Evolution of 2015/2016 El Niño and its impact on Indonesia

Iskandar, Iskhaq; Utari, Putri Adia; Lestari, Deni Okta; Sari, Qurnia Wulan; Setiabudidaya, Dedi; Khakim, Mokhamad Yusup Nur; Yustian, Indra; Dahlan, Zulkifli

doi:10.1063/1.4987095

Cited by 17 publications

(16 citation statements)

References 6 publications

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“…A coupled ocean-atmosphere mode, namely an El Niño event (cooler waters and higher primary production), took place in the tropical Pacific Ocean during 2012 and 2015-2016, which might have influenced Lombok waters through the Indonesian Throughflow that passes through the Lombok Strait. In 2012, the El Niño occurred in August and September and was categorized as a weak El Niño [23], while in 2015, the El Niño event started to develop from April to May 2015, reached its maximum between November and December 2015, and finished in April-May 2016 [24]. This event had an El Niño index of 3.4 and was classified as a strong event [25], one of the strongest events recorded during the last two decades [24].…”

Section: Discussionmentioning

confidence: 99%

“…In 2012, the El Niño occurred in August and September and was categorized as a weak El Niño [23], while in 2015, the El Niño event started to develop from April to May 2015, reached its maximum between November and December 2015, and finished in April-May 2016 [24]. This event had an El Niño index of 3.4 and was classified as a strong event [25], one of the strongest events recorded during the last two decades [24]. During El Niño events, it is likely that the water movement from Makassar Strait has lower flow [26], thus it could have influenced the upwelling level in the coastal waters of Lombok and Sumbawa waters because cold water with higher productivity in deep water flows to the surface.…”

Section: Discussionmentioning

confidence: 99%

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Catch per Unit Effort Dynamic of Yellowfin Tuna Related to Sea Surface Temperature and Chlorophyll in Southern Indonesia

Wiryawan

Loneragan

Mardhiah

et al. 2020

Fishes

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Tuna fisheries are the most valuable fisheries in the world, with an estimated market value of at least US$42 billion in 2018. Indonesia plays an important role in the global tuna fisheries and has committed to improve its fisheries management; therefore, a pilot of long-term spatial-temporal data bases was developed in 2012, however none have utilized data to have better understanding for management improvement. In this study, the annual and seasonal variation of large (≥10 kg) Yellowfin Tuna (YFT) catch per unit effort (CPUE) have been investigated and the influence of sea surface temperature (SST) and chlorophyll-a on these variables examined. We used fish landing data from West Nusa Tenggara recorded every month between 2012 and 2017 and analyzed using generalized linear models and generalized additive models. We found a seasonal and annual pattern of tuna abundance affected by SST and chlorophyll-a (chl a) and related to upwelling and El Nino event. These results also suggest that a two-month closure to fishing in August and September in southern Lombok is worth considering by the Government to maximize conservation of stocks due to a high abundance of juveniles emerging during the upwelling months from June to August.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Catch per Unit Effort Dynamic of Yellowfin Tuna Related to Sea Surface Temperature and Chlorophyll in Southern Indonesia

Wiryawan

Loneragan

Mardhiah

et al. 2020

Fishes

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“…A remarkable feature was observed in 2015 when a strong El Niño event took place in the tropical Pacific, an anomalous chl-a concentration was observed in the entire GoT and its surrounding region (Figure 4.M1-M7). Note that the peak of chl-a anomaly was observed at the end of development phase of the 2015/2016 El Niño event in September 2015 until the early peak phase of the event in October-November 2015 (Iskandar et al 2017). The chl-a concentration was rapidly reduced in December 2105 before the termination of the 2015/2016 El Niño event.…”

