Sachs, Julian P. , Sachse, Dirk , Smittenberg, Rienk H. , Zhang, Zhaohui , Battisti, David S. , Golubic, Stjepko

Sachs, J. P., Sachse, D., Smittenberg, R. H., Zhang, Z., Battisti, D. S. and Golubic, S.: Southward movement of the Pacific intertropical convergence zone AD 1400–1850, Nature Geoscience, 2(7), 519–525, doi:10.1038/ngeo554, 2009.

Southward movement of the Pacific intertropical convergence zone AD 1400?1850

Semi-preparative HPLC-MS to isolate dinosterol, which was then acetylated and injected on a GC, Delta V IRMS system

dD values of lake surface water are controlled by the amount of rainfall, its isotopic composition and the amount of mixing with the underlying seawater. As rain also increases the density stratification in the lakes, decreasing mixing, surface water dD values are expected to be significantly lower during wet periods compared with dry periods. Conclusions of the paper are about moisture balance (P-E) in the tropical Pacific.

Permanent anoxia in the subsurface water confines phytoplankton, dominated by dinoflagellates and diatoms24, to the oxygenated, brackish and deuterium-depleted surface water where their lipid ?D values can be expected to closely co-vary with the surface water ?Dvalues25,26. ?D values of that water are controlled by the amount of rainfall, its isotopic composition and the amount of mixing with the underlying sea water. As rain also increases the density stratification in the lakes, decreasing mixing, surface water ?D values are expected to be significantly lower during wet periods compared with dry periods.  Zhang and Sachs 2007, Organic Geochemistry, 38: 582-608.

depends on source, transport history, etc

Permanent anoxia in the subsurface water confines phytoplankton, dominated by dinoflagellates and diatoms24, to the oxygenated, brackish and deuterium-depleted surface water where their lipid dD values can be expected to closely co-vary with the surface water dDvalues25,26. dD values of that water are controlled by the amount of rainfall, its isotopic composition and the amount of mixing with the underlying sea water. As rain also increases the density stratification in the lakes, decreasing mixing, surface water dD values are expected to be significantly lower during wet periods compared with dry periods.  Zhang and Sachs 2007, Organic Geochemistry, 38: 582-608.