Ekman dynamics variability along the southern coast of Java revealed by satellite data

Wirasatriya, Anindya; Setiawan, Joga Dharma; Sugianto, Denny Nugroho; Rosyadi, Insan Alfi; Haryadi, Haryadi; Winarso, Gathot; Setiawan, Riza Yuliratno; Susanto, R. Dwi

doi:10.1080/01431161.2020.1797215

Cited by 47 publications

(41 citation statements)

References 53 publications

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“…This weak southward current corresponds to the occurrence of coastal upwelling which has been reported by many researchers (e.g. Iskandar et al 2009;Wirasatriya et al 2020). Cyclonic eddy is also detected at the eastern part of the southern coast of Java.…”

Section: Molecular Identification Of Panulirus Penicillatussupporting

confidence: 76%

“…Cyclonic eddy is also detected at the eastern part of the southern coast of Java. This indicates an upwelling occurrence induced by negative Ekman pumping as has been demonstrated by Wirasatriya et al (2020). The alternating current pattern along the southern coast of Java, Bali, and Lombok may cause the genetic similarity of the lobsters distributed in those areas.…”

Section: Molecular Identification Of Panulirus Penicillatussupporting

confidence: 66%

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Phylogeographic and molecular characterization of Pronghorn spiny lobster (Panulirus penicillatus Olivier, 1791) in the Southern Coast of Java and Lombok, Indonesia

et al. 2020

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Abstract. Irwani, Wijayanti DP, Satria AW, Sabdono A. 2020. Phylogeographic and molecular characterization of Pronghorn spiny lobster (Panulirus penicillatus Olivier, 1791) in the Southern Coast of Java and Lombok, Indonesia. Biodiversitas 21: 5691-5697. Panulirus penicillatus is one of the most important lobster species in Central Java. It is one of the most populous species in the southern part of Java and Lombok. However, uncontrolled catching causes a decrease in the population of P. penicillatus. Despite such human threats, information about the taxonomic status of this species is limited. Several previous reports on the taxonomy of this species have always been based on the morphological features that cause ambiguous identification. Therefore, this study aimed to establish the relationships of P. penicillatus in southern parts of the southern part of Java and Lombok by using the molecular technique. Twelve samples were collected from four study areas of the southern coast of the southern part of Java and Lombok and identified using DNA barcoding technique. DNA barcoding technique was used for the first time to identify P. penicillatus in this region. This study demonstrated that all specimens belonged to P. penicillatus. However, one specimen (PPK-06) showed high intraspecies nucleotide divergence that formed a distinct subclade. Therefore, the specimen (PPK-06) could represent a cryptic species within P. penicillatus that needs to be studied further.

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Section: Molecular Identification Of Panulirus Penicillatussupporting

confidence: 76%

Section: Molecular Identification Of Panulirus Penicillatussupporting

confidence: 66%

Phylogeographic and molecular characterization of Pronghorn spiny lobster (Panulirus penicillatus Olivier, 1791) in the Southern Coast of Java and Lombok, Indonesia

et al. 2020

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“…Our finding is similar to a recent paper on skipjack tuna in the Gulf of Bone-Flores Sea (Zainuddin et al 2017) that reported the optimum positive effect of remotely-sensed SSC of 0.2 mg/m 3 on CPUE. Concerning future prediction, the climate variability tends to consider ENSO has a less significant impact on the seasonal Ekman dynamics than IOD in the southern coast of Java (Wirasatriya et al 2020), where the IOD events often lag ENSO by 6-11 months (Xu et al 2021). Nowadays, the model accuracy for IOD prediction is becoming robust by further improving several forecasting models, as reported by Lu et al (2018) and Lim and Hendon (2017).…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies have reported that upwelling in the region is also modulated by interannual variabilities, such as El Niño-Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD) (Susanto et al 2001;Wirasatriya et al 2020;Xu et al 2021). For a simple explanation, during El Niño, the relatively warm surface water in the eastern Indonesian seas moves to the central Pacific Ocean or positive (negative) anomaly of sea surface temperature (SST) in the central Pacific Ocean (the Indonesian seas).…”

mentioning

confidence: 99%

Modeling Mackerel Tuna (Euthynnus affinis) Habitat in Southern Coast of Java: Influence of Seasonal Upwelling and Negative IOD

