Evolution and impact of the 2016 negative Indian Ocean Dipole

Iskandar, Iskhaq; Lestari, Deni Okta; Utari, Putri Adia; Supardi, .; Rozirwan, Rozirwan; Khakim, Mokhamad Yusup Nur; Poerwono, Pradanto; Setiabudidaya, Dedi

doi:10.1088/1742-6596/985/1/012017

Cited by 11 publications

(10 citation statements)

References 7 publications

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“…Previous studies have shown that during boreal summer/fall of 2015 and 2016, there were two contrasting IOD events took place in the tropical Indian Ocean (Utari et al, 2018;Deni Okta Lestari et al, 2018;Liu et al, 2017;Iskandar et al, 2018;Lu et al, 2018). Note that the 2015 positive IOD event was relatively weak as the tropical Indian Ocean experienced an impact from the unique central Pacific warming associated with the strong central Pacific El Niño in 2015 (Liu et al, 2017;Brainard et al, 2018;Xue & Kumar, 2017).…”

Section: Interannual Variationmentioning

confidence: 92%

“…While positive IOD events took place in the tropical Indian Ocean in 2015 (Liu et al, 2017;D.O. Lestari et al, 2018;, strong negative IOD event was observed in 2016 (Iskandar et al, 2018;Lu et al, 2018). Both positive and negative IOD events typically developed in late boreal spring, matured in boreal summer, and terminated in boreal fall.…”

Section: Journal Of Sustainabilitymentioning

confidence: 97%

See 1 more Smart Citation

Surface Chlorophyll-a Variations Along the Southern Coast of Java During Two Contrasting Indian Ocean Dipole Events: 2015 and 2016

Kurniawati¹,

Sari²,

Setiawan³

et al. 2021

JSSM

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Section: Interannual Variationmentioning

confidence: 92%

Section: Journal Of Sustainabilitymentioning

confidence: 97%

Surface Chlorophyll-a Variations Along the Southern Coast of Java During Two Contrasting Indian Ocean Dipole Events: 2015 and 2016

Kurniawati¹,

Sari²,

Setiawan³

et al. 2021

JSSM

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“…During 2015/16, the TPO witnessed a super El Niño [4,10], which terminated at the end of boreal spring 2016 [11,12]. Following the termination of super El Niño, however, the TPO did not experience a strong La Niña Modoki event as it did in 1998 just after an extreme El Niño in 1997.…”

Section: Comparison With 1998/99 La Niña Modoki Eventmentioning

confidence: 97%

“…It also can be seen that the tropical Indian Ocean (TIO) also witnessed strong negative Indian Ocean Dipole (IOD), both in 1998 and 2016 [12]. A strong negative IOD triggered strong convective process over the Indonesian region causing heavy rainfall in this region.…”

Section: Comparison With 1998/99 La Niña Modoki Eventmentioning

confidence: 99%

Impact of 2016 Weak La Niña Modoki Event Over the Indonesian Region

Lestari¹

2019

GEOMATE

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After an extreme 2015/16 El Niño phenomenon, the Pacific Ocean witnessed a La Niña Modoki event, while a strong negative IOD simultaneously took place in the Indian Ocean. The event was weaker in intensity and shorter in time, compared to the similar case in 1998/99. Using the combined monthly sea surface temperature (SST) derived from the Optimum Interpolation Sea Surface Temperature (OISST) version 2, the atmospheric reanalysis data from the National Center for Environmental Prediction and the National Center for Atmospheric Research (NCEP/NCAR) and the precipitation data from the Tropical Rainfall Measuring Mission (TRMM), the dynamics and possible impact of this event were investigated. The 2016 La Niña Modoki initially developed in boreal summer, subsequently matured in autumn, and abruptly terminated in winter. This short-lived La Niña Modoki was associated with a unique SST anomalies pattern in the Indo-Pacific region. Strengthened easterly winds in the central tropical Pacific Ocean was associated with a warming SST over the western Pacific Ocean and triggered convergence in the lower atmosphere causing upward motion and enhanced convective process over the Indonesian region. As a consequent, most of the Indonesian region experienced excess precipitation during boreal summer, except in the northern part of the Sumatra Island.

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“…Figure 3 shows a strong southwestward current during November 2016 that overwhelmed the dominant northeastward currents. Previous studies have demonstrated that an extremely negative IOD occurred in 2016 (Dong & McPhaden, 2017;Iskandar et al, 2018;Lu et al, 2018). Considering that the interannual variations would generate large current anomalies (discussed in more detail below), we excluded the strong southwestward current in November 2016 from our statistical analysis.…”

Section: Journal Of Geophysical Research: Oceansmentioning

confidence: 99%

Moored Observations of the Savu Strait Currents in the Indonesian Seas

Wang

Yuan

et al. 2020

JGR Oceans

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The currents in the Savu Strait are observed using a subsurface mooring from November 2016 to September 2017. The mean volume transport of the Savu Strait into the Indian Ocean is estimated to be 3.0 Sv (1 Sv = 106 m3/s), with a standard deviation of 14.3 Sv. The vertical profile of the mean currents features a sandwich structure, with southwestward currents into the Indian Ocean in the upper 280 m and lower 700 m and weak northeastward currents in between. The analyses suggest that the currents flow into the Savu Sea from the west (through the Sumba and Savu Straits) and northeast (through the Ombai Strait) between 280 and 700 m, which suggests southward transport toward the Indian Ocean only in the unmeasured Dao Strait based on the conservation of mass inside the Savu Sea. These results underline the importance of circulation in the Savu Sea in the exchange between the Indonesian seas and the Indian Ocean. A linear continuously stratified model and high‐resolution regional INDESO model are used to investigate the variability and dynamics of the Savu Strait current. The existence of the northeastward current in the middle layer suggests the important role of baroclinic mode processes. Simulations also suggests that current in the Savu Strait is forced remotely by the zonal winds over the equatorial Indian Ocean, which propagate eastward along the coasts of the Nusa Tenggara island chain as coastal Kelvin waves.

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Evolution and impact of the 2016 negative Indian Ocean Dipole

Cited by 11 publications

References 7 publications

Surface Chlorophyll-a Variations Along the Southern Coast of Java During Two Contrasting Indian Ocean Dipole Events: 2015 and 2016

Surface Chlorophyll-a Variations Along the Southern Coast of Java During Two Contrasting Indian Ocean Dipole Events: 2015 and 2016

Impact of 2016 Weak La Niña Modoki Event Over the Indonesian Region

Moored Observations of the Savu Strait Currents in the Indonesian Seas

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