scholarly journals Numerical simulations of spreading of the Persian Gulf outflow into the Oman Sea

Ocean Science ◽  
2010 ◽  
Vol 6 (4) ◽  
pp. 887-900 ◽  
Author(s):  
M. Ezam ◽  
A. A. Bidokhti ◽  
A. H. Javid
Keyword(s):  
Persian Gulf ◽  
Bottom Topography ◽  
World Ocean ◽  
Monthly Precipitation ◽  
Boundary Current ◽  
Surface Salinity ◽  
Data Set ◽  
Open Boundaries ◽  
The Mean ◽  
The Persian Gulf

Abstract. A three dimensional numerical model namely POM (Princeton Ocean Model) and observational data are used to study the Persian Gulf outflow structure and its spreading pathways during 1992. In the model, the monthly wind speed data were taken from ICOADS (International Comprehensive Ocean-Atmosphere Data Set) and the monthly SST (sea surface temperatures) were taken from AVHRR (Advanced Very High Resolution Radiometer) with the addition of monthly net shortwave radiations from NCEP (National Center for Environmental Prediction). The mean monthly precipitation rates from NCEP data and the calculated evaporation rates are used to impose the surface salinity fluxes. At the open boundaries the temperature and salinity were prescribed from the mean monthly climatological values from WOA05 (World Ocean Atlas 2005). Also the four major components of the tide were prescribed at the open boundaries. The results show that the outflow mainly originates from two branches at different depths in the Persian Gulf. The permanent branch exists during the whole year deeper than 40 m along the Gulf axis and originates from the inner parts of the Persian Gulf. The other seasonal branch forms in the vicinity of the shallow southern coasts due to high evaporation rates during winter. Near the Strait of Hormuz the two branches join and form the main outflow source water. The results of simulations reveal that during the winter the outflow boundary current mainly detaches from the coast well before Ras Al Hamra Cape, however during summer the outflow seems to follow the coast even after this Cape. This is due to a higher density of the colder outflow that leads to more sinking near the coast in winter. Thus, the outflow moves to a deeper depth of about 500 m (for which some explanations are given) while the main part detaches and spreads at a depth of about 300 m. However in summer it all moves at a depth of about 200–250 m. During winter, the deeper, stronger and wider outflow is more affected by the steep topography, leading to separation from the coast. While during summer, the weaker and shallower outflow is less influenced by bottom topography and so continues along the boundary.

scholarly journals Numerical simulations of spreading of the Persian Gulf outflow into the Oman Sea

2009 ◽  
Vol 6 (3) ◽  
pp. 3057-3100 ◽  
Author(s):  
M. Ezam ◽  
A. A. Bidokhti ◽  
A. H. Javid
Keyword(s):  
Numerical Model ◽  
Persian Gulf ◽  
Bottom Topography ◽  
Surface Wind ◽  
Surface Wind Speed ◽  
Ocean Model ◽  
Early Summer ◽  
Western Boundary ◽  
Boundary Current ◽  
The Persian Gulf

Abstract. A three dimensional numerical model namely, (Princeton Ocean Model) and some observational data are used to study the Persian Gulf outflow structure and its spreading pathways during two different time of the year, mid-winter and early summer. A few available observations show that the Persian Gulf outflow source water exhibits seasonal variations in temperature and salinity. The numerical model is set up by CTD measurements at its western boundary and monthly surface wind speed on the model domain from ICAODS data. The results show that the outflow originates from two branches at different depths in the Persian Gulf. The permanent branch that may exist during the whole year in deeper parts at about 40 m and originates from inner parts of the Persian Gulf and the other one is a seasonal branch that starts to form the vicinity of southern coast during winter months (February). Near the Strait of Hormuz the two branches are jointed together and form the main outflow source. Our findings reveal that during the winter the outflow boundary current detaches from the coast just at the Ras Al Hamra Cape, however for the summer the outflow seems to follow the coast even after this Cape, and appears to separate from the coast at the Ras Al Hadd Cape. This behavior is explained as follow: more saline outflow during February causes higher density and so sinking to deeper zone during the winter. Thus, it moves to deeper parts at about 500 m in contrast with that of May which is at about 300 m. During February at Ras Al Hamra Cape the deeper and stronger outflow is more affected by the steep topography slope leading to vortex stretching mechanism which causes it to meander as an "S" shape, while during May, weaker and shallower outflow is less influenced by bottom topography and so it continues along the boundary.

