A benthic monitor for coastal water dissolved oxygen variation: Mn/Ca ratios in tests of an epifaunal foraminifer

2021 ◽  
Author(s):  
Xiaoyi Guo ◽  
Qinsheng Wei ◽  
Bochao Xu ◽  
William C. Burnett ◽  
Joan M. Bernhard ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Coastal Water

scholarly journals Visualizing Water Quality Sampling-Events in Florida

2015 ◽  
Vol II-4/W2 ◽  
pp. 73-79 ◽  
Author(s):  
M. D. Bolt
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Data Visualization ◽  
Coastal Water ◽  
Environmental Quality ◽  
Additional Data ◽  
Monitoring Program ◽  
Quality Data ◽  
Water Quality Data ◽  
Environmental Narratives

Water quality sampling in Florida is acknowledged to be spatially and temporally variable. The rotational monitoring program that was created to capture data within the state’s thousands of miles of coastline and streams, and millions of acres of lakes, reservoirs, and ponds may be partly responsible for inducing the variability as an artifact. Florida’s new dissolved-oxygen-standard methodology will require more data to calculate a percent saturation. This additional data requirement’s impact can be seen when the new methodology is applied retrospectively to the historical collection. To understand how, where, and when the methodological change could alter the environmental quality narrative of state waters requires addressing induced bias from prior sampling events and behaviors. Here stream and coastal water quality data is explored through several modalities to maximize understanding and communication of the spatiotemporal relationships. Previous methodology and expected-retrospective calculations outside the regulatory framework are found to be significantly different, but dependent on the spatiotemporal perspective. Data visualization is leveraged to demonstrate these differences, their potential impacts on environmental narratives, and to direct further review and analysis.

Nanobubbles Produced by Hydraulic Air Compression Technique

2021 ◽  
Author(s):  
Xiao-Dong Yang ◽  
Qingfeng Yang ◽  
Zhou Limin ◽  
Li-Juan Zhang ◽  
Jun Hu
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Content ◽  
Coastal Water ◽  
Deep Sea ◽  
Low Cost ◽  
Water Remediation ◽  
Nanoparticle Tracking Analysis ◽  
Compression Technique ◽  
Air Compression ◽  
First Time

Abstract The anoxia of coastal water has already been a serious problem all over the word. Nanobubbles are proved to have great applications in water remediation because they could effectively increase the oxygen content and degrade organic matters in water. But the existing methods to produce nanobubbles are complicated and high cost to operate, especially in deep sea. In this paper, we presented a low-cost method, hydraulic air compression (HAC), to produce a large number of nanobubbles and proved that nanoscale gas bubbles could be produced by HAC for the first time. Nanoparticle tracking analysis was used to measure the size and concentration of produced nanobubbles. It indicated that the concentration of nanobubbles would increase as the downpipe height increases. Degassed measurements proved that produced “nanoparticles” are gas nanobubbles indeed. More dissolved oxygen in water would provide the source for larger number of nanobubble formation. Those results are expected to be very helpful for water remediation in ocean in the future.

scholarly journals SPATIAL MODELING FOR MARICULTURE SITE SELECTION BASED ON ECOSYSTEM PARAMETERS AT KUPANG BAY, EAST NUSA TENGGARA INDONESIA

2010 ◽  
Vol 6 (1) ◽  
Author(s):  
Agus Hartoko ◽  
A.L. Kangkan
Keyword(s):  
Dissolved Oxygen ◽  
Coastal Water ◽  
Site Selection ◽  
Spatial Model ◽  
Spatial Interaction ◽  
Total Suspended Solid ◽  
Fish Culture ◽  
Physical Parameters ◽  
Biological Parameters ◽  
Physical Chemical

