Articles
Publication Date: 2025
Marine Pollution Bulletin (0025326X)211
The authors regret that the original article contained inaccuracies in the author affiliations and contributions section. The corrected author list and credits are presented above. The CRediT authorship contribution statement is as follows: CRediT authorship contribution statement Hossein Barkhordar: Conceptualization, Writing – original draft, Investigation, Data analysis. Gholamreza Mohammadpour: Review & editing, Validation, Supervision, Software, Methodology, Investigation, Formal analysis, Data curation, Conceptualization. Smaeyl Hassanzadeh: Visualization, Supervision, Project administration, Funding acquisition, Conceptualization.The authors would like to apologise for any inconvenience caused. © 2024 Elsevier Ltd
Publication Date: 2024
Continental Shelf Research (02784343)276
Double diffusion (DD) structures, in two types of diffusive convection (DC) and salt-fingering (SF), occur due to vertical temperature and salinity gradients with different diffusion coefficients. Areas such as the Strait of Hormuz, which has a thermohaline exchange between the Persian Gulf and the Sea of Oman, are suitable places for the formation of DD structures. Based on the results, the formation of DC structure is significant compared to other processes in the west of the Strait of Hormuz in December. Fluctuations in temperature and the growth of DC structure cause mixing and changing the depth of the boundary layer of temperature and salinity in the water. So that in the presence of the DC structure, the decrease in the value of the sound speed (1552 m/s) extends to a depth of 40 m, but the sound speed increases to 1555 m/s at the place where the warm water rises. The results show that the sound transmission loss increases by 5-15 dB in the place of strong DC structure. When the sound frequency increases, the transmission loss caused by the DC structure decreases. But for rays with a small propagation angle, a significant expansion is created in the propagation steps and wavelength of the rays, which increases up to 2 times with the increase in the depth of the sound source. © 2024 Elsevier Ltd
Publication Date: 2024
Bulletin of Geophysics and Oceanography (2785339X)65(1)pp. 123-138
The study investigated wind-driven upwelling along the Makran coasts, utilising wind, temperature, and sea surface current data. Results revealed a seasonal coastal upwelling system along the eastern Makran coasts, primarily influenced by coastline orientation, and impacting sea surface dynamics. Trend analysis of sea surface temperature (SST) data indicated consistently negative, or near-zero, SST variations in the Makran upwelling system, in contrast to adjacent areas. Peak upwelling intensity occurred in May, spanning 62° to 66° E, encompassing over 300 km of Makran coasts. Temperature profile data validated the presence of a seasonal coastal upwelling system along the eastern Makran coasts. The examination of sea surface current components, in the northern Arabian Sea and the Gulf of Oman, highlighted the dominance of the seasonal upwelling system, driven by a decreased geostrophic current in May. In the northern Arabian Sea, the intensified geostrophic current, interacting with the Ekman current, diminished coastal upwelling intensity along the eastern Makran coasts. © 2024-OGS.
Publication Date: 2024
Marine Pollution Bulletin (0025326X)209
Advanced satellite technology and algorithms are making substantial progress in meeting the need for improved environmental monitoring of coastal waterways. Integrating high-resolution satellites with in-situ radiometric equipment is essential for effectively monitoring algal blooms and managing coastal resources. Our work has built a model to examine geographical and temporal fluctuations in chlorophyll-a concentration in Bushehr Bay, Persian Gulf, Iran, using radiometric data and high-resolution remote sensing. In this study, we used twenty-four bio-optical features for analysis. After evaluating and selecting the most important features, we used the top five features to estimate chlorophyll-a concentration using machine learning algorithms. Likewise, the model could effectively investigate our climatology of chlorophyll in the study area. Our findings provide a dependable approach to monitor the environmental effect of chlorophyll-a and enhance water quality and regional management of primary production in coastal waters. This proposed proxy may be implemented in comparable places globally. © 2024 Elsevier Ltd
Publication Date: 2024
European Physical Journal Plus (21905444)139(11)
Formation of a diurnal ocean mixed layer (OML) as one of the nonlinear dynamic processes has been investigated by using large eddy simulation (LES) in previous studies, but the effect of different terms of heat fluxes on the OML has not been discussed separately so far. In this paper, the effect of air–sea interaction on the OML was evaluated by large eddy simulation (LES) in the presence or absence of Langmuir circulation (LC), wave breaking (WB), sensible heat flux (SHF), long wave radiation (LWR), latent heat flux, and insolation or short wave radiation for the first time. We used average climatic parameters for the Arabian Sea during the summer monsoon to define the ideal case of simulation. The area was simulated for 33.5 h, and the results of the first 9.5 h were ignored. The variation of different simulated parameters was investigated during a 24-h period. The results of the present study showed that since the SHF and LWR values were omissible, the effects of these two fluxes on many OMD properties are negligible. We also observed that SHF had a reversible effect because of its positive and negative values during the defined timeframe of the simulation. In addition, the maximum impression of heat fluxes was seen in the presence of evaporation and insolation. However, the evaporation in the absence of LC and WB caused a slight decrease in velocity shear and shear production and an increase in the dissipation rate (approximately double), pressure transport, and TKE transport. Moreover, in the presence of evaporation, the presence or absence of LC and WB did not affect the profile of turbulent heat flux. Evaporation did not change the Stokes production as well. The results of this study show that the effect of solar insolation on OML is significant and even more effective than surface evaporation. It reduced TKE and causes most of the diurnal variation in TKE. Furthermore, significant changes in the TKE profile are controlled by the shear production profile. © The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024.
