Browsing by Author "Ansong, J.K."
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Item Detecting Change in the Indonesian Seas(Frontiers in Marine Science, 2019-06-04) Ansong, J.K.; Sprintall, J.; Gordon, A.L.; Wijffels, S.E.; Feng, M.; Hu, S.; Koch-Larrouy, A.; Phillips, H.; Nugroho, D.; Napitu, A.; Pujiana, K.; Susanto, R.D.; Sloyan, B.; Peña-Molino, B.; Yuan, D.; Riama, N.F.; Siswanto, S.; Kuswardani1, A.; Arifin, Z.; Wahyudi, A.J.; Zhou, H.; Nagai, T.; Bourdalle-Badié, R.; Chanut, J.; Lyard, F.; Arbic, B.K.; Ramdhani, A.; Setiawan, A.The Indonesian seas play a fundamental role in the coupled ocean and climate system with the Indonesian Throughflow (ITF) providing the only tropical pathway connecting the global oceans. Pacific warm pool waters passing through the Indonesian seas are cooled and freshened by strong air-sea fluxes and mixing from internal tides to form a unique water mass that can be tracked across the Indian Ocean basin and beyond. The Indonesian seas lie at the climatological center of the atmospheric deep convection associated with the ascending branch of the Walker Circulation. Regional SST variations cause changes in the surface winds that can shift the center of atmospheric deep convection, subsequently altering the precipitation and ocean circulation patterns within the entire Indo-Pacific region. Recent multi-decadal changes in the wind and buoyancy forcing over the tropical Indo-Pacific have directly affected the vertical profile, strength, and the heat and freshwater transports of the ITF. These changes influence the largescale sea level, SST, precipitation and wind patterns. Observing long-term changes in mass, heat and freshwater within the Indonesian seas is central to understanding the variability and predictability of the global coupled climate system. Although substantial progress has been made over the past decade in measuring and modeling the physical and biogeochemical variability within the Indonesian seas, large uncertainties remain. A comprehensive strategy is needed for measuring the temporal and spatial scales of variability that govern the various water mass transport streams of the ITF, its connectionwith the circulation and heat and freshwater inventories and associated air-sea fluxes of the regional and global oceans. This white paper puts forward the design of an observational array using multi-platforms combined with high-resolution models aimed at increasing our quantitative understanding of water mass transformation rates and advection within the Indonesian seas and their impacts on the air-sea climate system.Item Geographical Distribution of Diurnal and Semidiurnal Parametric Subharmonic Instability in a Global Ocean Circulation Model(Journal of Physical Oceanography, 2018-06) Ansong, J.K.; Arbic, B.K.; Simmons, H.L.; Alford, M.H.; Buijsman, M.C.; Timko, P.G.; Richman, J.G.; Shriver, J.F.; Wallcraft, A.J.The evidence for, baroclinic energetics of, and geographic distribution of parametric subharmonic instability (PSI) arising from both diurnal and semidiurnal tides in a global ocean general circulation model is investigated using 1/12.5° and 1/25° simulations that are forced by both atmospheric analysis fields and the astronomical tidal potential. The paper examines whether PSI occurs in the model, and whether it accounts for a significant fraction of the tidal baroclinic energy loss. Using energy transfer calculations and bispectral analyses, evidence is found for PSI around the critical latitudes of the tides. The intensity of both diurnal and semidiurnal PSI in the simulations is greatest in the upper ocean, consistent with previous results from idealized simulations, and quickly drops off about 5° from the critical latitudes. The sign of energy transfer depends on location; the transfer is positive (from the tides to subharmonic waves) in some locations and negative in others. The net globally integrated energy transfer is positive in all simulations and is 0.5%–10% of the amount of energy required to close the baroclinic energy budget in the model. The net amount of energy transfer is about an order of magnitude larger in the 1/25° semidiurnal simulation than the 1/12.5° one, implying the dependence of the rate of energy transfer on model resolution.Item Job satisfaction among career record personnel in the Ghana civil service: a case study(Emerald Publishing Limited, 2022) Ansong, J.K.; Darko-Adjei, N.Purpose – Good records management and effective employees contribute greatly to the success of every organization. Like any other employees, records personnel need to be satisfied with their jobs so they are motivated. Unfortunately, records personnel in Ghana are faced with many challenges which negatively affect their job satisfaction. This study aims to examine the issue of job satisfaction among career records personnel in the Civil Service of Ghana. Design/methodology/approach – Civil servants from 27 ministries and the Public Records and Archives Administration Department (PRAAD) were selected for the study. A survey questionnaire was the main data collection instrument