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Paleoproductivity in the southern Peru-Chile Current through the last 33000 yr

机译：过去33000年间秘鲁南部-智利洋流的古生产力

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摘要

Based on a multiparameter approach including organic carbon, biogenic opal, carbonate and the species composition of planktic foraminifera, this paper provides the first qualitative assessment of the history of paleoproductivity on glacial-interglacial time scales in the southern Peru-Chile Current (PCC) off Chile, which belongs to the least studied parts of the world ocean During the Last Glacial Maximum (LGM) highest relative paleoproductivity of the last 33 kyr, indicated by high accumulation rates of organic carbon, biogenic opal and carbonate, has been found, contrasted by lowest values during the early and Middle Holocene. This shift from high to low productivity is accompanied by a major change in the species composition of planktic foraminifera from a dominance of Neogloboquadrina pachyderma (sin.) to the dominance of N. pachyderma (dex.). The temporal pattern of paleoproductivity off Chile is very similar to the history of the continental paleoclimate in the region, which is supposed to be driven by the position of the Southern Westerlies. This observation points to a functional relationship between the position of the Southern Westerlies and the history of paleoproductivity off Chile. Assuming that atmospheric and oceanographic circulation are closely linked, a northward displacement of the Antarctic Circumpolar Current during the LGM, in line with the northward movement of the Southern Westerlies, would bring the main nutrient source closer to our core sites resulting in increased productivity. However, based on the available data, it is not clear if the higher productivity in the southern PCC during the LGM reflects generally higher productivity during this time or only a regional displacement of the main productivity centers.
机译：基于多参数方法，包括有机碳，生物蛋白石，碳酸盐和板状有孔虫的物种组成，本文首次对秘鲁南部智利流（PCC）冰期-冰川间时间尺度上的古生产力历史进行了定性评估。智利是世界海洋中研究最少的部分，在最后一次冰期末期（LGM）期间，发现了最近33年来最高的相对古生产力，这是由有机碳，生物蛋白石和碳酸盐的高累积率所表明的，与之形成鲜明对比的是全新世早期和中期的最低值。从高生产率向低生产率的转变伴随着浮游有孔虫的物种组成发生了重大变化，从新球藻（neogloboquadrina pachyderma）（sin。）的优势变为帕克猪笼草（dex。N. pachyderma）的优势。智利外古生产力的时间模式与该地区大陆古气候的历史非常相似，该历史被认为是由西南西部地区的位置驱动的。这一观察结果表明，南部西部地区的位置与智利外古生产力的历史之间存在功能联系。假设大气和海洋环流是紧密相连的，在LGM期间南极绕极洋流的北移，与Western Westerlies的北移相一致，将使主要营养源更接近我们的核心地点，从而提高了生产力。但是，根据现有数据，尚不清楚在LGM期间南部PCC的较高生产率总体上反映了这段时间的较高生产率，还是仅反映了主要生产率中心的区域性位移。

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