Thermocline Layers Depth and Thickness in Indonesian Waters when Souteast Monsoon

Lana, Andreas Bastian; Kurniawati, Nia; Purba, Noir P.; Syamsuddin, Mega L.

doi:10.20884/1.oa.2017.13.2.70

Cited by 4 publications

(7 citation statements)

References 10 publications

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“…Diantara kedua arus ini terdapat batas yakni sekitar 5 0 N dinamakan North Equatorial Counter Current (NECC) (Toole et al, 1990). Kedalaman perairan relatif dalam yakni sekitar 6000 meter dengan lapisan termoklin sekitar 100-150 meter (Lana et al, 2017). ME terletak disebelah utara North Equatorial Counter-Current (NECC) di sekitar 7 o LU dan 128 o BT (Arruda dan Nof, 2003).…”

Section: Pendahuluanunclassified

Kondisi suhu dan salinitas serta korelasinya dengan variabilitas eddy di Perairan Halmahera dan Mindanao

Suharyo¹,

Purba

Yuliandi³

et al. 2020

Depik

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The purpose of this study was to determine the dynamics of the waters around Halmahera Eddy (HE) and Mindanao Eddy (ME) both horizontally and vertically. The location of the study is in the Pacific Equator Pacific Waters with embedded at 20 - 10oN and 125o-135o E. The data used were temperature and salinity downloaded from Argo Float data centre and combined with surface currents data from MyOcean. The results showed that the two eddies have different impacts on water conditions. In HE, the characteristics are shown by convergent moving mass of water, increasing surface temperature and decreasing salinity. The characteristics of eddy in these waters indicate the existence of downwelling. In ME the mass of water moves divergently, the condition of the sea surface temperature is lower and the salinity level increases. The characteristics of eddy in these waters indicate upwelling.Keywords:EddiesUpwellingIndonesia ThroughflowArgo floatABSTRAKTujuan dari penelitian ini untuk mengetahui dinamika perairan di sekitar Halmahera Eddy (HE) dan Mindanao Eddy (ME) baik secara horizontal dan vertikal. Lokasi kajian berada di Perairan Pasifik Equator Barat dengan koordinat 2o LS – 10o LU dan 125o BT – 135o BT. Data yang digunakan adalah data suhu dan salinitas dari Argo Float dan data arus permukaan dari MyOcean. Hasil penelitian menunjukan bahwa kedua eddy ini memberikan dampak yang berbeda terhadap kondisi perairan. Di HE, karakteristiknya ditunjukkan dengan massa air yang bergerak secara konvergen, meningkatnya suhu di permukaan dan menurunnya kadar salinitas. Karakteristik eddy di perairan ini menunjukkan adanya downwelling. Di ME massa air bergerak secara divergen, kondisi suhu permukaan lautnya lebih rendah dan kadar salinitasnya meningkat. Karakteristik eddy di perairan ini ini menunjukkan adanya upwelling.Kata kunci:EddiesTaikan airArus Lintas IndonesiaArgo float

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Section: Pendahuluanunclassified

Kondisi suhu dan salinitas serta korelasinya dengan variabilitas eddy di Perairan Halmahera dan Mindanao

Suharyo¹,

Purba

Yuliandi³

et al. 2020

Depik

Self Cite

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“…The area embedded from 2 o 00" to 2 o 40" N and 128 o 15" to 128 o 48" E. Bathymetry profile averages 0-1000 meters with deepest depth in east of the island. Around small islands in the southwest of the main island, depth of water less than 200 meters which consist of 0-20 m (shallow waters) (KKP, 2015). The Morotai islands District experiences a rainy and dry season and is highly influenced by tropical monsoon seasons.…”

Section: Geographic Locationsmentioning

confidence: 99%

Development of Morotai Island-North Maluku based on oceanographic-ecosystem condition

Purba¹,

Herawati²,

Dewanti³

et al. 2019

JES

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Morotai Island is developing district located in the North of North Halmahera and one of the areas that has potential source from ecosystem biodiversity. This biodiversity is very unique related to ocean condition such as ocean currents and other properties. This research used survey data in 2015 and other data from satellite and database insitu. The results showed that the Sea Surface Temperature (SST) ranges from 26.7 0 C to 32.8 0 C and the salinity ranges from 33.48 to 36.8 psu characterized by open ocean. The ocean currents patterns different in surrounding area due to variety of depth, tide effect, monsoonal situation, and local aspects. The mangrove area mostly located in the south, while coral reef stands in the almost coastal area. This region is mostly influenced by monsoons and also the Indonesia throughflow. From the results, the location in the southern part is very suitable for marine culture and tourism, while in the northern region it is very suitable for tourism, conservancy, and fishing. These activities will lead Morotai as an important area for enhancing the local revenue.