used to gather data on selected variables from respondents. The questionnaire was answered by 115 out of 208 respondents: a response rate of 74.5%. Findings – Institutional policy, supervision quality, co-worker relations quality, promotions opportunities, salary levels, benefits availability, the nature of the work itself and reward availability all had a significant and positive relationship with job satisfaction. Originality/value – The case study findings can be used to inform a working document to help other public sector organizations in policy making regarding conditions of service. It is also directly beneficial to the Ghana Office of the Head of Civil Service and policymakers because the findings will help them to reshape their employment policies to positively affect job satisfaction of members in its records class.Item Job Satisfaction Among Career Records Personnel in the Civil Service of Ghana(University of Ghana, 2018-07) Ansong, J.K.Every organization depends on records to perform its activities and these records are managed by records personnel. Records personnel, like other employees, need to be satisfied with their jobs or there would be no motivation to work hard. In turn, hardworking employees contribute greatly to the success of every organization. The aim of this study was to examine the issue of job satisfaction among career records personnel in the Civil Service of Ghana. Civil Servants from twenty-seven (27) ministries and PRAAD were selected for the study. The survey method was used in the study and questionnaire was the main data collection instrument used. Out of the 208 targeted respondents, 155 responded to the questionnaire, giving a response rate of 74.5%. The findings indicated that institutional policy, supervision, co-worker relations, promotion, salary, benefits and actual work had a significant and a positive relationship with job satisfaction, but communication had no significant relationship with job satisfaction. Majority of records personnel were less satisfied with some aspects of bureaucracy, salary and benefits in the Civil Service. The researcher recommends the reduction of chain of command in the Civil Service to speed up task performance in order to achieve high productivity. In addition, the study recommends that allowances and benefits should be provided for the Records Class to augment their salaries in order to motivate employees to work hard. Finally, more opportunities should be provided for professionals within the Civil Service to upgrade their knowledge and skills for high productivity, ultimately leading to promotion.Item A WAVEWATCH III® model approach to investigating ocean wave source terms for West Africa: Non-linear wave-wave interaction source terms(Applied Ocean Research, 2022) Foli, B.A.K.; Ansong, J.K.; Addo, K.A.; Wiafe, G.Ocean wave forecasting for West Africa has mostly relied on global parameterization schemes and data outputs. Investigating non-linear ocean wave-wave interaction source terms (Snl) for the region that forms part of the wave model parameterization schemes, is a contribution of this study towards developing a regional wave modelling scheme for West Africa. The study evaluates five non-linear source-term configurations with the WAVEWATCH III® (WW3) numerical ocean wave model version 5.16; (i) No source term applied (NL0); (ii) Discrete Interaction Approximation (DIA): NL1, (iii) Exact Interaction Approximation: NL2, (iv) Generalized Multiple DIA (NL3) and (v) Two-Scale Approximation (NL4) in order to determine best-performing Snl for projecting significant wave heights and directions for the region. The wave simulations were run on three separate grids comprising a low-resolution West Africa grid (latitudes 10° S–30° N; longitudes 35° W–15° E), high-resolution south-eastern (latitudes 2o S – 8o N; longitudes 10o W – 10o E) and north-western (latitudes 10o N) – 25o N; longitudes 30o W – 10o W) sub-grids. Simulations for the entire West Africa grid produced higher accuracy for the wave parameters compared to the higher-resolution sub-grids. NL0 best estimates are significant wave height, whereas NL3 best estimates wave directions for the West Africa grid. For combined stations of the south-eastern sub-grid, while NL1 best estimates wave heights, NL3 best estimates the wave directions with possible alternation with NL1 due to insignificant differences. Similarly, for the north-western sub-grid, while NL1 best estimates significant wave heights; NL0 best estimates wave directions with similar ability to alternate with NL2 in projecting wave directions. Generally, insignificant differences exist between the source terms in projecting wave directions, especially for the north-western sub-region, implying that any of the source terms may be used in projecting wave directions without significantly compromising on accuracy. Thus, NL1, which best estimates significant wave heights for both the south-eastern and north-western sub-regions can also be used in estimating the wave directions. Similarly, NL0 would be appropriate for the entire West African region