scholarly journals A Prolonged High-Salinity Event in the Northern Arabian Sea during 2014–17

2020 ◽  
Vol 50 (4) ◽  
pp. 849-865 ◽  
Author(s):  
Yuhong Zhang ◽  
Yan Du ◽  
W. N. D. S Jayarathna ◽  
Qiwei Sun ◽  
Ying Zhang ◽  
...  
Keyword(s):  
Arabian Sea ◽  
High Salinity ◽  
Southwest Monsoon ◽  
Early Summer ◽  
Current Data ◽  
Gulf Of Oman ◽  
High Salinity Water ◽  
Northern Arabian Sea ◽  
Salinity Increase ◽  
Salinity Water

AbstractA prolonged high-salinity event in the northern Arabian Sea, to the east of the Gulf of Oman, during 2014–17 was identified based on Argo datasets. The prolonged event was manifested as enhanced spreading of the surface Arabian Sea high-salinity water and the intermediate Persian Gulf water. We used satellite altimetric data and geostrophic current data to understand the oceanic processes and the salt budget associated with the high-salinity event. The results indicated that the strengthened high-salinity advection from the Gulf of Oman was one of the main causes of the salinity increase in the northern Arabian Sea. The changes of the seasonally dependent eddies near the mouth of the Gulf of Oman dominated the strengthened high-salinity advection during the event as compared with the previous 4-yr period: the westward shifted cyclonic eddy during early winter stretched to the remote western Gulf of Oman, which carried the higher-salinity water to the northern Arabian Sea along the south coast of the Gulf. An anomalous eddy dipole during early summer intensified the eastward Ras Al Hadd Jet and its high-salinity advection into the northern Arabian Sea. In addition, the weakened low-salinity advection by coastal currents along the Omani coast caused by the weakened southwest monsoon contributed to the maintenance of the high-salinity event. This prolonged high-salinity event reflects the upper-ocean responses to the monsoon change and may affect the regional hydrography and biogeochemistry extensively.

scholarly journals Hydrographic survey over the Carlsberg Ridge in May 2012

2019 ◽  
Author(s):  
Hailun He ◽  
Yuan Wang ◽  
Xiqiu Han ◽  
Yanzhou Wei ◽  
Pengfei Lin ◽  
...  
Keyword(s):  
Arabian Sea ◽  
High Salinity ◽  
Sea Water ◽  
Phase Speed ◽  
Thermocline Depth ◽  
High Salinity Water ◽  
Salty Water ◽  
Hydrographic Survey ◽  
Carlsberg Ridge ◽  
Salinity Water

Abstract. In May 2012, we conducted a hydrographic survey over the Carlsberg Ridge in the northwest Indian Ocean. In this paper, we use these station data, in combination with some free-floating Argo profiles, to obtain the sectional temperature and salinity fields, and subsequently, the hydrographic characteristics are comprehensively analyzed. Through the basic T-S diagram, three salty water masses, Arabian Sea High-Salinity Water, Persian Gulf Water, and Red Sea Water, are identified. The sectional data show a clear ventilation structure associated with Arabian Sea High-Salinity Water. The 35.8 psu salty water sinks at 6.9° N and extends southward to 4.4° N at depths around the thermocline, where the thermocline depth is in the range of 100 to 150 m. This salty thermocline extends much further south than the climatology indicates. Furthermore, the temperature and salinity data are used to compute the absolute geostrophic current over the specific section, and the results show meso-scale eddy vertical structure different from some widely used oceanic reanalysis data. We also find a west-propagating disturbance at 6° N, and the related features are described in terms of phase speed, horizontal and vertical structures.

scholarly journals Intra annual Variability of the Arabian Sea high salinity water mass in the South Eastern Arabian Sea during 2016 17

2019 ◽  
Vol 69 (2) ◽  
pp. 149-155
Author(s):  
P. A. Maheswaran ◽  
S. Satheesh Kumar ◽  
T. Pradeep Kumar
Keyword(s):  
Temporal Variability ◽  
Arabian Sea ◽  
Water Mass ◽  
High Salinity ◽  
High Salinity Water ◽  
South Eastern ◽  
Saline Waters ◽  
Eastern Arabian Sea ◽  
Salinity Water ◽  
Spatio Temporal

