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The seasonal variations of the climatic circulation of the Black Sea waters along the axis of divergence zone. O.R.Andrianova, R.R.Belevich, M.I.Skipa.

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Presentation on theme: "The seasonal variations of the climatic circulation of the Black Sea waters along the axis of divergence zone. O.R.Andrianova, R.R.Belevich, M.I.Skipa."— Presentation transcript:

1 The seasonal variations of the climatic circulation of the Black Sea waters along the axis of divergence zone. O.R.Andrianova, R.R.Belevich, M.I.Skipa Hydroacoustic Branch of MHI NASU Odessa, Ukraine Odessa, Ukraine

2 The aim of this work is : detecting of features of the seasonal water circulation in the surface and intermediate layers of the Black Sea open waters, which is based on an analysis of the dynamic heights distribution along the axis of the main Black Sea divergence zone.

3 The map of the temperature and salinity data by squares in the Black Sea

4 Annual climatic maps of the dynamic topography layers of the Black Sea (dotted line is the position of the axis of the divergence zone). (a) 0-50 m (b) 0-500 m

5 The distribution of the dynamic heights along an divergence zone axis of the Black Sea by months for layer 0-50m 1, 3 – centers of western and eastern cyclonic gyres, 2-ridge, ellipses schematically show the positions of the cyclonic gyres, I-XII - months.

6 Ellipses schematically show the positions of the cyclonic gyres, vertical line - ridge, dotted lines – centers of the cyclonic gyres. 1- Coastal back and forth current 2- Main Black Seas current 3 - Counter current 4 - Western branch of the Western cyclonic gyre 5 - Eastern branch of the Western cyclonic gyre 6 - Western branch of the Eastern cyclonic gyre 7- Eastern branch of the Eastern cyclonic gyre The distribution of the dynamic topography along the axis of the divergence zone for the horizons by the seasons

7 Annual climatic map of dynamic topography of layer 0-500 m of the Black Sea (dotted line shows the position of the axis of the divergence zone).

8 a) - winter, spring; b) - summer, autumn.a) - winter, spring; b) - summer, autumn. Winter (1,3,5); Spring (2,4,6); Summer (7,9,11); Autumn (8,10,12)Winter (1,3,5); Spring (2,4,6); Summer (7,9,11); Autumn (8,10,12) Western Zn (1,2,7,8); Ridge (3,4,9,10); Eastern Zn (5,6,11,12)Western Zn (1,2,7,8); Ridge (3,4,9,10); Eastern Zn (5,6,11,12) The scheme of the position of the centers of western and eastern cyclonic gyres and the ridge by the depth, by longitude and by the seasons

9 Climatic characteristics of the cyclonic circulations in the Black Sea along the axis of the divergence zone Season West cyclonic gyre zone Ridge East cyclonic gyre zone Length Width Center location Length Width Center location Winter31-343323434-38436 Spring29-356333535-38336 Summer29-356323535-41636 Autumn31-354333535-38336 (Values shown in degrees of East longitude)

10 Conclusions For the first time the divergence zone of the Black Sea was identified and described. For the first time the divergence zone of the Black Sea was identified and described. The axis of divergence zone was determined. This axis is situated in the middle part of the Black Sea and stretches from south coast of Bulgaria till south coast of Caucasus. The axis of divergence zone was determined. This axis is situated in the middle part of the Black Sea and stretches from south coast of Bulgaria till south coast of Caucasus. The specific features of the structure, spatial distribution and seasonal variability of flows and gyres that placed along the divergences zone in the surface and intermediate layers were found out. The specific features of the structure, spatial distribution and seasonal variability of flows and gyres that placed along the divergences zone in the surface and intermediate layers were found out. Seasonal variability of positions and intensity were estimated for Main Black Seas Current, cyclonic gyres and ridge. Velocities of the currents were calculated. Seasonal variability of positions and intensity were estimated for Main Black Seas Current, cyclonic gyres and ridge. Velocities of the currents were calculated. The impact of spring floods of the rivers in the north-western region of Black Sea to the water circulation in the surface layers in the open sea area was described. The impact of spring floods of the rivers in the north-western region of Black Sea to the water circulation in the surface layers in the open sea area was described. Three separate types of the circulation in the open waters of the Black Sea were detected in an annual cycle: Three separate types of the circulation in the open waters of the Black Sea were detected in an annual cycle: - In winter equivalent western and eastern cyclonic gyres occur. - In spring western cyclonic gyre dominates. - In summer and autumn the eastern cyclonic gyre dominates. Obtained results certainly should be very important for data analysis and development of prognostic models of ecological situations in the Black Sea. Obtained results certainly should be very important for data analysis and development of prognostic models of ecological situations in the Black Sea.

11 Thanks for your attention!

12 The average (normal component) current velocity (cm / s) according to the season in streams of water allocated along the divergence of horizons (m) WINTER м CBF C MBS C CC WB WZn EBWZnWBEZnEBEZnCCMBSCCBFC 0-6-55-3-25122-14 523385122 10-4-52-2-10121-14 1022384619 30-51-9022-14-131017364619 500-501-10121-11-13916164418 750-452-10219-8-12614153816 1000373-3 16-8-1051233213 1500253-7411-4-8310-33194 2000171-648-3-618-44120 300060-324-2-3110460 SPRING м CBF C MBSC+WBWZnEBWZn WBE Zn EBEZnCCMBSCCBFC 0-12-58-10-416101172273813 10-10-56-10-4-21663-217227358 30-10-52-9-4156-3015127334 500-56-7-5-2145-2114126325 750-50-4-3124-3112124295 100-38-21-4103-311021234 1504-26-23-481-22612142 2000-142-36 14-29100 3000-6133 0 3 430 E 28 2930 31 32 33 34 35 36 3738 394041 41,6

13 SUMMER м CBF C MBSC+WBWZnEBWZn WBE Zn EBEZn + MBSCCBFC 0-12-18-16-1111124-2045223625-7 10-9-17-16-1011 3-1624172823-4 30-6-17-15-1013144-1252212819-2 50-3-17-12-913 5-186125 17-4 750-14-11-712114-1643928124 1000-9 61283-1433121714-4 1500-90-4106-4-734510 -2 2000-50-3721-943970 3000-31-232-321 821 AUTUMN м CBF C MBS C CCWBWZnEBWZn WBE Zn EBEZnCCMBSCCBFC 0-5-392-11-131210-153232539 10-4-393-11-151112-16322242610 30-2-393-10-912 -1661723 7 500-364-8-91013-1661621 5 750-315-7-4912-14614-321173 1000-276-6-3710-12512-318133 1500-195-366-73710 -2 2000-155-344-42466 3000-21031 300060 E 28 2930 31 32 33 34 3536 3738 394041 41,6 The average (normal component) current velocity (cm / s) according to the season in streams of water allocated along the divergence of horizons (m)

14 The scheme of water circulation in the Black Sea 1 – Main Black sea current (MBSC) – average position of a core; 2 – meanders of MBSC; 3 – Coastal anticyclonic eddy (CAE); 4 – cyclonic eddy (CE); 5 – Batumi anticyclonic eddy; 6 – Kaliakra CAE; 7 – Sevastopol CAE; 8 – Kerch CAE; 9 – quasistationary cyclonic gyre.


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