Influence of positive and negative Indian Ocean Dipoles on ENSO via the Indonesian Throughflow: Results from sensitivity experiments

Zhou, Qian; Duan, Wansuo; Mu, Mu; Feng, Rong

doi:10.1007/s00376-014-4141-0

Cited by 40 publications

(23 citation statements)

References 32 publications

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“…Major changes in dissipation are predicted for the Indonesian Seas which could potentially affect the Indonesian Throughflow current, a major transporter of heat and freshwater to the Indian Ocean (Sprintall et al, 2009), with implications for ENSO and the Indian Ocean dipole, and hence regional climate variability (e.g., Zhou et al, 2015).…”

Section: Discussionmentioning

confidence: 81%

“…This would affect heat and momentum transfer across the globe, as has been hypothesized to have occurred during the LGM (Green et al, ; Schmittner et al, ) and Eocene (Green & Huber, ). Major changes in dissipation are predicted for the Indonesian Seas which could potentially affect the Indonesian Throughflow current, a major transporter of heat and freshwater to the Indian Ocean (Sprintall et al, ), with implications for ENSO and the Indian Ocean dipole, and hence regional climate variability (e.g., Zhou et al, ).…”

Section: Discussionmentioning

confidence: 99%

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Global Tidal Impacts of Large‐Scale Ice Sheet Collapses

et al. 2017

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Recent studies show that the glaciers draining both the West Antarctic and the Greenland Ice Sheets are experiencing an accelerated ice loss, highlighting the possibility of large‐scale ice sheet retreat and sea level rise in the coming centuries and millennia. These sea level changes would vary spatially and could significantly alter global tides as the latter are highly dependent on bathymetry (or water column thickness under ice shelves) and basin shape. This paper investigates how the principal semidiurnal (M2) tidal amplitudes and energy dissipation respond to the nonuniform sea level changes induced by complete ice sheet collapses. The sea level changes are calculated using gravitationally self‐consistent sea level theory, and the tides are simulated using an established tidal model. Results from the simulations show global and spatially heterogeneous changes in tidal amplitudes. In addition, pronounced changes in tidal energy dissipation occur in both the open ocean and in shelf‐seas, also altering the location of tidal mixing fronts. These changes have the potential to impact ocean mixing, and hence large‐scale currents and climate patterns, and the contribution of shelf‐sea to the global carbon cycle. The new results highlight the importance of considering changes in the tides in predictions of future climate and reconstructions of past climate phases such as the Last Interglacial.

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Section: Discussionmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Global Tidal Impacts of Large‐Scale Ice Sheet Collapses

et al. 2017

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“…For example, within the tropic, the variability in the Indian Ocean sector [e.g. Indian Ocean dipole (IOD); Saji et al 1999] can influence El Niño through both the Indonesian Throughflow and Walker circulation, and the initial conditions of the tropical Atlantic have a stronger impact on the predictability of El Niño (Frauen and Dommenget 2012;Keenlyside et al 2013;Zhou et al 2015). While, outside of the tropic, SST in the North Pacific, South Atlantic, and South Indian Oceans can offer important source of predictability for El Niño (Boschat et al 2013).…”

Section: Discussionmentioning

confidence: 99%

The initial errors that induce a significant “spring predictability barrier” for El Niño events and their implications for target observation: results from an earth system model

Duan

2015

Clim Dyn

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“…As mentioned in section , the IOD can influence the tropical Pacific SST for ENSO via the ITF (Yuan et al, , ; Zhou et al, ). There also exist some studies that emphasized the role of atmospheric bridge connecting the tropical Pacific to the Indian Oceans.…”

Section: The Spb Phenomenon Of El Niño Predictionsmentioning

confidence: 99%

“…Specifically, Yuan et al () showed that the positive IOD elevates the thermocline of the eastern Indian Ocean; then the elevated thermocline generates upwelling Kelvin waves that cross through the ITF and propagate into the eastern tropical Pacific Ocean, which then affect tropical Pacific ENSO. The negative IOD forcing was also shown to influence ENSO through the ITF (Zhou et al, ).…”

Section: Introductionmentioning

confidence: 99%

The Initial Condition Errors Occurring in the Indian Ocean Temperature That Cause “Spring Predictability Barrier” for El Niño in the Pacific Ocean

Zhou

Duan

2019

JGR Oceans

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The Community Earth System Model is used to explore the influences of the initial condition errors in sea temperatures in the Indian Ocean (related initial condition errors) on the uncertainties in the Pacific El Niño predictions. Two categories of Indian Ocean‐related initial condition errors are shown to frequently induce the “spring predictability barrier” for El Niño events. The category‐1 error consists of a positive Indian Ocean Dipole‐like sea temperature pattern over the Indian Ocean while the category‐2 initial condition error has a negative Indian Ocean Dipole‐like sea temperature structure and is nearly opposite to that of the category‐1. Both categories of errors underestimate the Pacific El Niño in terms of its amplitude, although they present different spatial structures and undergo different mechanisms. Specifically, the category‐1 error induces negative errors in El Niño predictions in terms of its amplitude by tropical oceanic channel Indonesian Throughflow while the category‐2 error exerts its impact on El Niño prediction and makes it underestimate through the atmospheric bridge. Both categories of initial condition errors emphasize the sensitivity of El Niño predictions to the initial uncertainties in sea temperatures in the Indian Ocean. They may therefore provide useful information on how initialization in the Indian Ocean can be utilized to improve El Niño predictions.

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Influence of positive and negative Indian Ocean Dipoles on ENSO via the Indonesian Throughflow: Results from sensitivity experiments

Cited by 40 publications

References 32 publications

Global Tidal Impacts of Large‐Scale Ice Sheet Collapses

Global Tidal Impacts of Large‐Scale Ice Sheet Collapses

The initial errors that induce a significant “spring predictability barrier” for El Niño events and their implications for target observation: results from an earth system model

The Initial Condition Errors Occurring in the Indian Ocean Temperature That Cause “Spring Predictability Barrier” for El Niño in the Pacific Ocean

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