Antarctic Climate Evolution
Posted by heartland chris on September 09, 2009 at 14:43:21:

I'm in Granada Spain for a somewhat specialized meeting on Antarctic Climate Evolution. I'll be flying straight from here on Sunday to Palm Springs to attend the Southern California Earthquake Center (SCEC) annual meeting. I worked with a couple of Mizzou students, even though I work out of UCSB, and we will be presenting:
1: The Palos Verdes fault links to the San Diego Trough fault and so is over 220 km-long rather than 100 km. (Alward and others)
2: The Carlsbad fault, previously called the Carslbad thrust, has a significant right lateral component of slip. The Oceanside thrust, which is in the SCEC Community fault model, coincides at either end with our Carlsbad fault and in between it is not a thrust and has not been a significant fault for a couple of million years (Campbell and others; Sorlien and others).

In Granada, a couple of people I worked with before (but not on this) restored the topography of a large part of West Antarctica to what it was 34 million years ago when the ice volume first became larger than that of today. Today, if you melted the ice and let it rebound, it would still be mostly underwater plus a few islands. It is hard for Global Climate Models to grow an ice sheet on such a marine area. But, Wilson and Luyendyk just published (in Geophysical Rsearch Letters this week) that it was much higher and mostly non-marine, and so Antarctica could support a larger ice sheet than it has today. (Isotopic records from ocean drilling can be modeled to estimate past ice volumes).

There was a talk stating that CO2 levels dropping were much more important in getting the ice sheets growing than moving continents around.

I'm so jet lagged I could not sleep well at night and can't stay awake in the talks.

We had a workshop today about a project I am involved in to drill from the moving Ross Ice shelf to recover a climate record. Some satellite images were shown of the ice shelf that had 0.5 m resolution. You could see the tracks of the vehicles in the snow. The USA is building an ice road to the south pole and the access to the drilling site will split off from that. They have already done radar from a plane to see how solid the ice shelf is.

I'm told I have to see the Alhambra. Our conference dinner is nearby.

OK, this is already a long post.
Chris


Follow Ups:
     ● Re: Antarctic Climate Evolution - PennyB  11:44:17 - 9/10/2009  (75884)  (1)
        ● Re: Antarctic Climate Evolution - heartland chris  11:46:55 - 9/12/2009  (75891)  (0)