Intraseasonal variability of subsurface ocean temperature anomalies in the Indian Ocean during the summer monsoon season

Konda, Gopinadh; Gulakaram, Venkata Sai; Vissa, Naresh Krishna

doi:10.1007/s10236-023-01547-x

Cited by 2 publications

(3 citation statements)

References 79 publications

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“…We find the largest S2S ocean temperature anomalies between depths of 50–150 m, as was also observed by Konda et al. (2023) during the Boreal Summer Intraseasonal Oscillation (BSISO).…”

Section: Discussionsupporting

confidence: 90%

“…The largest subseasonal to seasonal (S2S) upper ocean temperature variability in the equatorial Indian Ocean is observed below the mixed layer between depths of 50–150 m for example, (Konda et al., 2023). The Madden–Julian Oscillation (MJO) partly drives upper ocean temperature variability during the boreal winter through the forcing of equatorial waves (e.g., Boulanger & Menkes, 1995; Cane & Moore, 1981; Cane & Sarachik, 1977; DeMott et al., 2015; Hendon et al., 1998; Matthews et al., 2010; Pujiana & McPhaden, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Processes Driving Subseasonal Variations of Upper Ocean Heat Content in the Equatorial Indian Ocean

Chandra,

Keenlyside,

Svendsen

et al. 2024

JGR Oceans

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In the equatorial Indian Ocean, the largest subseasonal temperature variations in the upper ocean are observed below the mixed layer. Subsurface processes can influence mixed layer temperature and consequently air‐sea coupling. However, the physical processes driving temperature variability at these depths are not well quantified. During the boreal winter, the Madden–Julian Oscillation (MJO) partly drives upper ocean heat content (OHC) variations. Therefore, to understand processes driving subseasonal OHC variability in the equatorial Indian Ocean, we use an observationally constrained, physically consistent ocean state estimate from the Estimating the Circulation and Climate of the Ocean (ECCO) Consortium. Using a heat budget analysis, we show that the main driver of subseasonal OHC variability in the ECCO ocean state estimate is horizontal advection. Along the equator, OHC variations are driven by zonal advection while the role of meridional advection becomes more important away from the equator. During the active phase of the MJO, net air‐sea heat fluxes damp OHC variability along the equator, while away from the equator net air‐sea heat fluxes partly drive OHC variability. Equatorial OHC variations are found to be associated with processes driven by Kelvin and Rossby waves consistent with previous studies. By quantifying the physical processes, we highlight the important role of ocean dynamics in contributing to the observed variations of subseasonal OHC in the equatorial Indian Ocean.

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“…We find the largest S2S ocean temperature anomalies between depths of 50–150 m, as was also observed by Konda et al. (2023) during the Boreal Summer Intraseasonal Oscillation (BSISO).…”

Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Processes Driving Subseasonal Variations of Upper Ocean Heat Content in the Equatorial Indian Ocean

Chandra,

Keenlyside,

Svendsen

et al. 2024

JGR Oceans

View full text Add to dashboard Cite

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“…Zhou & Murtugudde, 2020). For example, Konda et al (2023) found that the enhanced meridional gradient of SST anomalies during the negative IOD favors the coherent northward propagation of summertime intraseasonal oscillations. Previous studies have put forward the potential effects of MJOs on MHWs in the SETIO.…”

Section: Introductionmentioning

confidence: 99%

Impacts of the Madden‐Julian Oscillation on Marginal Sea Heatwaves of the Southeastern Tropical Indian Ocean

Cui,

Li,

Guo

et al. 2024

JGR Oceans

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Marginal seas of the southeastern tropical Indian Ocean (SETIO), including the South Java coasts and the Timor and Arafura Seas, are hotspots of large‐scale marine heatwaves (MHWs) in austral summer with notable impacts on local ecosystems. Yet, the prediction of these MHWs remains challenging. By analyzing 39 MHWs and 45 marine cold‐spells (MCSs) observed in the summers of 1982–2021, this study reveals a robust modulation effect of the Madden‐Julian Oscillation (MJO) on these events. The results show that 56% of MHWs and 51% of MCSs overlapped with MJO events, and their duration is systematically longer than others. Moreover, MHWs in phases 3–4 and MCSs in phases 6–7 of the real‐time multivariate MJO (RMM) index were nearly 2–3 times stronger in intensity than the others. The passage of MJOs drives prominent intraseasonal sea surface temperature (SST) variability in the SETIO through perturbing surface heat fluxes, which in turn modulates the occurrence of MHWs and MCSs. During RMM phases 1–2 (convective center over of the east of Africa or the central‐western Indian Ocean), the SETIO is controlled by a dry condition, with increased surface insolation and suppressed latent heat release. These anomalous fluxes drive a persistent SST increase, facilitating the emergence of strong and prolonged MHWs in the subsequent RMM phases 3–4. Further analysis suggests an 18% probability for MHWs in the SETIO 12 ± 10 days after Phase 1. Therefore, the MJO contributes to the predictability of MHWs/MCSs of the SETIO, with implications for predicting climate extremes and hazards.

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Intraseasonal variability of subsurface ocean temperature anomalies in the Indian Ocean during the summer monsoon season

Cited by 2 publications

References 79 publications

Processes Driving Subseasonal Variations of Upper Ocean Heat Content in the Equatorial Indian Ocean

Processes Driving Subseasonal Variations of Upper Ocean Heat Content in the Equatorial Indian Ocean

Impacts of the Madden‐Julian Oscillation on Marginal Sea Heatwaves of the Southeastern Tropical Indian Ocean

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