旋驱动的潜水从春季开花的有机碳颗粒出口
Melissa M Omand1, Eric A D'Asaro2, Craig M Lee2
1Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA.
Science (New York, N.Y.)
|March 28, 2015
概括
海洋旋可以将有机颗粒碳 (POC) 运送到深海,挑战传统的沉没模型. 这种旋转驱动的流动是海洋的重要,但被忽视的组成部分.
科学领域:
- 海洋学 海洋学 海洋学
- 海洋生物地质化学海洋生物地质化学
- 物理海洋学 物理海洋学
背景情况:
- 微粒有机碳 (POC) 出口到海洋深处对于生物碳至关重要.
- 传统上,POC出口仅归因于粒子被动沉没.
研究的目的:
- 调查动态海洋流,特别是,在POC的垂直运输中的作用.
- 量化旋驱动的POC运输对北大西洋总体碳出口的贡献.
主要方法:
- 在北大西洋春季开花期间利用自主滑翔机观测.
- 采用高分辨率海洋学建模来模拟旋动态和POC运输.
- 分析了水的特性,包括POC,叶绿素,氧气和温度-盐度在各种深度.
主要成果:
- 在100-350米深处观察到具有地表水特性 (高POC,叶绿素,氧气) 的异常特征.
- 模拟的POC丰富的地表水沿周边沿着连贯的,丝状的特征下降.
- 鉴定了以亚尺度旋驱动的POC流量作为一个重要的出口途径.
结论:
- 动态旋场积极地将含有不沉积POC的地表水浸入中等深度.
- 旋驱动的POC流量可以占到春季POC出口总量的一半,在富有生产力的次极海洋.
- 目前的全球碳循环模型可能会低估POC出口,原因是未解决的旋转驱动运输机制.
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