AI Article Synopsis
- The late Miocene-early Pliocene period saw an increase in ocean productivity due to more nutrients available, potentially related to ocean gateways or monsoon changes.
- The exact reasons for this increase and its eventual decline are still debated among scientists.
- A comprehensive analysis shows that ocean productivity in low-latitude areas sharply dropped around 4.6-4.4 million years ago, correlating with lower orbital eccentricity and changes in the East Asian Monsoon, which reduced nutrient supply from rivers.
Article Abstract
The late Miocene-early Pliocene biogenic bloom was an extended time interval characterised by elevated ocean export productivity at numerous locations. As primary productivity is nutrient-limited at low-to-mid latitudes, this bloom has been attributed to an increase or a redistribution of available nutrients, potentially involving ocean-gateway or monsoon-related mechanisms. While the exact causal feedbacks remain debated, there is even less consensus on what caused the end of the biogenic bloom. Here, we compile Mio-Pliocene paleoproductivity proxy data from all major ocean basins to evaluate the timing and pacing of this termination. This systematic analysis reveals an abrupt and sustained reduction in low-latitude ocean productivity at 4.6-4.4 Ma. The decline in productivity coincided with a prolonged period of low orbital eccentricity and a shift towards lower-amplitude obliquity, an astronomical configuration linked to reduced East Asian Monsoon intensity and decreased riverine nutrient supply.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8764042 | PMC |
| http://dx.doi.org/10.1038/s41467-021-27784-6 | DOI Listing |
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