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Natuna Off-Shelf Current (NOC) Vertical Variability and Its Relation to ENSO in the North Natuna Sea

ILMU KELAUTAN: Indonesian Journal of Marine Sciences · Vol. 26 No. 2 (2021) · hlm. 63–70

DOI
10.14710/ik.ijms.26.2.63-70
ISSN
2406-7598, 0853-7291
Terbit
2021-05-16
Penerbit
Marine Science Department Diponegoro University
Bahasa
eng
Lisensi
creativecommons.org/licenses/by-sa/4.0

Abstrak

During the northwest monsoon (NWM), southerly flow off the Natuna Islands appeared as the extension of the turning Vietnam coastal jet, known as Natuna off-shelf current (NOC). NOC is generated by the interaction of wind stress and the North Natuna Sea’s bottom topography. The purposes of the present study is to investigate the vertical variability of NOC and its relation to El Niňo Southern Oscillation (ENSO) using Marine Copernicus reanalysis data. The vertical variability refers to the spatial distribution of NOC pattern at the surface layer, thermocline layer, and deep/bottom layer. in 2014 as representative of normal ENSO condition. To investigate the effect of ENSO, the spatial distribution of NOC in 2011 and 2016 were compared which represent the La Niňa and El Niňo conditions, respectively. The results show that NOC starts to generate at the southeast monsoon season to the transition I season and peaks in the northwest monsoon season. The occurrence of NOC is identified at all depth layers with the weakened NOC at the deep layer. Related to the ENSO effect, La Niňa tends to strengthen NOC while El Niňo tends to weaken NOC. These are releted with the strengthening and weakening northerly wind speed during La Niňa and El Niňo, Respectively. During La Niňa events, the NOC occurs more frequently than during El Niňo. Thus, beside affecting the magnitude of NOC, ENSO also influence the frequency occurrence of NOC.

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  • Diponegoro University
  • Cenderawasih University
  • Universitas Gadjah Mada
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Tampilkan sebagai tabel
Rekan penulisOrganisasiArtikel bersama
Parichat WetchayontAfiliasi tidak diketahui5
Muhammad ZainuriDiponegoro University5
OCKY KARNA RADJASAAfiliasi tidak diketahui3
VIVI ENDAR HERAWATIAfiliasi tidak diketahui3
Lilik MaslukahAfiliasi tidak diketahui3
Safwan HadiAfiliasi tidak diketahui3
Nining Sari NingsihAfiliasi tidak diketahui3
Elis IndrayantiAfiliasi tidak diketahui3
Purwanto PurwantoCenderawasih University3
Baskoro RochaddiAfiliasi tidak diketahui3
Aris IsmantoAfiliasi tidak diketahui3
Dwi Haryo IsmunartiAfiliasi tidak diketahui3
Retno HartatiAfiliasi tidak diketahui3
Sugeng WidadaAfiliasi tidak diketahui2
Agus SupangatAfiliasi tidak diketahui2
Diana RachmawatiAfiliasi tidak diketahui2
Ervia YudiatiDiponegoro University2
Mostafa Imhmed IghwerbAfiliasi tidak diketahui2
Rudhi PribadiAfiliasi tidak diketahui2
Riza Yuliratno SetiawanUniversitas Gadjah Mada2
Muhammad HelmiDiponegoro University2
Mulyono S BaskoroAfiliasi tidak diketahui2
Tri Winarni AgustiniAfiliasi tidak diketahui2
Indah WidiyaningsihAfiliasi tidak diketahui2
Ndaru CahyaningtyasAfiliasi tidak diketahui2
Slamet Budi PrayitnoAfiliasi tidak diketahui2
Indra Budi PrasetyawanAfiliasi tidak diketahui2
Rikha WidiaratihAfiliasi tidak diketahui2
Agus IndarjoAfiliasi tidak diketahui2
Sarjito SarjitoAfiliasi tidak diketahui2
Sri Wuli FitriatiAfiliasi tidak diketahui1

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Sumber metadata: OAI-PMH (metadata jurnal) http://ejournal.undip.ac.id/index.php/ijms/oai, pertama di-harvest 8 Nov 2026, terakhir terlihat 8 Nov 2026.
Metadata asli (oai_dc) 
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	<dc:title xml:lang="en-US">Natuna Off-Shelf Current (NOC) Vertical Variability and Its Relation to ENSO in the North Natuna Sea</dc:title>
	<dc:creator>Hariyadi, Hariyadi</dc:creator>
	<dc:creator>Hutabarat, Johannes</dc:creator>
	<dc:creator>Sugianto, Denny Nugroho</dc:creator>
	<dc:creator>Noercholis, Muhammad Faiq Marwa</dc:creator>
	<dc:creator>Prasetyarini, Niken Dwi</dc:creator>
	<dc:creator>Pranowo, Widodo S.</dc:creator>
	<dc:creator>Kunarso, Kunarso</dc:creator>
	<dc:creator>Wetchayount, Parichat</dc:creator>
	<dc:creator>Wirasatriya, Anindya</dc:creator>
	<dc:subject xml:lang="en-US">Natuna off-shelf current; NOC; vertical variability; ENSO; North Natuna Sea</dc:subject>
	<dc:description xml:lang="en-US">During the northwest monsoon (NWM), southerly flow off the Natuna Islands appeared as the extension of the turning Vietnam coastal jet, known as Natuna off-shelf current (NOC). NOC is generated by the interaction of wind stress and the North Natuna Sea’s bottom topography. The purposes of the present study is to investigate the vertical variability of NOC and its relation to El Niňo Southern Oscillation (ENSO) using Marine Copernicus reanalysis data. The vertical variability refers to the spatial distribution of NOC pattern at the surface layer, thermocline layer, and deep/bottom layer.  in 2014 as representative of normal ENSO condition. To investigate the effect of ENSO, the spatial distribution of NOC in 2011 and 2016 were compared which represent the La Niňa and El Niňo conditions, respectively. The results show that NOC starts to generate at the southeast monsoon season to the transition I season and peaks in the northwest monsoon season. The occurrence of NOC is identified at all depth layers with the weakened NOC at the deep layer. Related to the ENSO effect, La Niňa tends to strengthen NOC while El Niňo tends to weaken NOC. These are releted with the strengthening and weakening northerly wind speed during La Niňa and El Niňo, Respectively. During La Niňa events, the NOC occurs more frequently than during El Niňo. Thus, beside affecting the magnitude of NOC, ENSO also influence the frequency occurrence of NOC.</dc:description>
	<dc:publisher xml:lang="en-US">Marine Science Department Diponegoro University</dc:publisher>
	<dc:date>2021-05-16</dc:date>
	<dc:type>info:eu-repo/semantics/article</dc:type>
	<dc:type>info:eu-repo/semantics/publishedVersion</dc:type>
	<dc:type xml:lang="en-US"></dc:type>
	<dc:format>application/pdf</dc:format>
	<dc:identifier>https://ejournal.undip.ac.id/index.php/ijms/article/view/37370</dc:identifier>
	<dc:identifier>10.14710/ik.ijms.26.2.63-70</dc:identifier>
	<dc:source xml:lang="en-US">ILMU KELAUTAN: Indonesian Journal of Marine Sciences; Vol 26, No 2 (2021): Ilmu Kelautan; 63-70</dc:source>
	<dc:source>2406-7598</dc:source>
	<dc:source>0853-7291</dc:source>
	<dc:language>eng</dc:language>
	<dc:relation>https://ejournal.undip.ac.id/index.php/ijms/article/view/37370/pdf</dc:relation>
	<dc:rights xml:lang="en-US">Copyright (c) 2021 ILMU KELAUTAN: Indonesian Journal of Marine Sciences</dc:rights>
	<dc:rights xml:lang="en-US">https://creativecommons.org/licenses/by-sa/4.0</dc:rights>
</oai_dc:dc>