Physical mechanisms behind biogeochemical glacial-interglacial COe variations

The importance of precessional signals in the tropical climate

Past research on the climate response to orbital forcing has emphasized the glacial-interglacial variations in global ice volume, global-mean temperature, and the global hydrologic cycle. This emphasis may be inappropriate in the tropics, where the response to precessional forcing is likely to be somewhat independent of the glacial-interglacial variations, particularly in variables relating to ...

Sea ice switch mechanism and glacial-interglacial CO2 variations

[1] A physical mechanism is proposed for the glacial-interglacial variations in the rate of vertical mixing and in sea ice cover in the Southern Ocean. Such variations were postulated without an explanation by Toggweiler [1999] and Stephens and Keeling [2000], who used them to explain the glacial-interglacial CO2 variations. In the physical mechanism explored here, initially given by Gildor and...

Interactive comment on “Glacial-interglacial variability in ocean oxygen and phosphorus in a global biogeochemical model” by V. Palastanga et al

Interactive comment on “Glacial-interglacial variability in ocean oxygen and phosphorus in a global biogeochemical model” by V. Palastanga et al

Interactive comment on “Glacial-interglacial variability in ocean oxygen and phosphorus in a global biogeochemical model” by V. Palastanga et al

To test this hypothesis we present a series of experiments with an ocean biogeochemical model of the glacial ocean with and without inclusion of these particulate fluxes. Our work builds on previous box modeling studies by Tsandev et al. (2010) and Filippelli et al. (2007) for the glacial ocean and our own work on carbon (C), oxygen and phosphorus cycling in the present-day (pre-industrial) oce...