| 基于再分析数据的南大西洋上层海洋热含量变化研究 |
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| 引用本文： | 邓绍坤,吴祥柏.基于再分析数据的南大西洋上层海洋热含量变化研究[J].海洋学研究,2019,37(3):12-20. |
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| 作者姓名： | 邓绍坤 吴祥柏 |
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| 作者单位： | 河海大学海洋学院,江苏南京210098;卫星海洋环境动力学国家重点实验室,浙江杭州310012;自然资源部第二海洋研究所,浙江杭州310012;河海大学海洋学院,江苏南京210098 |
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| 基金项目： | 中央高校基本科研业务费资助(2016B11614) |
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| 摘 要： | 南大西洋在地理上连接着北大西洋、南大洋和印度洋。通过环流输运或海表温度变化,该海域的上层海洋热含量(OHC)的变化可能对与之相连的各个洋盆间的再分布产生影响。本文基于1958—2015年的ORAS4全球海洋再分析数据和中国科学院大气物理研究所的格点海温数据集,利用经验正交函数(EOF)分析、相关分析等方法,分析了南大西洋上层海洋不同积分深度(0~100 m,0~300 m,0~500 m,0~700 m)OHC的时空变化特征。EOF第一模态显示,过去60 a来,南大西洋上层700 m存在一个洋盆尺度的变暖趋势,而且随着热含量积分深度的增加,第一模态所解释的方差占比也明显增加。OHC变化EOF第一模态与以年际变化为主的NAO和ENSO指数相关性很低,而与代表较长时间变率的AMO和PDO指数却有较好相关性,且与AMO的相关性随着积分深度的增加而提高。超前滞后相关分析显示AMO滞后南大西洋OHC变化9~12 a,显示南大西洋OHC变化对北大西洋气候变化的潜在影响。南大西洋OHC变化EOF第一模态与PDO之间相关性随着积分深度的增加而降低,显示PDO对OHC的影响主要在表层。另外发现整个洋盆的热含量变化与温跃层变化呈正相关,热含量的变化反映温跃层的动态波动。
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| 关 键 词： | 南大西洋 海洋热含量 时空变化 AMO PDO |
| 收稿时间： | 2019-04-04 |
Upper-layer ocean heat content variability in the Southern Atlantic from reanalysis data |
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| DENG Shao-kun,WU Xiang-bai.Upper-layer ocean heat content variability in the Southern Atlantic from reanalysis data[J].Journal of Marine Sciences,2019,37(3):12-20. |
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| Authors: | DENG Shao-kun WU Xiang-bai |
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| Affiliation: | 1. College of Oceanography, Hohai University, Nanjing 210098, China; 2. State Key Laboratory of Satellite Ocean Environment Dynamics,Hangzhou 310012,China; 3. Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,China |
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| Abstract: | The South Atlantic Ocean (SAO) connects the North Atlantic, Indian and Southern Oceans. The variability of SAO Ocean Heat Content (OHC) would improve our understandings of the heat redistribution among global ocean basins in a warming climate. In is study, we analyze the spatial and temporal variability of the upper-layer OHC of SAO from European Centre for Medium-Range Weather Forecasts Ocean Reanalysis System 4 data sets and temperature data sets of Institute of Atmospheric Physics of the Chinese Academy of Sciences. Using empirical orthogonal function (EOF) analysis, the OHC of upper 700 m in the Southern Atlantic shows a basin wide warming during the past 60 years. This warming trend is even more apparent and have longer fluctuation cycle with a deeper integration depth for OHC. Correlation analysis shows that leading EOF mode of SAO OHC is dominated by decadal or longer time scale variabilities, with a 9-12 years leading of AMO, suggesting SAO OHC contribute to the North Atlantic climate variation. The SAO OHC-AMO correlation increases with the increased OHC integration depth while SAO OHC-PDO correlation decreases. Besides, it is found that variation of OHC in the whole basin is positively correlated with variation of thermocline depth, and the variation of OHC reflects the dynamical fluctuation in the thermocline. |
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| Keywords: | Southern Atlantic Ocean upper layer ocean heat content spatial and temporal variability AMO PDO |
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