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“…The Depth of Thermocline (DOT), which is the distance between the upper limit of the thermocline layer and the ocean surface (Lana et al, 2017), is one of the most studied parameters in paleoceanographic studies (Spooner et al, 2005;Ding et al, 2013;Kwiatkowski et al, 2015). The study of the DOT changes is important due to their association with the variation of upwelling intensity and marine productivity (Brasier, 1995;Müller and Opdyke, 2000;Holbourn et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

“…The DOT in the Indonesian region varies spatially with the shallower DOT in its western part and the deeper DOT in its eastern part (Lana et al, 2017). The shallower DOT in western Indonesia is associated with the development of coastal upwelling at the south Sumatra offshore-Lesser Sunda Islands, also known as the Java upwelling region, especially during the Australia-Indonesian winter monsoon (AIWM) (Susanto et al, 2001(Susanto et al, , 2006Andruleit et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…The shallower DOT in western Indonesia is associated with the development of coastal upwelling at the south Sumatra offshore-Lesser Sunda Islands, also known as the Java upwelling region, especially during the Australia-Indonesian winter monsoon (AIWM) (Susanto et al, 2001(Susanto et al, , 2006Andruleit et al, 2008). In eastern Indonesia, the upwelling-related DOT shoaling is hindered by the maximum flow of ITF's surface water, and as a result, the DOT is relatively deeper than in western Indonesia (Gordon and Fine, 1996;Lana et al, 2017). On the glacial-interglacial scale, changes in the DOT are also related to the changes of the Australia-Indonesian monsoon (AIM) configuration and the hydrographic changes The Sumba Island offshore is situated at the confluence of the ITF's exit passage and the Java upwelling region.…”

Section: Introductionmentioning

confidence: 99%

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CHANGES OF THERMOCLINE DEPTH AT THE SUMBA ISLAND OFFSHORE BASED ON PLANKTONIC FORAMINIFERAL ASSEMBLAGES AND ITS IMPLICATION TO EUTROPHICATION SINCE THE LAST DEGLACIATION (~18 ka BP): A PRELIMINARY STUDY

Ardi

Aswan

Maryunani

et al. 2021

MGPB

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Changes of the thermocline depth (DOT) at the Sumba Island offshore are not well-known compared to the DOT changes in the Timor Sea, the main exit passage of the Indonesian Through-flow (ITF). Planktonic foraminiferal assemblages in cores collected from the southwest Sumba offshore (ST08) and Sumba Strait (ST12, ST13, and ST14) were used as a tool to infer the DOT and paleoproductivity changes at the Sumba Island offshore. The DOT changes were indicated from the thermocline and mixed layer dwellers’ relative abundance while the paleoproductivity changes were indicated from the relative abundance of Neogloboquadrina dutertrei. This study suggests a contrast between the DOT pattern at the Sumba Island offshore and the DOT pattern in the Timor Sea during the Last Deglaciation–Holocene. The contrast DOT pattern indicated that the multi-millennial changes of the Australian-Indonesian monsoon (AIM) during the Last Deglaciation– Holocene were the main factors behind the DOT changes in this region while the effects of El Niño Southern Oscillation (ENSO) –like, Indian Ocean Dipole (IOD) –like, and ITF to DOT changes were minimal. Paleoproductivity enhancement at the Sumba Island offshore was not solely related to the monsoon-driven coastal upwelling intensification, which resulted in the DOT shoaling and eutrophic condition. The increase of nutrient availability in surface water due to river runoff increase and changes in the lifted water mass nature were also able to enhance productivity in this region.

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Thermocline Layers Depth and Thickness in Indonesian Waters when Souteast Monsoon

Cited by 4 publications

References 10 publications

Kondisi suhu dan salinitas serta korelasinya dengan variabilitas eddy di Perairan Halmahera dan Mindanao

Kondisi suhu dan salinitas serta korelasinya dengan variabilitas eddy di Perairan Halmahera dan Mindanao

Development of Morotai Island-North Maluku based on oceanographic-ecosystem condition

CHANGES OF THERMOCLINE DEPTH AT THE SUMBA ISLAND OFFSHORE BASED ON PLANKTONIC FORAMINIFERAL ASSEMBLAGES AND ITS IMPLICATION TO EUTROPHICATION SINCE THE LAST DEGLACIATION (~18 ka BP): A PRELIMINARY STUDY

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