南極の氷から推定された気温と塵の量の関係
The other day, there was a small news in Japan. The news was saying the number of days Mt. Fuji was visible(observable) from a university was increasing.http://www.seikei.ac.jp/obs/pwork/fuji_j.htm
http://www.seikei.ac.jp/obs/pwork/image/visible.gif
This was surprising to me since seeing Mt.Fuji was a kind of a luckey event when I was a child.
At the same time, it reminded that the temperature in Japan had been getting higher and higher, year by year. "Could dust have any relation to the higher temperature, here ?" I know TV and news papers were reporting about the global warming, which is one of our concerns, though I'm not sure what really is causing it. Today, I just googled temperature and dust and I visited a site http://www.climatedata.info . I found 2 impressive pictures.
The first one is a picture that shows the relationship between estimated temperature and CO2 concentration.
http://www.climatedata.info/Proxy/Proxy/icecores_files/BIGw03-epica-temperature-and-co2.gif.gif
The other is a picture that shows the relationship between estimated temperature and airborne dust.
http://www.climatedata.info/Impacts/Impacts/dust_files/BIGdust_-_epica.gif.gif
Yap, it shed a light in my mind. This type of graph is ...
I downloaded the data for airborne dust from the site and made a new graph. Next picture shows a relationship between estimated temperature and the inverse of airborne dust, actually 50/(amount of dust), for 800 thousands years. Pink line is the calculated inversed airborne dust and dark blue is the estimated raw temperature.
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| Temperature (Blue) v.s. Inverse of Dust (Pink) ( 気温 v.s. 塵の量の逆数 ) |
It's interesting, isn't it ?
Yes, but still could be improved. I tried manual fitting using the Excel's log function. Here is the result.
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| Temperature v.s. Log inverse of Dust 気温 v.s. 塵の量の逆数の対数 |
The relationship between temperature and airborne dust can be written as
\[ Temperature \sim \log\left( \frac{14}{Dust} \right)^5 \]
It's really unbelievable to me.
How can the inverse of airborne dust fit to the temperature ? What can cause the dust behave like this ?
CO2 ?
That would be much more unbelievable to me.
*Notes after the writes
I noticed this site's analysis is earlier and better.http://judithcurry.com/2011/12/21/a-biologists-perspective-on-ice-ages-and-climate-sensitivity-part-i/
Furthermore, Nature letter had been published on 3 April 2008 (Vol 452) with other fitting formulas,
"Dust-climate couplings over the past 800,000 years from the EPICA Dome C ice core"
doi:10.1038/nature06763
I found another interesting chart.
Red: temperature
dark blue: CO2
light blue: methane
