Dynamics of seasonal and interannual variability of the ocean bottom pressure in the Southern Ocean

Xiong, Xiaoqin; Cheng, Xuhua; Ou, Niansen; Feng, Tao; Qin, Jianhuang; Chen, Xiao; Huang, Rui Xin

doi:10.1007/s13131-021-1878-z

Cited by 3 publications

(6 citation statements)

References 36 publications

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“…Considering the dominant role of wind stress curl on OBP variations in the Southern Ocean (Xiong et al., 2022), we can simplify Equation to

{\eta }_{bt}^{x}\approx \int \nolimits_{xe}^{x}\frac{1}{\beta }\left(\frac{f}{\rho g}\nabla \times \frac{\tau }{h}\right)dx

. The meridional difference of reconstructed OBP between northern and SB was calculated using ERA5 wind stress (black lines in Figures 5g–5i).…”

Section: Resultsmentioning

confidence: 99%

“…Based on barotropic vorticity equation, recent studies have investigated the low‐frequency OBP variations in the Southern Ocean, and revealed that compared to other effects, the OBP variations are primarily dominated by the forcing of wind stress curl, combined with realistic bottom topography (Boening et al., 2011; Qin et al., 2022; Xiong et al., 2022). Figure 3a shows regression maps of the standardized zonal‐mean ACC transport with OBP (colors) and Ekman transport (vectors) for the period of April 2002–June 2017.…”

Section: Resultsmentioning

confidence: 99%

“…Considering the dominant role of wind stress curl on OBP variations in the Southern Ocean (Xiong et al, 2022), we can simplify Equation 8to…”

Section: Interbasin Differences Of the Acc Transportmentioning

confidence: 99%

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Interbasin Differences in Interannual Variations of the Antarctic Circumpolar Current Transport

Yang,

Cheng,

von Storch

et al. 2023

JGR Oceans

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Despite the critical role of the Antarctic Circumpolar Current (ACC) in global convey belt, its temporal variability and spatial difference are poorly investigated due to the lack of full‐depth observations. This study quantitatively investigates the interannual variability of the ACC transport in different basins using Gravity Recovery and Climate Experiment (GRACE) ocean bottom pressure (OBP) data and In Situ Analysis System 17 (ISAS17) temperature and salinity fields. The results reveal that the interannual variation differs significantly in the Indian basin, the Pacific and Atlantic basins, and is likely caused by the meridional distribution of the wind stress curl, rather than the westerly winds. The interannual variation is correlated with the Southern Annular Mode (SAM) in the Indian basin, but also modulated by El Niño–Southern Oscillation (ENSO) in the Pacific and Atlantic basins. The results are further verified by a mass conservation ocean model with elaborating the important influence of both local and global atmospheric variability on the spatial‐temporal variability of the ACC. The difference of the ACC transports in the major basins might be ascribed to the respective meridional transport in each basin.

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“…Considering the dominant role of wind stress curl on OBP variations in the Southern Ocean (Xiong et al., 2022), we can simplify Equation to

{\eta }_{bt}^{x}\approx \int \nolimits_{xe}^{x}\frac{1}{\beta }\left(\frac{f}{\rho g}\nabla \times \frac{\tau }{h}\right)dx

. The meridional difference of reconstructed OBP between northern and SB was calculated using ERA5 wind stress (black lines in Figures 5g–5i).…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Interbasin Differences in Interannual Variations of the Antarctic Circumpolar Current Transport

Yang,

Cheng,

von Storch

et al. 2023

JGR Oceans

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“…After the 600-years spin-up integration, the monthly atmospheric forcing is used to force the model from January 1990 to December 2018 (see Cheng et al (2021) for a more detailed model setup). The model output has a 1°×1° horizontal resolution and 60 pressure layers, which has been successfully applied examining OBP variations in the Southern Ocean (Niu et al, 2022;Qin et al, 2022;Xiong et al, 2022).…”

Section: Methodsmentioning

confidence: 99%

Acceleration of Antarctic Circumpolar Current at the Drake Passage during the GRACE era

Yang

Cheng

Huang

et al. 2022

Preprint

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Previous studies have identified intense climatic change in the Southern Ocean. However, the response of ACC transport to climate change is not fully understood. In this study, by using in-situ ocean bottom pressure (OBP) records and five GRACE products, long-term variations of ACC transport are studied. Our results confirm the reliability of GRACE CSR mascon product in ACC transport estimation at the Drake Passage. Superimposed on interannual variability, ACC transport exhibits an obvious increasing trend (1.32±0.07Sv year -1 ) during the GRACE era. Based on results of a mass-conservation ocean model simulation, we suggest that the acceleration of ACC is associated with intensified westerly winds and loss of land ice in Antarctica.

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“…Early, relatively noisy estimates of the seasonal cycle based on the initial releases of the GRACE data (Bingham & Hughes, 2006;Kanzow et al, 2005;Ponte et al, 2007) have given way to more stable estimates based on longer records and improved data releases (Cheng et al, 2021;Johnson & Chambers, 2013). Although observations and simplified models consistently represent major features of the seasonal cycle in p b and provide a similar qualitative description of its properties at regional scales (e.g., Peralta-Ferriz & Morison, 2010;Piecuch, 2015;, it is also evident that substantial differences remain in seasonal behavior when examined over the global oceans (e.g., Cheng et al, 2021;Xiong et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

How Well Do We Know the Seasonal Cycle in Ocean Bottom Pressure?

Ponte,

Zhao,

Schindelegger

2024

Earth and Space Science

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We revisit the nature of the ocean bottom pressure (pb) seasonal cycle by leveraging the mounting GRACE‐based pb record and its assimilation in the ocean state estimates produced by the project for Estimating the Circulation and Climate of the Ocean (ECCO). We focus on the mean seasonal cycle from both data and ECCO estimates, examining their similarities and differences and exploring the underlying causes. Despite substantial year‐to‐year variability, the 21‐year period studied (2002–2022) provides a relatively robust estimate of the mean seasonal cycle. Results indicate that the pb annual harmonic tends to dominate but the semi‐annual harmonic can also be important (e.g., subpolar North Pacific, Bellingshausen Basin). Amplitudes and short‐scale phase variability are enhanced near coasts and continental shelves, emphasizing the importance of bottom topography in shaping the seasonal cycle in pb. Comparisons of GRACE and ECCO estimates indicate good qualitative agreement, but considerable quantitative differences remain in many areas. The GRACE amplitudes tend to be higher than those of ECCO typically by 10%–50%, and by more than 50% in extensive regions, particularly around continental boundaries. Phase differences of more than 1 (0.5) months for the annual (semiannual) harmonics are also apparent. Larger differences near coastal regions can be related to enhanced GRACE data uncertainties and also to the absence of gravitational attraction and loading effects in ECCO. Improvements in both data and model‐based estimates are still needed to narrow present uncertainties in pb estimates.

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Dynamics of seasonal and interannual variability of the ocean bottom pressure in the Southern Ocean

Cited by 3 publications

References 36 publications

Interbasin Differences in Interannual Variations of the Antarctic Circumpolar Current Transport

Interbasin Differences in Interannual Variations of the Antarctic Circumpolar Current Transport

Acceleration of Antarctic Circumpolar Current at the Drake Passage during the GRACE era

How Well Do We Know the Seasonal Cycle in Ocean Bottom Pressure?

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