On the seasonal variations of ocean bottom pressure in the world oceans

Seasonal variability of the ocean bottom pressure (OBP) in the world oceans is investigated using 15 years of GRACE observations and a Pressure Coordinate Ocean Model (PCOM). In boreal winter, negative OBP anomalies appear in the northern North Pacific, subtropical South Pacific and north of 40 °S i...

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Bibliographic Details
Published in:Geoscience letters 2021-10, Vol.8 (1), p.1-12, Article 29
Main Authors: Cheng, Xuhua, Ou, Niansen, Chen, Jiajia, Huang, Rui Xin
Format: Article
Language:English
Subjects:
Anomalies
Atmospheric Sciences
Biogeosciences
Bottom pressure
Earth and Environmental Science
Earth Sciences
Ekman transport
Freshwater
Geophysics/Geodesy
GRACE
Heat flux
Heat transfer
Inland water environment
Ocean bottom
Ocean bottom pressure
Ocean floor
Ocean models
Oceanography
Oceans
PCOM
Planetology
Pressure
Research Letter
Sea level
Sea level pressure
Seasonal variation
Seasonal variations
Wind
Winter
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Summary:Seasonal variability of the ocean bottom pressure (OBP) in the world oceans is investigated using 15 years of GRACE observations and a Pressure Coordinate Ocean Model (PCOM). In boreal winter, negative OBP anomalies appear in the northern North Pacific, subtropical South Pacific and north of 40 °S in the Indian Ocean, while OBP anomaly in the Southern Ocean is positive. The summer pattern is opposite to that in winter. The centers of positive (negative) OBP signals have a good coherence with the mass convergence/divergence due to Ekman transport, indicating the importance of wind forcing. The PCOM model reproduces the observed OBP quite well. Sensitivity experiments indicate that wind forcing dominates the regional OBP seasonal variations, while the contributions due to heat flux and freshwater flux are unimportant. Experiments with daily sea level pressure (SLP) forcing suggest that at high frequencies the non-static effect of SLP is not negligible.
ISSN:2196-4092
2196-4092
DOI:10.1186/s40562-021-00199-3