GRACE 时代东海海洋质量预算调查

IF 2.1 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Journal of Geodynamics Pub Date : 2024-07-06 DOI:10.1016/j.jog.2024.102043
Yanchao Gu , Jun Huang , Lingyan Xiong , Feilong Huang , Yong Su , Yu Lei , Hongbo Yuan
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引用次数: 0

摘要

重力恢复与气候实验(GRACE)任务为监测海洋质量变化(OMC)提供了独一无二的高精度观测数据,可结合卫星测高、温度和盐度观测数据建立和评估海洋质量预算。然而,由于单个模式的潜在偏差和缺乏一定的数据处理,在中国东海(ECS)进行 OMC 闭环验证具有挑战性。在本研究中,我们利用多种数据集,主要包括三个官方 GRACE RL06 解决方案、三个测高产品和四个海洋再分析产品,全面分析了 GRACE 时期(2005-2015 年)东海的海洋质量预算。以往研究中忽略的海底形变的影响为-0.38±0.06毫米/年,我们从测高产品中估算出更精确的ECS海平面变化集合为4.05±1.50毫米/年。在季节性信号和长期趋势方面,经泄漏校正的 GRACE OMC 观测值与经立体校正的高度计 OMC 估计值之间存在差异(例如,6.25 毫米/年与 4.22 毫米/年)。这些差异与长江径流沉积物和原位沉积物观测结果密切相关,表明在 ECS 海洋质量预算中应考虑海洋沉积物的累积。由于原位沉积物数据的估算期为 100 年,我们采用经验估算法确定 2005-2015 年期间的相应数据,以避免观测时间跨度不一致造成的潜在偏差。结果表明,沉积物质量变化可以解释约 96% 的残差趋势。我们的结果强调了沉积物对改善 ECS 海洋质量预算的重要影响,为估算其他沿海地区的海洋质量变化提供了一个新的视角。
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An investigation of ocean mass budget in the East China Sea during the GRACE era

The Gravity Recovery and Climate Experiment (GRACE) mission provides uniquely high-precision observations for monitoring ocean mass changes (OMC), allowing for the establishment and evaluation of the ocean mass budget in conjunction with satellite altimetry and temperature and salinity observations. However, it is challenging to perform OMC closed-loop validation in the East China Sea (ECS) due to potential biases in the individual model and the lack of certain data processing. In this study, we comprehensively analyze the ocean mass budget in the ECS during the GRACE era (2005–2015) by utilizing multiple datasets, mainly consisting of three official GRACE RL06 solutions, three altimetry products, and four ocean reanalysis products. The effect of ocean bottom deformation, neglected in previous studies, is −0.38 ± 0.06 mm/yr, and we estimate a more accurate ensemble sea level change to be 4.05 ± 1.50 mm/yr in the ECS from the altimetry products. There are discrepancies between leakage-corrected GRACE OMC observations and steric-corrected altimeter OMC estimations in both the seasonal signals and the long-term trends (e.g., 6.25 mm/yr vs. 4.22 mm/yr). These discrepancies are strongly correlated with sediment runoff from the Yangtze River and in-situ sediment observations, suggesting that ocean sediment accumulation should be considered in the ocean mass budget in the ECS. Since in-situ sediment data are estimated over ∼100 years, we employ an empirical estimation method to determine the corresponding data during the period 2005–2015, to avoid potential biases caused by inconsistencies in observational timespans. The results show that sediment mass changes can explain about 96 % of residual trends. Our results emphasize the significant impact of sediment on improving the ocean mass budget in the ECS, offering a novel perspective for estimating ocean mass changes in other coastal regions.

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来源期刊
Journal of Geodynamics
Journal of Geodynamics 地学-地球化学与地球物理
CiteScore
4.60
自引率
0.00%
发文量
21
审稿时长
6-12 weeks
期刊介绍: The Journal of Geodynamics is an international and interdisciplinary forum for the publication of results and discussions of solid earth research in geodetic, geophysical, geological and geochemical geodynamics, with special emphasis on the large scale processes involved.
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