Pathways of water between the Pacific and Indian oceans in the Indonesian seas

Nature ◽  
1996 ◽  
Vol 379 (6561) ◽  
pp. 146-149 ◽  
Author(s):  
Arnold L. Gordon ◽  
Rana A. Fine
Keyword(s):  
Indonesian Seas ◽  
The Pacific

Moored Observations of Currents and Water Mass Properties between Talaud and Halmahera Islands at the Entrance of the Indonesian Seas

2021 ◽  
Vol 51 (12) ◽  
pp. 3557-3572
Keyword(s):  
Water Mass ◽  
Low Frequency ◽  
Maximum Velocity ◽  
Boreal Winter ◽  
Indonesian Seas ◽  
Seasonal Movement ◽  
Tropical Water ◽  
The Pacific ◽  
Mass Properties ◽  
Channel Velocity

AbstractThe currents and water mass properties at the Pacific entrance of the Indonesian seas are studied using measurements of three subsurface moorings deployed between the Talaud and Halmahera Islands. The moored current meter data show northeastward mean currents toward the Pacific Ocean in the upper 400 m during the nearly 2-yr mooring period, with the maximum velocity in the northern part of the channel. The mean transport between 60- and 300-m depths is estimated to be 10.1–13.2 Sv (1 Sv ≡ 106 m3 s−1) during 2016–17, when all three moorings have measurements. The variability of the along-channel velocity is dominated by low-frequency signals (periods > 150 days), with northeastward variations in boreal winter and southwestward variations in summer in the superposition of the annual and semiannual harmonics. The current variations evidence the seasonal movement of the Mindanao Current retroflection, which is supported by satellite sea level and ocean color data, showing a cyclonic intrusion into the northern Maluku Sea in boreal winter whereas a leaping path occurs north of the Talaud Islands in summer. During Apri–July, the moored CTDs near 200 m show southwestward currents carrying the salty South Pacific Tropical Water into the Maluku Sea.

The Pacific/Indian Ocean pressure difference and its influence on the Indonesian Seas circulation: Part I—The study with specified total transports

2003 ◽  
Vol 61 (5) ◽  
pp. 577-611 ◽  
Author(s):  
William H. Burnett ◽  
Vladimir M. Kamenkovich ◽  
Arnold L. Gordon ◽  
George L. Mellor
Keyword(s):  
Indian Ocean ◽  
Pressure Difference ◽  
Indonesian Seas ◽  
The Pacific

scholarly journals Moored Observations of Transport and Variability of Halmahera Sea Currents

2020 ◽  
Vol 50 (2) ◽  
pp. 471-488 ◽  
Author(s):  
Xiang Li ◽  
Dongliang Yuan ◽  
Zheng Wang ◽  
Yao Li ◽  
Corry Corvianawatie ◽  
...  
Keyword(s):  
Seasonal Cycle ◽  
Weak Current ◽  
Layer System ◽  
Indonesian Seas ◽  
The Pacific ◽  
Transport Calculation ◽  
Total Transport ◽  
The Pacific Ocean ◽  
The Mean ◽  
Sea Currents

AbstractThe ocean currents in the Halmahera Sea are studied using a subsurface mooring deployed in the Jailolo Strait from November 2015 to October 2017. The subtidal currents of the mooring measurements are characterized by a two-layer system, with the current variability below about 200 m in opposite phases to that in the upper layer. The mean along-strait velocity (ASV) is toward the Indonesian seas in the whole water column, producing an estimated mean transport of 2.44 ± 0.42 Sv (1 Sv ≡ 106 m3 s−1). The errors of the transport calculation based on the single mooring measurements are estimated to be less than 15% using simulations of high-resolution ocean models. A weak current is observed to flow northward during 2017 at the bottom of the strait. The ASV variability is found to be dominated by an annual cycle both in the upper and lower layers. The total transport, however, is dominated by semiannual variability because of the cancelation of the annual transports in the upper and lower layers. The variability of the transport is suggested to be driven by the pressure difference between the Pacific Ocean and the Indonesian seas, as evidenced by the agreement between the satellite pressure gradient and the two-layer transports. The transport of the Jailolo Strait during the 2015/16 super El Niño is found to be nearly the same as that during the 2016 La Niña, suggesting that the interannual variability of the transport is much smaller than the seasonal cycle.