Intra-annual variability of the Arabian Sea high salinity water mass (ASHSW) in the South Eastern Arabian Sea (SEAS) and Gulf of Mannar (GoM) are addressed in this paper by utilisng the monthly missions carried out onboard INS Sagardhwani during 2016-17. Our observations revealed that the ASHSW was evident along the SEAS irrespective of seasons, whereas in the GoM the presence of ASHSW was observed during winter. The processes such as downwelling/up-welling, coastal currents, intrusion of low saline waters, stratification are clearly affects the spreading of the ASHSW. The characteristics such as core salinity value, depth and thickness of ASHSW exhibited remarkable spatio-temporal variability. Lateral mixing with the low saline waters in the region during winter reduces its core salinity. The intrusion of low saline waters was clearly seen upto 15 ON but the intrusion of low saline waters is not flowing through the GoM. The interface between the ASHSW and the prevailing low saline waters showed strong horizontal gradients of salinity. The presence of the ASHSW makes difference in the SLD and the below layer gradient which is sufficient to complicate or influence sound transmission. The spatio temporal variability of the ASHSW and its acoustic relevance are documented in this paper.

scholarly journals Mesoscale eddies and submesoscale structures of Persian Gulf Water off the Omani coast in Spring 2011

2015 ◽  
Vol 12 (6) ◽  
pp. 2743-2782
Author(s):  
P. L'Hégaret ◽  
X. Carton ◽  
S. Louazel ◽  
G. Boutin
Keyword(s):  
Persian Gulf ◽  
Arabian Sea ◽  
High Salinity ◽  
Cold Water ◽  
Mesoscale Eddies ◽  
High Salinity Water ◽  
Persian Gulf Water ◽  
Salinity Water ◽  
The Persian Gulf ◽  
Sea Of Oman

Abstract. The Persian Gulf produces a high salinity water (Persian Gulf Water, PGW hereafter) flowing into the Sea of Oman, in the northwestern Indian Ocean. Past the Strait of Hormuz, the PGW cascades down the continental slope and spreads in the Sea of Oman under the influence of the energetic mesoscale eddies with different thermohaline signatures and pathways depending of the season. In spring 2011, the Phys-Indien experiment was carried out in the Arabian Sea an in the Sea of Oman. This study uses the results from the measurements to characterize the water masses, their thermohaline and dynamical signatures. During the spring intermonsoon, an anticyclonic eddy is often observed at the mouth of the Sea of Oman. This structure was present in 2011 and created a front between the eastern and western part of the basin. As well two energetic gyres were present along the Omani coast in the Arabian Sea. At their peripheries, injections of fresh and cold water are found in relation with the stirring of the eddies. The PGW observed below or between these eddies have a different dilution depending of the position and formation periods of the gyres. Furthermore, in the western Sea of Oman, the PGW is fragmented in filaments and submesoscale eddies. As well, recirculation of the PGW is observed, thus having the presence of salty nearby patches with two densities. Offshore, in the Arabian Sea, a submesoscale lens was recorded. The different mechanisms leading to its formation and presence are assessed here.

scholarly journals Anomalous distribution of distinctive water masses over the Carlsberg Ridge in May 2012

Ocean Science ◽  
2020 ◽  
Vol 16 (4) ◽  
pp. 895-906
Author(s):  
Hailun He ◽  
Yuan Wang ◽  
Xiqiu Han ◽  
Yanzhou Wei ◽  
Pengfei Lin ◽  
...  
Keyword(s):  
Arabian Sea ◽  
High Salinity ◽  
Mesoscale Eddy ◽  
Phase Speed ◽  
Water Masses ◽  
Thermocline Depth ◽  
High Salinity Water ◽  
Salty Water ◽  
Carlsberg Ridge ◽  
Salinity Water

Abstract. In May 2012, we conducted a hydrographic survey over the Carlsberg Ridge in the northwest Indian Ocean. In this paper, we use these station data, in combination with some free-floating Argo profiles, to obtain the sectional temperature and salinity fields, and subsequently, the hydrographic characteristics are comprehensively analyzed. Through the basic T–S diagram, three salty water masses, Arabian Sea High-Salinity Water, Persian Gulf Water, and Red Sea Water, are identified. The sectional data show a clear ventilation structure associated with Arabian Sea High-Salinity Water. The 35.8 psu salty water sinks at 6.9∘ N and extends southward to 4.4∘ N at depths around the thermocline, where the thermocline depth is in the range of 100 to 150 m. This salty thermocline extends much further south than climatology indicates. Furthermore, the temperature and salinity data are used to compute the absolute geostrophic current over the specific section, and the results show mesoscale eddy vertical structure different from some widely used oceanic reanalysis data. We also find a west-propagating planetary wave at 6∘ N, and the related features are described in terms of phase speed and horizontal and vertical structures.

