Re: Milankovich Cycles

[Tompaleo@xxxxxxx]

>I have been extensively studying long-term (ca. 300 my) >Milankovitch cycles
for
>the past couple of years, looking precisely for the type of >interference
>patterns you talk about.  On my very first run, I found an >approximately
26my
>cycle! Unfortunately, it did not hold up on further analysis.
 

What effect were you studying that initially looked like a 26my cycle?


 >Nevertheless,
>there is some evidence for very long term cycles.  Certainly, there >will be
>periods when insolation is changing very rapidly compared to other >times.
 This
>should have direct impacts on the biota, especially on net primary
>productivity
>(see my abstract at the Decemeber 1994 AGU meeting).


I'll try to track this down. If not, do you have any reprints left? 


 Currently, >I planning work
>with a climate modeler to see if certain types of geographic >distributions
are
>more sensitive to Milankovitch forcing and if thresholds exit. - Roy
>Plotnick

It would seem likely that climate extremes resulting from these cycles should
be more pronounced in "sensitive" geographic areas such as the poles , ocean
deeps ect., but what to look for? Ice cores have shown that cool downs were
rather slow but warm ups (post Ice Age) seem to have been rapid. This sounds
more like a thermodynamic problem to be solved first.

                                             Tom Lipka