scholarly journals Growth and population biology of the sand-bubbler crab Scopimera crabricauda Alcock 1900 (Brachyura: Dotillidae) from the Persian Gulf, Iran

2021 ◽  
Vol 82 (1) ◽  
Author(s):  
Sana Sharifian ◽  
Vahid Malekzadeh ◽  
Ehsan Kamrani ◽  
Mohsen Safaie
Keyword(s):  
Persian Gulf ◽  
Population Biology ◽  
Slow Growth ◽  
Carapace Width ◽  
Population Data ◽  
Natural Mortality ◽  
Frequency Distributions ◽  
Iranian Coast ◽  
The Mean ◽  
The Persian Gulf

Abstract Background Dotillid crabs are introduced as one common dwellers of sandy shores. We studied the ecology and growth of the sand bubbler crab Scopimera crabricauda Alcock, 1900, in the Persian Gulf, Iran. Crabs were sampled monthly by excavating nine quadrats at three intertidal levels during spring low tides from January 2016 to January 2017. Results Population data show unimodal size-frequency distributions in both sexes. The Von Bertalanffy function was calculated at CWt = 8.76 [1 − exp (− 0.56 (t + 0.39))], CWt = 7.90 [1 − exp (− 0.59 (t + 0.40))] and CWt = 9.35 [1 − exp (− 0.57 (t + 0.41))] for males, females, and both sexes, respectively. The life span appeared to be 5.35, 5.07, and 5.26 years for males, females, and both sexes, respectively. The cohorts were identified as two age continuous groups, with the mean model carapace width 5.39 and 7.11 mm for both sexes. The natural mortality (M) coefficients stood at 1.72 for males, 1.83 for females, and 1.76 years−1 for both sexes, respectively. The overall sex ratio (1:0.4) was significantly different from the expected 1:1 proportion with male-biased. Recruitment occurred with the highest number of annual pulse once a year during the summer. Conclusions The results, which show slow growth, emphasize the necessity of proper management for the survival of the stock of S. crabricauda on the Iranian coast of the Persian Gulf.

scholarly journals Relationships between shallow-water cumacean assemblages and sediment characteristics facing the Iranian coast of the Persian Gulf

2009 ◽  
Vol 90 (1) ◽  
pp. 125-134 ◽  
Author(s):  
Daniel Martin ◽  
Ulla Fernadez-Arcaya ◽  
Paula Tirado ◽  
Éric Dutrieux ◽  
Jordi Corbera
Keyword(s):  
Shallow Water ◽  
Persian Gulf ◽  
Organic Content ◽  
Sediment Characteristics ◽  
Ecological Data ◽  
Sediment Organic Content ◽  
Mean Grain Size ◽  
Iranian Coast ◽  
The Mean ◽  
The Persian Gulf

During two sampling campaigns carried out in August 1998 and November 2002, 232 cumaeans from eight species belonging to the families Bodotriidae and Nannastacidae were collected. This paper presents the first ecological data on a shallow water tropical cumacean assemblage from the Persian Gulf, where 50% of the existing species were recently described as new for the science. Neither the environmental conditions (except for the sediment organic content) nor the cumacean assemblage descriptors differed between the two sampling periods. However, two different species dominated in each period (i.e. Eocuma travancoricum and Heterocuma inerme in 1998 and 2002, respectively) and the MDS analysis revealed differences in the assemblage composition between periods, particularly for the deepest sampling stations. An increasing density together with the increase in gravel content, and a decreasing density together with the increasing silt content characterized the distribution pattern of both the whole cumacean assemblages and the two dominant species, the latter being also positively correlated with the mean grain size and negatively correlated with depth and organic matter (E. travancoricum) and with depth (H. inerme).

