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Inventories of anthropogenic carbon and their variability in the Atlantic sector of the Southern Ocean, 1984-2010

1984-2010 年南大洋大西洋区人为碳清单及其变化

基本信息

批准号：
171784628
负责人：
Dr. Oliver Huhn
金额：
--
依托单位：
Abteilung Ozeanographie
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2010
资助国家：
德国
起止时间：
2009-12-31 至 2012-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/171784628?language=en
关键词：
Inventories anthropogenic carbon their variability

项目摘要

The Atlantic sector of the Southern Ocean is a key area for the formation of bottom, deep and intermediate water. It is, hence, an important component of the Meridional Overturning Circulation and a significant sink for atmospheric gases. Climate relevant anthropogenic carbon (Cant) is taken up at the atmospheric interface and exported from the atmosphere during Antarctic Bottom Water (AABW) and Antarctic Intermediate Water (AAIW) formation. In turn, formation of these waters are influenced by climate change. Despite their importance, Cant inventories and related formation rates of AABW and AAIW in that area are not well known, and estimates of the temporal variability are quite uncertain. The major aims of this proposal are 1. to determine the Cant inventories in the Atlantic Southern Ocean, especially in AABW and AAIW, based on transient tracer (CFC) data from a closed box (2008-2010), and to compare the results with inventory estimates from tracer data starting in 1984. 2. compare the Cant inventories calculated with the CFC based methods with Cant inventories based on “classical” methods (ΔC*, linear regression, etc.). 3. to calculate formation rates of AABW and AAIW in the Atlantic Southern Ocean (closed box data, 2008-2010) and their changes (since 1984) and to quantify export rates into the South Atlantic, into Drake Passage, and towards the east across the Prime Meridian. 4. to apply a newly developed method of maximum entropy inversion to determine the spatial origin and the transit time scales of AABW and AAIW and the related Cant inventories and to compare the results with “classical” transient tracer methods.

南大洋大西洋区段是形成底层、深层和中层水的关键区域。因此，它是经向翻转环流的重要组成部分，也是大气气体的重要汇。与气候相关的人为碳(Cant)在南极底层水(AABW)和南极中间水(AAIW)形成过程中被大气界面吸收并从大气中输出。反过来，这些水域的形成又受到气候变化的影响。尽管它们很重要，但该地区AABW和AAIW的Cant库存和相关形成速度并不为人所知，而且对时间变异性的估计也相当不确定。这项提案的主要目的是：1.根据封闭箱(2008-2010年)的瞬变示踪剂数据，确定南大西洋，特别是大西洋、北大西洋和南大西洋的Cant库存，并将结果与从1984年开始的示踪剂数据估计的库存进行比较。2.将基于氯氟化碳的方法计算的铁路超高库存与基于经典方法(ΔC*、线性回归等)计算的铁路超高库存进行比较。3.计算南大西洋AABW和AAIW的形成速率(2008-2010年封闭箱数据)及其变化(自1984年以来)，并量化进入南大西洋、进入德雷克航道和向东穿过本初子午线的出口速率。4.应用一种新发展的最大熵反演方法确定AABW和AAIW的空间原点和通过时间尺度以及相关的铁路超高清单，并与经典的瞬时示踪方法进行比较。