Hurricanes Enhance Labile Carbon Export to the Deep Ocean
Hurricanes Enhance Labile Carbon Export to the Deep Ocean
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DOI：
10.1029/2019gl083719
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发表时间：
2019-09-07
影响因子：
5.2
通讯作者：
Johnson, R.
中科院分区：
文献类型：
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作者：
Pedrosa-Pamies, R.;Conte, M. H.;Johnson, R.
热带气旋（飓风）造成强烈的表层海洋冷却和垂直混合，导致营养物质涌上透光层，浮游植物间歇性大量繁殖。然而，它们对深海的影响仍然未知。在这里，我们提出的证据表明，飓风也影响海洋的生物泵，通过加强出口不稳定的有机物质到深海。2016年10月，三级飓风妮可经过大西洋西北部贫营养的百慕大时间序列网站。在Nicole通过后，新鲜植物碎屑、浮游动物和微生物生物量的脂质微粒通量在1，500米深度增加了30-300%，在3，200米深度增加了30-800%。Nicole之后的中层悬浮颗粒也富含植物碎屑物质以及浮游动物和细菌脂质，表明颗粒解聚和深水生态系统反应。预测的气候引起的飓风频率和/或强度的增加可能会通过增加生物泵的强度来显著改变海洋生物地球化学循环。
Tropical cyclones (hurricanes) generate intense surface ocean cooling and vertical mixing resulting in nutrient upwelling into the photic zone and episodic phytoplankton blooms. However, their influence on the deep ocean remains unknown. Here we present evidence that hurricanes also impact the ocean's biological pump by enhancing export of labile organic material to the deep ocean. In October 2016, Category 3 Hurricane Nicole passed over the Bermuda Time Series site in the oligotrophic NW Atlantic Ocean. Following Nicole's passage, particulate fluxes of lipids diagnostic of fresh phytodetritus, zooplankton, and microbial biomass increased by 30-300% at 1,500 m depth and 30-800% at 3,200 m depth. Mesopelagic suspended particles following Nicole were also enriched in phytodetrital material and in zooplankton and bacteria lipids, indicating particle disaggregation and a deepwater ecosystem response. Predicted climate-induced increases in hurricane frequency and/or intensity may significantly alter ocean biogeochemical cycles by increasing the strength of the biological pump.