Paleoceanographic changes along the western Spitsbergen margin, evidence from planktic microfossil during the last 10 kyr BP

IF 2.6 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology Pub Date : 2025-04-17 DOI:10.1016/j.palaeo.2025.112940

Fiorenza Torricella , Caterina Morigi , Viviana Gamboa-Sojo , Katia Carbonara , Laura Bronzo , Renata G. Lucchi

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引用次数: 0

Abstract

Marine microfossils record oceanographic changes that are closely linked to climate variability. We use diatoms, planktic foraminifera, and calcareous nannofossils to reconstruct the paleoceanographic evolution along the western margin of Spitsbergen (Arctic) during the last 10 kyr BP. The data are compared with other records from the western margin of Spitsbergen. We recognize three distinct units corresponding to the late phase of the early Holocene, the middle Holocene, and the late Holocene.

The results indicate warm sea surface conditions along the western margin of Spitsbergen from 10 to 7.5 kyr BP, simultaneous to a maximum of summer insolation. Maximum advection of North Atlantic Water (NAW) occurs between 10 and 9 kyr BP, corresponding to the last part of the Holocene Thermal Maximum (HTM).

The microfossil association evidenced a gradual cooling of the surface water between 7.4 and 3.8 kyr BP. Surface cooling can be explained by increased water mass exchange with the Arctic Ocean and/or reduced solar insolation. From 3.8 kyr BP, we have evidence of strong seasonality, stratified surface waters, and a slight inflow of NAW. The last 2000 years are characterized by an alternation of warm and cold periods associated with a change in NAW inflow.

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斯匹次卑尔根岛西部边缘的古海洋学变化：近10kyr BP浮游微化石的证据

海洋微化石记录了与气候变异密切相关的海洋变化。我们利用硅藻、浮游有孔虫和钙质化石重建了斯匹次卑尔根（北极）西缘在公元前 10 千年的古海洋演变。这些数据与斯匹次卑尔根西缘的其他记录进行了比较。结果表明，在公元前 10 千年至公元前 7.5 千年期间，斯匹次卑尔根西缘海面温暖，同时夏季日照达到最高值。北大西洋水（NAW）的最大吸力出现在公元前 10 至 9 千年之间，与全新世热极盛期（HTM）的最后一部分相对应。微化石关联证明，在公元前 7.4 至 3.8 千年之间，表层海水逐渐冷却。表层冷却的原因是与北冰洋的水量交换增加和/或太阳日照减少。从公元前 3.8 千年起，我们有证据表明表层海水具有强烈的季节性和分层性，并有少量的北冰洋海水流入。在过去的 2000 年中，暖期和冷期交替出现，这与 NAW 流入量的变化有关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Palaeogeography, Palaeoclimatology, Palaeoecology 地学-地球科学综合

CiteScore

5.90

自引率

10.00%

发文量

398

审稿时长

3.8 months

期刊介绍： Palaeogeography, Palaeoclimatology, Palaeoecology is an international medium for the publication of high quality and multidisciplinary, original studies and comprehensive reviews in the field of palaeo-environmental geology. The journal aims at bringing together data with global implications from research in the many different disciplines involved in palaeo-environmental investigations. By cutting across the boundaries of established sciences, it provides an interdisciplinary forum where issues of general interest can be discussed.