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.

南大洋的大西洋部分是底层水、深层水和中层水形成的关键区域，因此是经向翻转环流的重要组成部分，也是与气候相关的人为碳（Cant）的重要汇。南极底层水（AABW）和南极中层水（AAIW）的形成过程中被大气界面吸收并从大气中排出，尽管这些水很重要，但它们的形成却受到气候变化的影响。该地区的斜面库存和 AABW 和 AAIW 的相关形成率尚不清楚，并且时间变化的估计也相当不确定。本提案的主要目的是 1. 确定南大西洋的斜面库存，特别是在南大洋。 AABW 和 AAIW，基于来自封闭箱 (2008-2010) 的瞬态示踪剂 (CFC) 数据，并将结果与 1984 年开始的示踪剂数据的库存估算进行比较。 2. 比较使用基于 CFC 的方法计算的 Cant 清单以及基于“经典”方法（ΔC*、线性回归等）的 Cant 清单 3. 计算南大西洋 AABW 和 AAIW 的形成率（闭箱数据，2008 年-）。 2010）及其变化（自 1984 年以来），并量化进入南大西洋、德雷克海峡以及穿过本初子午线向东的出口率 4. 应用新开发的方法。最大熵反演以确定 AABW 和 AAIW 的空间起源和渡越时间尺度以及相关的 Cant 清单，并将结果与“经典”瞬态示踪剂方法进行比较。