scholarly journals Using GMT for 2D and 3D Modeling of the Ryukyu Trench Topography, Pacific Ocean

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Polina Lemenkova
Keyword(s):  
Pacific Ocean ◽  
3D Modeling ◽  
Deep Sea ◽  
Regional Differences ◽  
Western Pacific Ocean ◽  
Technical Approach ◽  
Seafloor Topography ◽  
Ryukyu Trench ◽  
2D And 3D ◽  
The Western Pacific

AbstractThis research focuses on the 2D and 3D geospatial analysis of the Ryukyu Trench, a deep-sea trench located in the western Pacific Ocean between Japan and Taiwan. The aim of the research is to visualize regional differences in the topography of the southern (S) and northern (N) parts of the trench. Technically, the methodology is based on using the Generic Mapping Tools (GMT) scripting toolset, for modelling the General Bathymetric Chart of the Oceans (GEBCO), and Earth Topography and Bathymetry dataset (ETOPO1) raster grids. The results demonstrated topographic differences in the two segments. The most frequent depths lie between -5,000 and -6,000 m. The N part has steeper gradient slopes and deeper bathymetry. Of the depth differences >-6,000 m, S has nine values with depths >-6,800 m while N shows 123 records (max -7,460 m). The submarine terraces of S have gentler slopes compared with the N segment. The technical approach presents GMT-based 2D and 3D cartographic modelling aimed at visualizing regional variations of the seafloor topography.

scholarly journals Brevibacterium profundi sp. nov., isolated from deep-sea sediment of the Western Pacific Ocean

2020 ◽  
Vol 70 (11) ◽  
pp. 5818-5823 ◽  
Author(s):  
Shengxiang Pei ◽  
Fuquan Xie ◽  
Siwen Niu ◽  
Lingqi Ma ◽  
Rui Zhang ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Deep Sea ◽  
Western Pacific ◽  
Diaminopimelic Acid ◽  
Rrna Gene ◽  
Western Pacific Ocean ◽  
Content Type ◽  
Deep Sea Sediment ◽  
Link Type ◽  
The Western Pacific

A new Gram-stain-positive, aerobic, non-motile and rod-shaped actinobacterium, designated O1T, was isolated from a deep-sea sediment of the Western Pacific Ocean. Strain O1T showed optimal growth at 30 °C, between pH 6.0 and 8.0, and in the presence of 1–5 % (w/v) NaCl. The predominant menaquinone was MK-8 (H2), and anteiso-C15 : 0 and anteiso-C17 : 0 were the major fatty acids. The diagnostic diamino acid in the cell-wall peptidoglycan was meso-diaminopimelic acid. The major polar lipids were diphosphatidylglycerol, phosphatidylglycerol and one unknown glycolipid. The DNA G+C content of strain O1T was 64.9 mol% and the genome size was 4.17 Mb. Based on a similarity search and phylogenetic analysis of the 16S rRNA gene sequence, strain O1T belonged to the genus Brevibacterium . The values of average nucleotide identity and in silico DNA–DNA hybridization between strain O1T and its close relatives were well below the thresholds used for the delineation of a new species. On the basis of the morphological and chemotaxonomic characteristics, as well as the genotypic data, it is proposed that strain O1T represents a novel species of the genus Brevibacterium , for which the name Brevibacterium profundi sp. nov. is proposed. The type strain is O1T (=JCM 33845T=MCCC 1A16744T).

Microplastic pollution in deep-sea sediments and organisms of the Western Pacific Ocean

2020 ◽  
Vol 259 ◽  
pp. 113948 ◽  
Author(s):  
Dongdong Zhang ◽  
Xidan Liu ◽  
Wei Huang ◽  
Jingjing Li ◽  
Chunsheng Wang ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Deep Sea ◽  
Western Pacific ◽  
Western Pacific Ocean ◽  
Deep Sea Sediments ◽  
The Western Pacific

scholarly journals New Records and Mitochondrial DNA Markers of Two Deep-sea eels Collected from the Western Pacific Ocean

2021 ◽  
Author(s):  
Han-Jun Kim ◽  
jeonghoon han ◽  
Byung-Jik Kim ◽  
Kyun-Woo Lee ◽  
Kiseong Hyeong ◽  
...  
Keyword(s):  
Mitochondrial Dna ◽  
Pacific Ocean ◽  
16S Rrna ◽  
Dna Markers ◽  
Deep Sea ◽  
New Records ◽  
Western Pacific ◽  
Rrna Gene ◽  
Western Pacific Ocean ◽  
The Western Pacific

Abstract Two deep-sea eels collected from the western Pacific Ocean are described in this study. Based on their morphological characteristics, the two deep-sea eel specimens were assumed to belong to the cusk-eel family Ophidiidae and the cutthroat eel family Synaphobranchidae. To accurately identify the species of the deep-sea eel specimens, we sequenced the mitochondrial genes (cytochrome c oxidase subunit 1 (CO1) and 16S ribosomal RNA (16S rRNA)). Through molecular phylogenetic analysis based on mtDNA CO1 and 16S rRNA gene sequences, these species clustered with the genera Bassozetus and Synaphobranchus, suggesting that the deep-sea eel specimens collected are two species from the genera Bassozetus and Synaphobranchus in the western Pacific Ocean, respectively. This is the first study to report new records of the genera Bassozetus and Synaphobranchus from the western Pacific Ocean based on mitochondrial DNA markers.

scholarly journals Variation Calcium Carbonate Content in Deep-Sea Pelagic Sediments of the Western Pacific Ocean

2010 ◽  
Vol 32 (1) ◽  
pp. 15-22
Author(s):  
Boo-Keun Khim ◽  
Yeo-Hun Kim ◽  
Hyung-Jeek Kim ◽  
Ki-Seong Hyeong ◽  
Chan-Min Yoo
Keyword(s):  
Calcium Carbonate ◽  
Pacific Ocean ◽  
Deep Sea ◽  
Western Pacific ◽  
Carbonate Content ◽  
Western Pacific Ocean ◽  
Calcium Carbonate Content ◽  
The Western Pacific
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