Mesoscale eddies and their dispersive environmental impacts in the Persian Gulf

Amin Raeisi; Abbasali Bidokhti; Seyed Mohammad Jafar Nazemosadat; Kamran Lari

doi:10.1088/1674-1056/ab96a3

Journals >Chinese Physics B >Volume 29 >Issue 8 >Page > Article

Chinese Physics B
Vol. 29, Issue 8, (2020)

Mesoscale eddies and their dispersive environmental impacts in the Persian Gulf

Amin Raeisi¹, Abbasali Bidokhti^2、†, Seyed Mohammad Jafar Nazemosadat³, and Kamran Lari⁴

Author Affiliations

¹Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran 477893855, Iran

²Geophysics Institute, University of Tehran, Tehran 1417614418, Iran

³Department of Water Engineering, Oceanic and Atmospheric Research Center, Shiraz University, Shiraz 71444165186, Iran

⁴Department of Physical Oceanography, Faculty of Marine Science and Technology, Tehran North Branch, Islamic Azad University, Tehran 1987973133, Iran

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DOI: 10.1088/1674-1056/ab96a3 Cite this Article

Amin Raeisi, Abbasali Bidokhti, Seyed Mohammad Jafar Nazemosadat, Kamran Lari. Mesoscale eddies and their dispersive environmental impacts in the Persian Gulf[J]. Chinese Physics B, 2020, 29(8): Copy Citation Text

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(a) Map of the Persian Gulf region based on ETOPO2 data, depth in terms of meters.[4] (b) Water circulation in the Persian Gulf from August to November.[9]

Fig. 1. (a) Map of the Persian Gulf region based on ETOPO2 data, depth in terms of meters.^[4] (b) Water circulation in the Persian Gulf from August to November.^[9]

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Fig. 2. Height contours in the Persian Gulf for various seasons on (a) 19 August 2014 and (b) 12 February 2014.

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Fig. 3. Histogram of the mean number of eddies in different months from 2010 to 2014.

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Fig. 4. Percentage of the monthly mean of eddies considering their polarity (2010–2014) (the red and blue histograms are assigned to anti-cyclonic and cyclonic eddies, respectively).

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Fig. 5. The dispersion histogram of the percentage of the mean of eddy diffusion coefficient over a tensile interval (the red and blue histograms are assigned to the anti-cyclonic and cyclonic eddies, respectively).

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Fig. 6. Maps showing the place of eddies in winter (a) and summer (b) 2014 (the cyclonic and anti-cyclonic eddies with the highest diffusion coefficient are represented by five-pointed blue and red stars, respectively).

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Fig. 7. The contour maps showing eddy diffusion coefficients in summer (2014) (the high-risk areas are marked with a number).

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Fig. 8. (a) and (b) Maps extracted from simulations provided by Thoppil and Hugan^[8] (left) and SSH maps plotted based on AVISO data (right).

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	Spring	Summer	Autumn	Winter	Total
Cyclonic	62.10%	58.60%	55.90%	60.90%	59.10%
Anti-cyclonic	37.90%	41.40%	44.10%	39.10%	40.90%

Table 1. Percentage of the seasonal mean of eddies considering the polarity (2010–2014).

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Season	Number of eddies	L_eff/km	k^xy/(m²/s)	Lifetime/week	Date of event
Winter	20	102.95	76.70	1	26 February
	2(AC)	105.27	54.2	1	25 December
	18	65.79	53.15	3	5 March
	21	73.88	52.33	1	26 February
Spring	21	48.34	87.25	3	3 June
	21	85.59	82.68	3	27 May
	24	52.79	69.35	1	10 June
	13	49.86	62.85	1	6 May
Summer	4	53.79	116.81	4	15 July
	3	95.69	108.67	2	8 July
	1	102.42	108.09	2	15 July
	9	60.12	107.01	6	2 September
Autumn	5	77.80	79.11	3	21 October
	34	63.14	72.53	1	23 December
	14(AC)	57.51	69.93	4	2 December
	32(AC)	47.25	68.08	1	23 December

Table 2. Eddies with the highest diffusion coefficients k^xy (2014).

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Number of area	Area/km²	The mean of diffusion coefficient in the target area/(m²/s)	Location
			Longitude/degree		Latitude/degree
			from	to	from	to
1	15220.99	78.05	25.78	27.57	51.38	53.82
2	2443.09	76.02	25.74	26.42	53.42	53.98
3	4573.55	70.08	25.51	26.1	54.37	55.28
4	3901.59	65.23	27.57	28.40	48.92	50.21

Table 3. Areas of eddy occurrence along with the mean of diffusion coefficients in summer (2014).

Amin Raeisi, Abbasali Bidokhti, Seyed Mohammad Jafar Nazemosadat, Kamran Lari. Mesoscale eddies and their dispersive environmental impacts in the Persian Gulf[J]. Chinese Physics B, 2020, 29(8):

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