Global Patterns of Spatial and Temporal Variability in Salinity from Multiple Gridded Argo Products
Global Patterns of Spatial and Temporal Variability in Salinity from Multiple Gridded Argo Products
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DOI：
10.1175/jcli-d-20-0053.1
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发表时间：
2020-10
影响因子：
4.9
通讯作者：
Chao Liu;Xin‐Zhong Liang;D. Chambers;R. Ponte
中科院分区：
文献类型：
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作者：
Chao Liu;Xin‐Zhong Liang;D. Chambers;R. Ponte
盐度是一个基本的海洋状态变量，并已被用来推断有关气候变化和变率的重要信息。以前的研究发现，基于Argo测量的各种客观海洋分析中的盐度变化不一致。然而，据我们所知，还没有对这些不一致之处以及阿尔戈数据库产品中盐度变化的强有力的空间和时间特征进行全面评估。在这里，我们比较和评估海洋盐度的变化，从五个客观的海洋分析，完全或主要基于Argo测量其重叠期间，从2005年至2015年。我们研究了在海面和两个深度间隔（0-700和700-2000米）内的盐度变化。我们的研究结果表明，气候平均值一般是一致的所有检查的产品，虽然区域差异是显而易见的，在地下海洋。盐度变化的时间演变，垂直结构，和领先的ESTA模式显示出良好的协议之间的大多数检查的产品，表明一些强大的功能，可以通过检查网格Argo产品的盐度变化。然而，这些变化存在着显著的差异，特别是在北大西洋和南大洋的次表层。此外，尽管部署在海洋中的阿尔戈浮标数量不断增加，但随着时间的推移，差异并没有显著减少。我们的分析，特别是产品之间的差异，可以作为一个有用的参考，利用和改进现有的客观海洋分析的基础上Argo测量。
Salinity is one of the fundamental ocean state variables and has been used to infer important information about climate change and variability. Previous studies have found inconsistent salinity variations in various objective ocean analyses that are based on the Argo measurements. However, as far as we are aware, a comprehensive assessment of those inconsistencies, as well as robust spatial and temporal features of salinity variability among the Argo-based products, has not been conducted. Here we compare and evaluate ocean salinity variability from five objective ocean analyses that are solely or primarily based on Argo measurements for their overlapping period from 2005 to 2015. We examine the salinity variability at the sea surface and within two depth intervals (0–700 and 700–2000 m). Our results show that the climatological mean is generally consistent among all examined products, although regional discrepancies are evident in the subsurface ocean. The time evolution, vertical structure, and leading EOF modes of salinity variations show good agreement among most of the examined products, indicating that a number of robust features of the salinity variability can be obtained by examining gridded Argo products. However, significant discrepancies in these variations exist, particularly in the subsurface North Atlantic and Southern Oceans. Also, despite the increasing number of Argo floats deployed in the ocean, the discrepancies were not significantly reduced over time. Our analyses, particularly those of the discrepancies between products, can serve as a useful reference for utilizing and improving the existing objective ocean analyses that are based on Argo measurements.