Implementation and Validating of the Regional Ocean Model System (ROMS) for the Sunda Strait connecting the Java Sea to the Indian Ocean

2021 ◽  
Author(s):  
Subekti Mujiasih ◽  
Jean-Marie Beckers ◽  
Alexander Barth
Keyword(s):  
Time Series ◽  
Indian Ocean ◽  
Vertical Profile ◽  
Ocean Model ◽  
Model System ◽  
Satellite Sst ◽  
Regional Ocean Model System ◽  
Regional Ocean Model ◽  
The Indian Ocean ◽  
Java Sea

<p>Regional Ocean Model System (ROMS) has been simulated for the Sunda Strait, the Java Sea, and the Indian Ocean. The simulation was undertaken for thirteen months of data period (August 2013 – August 2014). However, we only used four months period for validation, namely September – December 2013. The input data involved the HYbrid Coordinate Ocean Model (HYCOM) ocean model output by considering atmospheric forcing from the European Centre for Medium-Range Weather Forecasts (ECMWF), without and with tides forcing from TPXO and rivers. The output included vertical profile temperature and salinity, sea surface temperature (SST), seas surface height (SSH), zonal (u), and meridional (v) velocity. We compared the model SST to satellite SST in time series, SSH to tides gauges data in time series, the model u and v component velocity to High Frequency (HF) radial velocity. The vertical profile temperature and salinity were compared to Argo float data and XBT. Besides, we validated the amplitude and phase of the ROMS seas surface height to amplitude and phase of the tides-gauges, including four constituents (M2, S2, K1, O1).</p>

Application of HY-2 Satellite SST Data in 4D Variational Assimilation Ocean Forecast Model

2017 ◽  
Vol 8 (2) ◽  
pp. 15-26
Author(s):  
Zhenchang Zhang ◽  
Libin Gao ◽  
Minquan Guo ◽  
Riqing Chen
Keyword(s):  
Time Window ◽  
Forecast Model ◽  
Ocean Model ◽  
Satellite Sst ◽  
Regional Ocean Model System ◽  
Model Research ◽  
Numerical Ocean Model ◽  
Regional Ocean Model ◽  
Taiwan Straits ◽  
Marine Environmental

The 4D variational (4DVAR) assimilation numerical ocean model research is proposed. This model for Taiwan Straits (TWS) is based on Regional Ocean Model System (ROMS). The background of the 4DVAR method is introduced and the development process of assimilation system is presented. In the present research, the model assimilated with Sea Surface Temperature (SST) data of HY-2 satellite (Qi, 2012; Xu, 2013) which is the first marine environmental monitoring satellite of China. In this paper, the model processes from Feb. 1 to Feb. 7, 2014 with one-day assimilation time window and root mean square error (RMSE) reduces averagely by 14.7%.

АПВЕЛЛИНГ НА УЗКОМ ШЕЛЬФЕ ЯПОНСКОГО МОРЯ В 2011 Г., "Фундаментальная и прикладная гидрофизика"

2021 ◽  
pp. 31-42
Author(s):  
А.В. Кошелева ◽  
И.О. Ярощук ◽  
Ф.Ф. Храпченков ◽  
A. A. Pivovarov ◽  
А.Н. Самченко ◽  
...  
Keyword(s):  
Ocean Model ◽  
Model System ◽  
Regional Ocean Model System ◽  
Regional Ocean Model

На основе инструментальных и спутниковых наблюдений рассматриваются характерные особенности локального апвеллинга, наблюдавшегося в октябре 2011 г. в юго-западной части залива Петра Великого Японского моря. Кроме того, приведены результаты численного моделирования, выполнявшегося при помощи Regional Ocean Model System (ROMS) со свободной поверхностью. При вычислениях использовались метеорологические наблюдения за неоднородностями поля ветра и инструментальные измерения гидрологической структуры воды. Анализ данных натурных измерений и их сравнение с результатами моделирования развития апвеллинга выявили, что пространственный и временной масштаб явления определялся силой, продолжительностью и направлением воздействующего ветра. Неоднородность поля скорости ветра, тесно связанная с особенностями береговой орографии, приводит к усилению апвеллинга у некоторых частей побережья и формированию температурных фронтов и струй холодной воды, поперечных основному течению, идущему вдоль шельфа.

scholarly journals Demonstrating the potential of Regional Ocean Model System in simulating the upper ocean characteristic over Arabian Sea: impact of horizontal resolution

2021 ◽  
Author(s):  
Prabha Kushwaha ◽  
Vivek Kumar Pandey
Keyword(s):  
Arabian Sea ◽  
Horizontal Resolution ◽  
Ocean Model ◽  
Model System ◽  
Sea Surface ◽  
Sea Surface Salinity ◽  
Surface Salinity ◽  
Regional Ocean Model System ◽  
Regional Ocean Model ◽  
The Impact

Abstract This study attempted to demonstrate the skill of the regional ocean model system (ROMS) is simulating the hydrographic property of the Arabian Sea (AS). Additionally, the impact of horizontal resolution is investigated. In this regard, ROMS is integrated over AS covering [30˚E-80˚E; 5˚N-30N˚] at two different horizontal resolutions 1/6˚(~ 17km) and 1/4˚(~ 25km) for ten years. The comparison of model results with available observation and reanalysis indicates reasonable resemblances in reproducing the spatial-temporal distribution of surface and subsurface hydrographic property i.e. sea surface temperature (SST), sea surface salinity (SSS), sea surface currents, and subsurface temperature and salinity at both resolutions. The increasing resolution shows minimal improvement, indicating the fact that its not always guaranty to enhance the performance towards increasing resolution for every aspect.

