Deglacial development of (sub) sea surface temperature and salinity in the subarctic northwest Pacific: Implications for upper-ocean stratification
| Type | Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Date | 2013 | ||||||||
| Language | English | ||||||||
| Author(s) | Riethdorf Jan-Rainer1, 3, Max Lars2, Nuernberg Dirk1, Lembke-Jene Lester2, Tiedemann Ralf2 | ||||||||
| Affiliation(s) | 1 : Helmholtz Centre for Ocean Research Kiel (GEOMAR), Kiel, Germany 2 : Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany 3 : Department of Ocean Floor Geoscience, Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, Chiba, Japan. |
||||||||
| Source | Paleoceanography (0883-8305) (American Geophysical Union), 2013 , Vol. 28 , N. 1 , P. 91-104 | ||||||||
| DOI | 10.1002/palo.20014 | ||||||||
| WOS© Times Cited | 45 | ||||||||
| Abstract | Based on models and proxy data, it has been proposed that salinity-driven stratification weakened in the subarctic North Pacific during the last deglaciation, which potentially contributed to the deglacial rise in atmospheric carbon dioxide. We present high-resolution subsurface temperature (T-Mg/Ca) and subsurface salinity-approximating (delta O-18(ivc-sw)) records across the last 20,000 years from the subarctic North Pacific and its marginal seas, derived from combined stable oxygen isotopes and Mg/Ca ratios of the planktonic foraminiferal species Neogloboquadrina pachyderma (sin.). Our results indicate regionally differing changes of subsurface conditions. During the Heinrich Stadial 1 and the Younger Dryas cold phases, our sites were subject to reduced thermal stratification, brine rejection due to sea-ice formation, and increased advection of low-salinity water from the Alaskan Stream. In contrast, the Bolling-Allerod warm phase was characterized by strengthened thermal stratification, stronger sea-ice melting, and influence of surface waters that were less diluted by the Alaskan Stream. From direct comparison with alkenone-based sea surface temperature estimates (SSTUk'37), we suggest deglacial thermocline changes that were closely related to changes in seasonal contrasts and stratification of the mixed layer. The modern upper-ocean conditions seem to have developed only since the early Holocene. | ||||||||
| Full Text |
|