scholarly journals Structure and Variability of Indonesian Throughflow in Labani Canal

Omni-Akuatika ◽  
2019 ◽  
Vol 15 (2) ◽  
pp. 43
Author(s):  
Rizqi Rizaldi Hidayat ◽  
Mukti Trenggono
Keyword(s):  
Large Scale ◽  
Bottom Topography ◽  
Indonesian Seas ◽  
Density Peaks ◽  
Strong Current ◽  
The Pacific ◽  
Through Flow ◽  
The Pacific Ocean ◽  
Mindanao Current ◽  
The Impact

Libani Canal is one of the areas which the flows water masses of the Pacific Ocean toward Indonesian seas. The existence of Mindanao current that affects an input of Indonesian Through-flow should be predicted. The influence of climate change on large scale circulation will affect the variations of physical condition. This study focused to investigate the variation of meridional Libani Current at 30 levels deep based on INDESO models data from January 2007 to January 2014. An area of interested was located at 4.16 °S and 117.92 - 119.42 °E. The results showed a strong current average reaches 0.5 m/s with a north-south orientation as the impact of bottom topography. Variations of current through Fourier analysis showed the annual and inter-annual fluctuations in the 365 days and 120-200 days related impacts strong El-Nino in 2009-2010. Spectrum energy density peaks in the 3 days and 53 days period that indicated as the impact of intra-seasonal variations.

Long‐Term Mean Mass, Heat and Nutrient Flux Through the Indonesian Seas, Based on the Tritium Inventory in the Pacific and Indian Oceans

2019 ◽  
Vol 124 (6) ◽  
pp. 3859-3875 ◽  
Author(s):  
Tengxiang Xie ◽  
Robert Newton ◽  
Peter Schlosser ◽  
Chuanjun Du ◽  
Minhan Dai
Keyword(s):  
Nutrient Flux ◽  
Indonesian Seas ◽  
The Pacific

The Philological Association of The Pacific Coast

PMLA ◽  
1935 ◽  
Vol 50 (4) ◽  
pp. 1373-1374
Keyword(s):  
Annual Meeting ◽  
Pacific Coast ◽  
Stanford University ◽  
The Pacific

The thirty-seventh annual meeting of the Philological Association of the Pacific Coast was held at Stanford University, California, on November 29 and 30, 1935.

A scanning electron microscopic study of the veliger larvae of the scallop argopecten purpuratus

1988 ◽  
Vol 46 ◽  
pp. 284-285
Author(s):  
G.C. Bellolio ◽  
K.S. Lohrmann ◽  
E.M. Dupré
Keyword(s):  
Morphological Description ◽  
Electron Microscopic ◽  
Larval Stages ◽  
Scanning Electron Microscopic Study ◽  
The Pacific ◽  
Argopecten Purpuratus ◽  
Veliger Larvae ◽  
20 Nm ◽  
Ethanol Series ◽  
Scanning Electron

Argopecten purpuratus is a scallop distributed in the Pacific coast of Chile and Peru. Although this species is mass cultured in both countries there is no morphological description available of the development of this bivalve except for few characterizations of some larval stages described for culture purposes. In this work veliger larvae (app. 140 pm length) were examined by the scanning electron microscope (SEM) in order to study some aspects of the organogenesis of this species.Veliger larvae were obtained from hatchery cultures, relaxed with a solution of MgCl2 and killed by slow addition of 21 glutaraldehyde (GA) in seawater (SW). They were fixed in 2% GA in calcium free artificial SW (pH 8.3), rinsed 3 times in calcium free SW, and dehydrated in a graded ethanol series. The larvae were critical point dried and mounted on double scotch tape (DST). To permit internal view, some valves were removed by slightly pressing and lifting the tip of a cactus spine wrapped with DST, The samples were coated with 20 nm gold and examined with a JEOL JSM T-300 operated at 15 KV.

Sign in / Sign up

Export Citation Format

Share Document