317.5 nm, 331.2 nm and 339.8 nm • Take two band ratio (weakly and strongly absorbed) • Not penetrate to the ground  ozone vertical profile • 255 – 306 nm • l penetration  • Wavelengths scan  attitude scan

  11. Remote sensing techniques for studying ozone hole (cont.) • Measurements • The evolution of the ozone hole over Antarctica (1979 – 1999) made by Nimbus-7 + Meteor-3 and Earth Probe • http://svs.gsfc.nasa.gov/vis/a000000/a000700/a000710/a000710.mpg • Ozone in the northern and southern hemispheres as measured by Earth Probe TOMS from 7/26/1996 to 11/4/2001 • http://svs.gsfc.nasa.gov/vis/a000000/a002200/a002284/a002284.mpg

  12. Fig 3 Fig. 3 Earth Probe TOMS Total Ozone September 16, 2000Source: http://toms.gsfc.nasa.gov/multi/recent_ozone91200.gif

  13. Fig 4 Fig. 4 Ozone hole size. Source: http://www.gsfc.nasa.gov/gsfc/earth/pictures/20020926ozonehole/avg_size_o3hole79-01_bw.jpghttp://edc.usgs.gov/products/satellite/avhrr.html

  14. Questions • Why the ozone hole is only found in Antarctica?

More Related