Holocene sea subsurface and surface water masses in the Fram Strait – Comparisons of temperature and sea-ice reconstructions

摘要: Highlights • Holocene sea subsurface temperatures after Husum & Hald (2012) estimated from planktic foraminifer fauna in E Fram Strait. • Biomarkers and IP25-derived indices (including DIP25) indicate surface water variability. • Delayed onset of early conditions (∼10.6 ka) compared to (∼11.7 conditions. • Warm Atlantic layer likely occupied uppermost 200 m eastern Strait between 10 9 ka. • Diverging late trends linked presence strong pycnocline/stratification. Abstract Two high-resolution sediment cores have been investigated for temperature variability during the (the past ca 12,000 years). The transfer function developed by has applied order reconstruct fluctuations throughout period. Additional biomarker foraminiferal proxy data are used elucidate mass conditions, conclude on climate oceanographic West Spitsbergen continental margin. Results consistently reveal warm up 6 °C until 5 cal ka BP, with maximum seawater around related July insolation occurring at that time. Maximum Water (AW) advection occurred 10.6 8.5 BP based both dinocyst reconstructions. Probably, a less-stratified, ice-free, nutrient-rich ocean AW prevailed BP. Weakened contribution is found when strongly decrease minimum values 4 3 Cold furthermore supported high shell fragmentation δ18O subpolar species Turborotalita quinqueloba. While IP25-associated as well suggest sustained cooling due summer consequently sea-ice increase since about 7 waters, including stable isotopes slight return stronger influx observed decoupling waters later most attributed pycnocline separating cold fed enhanced advection. This may be changes North versus subtropical gyre activity.