Internal tidal waves and deep-water renewal in a tropical fjord: Lessons from Ambon Bay, eastern Indonesia

Salamena, Gerry Giliant; Whinney, James; Heron, Scott F.; Ridd, Peter V.

doi:10.1016/j.ecss.2021.107291

Cited by 15 publications

(11 citation statements)

References 52 publications

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“…Deep‐water renewal occurs intermittently, typically when mixing of inflowing ocean water is weak and often varies on a spring‐neap tidal cycle (Farmer and Freeland 1983; Silva and Vargas 2014). Deep‐water renewal, governed by the monsoon and the spring‐neap phase of the internal tide, has been observed in Ambon Bay, Indonesia, a shallow‐silled, tropical fjord (Salamena et al 2021). Analysis of event persistence in Bahía Almirante based on hypoxia thresholds yields timescales that are potentially consistent with fortnightly processes (Supporting Information Fig.…”

Section: Discussionmentioning

confidence: 99%

Seasonal hypoxia and temperature inversions in a tropical bay

Adelson

Altieri

Boza

et al. 2022

Limnology & Oceanography

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Dissolved oxygen (DO) is a critically important ecological variable, and the prevalence of marine hypoxia is expected to increase due to the combined effects of ocean warming and eutrophication. Thermal stress can co‐occur with hypoxia, especially in tropical systems, and can exacerbate its effects. We examine the physical processes that are important in regulating hypoxia and temperature inversions in Bahía Almirante, a semi‐enclosed tropical embayment on the Caribbean coast of Panama. A 10‐yr record of observations at 7 locations within Bahía Almirante reveals seasonal temperature inversions and hypoxia at depth that often co‐occur. These features are more severe and persistent in the back bay, though they occur throughout Bahía Almirante. DO reductions correspond to periods with high freshwater input, including direct precipitation, resulting in strong salinity stratification that isolates bottom waters, allowing biological oxygen demand to draw down DO. Evidence indicates that lateral advection can contribute to reoxygenation events, and the relationship between near bottom DO and bottom salinities in the mid bay and back bay is consistent with deep‐water renewal as the mechanism for bottom water ventilation. These hypoxia and temperature inversion events impact the biological communities of Bahía Almirante, and the physical dynamics that regulate these coincident and persistent stressors for marine organisms are likely present in other shallow, tropical estuaries.

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Section: Discussionmentioning

confidence: 99%

Seasonal hypoxia and temperature inversions in a tropical bay

Adelson

Altieri

Boza

et al. 2022

Limnology & Oceanography

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“…Processes internal to the ocean also play a crucial role in this thermal structure, such as mass transport by currents and eddies (e.g. : Aguedjou et al, 2021), mixing by turbulent diffusion (Kunze et al 2012), tides and internal tidal waves (IT) (Barton et al, 2001;Smith et al, 2016;Salamena et al, 2021). The role of IT on the thermal structure of the ocean is of increasing interest with many studies in recent years, but remains poorly understood in many ocean regions, and especially off the Amazon shelf.…”

Section: Introductionmentioning

confidence: 99%

Internal tides off the Amazon shelf Part I : importance for the structuring of ocean temperature during two contrasted seasons

