scholarly journals Seismic Property and Its Effect on Abrasion in the West Leihitu Coastal region, Ambon Island

2020 ◽  
Vol 1463 ◽  
pp. 012032
Author(s):  
R R Lokollo ◽  
J R Kelibulin ◽  
A Z Wattimena
Keyword(s):  
Coastal Region ◽  
The West ◽  
Seismic Property

A Model of Seawater Structure Near the West Coast of Vancouver Island, British Columbia

1963 ◽  
Vol 20 (4) ◽  
pp. 939-967 ◽  
Author(s):  
Robert K. Lane
Keyword(s):  
British Columbia ◽  
West Coast ◽  
Large Scale ◽  
Coastal Region ◽  
Vancouver Island ◽  
Structural Elements ◽  
The West ◽  
Characteristic Structure ◽  
Oceanographic Data ◽  
Vertical Sections

Oceanographic data collected in a line of stations extending seaward of the west coast of Vancouver Island, British Columbia, were reviewed and analyzed. On the basis of these data and the large-scale meteorological processes of wind, insolation, and precipitation, the characteristic structure of temperature and salinity in the coastal region was denned in five temporal stages throughout the year. These stages are presented as vertical sections along the line with characteristic ranges of values to be found in each of the structural elements.

scholarly journals Meandering Subtropical Jet and Precipitation over Summertime East Asia and the Northwestern Pacific

2017 ◽  
Vol 74 (4) ◽  
pp. 1233-1247 ◽  
Author(s):  
Takeshi Horinouchi ◽  
Ayumu Hayashi
Keyword(s):  
Coastal Region ◽  
Northwestern Pacific ◽  
The West ◽  
Subtropical Jet ◽  
Low Level Jets ◽  
Upper Level ◽  
Quasigeostrophic Model ◽  
The Relationship ◽  
Q Vector ◽  
Precipitation Enhancement

Abstract It has been revealed that in summertime, precipitation is enhanced to the south of the upper-level tropopausal potential vorticity contours, which are accompanied by instantaneous jets, over the eastern coastal region of China to the northwestern Pacific. It is frequently exhibited as precipitation bands ranging in size from over a thousand to several thousands of kilometers long. In this study, an analysis was conducted to quantify the relationship depending on the phase of upper-level disturbances. With composite analysis, it is shown that the enhancement along the contours occurs at all phases; it occurs not only to the east but also to the west of the upper-level troughs, although it is weaker. The midtropospheric distributions of upwelling and the Q-vector convergence are collocated with the precipitation enhancement, suggesting the importance of dynamical induction by geostrophic flow at all phases. The effects of upper-level disturbances and low-level jets (LLJs) with a southerly component are investigated by using an idealized nondimensional quasigeostrophic model supporting latent heating. While upper-level waves induce upwelling and downwelling to the east and west, respectively, of the upper-level troughs, LLJs tend to offset the downwelling, enabling precipitation to the west too. Both in the observational composite and the idealized model with LLJ, confluence and diffluence contribute to the Q-vector convergence to induce upwelling along the subtropical jet irrespective of upper-level disturbance phases. This induction is explained as a general feature of a veered jet where geopotential isolines rotate clockwise with height without requiring wind variation along the jet.

scholarly journals Interpretation of the west segment of the coastal fault zone in the coastal region of South China based on the gravity data

2018 ◽  
Vol 9 (2) ◽  
pp. 142-150 ◽  
Author(s):  
Lisi Bi ◽  
Zhenhuan Ren ◽  
Xiuwei Ye ◽  
Tianyou Liu ◽  
Jihua Qiao
Keyword(s):  
Fault Zone ◽  
South China ◽  
Gravity Data ◽  
Coastal Region ◽  
The West

Variability and Evolution of African Easterly Wave Structures and Their Relationship with Tropical Cyclogenesis over the Eastern Atlantic

2015 ◽  
Vol 143 (12) ◽  
pp. 4975-4995 ◽  
Author(s):  
Alan Brammer ◽  
Chris D. Thorncroft
Keyword(s):  
Coastal Region ◽  
Lower Troposphere ◽  
Absolute Number ◽  
West African ◽  
Tropical Cyclogenesis ◽  
African Easterly Waves ◽  
The West ◽  
Easterly Waves ◽  
West African Coast ◽  
African Coast

Abstract African easterly waves (AEWs) are objectively tracked between West Africa and the tropical Atlantic based on the CFSRv2 data for 1979 to 2012. The characteristics of the troughs of the AEWs at the West African coast are explored and related to whether they favor tropical cyclogenesis over the eastern Atlantic. A logistic regression model was used to determine the optimum combination of predictors that relate AEW characteristics to tropical cyclogenesis. The most skillful model for genesis over the eastern Atlantic consisted of four variables of the AEWs dynamics over the coastal region and the absolute number of days from the peak in the AEW season. Using this diagnostic an equal number of favorable developing and nondeveloping waves were compared through a composite difference analysis. Favorable developing waves had significantly higher moisture content in the lower troposphere to the northwest of the trough as they exited the West African coast compared to favorable nondeveloping waves. Trajectory analysis for all the waves revealed that as the AEWs transition over the West African coast the troughs are typically open to the environment ahead and to the northwest of the trough. For developing waves this means that moist air is ingested into the lower levels of the system, while for nondeveloping waves dry air is ingested. At this point in the AEW life cycle this difference may be fundamental in determining whether a favorable wave can develop or not.

