人类在南大洋的二氧化碳运输是由Ekman流驱动的
1Department of Atmospheric Science, Colorado State University, 1371 Campus Delivery, Fort Collins, Colorado 80523-1371, USA. ito@atmos.colostate.edu
Nature
|January 8, 2010
概括
南大洋作为一个重要的碳汇,吸收人为二氧化碳 (CO2). 风力驱动的Ekman运输是将二氧化碳跨越前沿的关键,影响气候变化.
科学领域:
- 海洋学 海洋学 海洋学
- 气候科学 气候科学
- 碳循环研究 碳循环研究
背景情况:
- 南大洋的大面积和循环表明,它是人类制造的二氧化碳 (CO2) 的主要沉积点.
- 二氧化碳吸收,运输和由海洋流 (Ekman流,) 调节的机制仍然不太清楚.
- 风力驱动的流动,中等层次的和俯冲之间的相互作用影响了碳运输路径.
研究的目的:
- 研究控制南大洋人为二氧化碳沉降的机制.
- 分析二氧化碳吸收和运输在两年时间内的年内变化.
- 确定埃克曼流和在二氧化碳运输中的相对作用.
主要方法:
- 利用了高分辨率的海洋循环和碳循环模型.
- 专注于人类二氧化碳在两年的年内变化.
- 在密度坐标中使用预算分析.
主要成果:
- 碳吸收模式与海洋垂直交换相关,在南极极地极前线达到顶峰.
- 埃克曼运输是区域集成,横向的二氧化碳运输的主要驱动力,旋在当地发挥着作用.
- 跨越前线运输的年内变化主要由Ekman流控制,旋补偿最小.
- 穿过极地阵线的风力驱动运输和亚热带阵线的降温至关重要.
结论:
- 海洋碳吸收与气候变化密切相关,通过Ekman运输的时间变化.
- 埃克曼流是跨越南洋前线的大规模二氧化碳运输的主要机制.
- 了解这些动态对于准确建模全球碳预算和气候变化影响至关重要.
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