Oxygen limited marine environments, such as oxygen minimum zones, are of profound importance for global nutrient cycling and vertical habitat availability. While it is understood that the extent intensity zones responsive to climate, suite viable proxies low pelagic environments continues pose a real barrier paleoclimate interpretations. Here we investigate proxy potential an array trace elemen...

[1] It is widely recognized that a significant negative excursion in carbon isotopic (dC) differences between planktic and benthic foraminiferal tests occurred at the Cretaceous-Tertiary (K-T) boundary. We applied parametric and nonparametric breakpoint tests and statistical comparisons of different recovery models to assess the timing and pattern of recovery from this negative excursion at Sou...

Over the last deglaciation there were two transient intervals of pronounced atmospheric CO2 rise; Heinrich Stadial 1 (17.5-15 kyr) and Younger Dryas (12.9-11.5 kyr). Leading hypotheses accounting for increased accumulation in atmosphere at these times invoke deep ocean carbon being released from Southern Ocean an associated decline global efficiency biological pump. Here we present new deglacia...

[1] Fossil foraminifera are critical to paleoceanographic reconstructions including estimates of past episodes of methane venting. These reconstructions rely on benthic foraminifera incorporating and retaining unaltered the ambient isotopic compositions of pore fluids and bottom waters. Comparisons are made here of isotopic compositions of abundant live and fossil foraminifera (Uvigerina peregr...

Stationarity of species’ ecological tolerances is a first-order assumption paleoenvironmental reconstruction based upon analog methods. To test this and other assumptions used in quantitative analysis foraminiferal faunas for paleoceanographic reconstruction, we analyzed paired alkenone unsaturation ratio (U37K′) sea surface temperature (SST) estimates relative abundances planktic foraminifera ...

After the Chicxulub impact and mass extinction at Cretaceous-Paleogene boundary (K-PgB), ecosystems haltingly recovered under unstable conditions. An early Danian (65.9 Ma) perturbation of carbon cycle known as Dan-C2, which includes two isotopic excursions (CIEs), has been ascribed to inputs greenhouse gases through large-scale volcanism Deccan Traps. However, relationship between environmenta...