Marine ecosystem response to late Pleistocene climate conditions- evidence from snow petrel stomach oil deposits ("mumiyo") in East Antarctica

海洋生态系统对更新世晚期气候条件的响应——来自东南极洲雪海燕胃油沉积物（“mumiyo”）的证据

• 批准号: 424214250
• 负责人: Dr. Sonja Berg
• 金额: --
• 依托单位: Institut für Geologie und Mineralogie
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/424214250?language=en
• 关键词: Marine; ecosystem; response; late; Pleistocene

During the Last Glacial Maximum (LGM) expanded ice shelves and sea ice around the Antarctic continent affected global thermohaline circulation as well as endemic Antarctic biota. Under these glacial conditions coastal polynyas have been identified as important sites of Antarctic Bottom Water formation and as glacial refuges for marine biota. Knowledge about the existence of such polynyas off Dronning Maud Land (East Antarctica) comes from the in-land breeding sites of snow petrels. Records of past snow petrel colonies are stomach oil deposits (mumiyo), which form in front of the nests. Radiocarbon dating showed that the birds occupied the presently ice-free mountain ranges at least during the past 60 ka, which does not only imply un-glaciated terrestrial areas, but also points to the existence of marine feeding grounds with reduced sea ice, hence polynyas. In the proposed project we want use mumiyo deposits from different regions in East Antarctica for detailed reconstructions of marine and terrestrial environmental conditions. We suggest geochemical, paleontological and isotopic proxies to detect changes in the available food resources for snow petrels, in sea ice in coastal regions and in conditions at the terrestrial breeding habitat of snow petrels under glacial and Holocene conditions. This will lead to a better understanding of biogeochemical cycles, food web structure and the response of marine ecosystems to glacial climate conditions.

在最后的冰川最大值（LGM）期间，南极大陆周围扩大了冰架和海冰，影响了全球热 - 盐循环以及地方性的南极生物循环。在这些冰川条件下，沿海波利亚斯已被确定为南极底水形成的重要部位，也是海洋生物群的冰川避难所。关于这种波利尼亚人的存在的知识来自于莫德土地（东南极洲东部）的知识来自雪环的陆上繁殖地。过去的雪石化菌落的记录是胃油沉积物（Mumiyo），它们在巢前形成。放射性碳年代的日期表明，鸟类至少在过去60 ka中占据了目前无冰山的范围，这不仅暗示着未冰的陆地区域，而且还指出存在降低海冰的海洋饲养场，因此是多尼亚斯。在拟议的项目中，我们希望使用来自南极洲东部不同地区的Mumiyo矿床进行详细的海洋和陆地环境条件的重建。我们建议地球化学，古生物学和同位素代理，以检测雪气石的可用食品资源，沿海地区的海冰以及在冰川和全新世条件下的雪石油繁殖栖息地的状况。这将使人们对生物地球化学周期，食物网络结构以及海洋生态系统对冰川气候条件的反应有更好的了解。