Colored Rain on the West Coastal Region of India: Was it Due to a Dust Storm?

2004 ◽  
Vol 38 (1) ◽  
pp. 24-26 ◽  
Author(s):  
M. Satyanarayana ◽  
S. Veerabuthiran ◽  
D. Ramakrishna Rao ◽  
B. Presennakumar
Keyword(s):  
Dust Storm ◽  
Coastal Region ◽  
The West

scholarly journals The strongholds of Russian coastal borderlands: economic dynamics amid geopolitical turbulence

Baltic Region ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 89-104
Author(s):  
A. G. Druzhinin
Keyword(s):  
World Ocean ◽  
Coastal Region ◽  
Government Support ◽  
Economic Systems ◽  
Settlement System ◽  
Economic Diversification ◽  
The West ◽  
Economic Dynamics ◽  
Key Factor ◽  
The Russian Federation

In the 21st century, the World Ocean is becoming a key factor in global socio-economic dynamics and a geoeconomic and geopolitical priority of many countries. The Russian Federation, whose economy, infrastructure, and settlement system have been gravitating towards the sea since the late 1990s, is no exception. This article aims to identify and provide a conceptual framework for the phenomenon of Russia’s coastal borderlands and their constituent ‘strongholds’. It also explores the factors and features of the economic dynamics of the coastal borderlands amid the post-2014 geopolitical turbulence. Economic and statistical methods are used to highlight the irregularity of the economic and settlement patterns across Russia’s coastal borderlands, in their water and land areas. It is shown that Russian economic and military activities have clustered there to create 14 ‘strongholds’, including two emerging ones. The current confrontation between Russia and the West is accompanied by the country’s growing maritime presence, particularly in its western borderlands, the revitalisation and expansion of its ‘strongholds’, and economic diversification. The economic systems of the country’s leading coastal region have proven to be highly resistant to geopolitical turbulence; this is partly explained by government support.

scholarly journals Analyzing the Tragedy of Illegal Fishing on the West African Coastal Region

2019 ◽  
Vol 9 (1) ◽  
pp. 1-15
Author(s):  
E. C. Merem ◽  
Y. Twumasi ◽  
J. Wesley ◽  
M. Alsarari ◽  
S. Fageir ◽  
...  
Keyword(s):  
Coastal Region ◽  
West African ◽  
The West ◽  
Illegal Fishing

scholarly journals PROBING THE NATURE AND CHARACTERISTICS OF ACTIVE MUD VOLCANIC CLUSTERS IN MAKRAN COASTAL ZONE, PAKISTAN

2020 ◽  
Vol 8 (3) ◽  
pp. 214-222
Author(s):  
Waseem Khan ◽  
Mahnoor Mirwani
Keyword(s):  
Subduction Zone ◽  
Continental Margin ◽  
Late Cretaceous ◽  
Coastal Region ◽  
Strike Slip ◽  
Mud Volcanoes ◽  
The West ◽  
Makran Subduction Zone ◽  
Sedimentary Environments ◽  
Lut Block

Makran Subduction Zone is formed in Late Cretaceous. It is divided into Eastern Makran at the southern edge of Helmand Block in Pakistan and the Western Makran at the southern edge of Lut Block in Iran. The velocity of convergence in Eastern and Western Makran are 42.0 mm/yr and 35.6 mm/yr repectively. Both segments are bound by strike-slip faults e.g. Ornach-Nal left lateral fault in the east and Minab right lateral in the west. Stratigraphically, the zone comprises Formations of ages ranging from Cretaceous to Holocene. In the Eastern Makran, most of the mud volcanoes are located along strike which include Awaran and Sipai-sing, Chandragup, Gwadar, Jabel-e-Gurab, Khandawari, Kund Malir, Ormara and Offshore mud volcanoes. The continental margin of Makran is an ideal environment of Oxygen Maximum Zone which receives organic rich matters in its sediments by marine organisms. Several assisting factors play significant roles in erupting the fluid and methane gasses through the mud vents in Makran Coastal Region such as tectonic stresses, oil, saltwater, and transmitting freshwater in the sedimentary environments.

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