Stable isotope ratios of foraminifera from the continental shelf off Troms, Northern Norway

A stable oxygen and carbon isotope stratigraphy is established for a Late Weichselian/Holocene glaciomarine/marine seguence in Andfjorden and Malangsdjupet on the continental shelf off Troms, Northern Norway. The stratigraphy demonstrates that the global signals, Termination I B and possibly also I A (upper parts), are present and radiocarbon date to 10.3-9.7 kyr B.P. and >14-13.5 kyr B.P., respectively. A temperature increase of 5°-6°C and possibly a small salinity increase occurred during Term. I. A near-glacial environment between 13 and 14 kyr B.P. was characterized by poorly ventilated bottom waters followed by a meltwater pulse at circa 13 kyr B.P. During the beginning intrusion of Atlantic Water between 13 and 10 kyr B.P., the bottom water was characterized by somewhat fluctuating temperatures and salinities. Temperatures close to those of the present were established around 9.7 kyr B.P. and seem to have been rather stable since.

针对挪威北部特罗姆瑟外大陆架安菲约登（Andfjorden）与马朗斯尤佩特（Malangsdjupet）海域的晚魏克塞尔期（Late Weichselian）/全新世（Holocene）冰海相/海相序列，本研究建立了稳定氧碳同位素地层学（stable oxygen and carbon isotope stratigraphy）记录。该地层记录显示，全球标志性终止事件（Termination）I B以及可能的I A（上部层位）均有体现，其放射性碳定年结果分别为10.3~9.7千年BP（kyr B.P.）与>14~13.5千年BP。终止事件I期间，区域海水升温5℃~6℃，同时可能伴随小幅盐度升高。在13~14千年BP时段，区域处于近冰期环境，底层水体通风性较差，随后约13千年BP出现一次融水脉冲（meltwater pulse）。在13~10千年BP大西洋水（Atlantic Water）首次侵入阶段，底层水体的温度与盐度存在一定波动。约9.7千年BP时，水温达到接近现代的水平，且此后整体保持相对稳定。