2021

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We used fishery catch data from Cilacap Fishing Port and Copernicus data set in July 2016-December 2017 to investigate the impacts of Indian Ocean Dipole (IOD) on upwelling and mackerel tuna distribution in the southern coast of Java. This study implemented a Generalized Additive Model (GAM) for habitat prediction of mackerel tuna in the waters. The present study showed that the extreme negative IOD in 2016 caused a weaker southeasterly wind and even a reversal to the northwesterly wind, as seen off Sumatra in September 2016. The situation produced vertically mixed layer thickening and no upwelling during the southeast monsoon event 2016, consequently resulted in warmer temperature and fewer Chlorophyll-a (Chl-a) compared to the southeast monsoon event 2017. The mackerel tuna production significantly dropped in 2016 and rose in 2017, particularly during the upwelling event. The high Habitat Suitability Index (HSI) was found in southern Central Java in July 2017, expanded bigger in August 2017, and decreased in September 2017. During July and August 2016, the high HSI covered only a less area in the region and disappeared in September 2017. The high HSI indicates that the oceanographic factor is consistent with the catch probability of mackerel tuna.

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“…Winds strongly affected the strait's upper layer flow, especially during the boreal summer (southeast monsoon) from April to October, and even to December, in 2006. Strong, easterly, wind-induced upwelling generated lower sea levels along the southern coasts of the Nusa Tenggara island chain during the southeast mon-soon (Wyrtki, 1987;Susanto et al, 2001), creating a stronger north-south pressure gradient and increasing the southward ITF flow (Susanto and Marra, 2005;Iskandar et al, 2009;Ningsih et al, 2013;Siswanto et al, 2020;Wirasatriya et al, 2020). The prolonged anomalous easterly winds extended until December because 2006 was an El Niño year (Niño3.4 positive) and the Indian Ocean Dipole Mode Index was also positive, (Horii et al, 2008;Iskandar et al, 2009), thus inducing more vigorous upwelling along the southern coasts of the island chain and driving a more substantial southward flow (ITF).…”

Section: Wind Currents and Temperature In The Alas Straitmentioning

confidence: 99%

Moored Observations of Current and Temperature in the Alas Strait: Collected for Submarine Tailing Placement, Used for Calculating the Indonesian Throughflow

Susanto¹,

Waworuntu²,

Prayogo³

et al. 2021

Oceanog

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Newly released current velocity and temperature measurements in the Alas Strait collected from November 2005 to February 2007 permit calculation of the mean and variable transport of the Indonesian Throughflow (ITF) in this region. These data were collected by the Environmental Division of the Amman Mineral Nusa Tenggara mining company to serve as a guide for the deep submarine placement of tailings produced by the Batu Hijau open pit copper-gold mine. Ocean currents, temperatures, and winds in the Alas Strait region exhibit intraseasonal and seasonal variability, with modulation at interannual timescales that may be associated with intraseasonal Kelvin waves, the regional southeast monsoon, the El Niño Southern Oscillation, and the Indian Ocean Dipole (IOD). Currents in the Alas Strait were found to flow steadily southward not only during the boreal summer from mid-April to October but also when a prolonged anomalously easterly wind associated with positive IOD extended this flow direction through the end of December 2006. A steady shear between the northward-flowing upper layer and the southward-flowing layer beneath was recorded from November 2005 to early April 2006 and from January to February 2007. The 2006 annual transport was –0.25 Sv toward the Indian Ocean and varied from 0.4 Sv in early April 2006 to –0.75 Sv in August 2006. Hence, Alas Strait transport plays a dual role in the total ITF, increasing it during boreal summer and reducing it during boreal winter. Northward flows tend to carry warmer water from the Indian Ocean to the Flores Sea, while the southward ITF flow carries cooler water to the Indian Ocean. Although the Alas Strait is located next to the Lombok Strait—one of the major ITF exit passages—they have different current and temperature characteristics. For a more complete evaluation of the ITF, the Alas Strait must be included in any future monitoring.

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Ekman dynamics variability along the southern coast of Java revealed by satellite data

Cited by 47 publications

References 53 publications

Phylogeographic and molecular characterization of Pronghorn spiny lobster (Panulirus penicillatus Olivier, 1791) in the Southern Coast of Java and Lombok, Indonesia

Phylogeographic and molecular characterization of Pronghorn spiny lobster (Panulirus penicillatus Olivier, 1791) in the Southern Coast of Java and Lombok, Indonesia

Modeling Mackerel Tuna (Euthynnus affinis) Habitat in Southern Coast of Java: Influence of Seasonal Upwelling and Negative IOD

Moored Observations of Current and Temperature in the Alas Strait: Collected for Submarine Tailing Placement, Used for Calculating the Indonesian Throughflow

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