The shallow meridional overturning circulation in the northern Indian Ocean and its interannual variability

Hu, Ran; Liu, Qinyu; Wang, Qi; Godfrey, J. S.; Meng, Xin

doi:10.1007/bf02918511

Cited by 9 publications

(2 citation statements)

References 23 publications

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“…To find out the structure of the IO shallow cells, the meridional transport streamfunction was calculated, which is the latitude-depth profile of the zonal-vertical-integrated meridional transport (Hu et al, 2005;Schott et al, 2009). The calculation started with computing the meridional transports at each grid point and then accumulated these transports along the longitude from west-coast to east-coast to obtain zonalintegrated meridional transport.…”

Section: The Meridional Streamfunctionmentioning

confidence: 99%

Variability of the Shallow Overturning Circulation in the Indian Ocean

et al. 2020

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Variability of the Indian Ocean (IO) shallow overturning circulation during 1958–2017 was investigated, which consisted of a cross‐equator cell (CEC) and a southern subtropical cell (SSTC). Structures of these shallow cells were examined through the velocity sections and the transport steamfunction patterns based on the newly released Ocean Reanalysis System 5 data set, and the results showed that the returning flows, at the subsurface, of the shallow cells mainly presented at the western boundary while absented in the ocean interior. Strengths of the IO shallow cells were then determined according to the annual‐mean meridional streamfunction profiles. Both the CEC and the SSTC exhibited significant variability on interannual to decadal timescales during 1958–2017, and this variability mainly resulted from changes in both meridional Ekman transports and meridional geostrophic flows in the upper layer, and each component could dominate the shallow cells' variations in certain years. Contributions of the geostrophic currents to the shallow cells were likely opposite to that of the Ekman transport in the South Indian Ocean during years when the latter reached the extremes. The CEC and the SSTC were negatively correlated during the research period. The CEC exhibited a decadal weakening during 2000–2015, contributing to the decadal increasing of the IO heat content, while the SSTC only experienced very little strengthening. Here this paper presents a comprehensively study of the interannual to decadal variability of the IO shallow cells and the corresponding reasons and influences and tried to link these variations with other variations in the IO.

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Section: The Meridional Streamfunctionmentioning

confidence: 99%

Variability of the Shallow Overturning Circulation in the Indian Ocean

et al. 2020

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“…A signi cant interannual variability in both CEC and STC is also reported by several studies (e.g., Schott et al, 2004, Meng et al, 2020. Ruijin et al, (2005) reported that the interannual variability of the meridional heat transport across the equator and sea surface temperature (SST) in the north Indian Ocean are closely related. Horii et al, (2013) studied seasonal to interannual variability of meridional currents using Acoustic Doppler Current Pro lers (ADCPs) at the central equatorial Indian Ocean (at 0°, 90 o E) for the period 2002-2009.…”

Section: Introductionmentioning

confidence: 56%

The interannual variability of shallow meridional overturning circulation and its association with the south-west Indian Ocean heat content variability

Pai

Parekh

Chowdary

et al. 2022

Theor Appl Climatol

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The present study examines interannual variability of Shallow Meridional Overturning Circulation (SMOC) using century long reanalysis data. The strength of the transport associated with SMOC is calculated by meridional overturning streamfunction. The interannual variability in SMOC is found maximum between the 5 o S and 15 o S and displaying strong signals after 1940s. A year for which the meridional overturning streamfunction detrended anomaly is greater (lesser) its standard deviation is identi ed as strong (weak) SMOC year. For strong (weak) SMOC year composite displayed more (less) southward transport (~2.5 Sv) and shown excess (less) subduction over the South Indian Ocean. During strong (weak) years, the excess (less) southward heat transport (~0.25PW) leads to reduction (increase) in the upper 200m Ocean Heat Content (OHC) and sea level over the Southwest Indian Ocean (SWIO). The results obtained are well supported by tide gauge and satellite measured sea level data for the available period. Further analysis reveals that the SMOC variability is primarily driven by change in zonal wind stress south of the equator and displayed association with the Southern Oscillation Index. The Ocean model-based sensitivity experiments con rms that the OHC variability over SWIO is closely associated with the SMOC variability and is primarily driven by local wind forcing as a response to El Niño Southern Oscillation. However, the role of remote forcing from Paci c through Oceanic pathway over SWIO is absent. Study attempts to provide a comprehensive view on the interannual variability of SMOC and its linkage to OHC variability over SWIO during last century.

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A review of ocean-atmosphere interaction studies in China

Liu

Yang

et al. 2006

Adv. Atmos. Sci.

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The shallow meridional overturning circulation in the northern Indian Ocean and its interannual variability

Cited by 9 publications

References 23 publications

Variability of the Shallow Overturning Circulation in the Indian Ocean

Variability of the Shallow Overturning Circulation in the Indian Ocean

The interannual variability of shallow meridional overturning circulation and its association with the south-west Indian Ocean heat content variability

A review of ocean-atmosphere interaction studies in China

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