Biosedimentary systems in Arctic environments: Polar coralline algae

2006年，在EPS Maria S.梅里安克鲁斯2/3。这一地点和斯瓦尔巴特群岛周围的其他几个地点都用载人潜水艇Jago进行了密集的记录和取样。极地珊瑚藻在极地沃茨中的分布似乎比以前认为的要广泛得多，因此代表了一种独特的极地碳酸盐工厂。该建议旨在（1）分析这些鲜为人知的生物沉积系统的生物组合和功能，（2）证明珊瑚藻在重建历史环境变化（例如，北极正在变暖，这是真的吗？）利用测年和地球化学方法，和（3）估计预算的光极性碳酸盐。斯瓦尔巴底群岛的珊瑚藻地将与挪威北方的珊瑚藻地进行比较，后者再往南约1000公里，但仍在极圈之外。这种比较有助于阐明向极地增加的盐度对钙化生物的影响。从这两个地区（挪威和斯瓦尔巴特群岛）中全新世的红长石是可用的，并允许分析古气候研究，如全新世气候最佳的幅度与目前的情况在极地地区。

In 2006, the northernmost coralline algal grounds were discovered at 80°30 N off Nordaustlandet during EPS Maria S. Merian Cruise 2/3. This site and several others around Svalbard were intensively documented and sampled with the manned submarine Jago. Polar coralline algae seem to be much more widespread in polar waters than previously thought, thus representing a unique polar carbonate factory. This proposal intends to (1) analyse the biotic assemblage and functioning of these poorly known biosedimentary system, (2) to testify the value of coralline algae to reconstruct historic environmental change (e.g., the ongoing Arctic wanning, is it true?) using dating and geochemical methods, and (3) to estimate a budget for photic polar carbonates. The Svalbardian coralline algal grounds will be compared with those from northern Norway, some 1000 km further south but still beyond the Polar Circle. This comparison helps to elucidate the influence of poleward increasing saisonality on calcifying organisms. From both areas (Norway and Svalbard) mid-Holocene rhodoliths are available and allows the analysis of palaeoclimatic studies, such as the amplitude of the Holocene climatic optimum with the present situation in a polar region.