gesjGEOGRAPHY, ENVIRONMENT, SUSTAINABILITYGEOGRAPHY, ENVIRONMENT, SUSTAINABILITY2071-93882542-1565Russian Geographical Society10.24057/2071-9388-2020-77gesj-1325Research ArticleRESEARCH PAPERСтатьиIce Features Of The Northern Caspian Under Sea Level Fluctuations And Ice Coverage VariationsOgorodovStanislav A.

Leninskie Gory, 1, 119991, Moscow

MagaevaAnastasiia A.

41, Chehova, 344006, Rostov-on-Don; 105/42, Bolshaya Sadovaya Str., Rostov-on-Don, 344006

a.magaeva@mail.ruMaznevStepan V.

Leninskie Gory, 1, 119991, Moscow

YaitskayaNatalia A.

2/28, Yana Fabritsiusa Str., Sochi, 354340

VernyayevSergey

13, Maily Kozha Str., 060050, Shymkent

SigitovAnton

13, Maily Kozha Str., 060050, Shymkent

KadranovYevgeniy

13, Maily Kozha Str., 060050, Shymkent

Lomonosov Moscow State UniversityRussian FederationSouthern Scientific Centre of Russian Academy of Sciences; South Federal UniversityRussian FederationSubtropical Scientific Centre of the Russian Academy of SciencesRussian FederationLLP ICEMAN.KZKazakhstan202002102020133129138Copyright © Ogorodov S.A., Magaeva A.A., Maznev S.V., Yaitskaya N.A., Vernyayev S., Sigitov A., Kadranov Y., 20202020Ogorodov S.A., Magaeva A.A., Maznev S.V., Yaitskaya N.A., Vernyayev S., Sigitov A., Kadranov Y.Ogorodov S.A., Magaeva A.A., Maznev S.V., Yaitskaya N.A., Vernyayev S., Sigitov A., Kadranov Y.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://ges.rgo.ru/jour/article/view/1325

The  Caspian Seaseasonal ice cover develops  each  winter despite  of it being  in mid-latitudes.  Increasing development of oil and gas fields challenges researchers to ensure operational safety. TheCaspian Seahas seen significant water level fluctuations in its recent history. And in the same time, it is vulnerable to effects of climate change. Extensive studies on ice conditions conducted  in the region don’t provide insights on influence of these factors in combination to describe ice cover behavior and ice features distribution.  We classify winter seasons of theNorthern Caspianby their severity calculating the cumulative freezing-degree days (CFDD). Ice charts based on aerial reconnaissance with support of the OSI-450 reanalysis provided data on the ice coverage, the timing of ice formation and destruction, the duration of the ice seasons from 1979 to 2015. We analyzed the stamukhi distribution on theNorthern Caspianfrom aerial reconnaissance for 1973–1980 and satellite imagery deciphering for 2013–2019  periods along with sea level dynamics. We found out that the amount of severe and moderate winters reduces while mild winters number increases. This leads to a decrease in the mean ice area and ice duration at theNorthern Caspian. Comparison of two periods with different sea levels and ice coverage showed that both factors affect the distribution of stamukhi by depth and distance to coast in theNorthern Caspian. Comparison of stamukhi locations in moderate winter seasons showed that their distribution is determined by the area of ice cover. In case of similar ice conditions, the stamukhi distribution is determined by sea level. The zone of their highest concentration shifts along with the coastline offset.

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The authors declare that there are no conflicts of interest present.