Paleoceanography of the Gulf of Tehuantepec during the Medieval Warm Period

The present study is focused on sediment core MD02–2521 in the Gulf of Tehuantepec (GT). This area, situated within Oxygen Minimum Zone (OMZ), rich marine resources due to seasonal upwelling caused by Tehuanos winds and a shallower thermocline representing an important economic sector region; however, has been focus little number studies. Benthic foraminifera (BF) are target proxy reconstruct bottom‑oxygen variability during Medieval Warm Period (MWP), showing that this area was affected cyclic dissolved oxygen (DO) 3 phases: higher, poorer, oxygen-depleted shifting every ~90 years. periods result foraminiferal test dissolution, implying inevitable gaps information. MWP broadly identified as warm anomaly most parts globe even compared with current climate change serve analogous predict future consequences. Opposing global warming stands, Eastern Tropical North Pacific (ETNP) seems have experienced cooling trend. provides another proof MWP, besides it not period everywhere, also homogeneous, so quasi-centennial cycles may likely respond solar activity dynamic interaction between decadal-to centennial phenomena such El Niño Southern Oscillation (ENSO), Decadal (PDO), migration Intertropical Convergence (ITCZ). • Bottom-water reconstruction Period. reveal 90-yr bottom-oxygen fluctuations. ITCZ, PDO, ENSO, modulated irradiance, main climatic drivers.