Ocean's likely roles in determining the change of dominant period of Pleistocene glacial cycles?

Hönisch, B. et al.(Science 2009) mentioned that the dominant period of Pleistocene glacial cycles changed during the mid-Pleistocene from 40,000 years to 100,000 years, for as yet unknown reasons.Their reconstruction of the sea surface pCO2 shows a close relationship between atmospheric CO2 concentration and global climate but the drawdown of atmospheric CO2 was not the main cause of the climate transition.

Could the ocean circulation play some roles in this process? The bathymetry changed? The tidal strength changed due to the orbit variation? If so, could the ocean mixing change? Since the ocean mixing is supposed to play essential roles in determining the overturning circulation, ocean mixing pattern changed could then result in overturning circulation change, which would induce variation of heat transport? Finally ~

Whether the latitudinal dependence of ocean mixing is true or not

Gregg M (2003) proposed a possible relationship between the latitude and the ocean mixing based on microstructure data. However, the data sets he used seems cannot tell the visual relationship between them are real, since the high diffusive region appearing in the mid-latitude are associated with rough topography and the low diffusive region in the low-latitude appear with smooth topography. The decreasing mixing toward low-latitude is thus due to either the changing latitude or the changing topography. More data set are needed to examine the possible relationship.

How to automatically generate file header using Emacs

When we use emacs to write text files, file headers containing specific information, such as the author, the date of creation, the data of update, can be generated automatically. The following are steps to make it work.

1. Download the file header2.el. from http://www.emacswiki.org/emacs/header2.el
2. Add the following to your .emacs file, which you can find in the $home directory. (add-to-list 'load-path' "here is the directory where you store the header2.el")
3. Then put the following to your .emacs file:
4. (add-hook 'write-file-hooks 'auto-update-file-header)
5. (add-hook 'emacs-lisp-mode-hook 'auto-make-header)
6. (add-hook 'c-mode-common-hook 'auto-make-header)

         (add-hook 'tex-mode-hook 'auto-make-header)
4. To make the header personal, you can change the header2.el by comment or uncomment different variables.