利用数据插值变分分析建立新的世界海洋氧图谱

IF 1.9 4区 地球科学 Q2 ENGINEERING, OCEAN Journal of Atmospheric and Oceanic Technology Pub Date : 2023-09-21 DOI:10.1175/jtech-d-23-0007.1
Christopher J. Roach, Nathaniel L. Bindoff
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引用次数: 0

摘要

摘要:我们提出了一个新的全球氧图谱。该地图集使用了2018年发布的《世界海洋地图集》中所有可用的完整水柱氧气、盐度和温度剖面图。我们使用数据插值变分分析(DIVA)方法代替最佳插值,将可用剖面映射到地表至6800米之间的108个深度级别,覆盖99%以上的海洋体积。这张1/2°× 1/2°地图集以1年为间隔,涵盖了1955年至2018年的时间。DIVA方法与传统的最优插值方法相比具有显著的优势。它允许明确地包括平流和边界约束,从而改进了强流区域和靠近海岸边界的氧气、盐度和温度的表示。我们通过本图集中的一些示例来演示这种映射方法的这些优点。我们可以探索全球海洋中氧气的区域和时间变化。初步分析证实了先前的分析,即东太平洋的氧气最小带已经扩大和加强。评估了1970年至2010年间氧库存量的变化,并与先前的研究进行了比较。我们发现,海洋全氧库存量下降了0.84%±0.42%。在这一时期,温度驱动的溶解度变化解释了整个水柱中约21%的氧气减少,在100米以上的溶解度变化可以解释所有的氧气减少,在100-600米深度范围内,它只能解释29%,在600米至1000米之间可以解释19%,在深海中只有11%。
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Developing a New Oxygen Atlas of the World’s Oceans Using Data Interpolating Variational Analysis
Abstract We present a new global oxygen atlas. This atlas uses all of the available full water column profiles of oxygen, salinity and temperature available as part of the World Ocean Atlas released in 2018. Instead of optimal interpolation we use the Data Interpolating Variational Analysis (DIVA) approach to map the available profiles onto 108 depth levels between the surface and 6800 m, covering more than 99% of ocean volume. This 1/2° × 1/2° degree atlas covers the period 1955 to 2018 in 1 year intervals. The DIVA method has significant benefits over traditional optimal interpolation. It allows the explicit inclusion of advection and boundary constraints thus offering improvements in the representations of oxygen, salinity and temperature in regions of strong flow and near coastal boundaries. We demonstrate these benefits of this mapping approach with some examples from this atlas. We can explore the regional and temporal variations of oxygen in the global oceans. Preliminary analyses confirm earlier analyses that the oxygen minimum zone in the eastern Pacific Ocean has expanded and intensified. Oxygen inventory changes between 1970 and 2010 are assessed and compared against prior studies. We find that the full ocean oxygen inventory decreased by 0.84%±0.42%. For this period temperature driven solubility changes explain about 21% of the oxygen decline over the full water column, in the upper 100 m solubility changes can explain all of the oxygen decrease, for the 100-600 m depth range it can explain only 29%, 19% between 600 m and 1000 m, and just 11% in the deep ocean.
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来源期刊
CiteScore
4.50
自引率
9.10%
发文量
135
审稿时长
3 months
期刊介绍: The Journal of Atmospheric and Oceanic Technology (JTECH) publishes research describing instrumentation and methods used in atmospheric and oceanic research, including remote sensing instruments; measurements, validation, and data analysis techniques from satellites, aircraft, balloons, and surface-based platforms; in situ instruments, measurements, and methods for data acquisition, analysis, and interpretation and assimilation in numerical models; and information systems and algorithms.
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