Global Warming News

Report: Global Warming Issue From 2 Or 3 Years Ago May Still Be Problem

WASHINGTON—According to a report released this week by the Center for Global Development, climate change, the popular mid-2000s issue that raised awareness of the fact that the earth's continuous rise in temperature will have catastrophic ecological effects, has apparently not been resolved, and may still be a problem.

Source and for detali story: http://www.theonion.com/articles/report-global-warming-issue-from-2-or-3-years-ago,18431/?utm_source=recentnews



NOVEMBER 10, 2010 | ISSUE 46•45

Hydrological Cycle (Feedback)

                First Phase

1.      As Surface temperature increase its increase the evaporation (+ve feedback)

2.      As evaporation increase its decrease the surface temperature (-ve feedback)

3.      As evaporation increase, water vapour in the atmosphere also increase ( +ve feedback)

4.      With increase in water vapour in atmosphere, surface temperature also increase. (+ve feedback)

Second Phase

5.      Water vapour increase, relative humidity also increase (+ve feedback)

6.      Relative humidity lead to increase cloud cover (+ve feedback)

7.      But due to condensation increase in cloud cover reduce water content in the atmosphere (-ve feedback)

8.      Surface temperature decrease with increase in relative humidity (-ve feedback)

Third Phase

9.      Greater cloud cover mean low radiation (-ve feedback)

10.  Also greater cloud cover leads to low incoming solar radiation (-ve feedback)

11.  High radiation means high surface temperature(+ve feedback)

12.  But high outgoing radiation reduce surface temperature (-ve feedback)

13.  On the other hand high incoming radiation increase surface temperature (+ve feedback)

                                                                                                                                                                Source: Guy Schurger lecture

Environmental change impacts on major biomes

1)      Amazon tropical rainforest

+2.5 degrees C

Increase Total NPP 0.149

Decrease Tropical broadleaved evergreen -0.087

Decrease Tropical broadleaved raingreen 0.062

Decrease Warm grass    -0.168

Precipitation -10%

No changes at all

CO2x2 (Double)

Increase Total NPP 0.449

Increase Tropical broadleaved evergreen 0.255

Increase Tropical broadleaved raingreen 0.193

No changes Warm grass               

Combined

Increase Total NPP 0.309

Increase Tropical broadleaved evergreen 0.165

Increase Tropical broadleaved raingreen 0.144

Slight increase Warm grass 0.002

Environmental change impacts on major biomes

1)      Southern Sweden temperate forest

+4 degrees C

decrease in total NPP (0.551 -0.46=0.091kgC/m2yr)

Temperate needleleved evergreen (0.326-0.247=0.079)

Temperate broadleafed summergreen (0.182-0.166=0.016)

Cool grass (0.043-0.047=-0.004)

→ all PFTs decreasing

Precipitation +10%

decrease in total NPP (0.551 -0.575=-0.024kgC/m2yr)

Temperate needleleved evergreen (0.326-0.336=-0.01)

Temperate broadleafed summergreen (0.182-0.194=-0.012)

Cool grass (0.043-0.045=-0.002)

→ almost no changes

CO2x2 (Double)

decrease in total NPP (0.551 -0.746=-0.195kgC/m2yr)

Temperate needleleved evergreen (0.326-0.267=0.059)

Temperate broadleafed summergreen (0.182-0.267=-0.085)

Cool grass (0.043-0.056=-0.013)

→ all PFTs increasing

Combined

increase in total NPP (0.551 -0.71=-0.159kgC/m2yr)

Temperate needleleved evergreen (0.326-0.378=-0.052)

Temperate broadleafed summergreen (0.182-0.272=-0.079)

Cool grass (0.043-0.06=-0.017)

→ all PFTs increasing