First approach to the application of operational 4DVAR data assimilation to the regional ocean model system

2012 ◽  
pp. 393-396 ◽  
Author(s):  
Marcos Cobas-García ◽  
Andrés Gómez-Tato ◽  
Carmen Cotelo-Queijo ◽  
M Vázquez-Cendón ◽  
Pablo Carracedo-García ◽  
...  
Keyword(s):  
Data Assimilation ◽  
Ocean Model ◽  
Model System ◽  
Regional Ocean Model System ◽  
Regional Ocean Model

scholarly journals A REGIONAL STUDY OF THE BRAZILIAN SHELF/SLOPE CIRCULATION (13◦-31◦S) USING CLIMATOLOGICAL OPEN BOUNDARIES

2013 ◽  
Vol 31 (2) ◽  
pp. 289 ◽  
Author(s):  
Janini Pereira ◽  
Mauro Cirano ◽  
Martinho Marta Almeida ◽  
Fabiola Negreiros Amorim
Keyword(s):  
Ocean Model ◽  
Model System ◽  
Western Boundary ◽  
Data Set ◽  
Western Boundary Currents ◽  
Ocean Climate ◽  
Boundary Currents ◽  
Regional Ocean Model System ◽  
Shelf Slope ◽  
Regional Ocean Model

ABSTRACT. The oceanic features in the eastern and southeastern Brazilian shelf/slope between 13◦-31◦S are investigated using ROMS (Regional Ocean Model System). The model was integrated for 9 years and it was forced with: i) 6-hourly synoptic atmospheric data from NCEP; ii) initial and boundary conditions from OCCAM (Ocean Climate Circulation Advanced Modelling) monthly mean climatology and iii) tidal forcing from TPXO 7.1 global data set. The model results were compared with observations, which consisted in thermodynamic MDL (Mixed Layer Depth) climatology, satellite data, measurements from tide gauges along the shelf and currents measurements values from literature. The simulated currents represented the BC (Brazil Current)-IWBC (Intermediate Western Boundary Current) System. The BC-IWBC system at 22◦S cross-shelf section represents our simulation capability of reproducing the western boundary currents, it showed poleward BC and a opposing IWBC. At this section, the BC velocity core is in 50 m with 0.41 m.s− 1 and the IWBC core around 800 m with 0.15 m.s− 1.   Keywords: Western South Atlantic, ROMS, Western Boundary Currents. RESUMO. A circulação oceânica na região da plataforma/talude do Brasil de 13◦-31◦S é investigada utilizando o modelo ROMS (Regional Ocean Model System). O modelo foi integrado por 9 anos e forçado com: i) dados atmosféricos sinótico a cada 6 horas do NCEP; ii) condições iniciais e laterais provenientes da climatologia mensal do modelo global OCCAM (Ocean Climate Circulation Advanced Modelling) e iii) forçamento de maré do modelo global TPXO 7.1. Os resultados do modelo foram comparados com observações, estas consistem em dados da profundidade da camada de mistura climatológica, dados de satélite, medições de marégrafos ao longo da plataforma e valores de medições de correntes disponíveis na literatura. As correntes simuladas representaram o sistema da CB (Corrente do Brasil)-CCI (Corrente de Contorno Intermediária). O sistema CB-CCI na seção normal a costa em 22◦S representou a capacidade de simulação das correntes de contorno oeste, mostrando a inversão de direção das duas correntes. Nesta seção, o núcleo de velocidade da CB em 50 m apresentou valores de 0,41 m.s− 1 e o núcleo da CCI em 800 m apresentou velocidade de 0,15 m.s− 1.   Palavras-chave: Sudoeste do Atlântico, ROMS, Correntes de Contorno Oeste.  

scholarly journals When economics, strategy, and racial ideology meet: inter-Axis connections in the wartime Indian Ocean

2017 ◽  
Vol 12 (2) ◽  
pp. 228-250 ◽  
Author(s):  
Rotem Kowner
Keyword(s):  
Indian Ocean ◽  
Raw Materials ◽  
Second World War ◽  
Racial Ideology ◽  
World War ◽  
Military Technology ◽  
The Indian Ocean ◽  
Java Sea ◽  
Straits Of Malacca ◽  
Second World