The aims of the study were : a. to identify the physical, chemical and biological parameters at the utilization zone-coastal water of Kupang Bay, East Nusa Tenggara, b. to analyze the value of coastal water suitability from the physical, chemical and biological parameters for the development for maniculture at the utilization zone of Kupang Bay, East Nusa Tenggara, c. to select the sub zone for the sea weed culture, grouper fish culture site using the system of floating net cage and the culture of pearl oyster. The method used in the study is a spatial approach by conducting the direct measurement of the physical, chemical, and biological parameters. Mapping and spatial model was processed and analyzed through a geo-statistic method. The site selection for mariculture sub-zones were constructed through a spatial scoring and spatial interaction-RGB model and based on matrix of ecosystem parameters suitability score and weighting. With consideration that any numerical, mathematical or spatial model related to the surface of the earth or an ecosystem should take into account the concept of 4D function of its spatian distribution (x,y,z)and temporal consideration (time) such as seasonal data. The result showed that the range values of the physical, chemical, and biological parameters at utilization zone of the Kupang Bay are as follow: 1. Variable of physical parameters were: a). depth 5-25 m, b). transparancy 3.00-11.00 m, c). temperature 26-28.45 degree of celcius, d). salinity 31.50-38.20 ppt, e). substrate consist of: sand, sandy clay, clay sand, silt clay, silt, sand, and coral, f). current velocity 0.059-0.238m per s, and g). total suspended solid 180-305mg per l. 2. Variable of chemical parameters were: a). dissolved oxygen 6.85-8.74 ppm, b). pH 7.97-8.59, c). phosphate is 0.081-0.435mg per l, and d). nitrate 0.145-4.134 mg per l, 3. Variable of biological parameter were: a). abundance of phytoplankton 106,760-210,380 cell per l, and b). chlorophyll-a 0.033-0.037 mg per m. Sub zone for seaweed culture identified mainly almost at all area of the middle of the Kupang Bay width about 7,544 hectares. The most-suitable sub-zone for grouper fish culture was 2,803 hectares wide and width of 1,336 hectare of moderately-suitable. Sub zone for pearl culture exist especially at the north part of Kupang Bay and at some area nearby at the mouth of the Kupang Bay wide about 4.383.8 hectares. The approach with the above concept had proved that with a significance difference of scoring-weight on each specific and important ecosystem parameters for each spatial analysis purposes (i.e.50 percent scoring-weight of nitrate and phosphate for sea weed culture sub zone; 40 percent scoring-weight of dissolved oxygen for fish culture sub zone and 40 percent scoring weight of plankton abudance for oyster pearl culture sub zone), had resulted in a distinctive and specific delineation for each culture sub zones, thus avoiding and less on sub zonal overlapping. Keywords: Ecosystem parameters, Kupang Bay, Mariculture, Spatial model.

scholarly journals ON THE FACTORS AFFECTING THE PRODUCTIVITY OF THE SOUTHERN MAKASSAR STRAIT

2018 ◽  
Vol 21 ◽  
pp. 81-107 ◽  
Author(s):  
Abdul Gani Ilahude
Keyword(s):  
High Temperature ◽  
Dissolved Oxygen ◽  
Coastal Water ◽  
Sea Water ◽  
Monitoring Station ◽  
Low Oxygen ◽  
Low Salinity ◽  
Upwelled Water ◽  
High Silicate ◽  
High Phosphate

An investigation of the upwelling in the Southern Makassar Strait was conducted by LON (Lembaga Oseanologi Nasional) as part of its research program in ecology and oceanography of the Indonesian waters. It consists of observation on one monitoring station and two oceanographical cruises in the region. The result of the monitoring station indicates clearly the occurrence of upwelling and its effect on the hydrology of the region. During the southeast monsoon the upwelled water causes a decrease in temperature and dissolved oxygen and an increase in salinity, density and nitrate-nitrogen, particularly seen at the lower boundary of the homogeneous layer. During the northwest monsoon the upwelled water is replaced by the Jawa Sea water with high temperature, low oxygen, low salinity, low density, very high phosphate, and high silicate. The observation on the oceanographical cruises reveals the precence of two other types of surface waters in the region. They are the East Kalimantan Coastal Water and the South Sulawesi Coastal Water, each is formed by mixing process of sea water and land drainage along the coast of the two islands respectively. Originally they are characterized by low salinity, low oxygen, high temperature, high phosphate, low nitrate and high silicate. Their salinity and dissolved oxygen increase due to mixing with the upwelled water and the high activity of phytoplankton respectively.

scholarly journals Potensi Budidaya Rumput Laut dalam Kaitannya dengan Dampak Perkembangan Pariwisata di Perairan Pantai Kutuh, Badung, Bali

2018 ◽  
Vol 5 (1) ◽  
pp. 94
Author(s):  
Ayu Putu Wiweka Krisna Dewi ◽  
Rani Ekawaty
Keyword(s):  
Dissolved Oxygen ◽  
Coastal Water ◽  
Coastal Waters ◽  
Scientific Information ◽  
Good Condition ◽  
Low Intensity ◽  
Culture Development ◽  
Eucheuma Cottonii ◽  
Seaweed Culture

Seaweed culture is one of the main marine and fishery commodities which mostly still occupied by coastal community in Badung regency. One of the center areas for seaweed culture development is at Kutuh Beach in Kutuh Village South Kuta District, Badung regency . Kutuh Beach also known as Pandawa Beach that have developed become a tourism area. The development of Kutuh beach as tourism area affect the development of existing seaweed culture activities. Therefore,  a study have been done to get scientific information related to the development of seaweed culture in Kutuh coastal water. This research was conducted at in September-October 2016. The data was collected by carrying out measurements directly on the location of seaweed culture of Eucheuma cottonii at Kutuh coastal water. The data collected in this study including the growth of seaweed Eucheuma cottonii and the quality of Kutuh coastal waters, such us nitrat, phosphate, temperature, salinity, pH, and dissolved oxygen (DO). Our study showed that that the quality of Kutuh Pantai waters is still in good condition for the growth of seaweed except Phosphor that can inhibit the growth of seaweed. Instead of phosphor, seaweed can not grow well in the waters of Kutuh Beach because it is eaten by predators and low intensity of sunlight.

