Ocean freshening near the end of the Mesozoic.

ABSTRACT: Paleogeographic changes have significantly shaped ocean circulation and climate dynamics throughout Earth's history. This study integrates geological proxies with climate simulations to assess how ocean gateway evolution influenced ocean salinity near the end of the Mesozoic (~66 Ma). Our modeling results demonstrate that 1) Central American Seaway shoaling reorganizes ocean currents, and 2) Arctic marine gateway restrictions, confining Arctic-Global Ocean exchange exclusively to the Greenland-Norwegian Seaway, drive Arctic Ocean surface freshening and southward outflow of buoyant, low-salinity waters. However, only the combined effect of these two factors leads to both Arctic freshening and increased water mass stratification in the Greenland-Norwegian Seaway, proto-North Atlantic, and th

SUBMITTER: Radmacher W 

PROVIDER: S-EPMC12328591 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature