Slower nutrient stream suppresses Subarctic Atlantic Ocean biological productivity in global warming

Slower nutrient stream suppresses Subarctic Atlantic Ocean biological productivity in global warming
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在全球变暖过程中,营养物质流变慢抑制了亚北极大西洋的生物生产力

DOI:
10.1073/pnas.2000851117
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发表时间:
2020
期刊:
Proceedings of the National Academy of Sciences
影响因子:
--
通讯作者:
Jansen, Malte F.
Jansen, Malte F.
中科院分区:
--
文献类型:
--
作者:
Whitt, Daniel B.;Jansen, Malte F.

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地球系统模式(ESMs)预测,全球变暖抑制了亚北极大西洋的生物生产力,因为海洋表面浮力的增加抑制了营养供应的两个物理驱动因素:垂直混合和经向环流。然而,生产力对地表浮力的定量敏感性是不确定的,物理驱动因素的相对重要性是未知的。在这里,我们提出了一个简单的预测理论,说明在21世纪全球变暖情景下,混合、环流和生产力如何响应地表浮力的增加。由于观测值限制了参数,该理论认为,由于海洋环流变慢,向北输送的营养物质减少,这解释了气候变暖导致生产力下降的主要原因。这一理论也为一系列ESM模拟中的当今偏见以及21世纪预测的物理基础提供了依据。因此,这种理论理解可以促进改进21世纪海洋生物地球化学和生态系统预测的发展。
Earth system models (ESMs) project that global warming suppresses biological productivity in the Subarctic Atlantic Ocean as increasing ocean surface buoyancy suppresses two physical drivers of nutrient supply: vertical mixing and meridional circulation. However, the quantitative sensitivity of productivity to surface buoyancy is uncertain and the relative importance of the physical drivers is unknown. Here, we present a simple predictive theory of how mixing, circulation, and productivity respond to increasing surface buoyancy in 21st-century global warming scenarios. With parameters constrained by observations, the theory suggests that the reduced northward nutrient transport, owing to a slower ocean circulation, explains the majority of the reduced productivity in a warmer climate. The theory also informs present-day biases in a set of ESM simulations as well as the physical underpinnings of their 21st-century projections. Hence, this theoretical understanding can facilitate the development of improved 21st-century projections of marine biogeochemistry and ecosystems.
垂直湍流混合造成的营养物质供应:东北大西洋豪猪深海平原研究地点的一项研究
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