Monthly Water Exchange through the Ryukyu Islands Revealed by Salinity Structural Changes

2013 ◽  
Vol 864-867 ◽  
pp. 2335-2339
Author(s):  
Ya Pan Liu ◽  
Jian Cheng Kang ◽  
Jiong Zhu ◽  
Qin Chen Han
Keyword(s):  
Structural Changes ◽  
Water Exchange ◽  
High Salinity ◽  
World Ocean ◽  
Core Layer ◽  
Ryukyu Islands ◽  
High Salinity Water ◽  
The Ryukyu Islands ◽  
Salinity Water ◽  
World Ocean Atlas

Using salinity database of World Ocean Atlas 2009 (WOA09) issued by NOAA in 2010, refer the range of high-salinity tongue to indicate the strength about high-salinity water, from the perspective of structural changes of salinity; the water exchange through Ryukyu Islands upper 500 m have been analyzed, the results show that: due to Ryukyu Trough, currents on both sides of Ryukyu Islands occur exchange, for upper 500 m, high-salinity water in east of the Ryukyu Islands mainly invade the west waterthe Kuroshio in East China Sea; the intrusion strength is powerful from the depth of 100 m to 200 m, and the 150 m layer is the core layer of high-salinity water intrusion; the high-salinity water at the east of Ryukyu Islands invades the Kuroshio are stronger in March, May, June, September, October and November, are weaker in April and December.

scholarly journals Mesoscale eddies and submesoscale structures of Persian Gulf Water off the Omani coast in spring 2011

Ocean Science ◽  
2016 ◽  
Vol 12 (3) ◽  
pp. 687-701 ◽  
Author(s):  
Pierre L'Hégaret ◽  
Xavier Carton ◽  
Stephanie Louazel ◽  
Guillaume Boutin
Keyword(s):  
Persian Gulf ◽  
Arabian Sea ◽  
Cold Water ◽  
Mesoscale Eddies ◽  
High Salinity Water ◽  
Strait Of Hormuz ◽  
Persian Gulf Water ◽  
Salinity Water ◽  
The Persian Gulf ◽  
Sea Of Oman

Abstract. The Persian Gulf produces high-salinity water (Persian Gulf Water, PGW hereafter), which flows into the Sea of Oman via the Strait of Hormuz. Beyond the Strait of Hormuz, the PGW cascades down the continental slope and spreads in the Sea of Oman under the influence of the energetic mesoscale eddies. The PGW outflow has different thermohaline characteristics and pathways, depending on the season. In spring 2011, the Phys-Indien experiment was carried out in the Arabian Sea and in the Sea of Oman. The Phys-Indien 2011 measurements, as well as satellite observations, are used here to characterize the circulation induced by the eddy field and its impact on the PGW pathway and evolution. During the spring intermonsoon, an anticyclonic eddy is often observed at the mouth of the Sea of Oman. It creates a front between the eastern and western parts of the basin. This structure was observed in 2011 during the Phys-Indien experiment. Two energetic eddies were also present along the southern Omani coast in the Arabian Sea. At their peripheries, ribbons of freshwater and cold water were found due to the stirring created by the eddies. The PGW characteristics are strongly influenced by these eddies. In the western Sea of Oman, in 2011, the PGW was fragmented into filaments and submesoscale eddies. It also recirculated locally, thus creating salty layers with different densities. In the Arabian Sea, a highly saline submesoscale lens was recorded offshore. Its characteristics are analyzed here and possible origins are proposed. The recurrence of such lenses in the Arabian Sea is also briefly examined.

scholarly journals Preliminary assessment of the potential for mangrove oyster cultivation in Piraquê-açu river estuary (Aracruz, ES)

2006 ◽  
Vol 49 (1) ◽  
pp. 163-169 ◽  
Author(s):  
Luciana Alvarenga ◽  
Rosebel Cunha Nalesso
Keyword(s):  
High Salinity ◽  
Shell Height ◽  
River Estuary ◽  
Oyster Shell ◽  
Preliminary Assessment ◽  
High Salinity Water ◽  
Salinity Water ◽  
High Predation ◽  
Fouling Organisms ◽  
Oyster Cultivation

At Piraquê-açu river estuary, Aracruz, ES, the technical viability of Crassostrea rhizophorae cultivation was determined through monthly measures in shell length and weight. Seeds of C. rhizophorae were put in cages and suspended in rafts. Increase in height and weight (flesh and dry) of the oysters was measured. During ten months (July/98 to May/99), oyster shell reached an average of 37.6 mm in shell height and 3.0 g in flesh weight (the whole animal). High mortality rates were registered and could be related to the high salinity water and to high predation observed, especially by flatworms Stylochophana divae and snails Cymatium parthenopeum, as well as fouling organisms such as barnacles, Serpulidae polychaetes and seed of the same species.

Effective removal of 60Co from high-salinity water by Ca–Mg phosphate sorbents

2018 ◽  
Vol 318 (3) ◽  
pp. 2341-2347 ◽  
Author(s):  
Andrei Ivanets ◽  
Natalja Kitikova ◽  
Irina Shashkova ◽  
Artem Radkevich ◽  
Lyudmila Shemet ◽  
...  
Keyword(s):  
High Salinity ◽  
High Salinity Water ◽  
Effective Removal ◽  
Salinity Water
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