Mechanisms of Interannual Variability of Ocean Bottom Pressure in the Southern Indian Ocean
The study of ocean bottom pressure (OBP) helps to understand the changes in the sea level budget and ocean deep circulation. In this study, the characteristics and mechanisms of interannual OBP variability in the Southern Indian Ocean are examined using Gravity Recovery and Climate Experiment (GRACE...
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Frontiers Media S.A.
2022-06-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2022.916592/full |
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| author | Yuting Niu Yuting Niu Xuhua Cheng Xuhua Cheng Jianhuang Qin Jianhuang Qin Niansen Ou Chengcheng Yang Chengcheng Yang Duotian Huang Duotian Huang |
| author_facet | Yuting Niu Yuting Niu Xuhua Cheng Xuhua Cheng Jianhuang Qin Jianhuang Qin Niansen Ou Chengcheng Yang Chengcheng Yang Duotian Huang Duotian Huang |
| author_sort | Yuting Niu |
| collection | DOAJ |
| description | The study of ocean bottom pressure (OBP) helps to understand the changes in the sea level budget and ocean deep circulation. In this study, the characteristics and mechanisms of interannual OBP variability in the Southern Indian Ocean are examined using Gravity Recovery and Climate Experiment (GRACE) satellite data from 2003 to 2016. Results show that there are two energetic OBP centers in the Southern Indian Ocean (50°–60°S, 40°–60°E and 45°–60°S, 80°–120°E). The OBP magnitudes at two centers have strong variability on interannual time scales, and their values are larger during austral summer (NDJF) and winter (JJAS). Atmospheric forcing plays an important role in local OBP variability. The high (low) sea level pressure (SLP) over the Southern Indian Ocean benefits positive (negative) OBP anomalies via the convergence (divergence) of Ekman transport driven by local wind. Such SLP anomalies are related to the Southern Annular Mode (SAM), Southern Oscillation (SO) and Indian Ocean dipole (IOD). SAM can influence the OBP changes in both austral summer and winter, while SO and IOD have positive correlations with OBP variability during austral summer and austral winter, respectively. These results are validated by a mass-conservation ocean model, which further confirms the importance of atmospheric forcing on the interannual OBP variations. |
| first_indexed | 2024-12-12T03:31:43Z |
| format | Article |
| id | doaj.art-b40805a206dd49afa352d0c1ac7b792c |
| institution | Directory Open Access Journal |
| issn | 2296-7745 |
| language | English |
| last_indexed | 2024-12-12T03:31:43Z |
| publishDate | 2022-06-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj.art-b40805a206dd49afa352d0c1ac7b792c2022-12-22T00:39:54ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452022-06-01910.3389/fmars.2022.916592916592Mechanisms of Interannual Variability of Ocean Bottom Pressure in the Southern Indian OceanYuting Niu0Yuting Niu1Xuhua Cheng2Xuhua Cheng3Jianhuang Qin4Jianhuang Qin5Niansen Ou6Chengcheng Yang7Chengcheng Yang8Duotian Huang9Duotian Huang10Key Laboratory of Marine Hazards Forecasting, Ministry of Natural Resources, Hohai University, Nanjing, ChinaCollege of Oceanography, Hohai University, Nanjing, ChinaKey Laboratory of Marine Hazards Forecasting, Ministry of Natural Resources, Hohai University, Nanjing, ChinaCollege of Oceanography, Hohai University, Nanjing, ChinaKey Laboratory of Marine Hazards Forecasting, Ministry of Natural Resources, Hohai University, Nanjing, ChinaCollege of Oceanography, Hohai University, Nanjing, ChinaCollege of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang, ChinaKey Laboratory of Marine Hazards Forecasting, Ministry of Natural Resources, Hohai University, Nanjing, ChinaCollege of Oceanography, Hohai University, Nanjing, ChinaKey Laboratory of Marine Hazards Forecasting, Ministry of Natural Resources, Hohai University, Nanjing, ChinaCollege of Oceanography, Hohai University, Nanjing, ChinaThe study of ocean bottom pressure (OBP) helps to understand the changes in the sea level budget and ocean deep circulation. In this study, the characteristics and mechanisms of interannual OBP variability in the Southern Indian Ocean are examined using Gravity Recovery and Climate Experiment (GRACE) satellite data from 2003 to 2016. Results show that there are two energetic OBP centers in the Southern Indian Ocean (50°–60°S, 40°–60°E and 45°–60°S, 80°–120°E). The OBP magnitudes at two centers have strong variability on interannual time scales, and their values are larger during austral summer (NDJF) and winter (JJAS). Atmospheric forcing plays an important role in local OBP variability. The high (low) sea level pressure (SLP) over the Southern Indian Ocean benefits positive (negative) OBP anomalies via the convergence (divergence) of Ekman transport driven by local wind. Such SLP anomalies are related to the Southern Annular Mode (SAM), Southern Oscillation (SO) and Indian Ocean dipole (IOD). SAM can influence the OBP changes in both austral summer and winter, while SO and IOD have positive correlations with OBP variability during austral summer and austral winter, respectively. These results are validated by a mass-conservation ocean model, which further confirms the importance of atmospheric forcing on the interannual OBP variations.https://www.frontiersin.org/articles/10.3389/fmars.2022.916592/fullocean bottom pressureSouthern Indian Oceanwind forcingsea level pressure anomalyEkman transport |
| spellingShingle | Yuting Niu Yuting Niu Xuhua Cheng Xuhua Cheng Jianhuang Qin Jianhuang Qin Niansen Ou Chengcheng Yang Chengcheng Yang Duotian Huang Duotian Huang Mechanisms of Interannual Variability of Ocean Bottom Pressure in the Southern Indian Ocean Frontiers in Marine Science ocean bottom pressure Southern Indian Ocean wind forcing sea level pressure anomaly Ekman transport |
| title | Mechanisms of Interannual Variability of Ocean Bottom Pressure in the Southern Indian Ocean |
| title_full | Mechanisms of Interannual Variability of Ocean Bottom Pressure in the Southern Indian Ocean |
| title_fullStr | Mechanisms of Interannual Variability of Ocean Bottom Pressure in the Southern Indian Ocean |
| title_full_unstemmed | Mechanisms of Interannual Variability of Ocean Bottom Pressure in the Southern Indian Ocean |
| title_short | Mechanisms of Interannual Variability of Ocean Bottom Pressure in the Southern Indian Ocean |
| title_sort | mechanisms of interannual variability of ocean bottom pressure in the southern indian ocean |
| topic | ocean bottom pressure Southern Indian Ocean wind forcing sea level pressure anomaly Ekman transport |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2022.916592/full |
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