Incidence and biology of Arcotheres tivelae (Crustacea: Decapoda) in Amiantis umbonella (Bivalvia: Veneridae) on the northern coast of the Persian Gulf, Iran

2010 ◽  
Vol 90 (4) ◽  
pp. 655-661 ◽  
Author(s):  
Hanieh Saeedi ◽  
Aria A. Ardalan
Keyword(s):  
Persian Gulf ◽  
Carapace Width ◽  
Host Record ◽  
Northern Coast ◽  
Significant Difference ◽  
The Mean ◽  
Amiantis Umbonella ◽  
Bandar Abbas ◽  
One Year ◽  
The Persian Gulf

The occurrence of pinnotherid crab Arcotheres tivelae in the bivalve mollusc Amiantis umbonella was investigated for one year on the Bandar Abbas coast (Persian Gulf, Iran). Specimens of A. umbonella were collected monthly from two transects from April 2007 to March 2008 and were investigated for presence of the Arcotheres tivelae. Infestation frequency of A. tivelae was 9.18% in a sample of 893 clams. From a total of 89 specimens of crabs, only eight were male. They were observed in late February and early March, all of them but one in association with female crabs. There was no significant difference between the sexes of the infested clams that pea crabs choose as a host. The mean carapace width of the crab A. tivelae was 7.7 ± 1.7 mm and the mean length of the Amiantis umbonella was 39.84 ± 8.93 mm. Clams in the mid and low tidal zones were more infested. There was no significant relationship between clam length–crab width (R2 = 0.28). The mean fecundity of crabs was 2517 ± 864 eggs. Infection caused a reduction of flesh weight of clams. There was no significant correlation between the frequency of crabs' occurrence and the temporal variability of water temperature, salinity, dissolved oxygen and pH in different months. This study provides the first report of the distribution of pea crabs A. tivelae in A. umbonella, a new clam host record in Iran.

Age and growth of flathead, Platycephalus indicus from the Persian Gulf (Bandar Abbas, Iran)

2014 ◽  
Vol 94 (5) ◽  
pp. 1063-1071 ◽  
Author(s):  
Dariush Mohammadikia ◽  
Ehsan Kamrani ◽  
Mohammad Reza Taherizadeh ◽  
Ayoub Soleymani ◽  
Ehsan Farokhi ◽  
...  
Keyword(s):  
Persian Gulf ◽  
Gonadosomatic Index ◽  
Mean Value ◽  
Age And Growth ◽  
Hepatosomatic Index ◽  
Mean Values ◽  
Males And Females ◽  
The Mean ◽  
Bandar Abbas ◽  
The Persian Gulf

In a study of the age and growth of Platycephalus indicus, a total of 1106 fish were collected from May 2011 to March 2012 in the coastal waters of Iran, Persian Gulf. The ages of 279 specimens were determined by sectioned otoliths. The ages of the females were estimated to be between 0+ to 7+ , while the ages of the males were from 0+ to 4+. The von Bertalanffy growth curve was well suited to the age/total length data of males and females as follows: Lt = 43.40{1–exp[−0.45(t + 0.328)]} for males, and Lt = 63 {1–exp[−0.50(t + 0.30)]} for females. linf = 43.40, k = 0.45, t0 = −0.328 for females and linf = 63, k = 0.50, t0 = −0.30 for males. The estimated values of natural mortality (M) were M = 0.886 yr−1 for females and 0.736 yr−1 for males, and the estimated Z values were 1.43 yr−1 for females and 1.62 yr−1 for males. The mean value of the gonadosomatic index for males and females was 0.82 ± 0.25 and 2.48 ± 0.59, respectively, in each year. The mean values of the hepatosomatic index (HSI) were 0.89 ± 0.20 for males and 1.28 ± 0.16 for females. The highest HSI values for this location were observed in January, and the lowest were in April.

The Pearl Fishing in the Persian Gulf

1917 ◽  
Vol 83 (2146supp) ◽  
pp. 100-101
Author(s):  
Edwin E. Calverley
Keyword(s):  
Persian Gulf ◽  
Pearl Fishing ◽  
The Persian Gulf
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