Abstract The mid‐to‐late Miocene is proposed as a key interval in the transition of Earth's climate state toward that modern‐day. However, it remains poorly understood evolution Cenozoic climate, and sparse proxy‐based reconstructions are associated with large uncertainties. In particular, tropical sea surface temperature (SST) estimates largely rely on unsaturated alkenone U k 37 proxy, which ...

Laboratory experiments conducted on the multichambered planktic foraminifera Globigerinoides sacculifer are used to determine the effect of symbiont photosynthesis on shell carbon and oxygen isotopic composition. Stable isotope analyses of individual chambers secreted under controlled temperature and light levels show that chamber jl3C values increase with increasing light levels. The effect of...

Planktic foraminfera and shelled pteropods are important calcifying groups of zooplankton in all oceans. Their calcium carbonate shells sensitive to changes ocean chemistry predisposing them as an indicator acidification. Moreover, planktic contribute significantly food webs vertical flux polar pelagic ecosystems. Here we provide, for the first time, information on under-ice foraminifera pterop...

Foraminiferal assemblages were studied as part of a multi-proxy dataset from an expanded record Late Turonian hemipelagic deposition obtained the Bch-1 research borehole in Bohemian Cretaceous Basin (Central Europe). Based on fluctuations Si/Al ratio, precession-paced cyclicity (18–23 kyr) is recognized interval and interpreted to reflect changes seasonality. This study focuses relationships be...