scholarly journals Kualitas Perairan di Daerah Fishing Ground Nelayan Kerang di Pesisir Timur Kota Semarang

2017 ◽  
Vol 20 (1) ◽  
pp. 42
Author(s):  
Chrisna Adhi Suryono ◽  
Baskoro Rochaddi
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Water Temperature ◽  
Coastal Water ◽  
Current Velocity ◽  
Marine Organism ◽  
Fishing Ground ◽  
The Relationship ◽  
Anadara Granosa

This study aimed to assess the relationship between marine water qualities in bivalve fishing ground on easter part of Semarang coastal water.  The result of study shows that      the waters quality on those areas is still available for marine organism life. The water quality of dissolved oxygen between 5,6 – 6,2 ppm, water temperature 29,3 – 30,4 oC, salinity 32 – 33,7 ppt, pH 7,1 – 7,8, turbidity  20,2 – 42,5 NTU, and current velocity 0,15 – 0,55 m/sec.  That water quality in the study areas compered with standard water for marinr life is still to suport marine bivalvia to live. Its is proved with some of bivalve found for examples (Anadara granosa A. pilula, A. Gubernaculum, A. Inaequivalvis, Pharella javanica, Paphia undulate, Marcia hiantina, Harvella plicataria, Mactra violacea dan Placuna placenta)  Keywords: Water quality, fishing ground, bivalve  Hasil penelitian menunjukan bahwa kualitas air laut didaerah penelitian masih dikatan layak untuk kehidupan organisme laut.  Konsentarsi DO (5,6 – 6,2 ppm), suhu air (29,3 – 30,4 oC), salintas (32 – 33,7 ppt), pH (7,1 – 7,8), kekeruhan (20,2 – 42,5 NTU) dan kecepatan arus (0,15 – 0,55 m/det).  Bila dibandingkan dengan baku mutu air laut untuk kehidupan organisme laut secara keseluruhan masih layah terbukti ditemukanya beberapa jenis kerang seperti Anadara granosa A. pilula, A. Gubernaculum, A. Inaequivalvis, Pharella javanica, Paphia undulate, Marcia hiantina, Harvella plicataria, Mactra violacea dan Placuna placenta. Kata Kunci : Kualitas air, fishing ground, kerang

scholarly journals Sverdrup critical depth and the role of water clarity in Norwegian Coastal Water

2015 ◽  
Vol 72 (6) ◽  
pp. 2041-2050 ◽  
Author(s):  
D. L. Aksnes
Keyword(s):  
Dissolved Oxygen ◽  
Attenuation Coefficient ◽  
Coastal Water ◽  
Phytoplankton Bloom ◽  
Mixed Layer Depth ◽  
Light Attenuation ◽  
Water Clarity ◽  
Atlantic Water ◽  
Critical Depth ◽  
Light Attenuation Coefficient

Abstract The critical depth concept was first recognized by Gran and Braarud (1935). During summer, in the Bay of Fundy, they observed an unexpected no bloom situation. Their interpretation was that high amounts of detritus of terrestrial origin caused too murky water and insufficient light for the tidally mixed phytoplankton. Almost 20 years later, this was elaborated by Sverdrup (1953) into a hypothesis for the initiation of the spring bloom in the North Atlantic Water (NAW) masses. Since then, variations in mixed layer depth have been a key in phytoplankton modelling. As illustrated by the study of Gran and Braarud, variation in the non-phytoplankton light attenuation coefficient is also a key to understand phytoplankton bloom conditions. Due to lack of accurate parameterizations, however, non-phytoplankton light attenuation is often assumed invariant in phytoplankton modelling. Here, I report spatial variation in a proxy for the pre-bloom light attenuation in Norwegian Coastal Water (NCW). It is shown that this variation can be partially accounted for by variations in salinity and dissolved oxygen. The light attenuation coefficient at 440 nm increased by 0.041 and 0.032 m−1 with drops in salinity and dissolved oxygen of 1PSU and 1 ml O2 l−1, respectively. Consequences for the euphotic depth, Sverdrup critical depth, and the nutricline depth are discussed. I conclude that phytoplankton modelling, particularly across coastal and oceanic waters, such as NCW and NAW, needs to account for variations in the non-phytoplankton light attenuation and that salinity might be a useful proxy for regional parameterizations.

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