Section: Year-to-year Variationsmentioning

confidence: 93%

Spatial and temporal variability of surface chlorophyll-a in the Gulf of Tomini, Sulawesi, Indonesia

et al. 2018

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Sari QW, Siswanto E, Setiabudidaya D, Yustian I, Iskandar I. 2018. Spatial and temporal variability of surface chlorophyll-a in the Gulf of Tomini, Sulawesi, Indonesia. Biodiversitas 19: 793-801. The Gulf of Tomini (GoT) is mostly influenced by seasonal and interannual events. So, the immensive aim of this study is to explore spatial and temporal variations of chlorophyll-a (chl-a) and oceanographic parameters in the GoT under the influences of monsoonal winds, El Niño Southern Oscillation (ENSO), and Indian Ocean Dipole (IOD). The data were collected from the satellite imaging of chl-a and sea and surface temperature (SST) as well as surface wind from the reanalysis data for a period of January 2003 to December 2015. Monthly variations of the chl-a and SST in the GoT reveal chl-a bloom in the center part to the mouth of the GoT during the southeast monsoon season (boreal summer). The chl-a concentrations were relatively higher (>0.1 mg m-3) and distributed throughout most of the areas near the Maluku Sea. The SST in the middle of the GoT was relatively lower than that near the Maluku Sea (the eastern part of the GoT). On the other hand, during the northwest monsoon (boreal winter), the chl-a concentration decreased (<0.1 mg m-3). During this season, the SST was relatively higher (28-29 °C) than that during the boreal summer (27-26 °C) and distributed uniformly. Meanwhile, on interannual timescale, the ENSO and IOD play important role in regulating chl-a distribution in the GoT. High surface chl-a concentration was observed during El Niño and/or positive IOD events. Enhanced surface chl-a concentration during El Niño and/or positive IOD events was associated with the upward Ekman pumping induced by the southeasterly wind anomalies. The situation was reversed during the Niña and/or negative IOD events.

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“…During 1997 and 2015, the strong El Niño and pIOD events occurred, leading to a significant decrease in precipitation over the Indonesian region including the South Sumatra (Iskandar et al, 2017a). It can be noted that the El Niño and pIOD events in 1997 and 2015 were similar in intensity; however, the number of hotspots in 2015 were more extensive than those in 1997.…”

Section: Resultsmentioning

confidence: 95%

“…In September up to October, hotspots became more extensive in the study area as the humidity and precipitation decreased more significantly. According to Iskandar et al (2017a), a large number of hotspots existed one month prior to the peak of 2015 El Niño. It is important to note that the 2015 pIOD event ended bit earlier than the typical pIOD event.…”

Section: Resultsmentioning

confidence: 99%

Dynamical Link of Peat Fires in South Sumatra and the Climate Modes in the Indo-Pacific Region

Putra

Lestari

Sutriyono

et al. 2019

IJG

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Peat fire is one of the environmental disasters occurring widespread during the dry season in South Sumatra. The region has long been recognized to have extensive peatland, hence it is considered as the vulnerable areas to fire. This study employs spatial analysis to evaluate the likely linked factors causing peat fire in the study area. Two interannual climate modes such as the El Niño – Southern Oscillation and Indian Ocean Dipole were considered to have affected the area with respect to climate anomaly at the 1995-2016 periods. This phenomenon was followed by the peat fire in many areas. There appears a close linkage between the occurrence of peat fires and climate anomaly. A number of hotspots tend to occur annually during the drought season. A significant number of hotspots took place during the 2006 pIOD and 2015 El Niño events due to a significant decrease in rainfall intensities.

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Evolution of 2015/2016 El Niño and its impact on Indonesia

Cited by 17 publications

References 6 publications

Catch per Unit Effort Dynamic of Yellowfin Tuna Related to Sea Surface Temperature and Chlorophyll in Southern Indonesia

Catch per Unit Effort Dynamic of Yellowfin Tuna Related to Sea Surface Temperature and Chlorophyll in Southern Indonesia

Spatial and temporal variability of surface chlorophyll-a in the Gulf of Tomini, Sulawesi, Indonesia

Dynamical Link of Peat Fires in South Sumatra and the Climate Modes in the Indo-Pacific Region

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