Assene

Koch-Larrouy

Dadou

et al. 2023

Preprint

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Abstract. Tides and internal tides (IT) in the ocean can significantly affect local to regional ocean temperature, including sea surface temperature (SST), via physical processes such as diffusion (vertical mixing) and advection (vertical and horizontal) of water masses. Offshore of the Amazon River, strong IT have been detected by satellite observations and well modelled ; however, their impact on temperature, SST and the identification of the associated processes have not been studied so far. In this work, we use high resolution (1/36°) numerical simulations with and without the tides from an ocean circulation model (NEMO). This model explicitly resolves the internal tides (IT) and is therefore suitable to assess how they can affect ocean temperature in the studied area. We distinguish the analysis for two contrasted seasons, from April to June (AMJ) and from August to October (ASO), since the seasonal stratification off the Amazon River modulates the IT’s response and their influence in temperature. The generation and the propagation of the IT in the model are in good agreement with observations. The SST reproduced by the simulation including tides is in better agreement with satellite SST data compared to the simulation without tides. During ASO season, stronger meso-scale currents, deeper and weaker pycnocline are observed in contrast to the AMJ season. The observed coastal upwelling during ASO season is better reproduced by the model including tides, whereas the no-tide simulation is too warm by +0.3 °C for the SST. In the subsurface above the thermocline, the tide simulation is cooler by −1.2 °C, and warmer below the thermocline by +1.2 °C compared to the simulation without the tides. The IT induce vertical mixing on their generation site along the shelf break and on their propagation pathways towards the open ocean. This process mainly explains the cooler temperature at the ocean surface and is combined with vertical and horizontal advection to explain the cooling in the subsurface water above the thermocline and a warming in the deeper layers below the thermocline. The surface cooling induced in turn an increase of the net heat flux from the atmosphere to the ocean surface, which could induce significant changes in the local and even for the regional tropical Atlantic atmospheric circulation and precipitation. We therefore demonstrate that IT, via vertical mixing and advection along their propagation pathways, and tides over the continental shelf, can play a role on the temperature structure off the Amazon River mouth, particularly in the coastal cooling enhanced by the IT. Keywords: internal tides, Amazon continental shelf and slope, temperature, modeling, satellite data, mixing, heat flux.

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“…The results of studies related to flying fish distribution have been reported in several locations as follows: Indian Ocean [13], Caribbean Waters [14,15], Russia [16], North Carolina [17], Eastern Indonesia [18], Fakfak [19], Flores Sea [20], Ombai Strait (21), and Seram Sea [22], but the result regarding flying fish distribution in the coastal zone (inshore), near the beach (nearshore) and far from the beach (offshore) has explicitly not reported yet. This study is critical because even though the waters of the island of Ambon have an oceanic character, they have the same water mass, except in certain seasons [23]. On the other hand, it will be instrumental in determining the fishing zone between local fishers and Pattorani to minimize conflicts over the use of flying fish resources in the future by understanding the distribution of the target species of each catch.…”

Section: Introductionmentioning

confidence: 99%

Distribution of flying fish species (Exocoetidae) in the waters of Ambon Island

Tuapetel

Tupan²

2021

E3S Web Conf.

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There are 71 species of flying fish (exocoetidae) in the world, 18 species in Indonesia, and ten species in Maluku. The southern waters of Ambon Island are potential areas for catching flying fish, but the species distribution has not been reported. This study aimed to determine the composition and distribution of flying fish species caught by gillnet in the southern Ambon Island waters. The study of flying fish species was carried out from February to June 2021. There were five dominant flying fish species distributed consistently based on their respective zones. The morphological identification revealed flying fish species which broadcast on the coast of the island respectively, namely: Cypselurus poecilopterus, Cheilopogon abei, Cheilopogon spilopterus with geographical position - 3°73′07″S – -3°92′01″S and 128°15′04″E – 128°44′08″E. The high seas were dominated by Cheilopogon furcatus dan Hirundichthys oxycephalus with position -4°14′08″S – -4°72′16″S and 128°28′05″E – 129°42′09″E. This information could be provided as a database for the management and sustainable use of flying fish resources to support Indonesia's National Fish Reserve or Lumbung Ikan Nasional (LIN).

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Internal tidal waves and deep-water renewal in a tropical fjord: Lessons from Ambon Bay, eastern Indonesia

Cited by 15 publications

References 52 publications

Seasonal hypoxia and temperature inversions in a tropical bay

Seasonal hypoxia and temperature inversions in a tropical bay

Internal tides off the Amazon shelf Part I : importance for the structuring of ocean temperature during two contrasted seasons

Distribution of flying fish species (Exocoetidae) in the waters of Ambon Island

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