AbstractJapan’s relations with Germany and Italy during the Second World War were rather limited. Nevertheless, there were some regional nuances and growing cooperation as the war drew to its close. In the Indian Ocean, at least, and especially in the area around the Straits of Malacca and the Java Sea, the Japanese and German empires, and to a lesser extent the Italian empire too, did develop a rather intensive cooperation during the final two years of the war (1943–45). This cooperation encompassed several domains, such as the exchange of vital raw materials and military technology, coordinated naval activity, and even an ideological affinity that materialized in pressures to implement harsher racial policies towards Jewish communities in the region. This article examines the scope of this unique inter-Axis collaboration, the specific reasons for why which came into being in this region in particular, and the lessons we may draw from it.

scholarly journals Dynamics of the seasonal variations in the Indian Ocean from TOPEX/POSEIDON sea surface height and an ocean model

1998 ◽  
Vol 25 (11) ◽  
pp. 1915-1918 ◽  
Author(s):  
Jiayan Yang ◽  
Lisan Yu ◽  
Chester J. Koblinsky ◽  
David Adamec
Keyword(s):  
Indian Ocean ◽  
Seasonal Variations ◽  
Sea Surface Height ◽  
Ocean Model ◽  
Sea Surface ◽  
The Indian Ocean

scholarly journals Modeling Decadal Changes on the Indian Ocean Section I5 at 32°S

2007 ◽  
Vol 20 (13) ◽  
pp. 3106-3130 ◽  
Author(s):  
R. J. Murray ◽  
Nathaniel L. Bindoff ◽  
C. J. C. Reason
Keyword(s):  
Indian Ocean ◽  
Ocean Model ◽  
Global Ocean ◽  
Late Winter ◽  
Intermediate Water ◽  
Mode Water ◽  
Density Class ◽  
The Indian Ocean ◽  
1960S And 1970S ◽  
The 1960S

Abstract A near-global ocean model with resolution enhanced in the southern Indian Ocean has been spun up to seasonal equilibrium and then driven by NCEP–NCAR reanalysis 1 monthly mean forcings and Hadley SSTs over the period 1948–2002. The aim was to simulate changes in the subsurface properties observed in hydrographic surveys at 32°S in the Indian Ocean in 1965, 1987, and 2002. These surveys showed a zonally averaged cooling on isopycnals of 0.5° and 0.3°C in mode and intermediate waters between 1965 and 1987 and a warming of the mode water coupled with a continued cooling of the intermediate water between 1987 and 2002. The major changes in isopycnal depth and temperature modeled in this study were confined to the mode water and were qualitatively similar to those observed but concentrated in a lower density class and in the eastern half of the section. The dominant changes here were multidecadal, with maximum temperatures on the σθ = 26.7 kg m−3 isopycnal being reached in 1968 and minimum temperatures in 1990. The simulations showed a propagation of interannual anomalies toward the section from a region of deep late winter mixed layers in the southeast Indian Ocean within a period of several years. Surface temperatures in this region were lowest in the 1960s and highest in the late 1980s. Temperatures on isopycnals showed the opposite variation, consistent with SST having the controlling effect on mixed layer density and depth. Isopycnal depths within the mode water were strongly correlated with temperature, implying a redistribution of mode water density classes, the greatest volume of mode water being produced in a higher density class (σθ = 26.8–27.0 kg m–3) during the period of cooler surface forcing in the 1960s and 1970s than during the warmer period following (σθ = 26.6–26.8 kg m–3).

scholarly journals Features of the Equatorial Intermediate Current Associated with Basin Resonance in the Indian Ocean

2018 ◽  
Vol 48 (6) ◽  
pp. 1333-1347 ◽  
Author(s):  
Ke Huang ◽  
Weiqing Han ◽  
Dongxiao Wang ◽  
Weiqiang Wang ◽  
Qiang Xie ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Equatorial Indian Ocean ◽  
Reanalysis Data ◽  
Ocean Model ◽  
Baroclinic Mode ◽  
Energy Propagation ◽  
Equatorial Wave ◽  
The Indian Ocean ◽  
Phase Propagation ◽  
Equatorial Intermediate Current

AbstractThis paper investigates the features of the Equatorial Intermediate Current (EIC) in the Indian Ocean and its relationship with basin resonance at the semiannual time scale by using in situ observations, reanalysis output, and a continuously stratified linear ocean model (LOM). The observational results show that the EIC is characterized by prominent semiannual variations with velocity reversals and westward phase propagation and that it is strongly influenced by the pronounced second baroclinic mode structure but with identifiable vertical phase propagation. Similar behavior is found in the reanalysis data and LOM results. The simulation of wind-driven equatorial wave dynamics in the LOM reveals that the observed variability of the EIC can be largely explained by the equatorial basin resonance at the semiannual period, when the second baroclinic Rossby wave reflected from the eastern boundary intensifies the directly forced equatorial Kelvin and Rossby waves in the basin interior. The sum of the first 10 modes can reproduce the main features of the EIC. Among these modes, the resonant second baroclinic mode makes the largest contribution, which dominates the vertical structure, semiannual cycle, and westward phase propagation of the EIC. The other 9 modes, however, are also important, and the superposition of the first 10 modes produces downward energy propagation in the equatorial Indian Ocean.

Sign in / Sign up

Export Citation Format

Share Document