Seasonal variation of the principal tidal constituents  in the Bohai Sea

Wang, Daosheng; Pan, Haidong; Jin, Guangzhen; Lv, Xianqing

doi:10.5194/os-16-1-2020

Cited by 38 publications

(14 citation statements)

References 45 publications

(84 reference statements)

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“…This study continues our previous research of river plumes and ROFI's in the Kara Sea focused on the structure of the Ob-Yenisei plume (Osadchiev et al, 2020a), interaction between the Ob-and Yenisei-dominated parts of the Ob-Yenisei plume (Osadchiev et al, 2017, and spreading of the Kara ROFI to the Laptev Sea through the Vilkitsky Strait (Osadchiev et al, 2020b). In the current study, we focus on the formation and transformation of large-scale FSL in the Kara Sea.…”

supporting

confidence: 77%

“…Wind-induced Ekman transport is the major mixing mechanism of FSL in the Kara Sea because the local tidal circulation is very weak. Velocities of tidal currents in the study area do not exceed 0.2 m/s, therefore, tidal mixing of FSL is negligible (Kagan et al, 2011;Osadchiev et al, 2020a). As a result, weak wind forcing in summer in the central Kara Sea is an important factor for the stability of the Ob-Yenisei plume and its relatively slow transformation to the Kara ROFI.…”

Section: Ja Zmentioning

confidence: 92%

“…13 of 25 Several previous studies showed that elevated surface temperature and increased concentrations of Chl-a and CDOM are stable characteristics of FSLs in the Arctic Ocean, which form distinct frontal zones with cold and low-fluorescent ambient sea water (Fichot et al, 2013;Glukhovets & Goldin, 2014Kubryakov et al, 2016;Osadchiev et al, 2020aOsadchiev et al, , 2020bOsadchiev et al, , 2020c. Lewis and Arrigo (2020) demonstrated that standard algorithms overestimate observed Chl-a concentrations in the shelf water in the Kara Sea that is caused by high concentrations of CDOM in riverine water.…”

Section: 1029/2020jc016486mentioning

confidence: 99%

“…Strength and extent of this influence mainly depend on the volume of freshwater discharge and varies from negligible impact of small plumes formed by rivers with low discharge rates (Korotkina et al, 2011(Korotkina et al, , 2014Osadchiev, 2015;Osadchiev et al, 2020d;Ostrander et al, 2008;Romero et al, 2016) to the formation of stable freshened water masses in the upper ocean by the world's largest rivers on wide coastal and shelf areas (Denamiel et al, 2013;Geyer et al, 1996;Lentz, 1995;Schiller et al, 2011) as is the OSADCHIEV ET AL. case of the Ob-Yenisei plume in the Kara Sea (Osadchiev, 2017;Osadchiev et al, 2020a). The latter water masses with spatial extents on the order of hundreds of kilometers are commonly referred to as regions of freshwater influence (ROFI).…”

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confidence: 99%

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Structure of the Freshened Surface Layer in the Kara Sea During Ice‐Free Periods

et al. 2021

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The Kara Sea is a semi-enclosed sea located between the Siberian coast in the south, Novaya Zemlya in the west, and Severnaya Zemlya in the east (Figure 1). The water depth is less than 50 m at more than 40% of the Kara Sea; shallow areas are located mainly in the central and southeastern parts of the sea. This sea receives enormous freshwater discharge (∼1,500 km 3 annually) mainly from two large estuaries, namely, the Yenisei Gulf (630 km 3 from the Yenisei River) and the Gulf of Ob (530 km 3 from the Ob, Pur, and Taz rivers; Gordeev et al., 1996; Pavlov et al., 1996). Continental discharge to the Kara Sea has very large seasonal variability with a short freshet period in June-July that provides ∼50% of annual runoff and a long low discharge period in October-April caused by freezing of the inflowing rivers (Pavlov et al., 1996; Figure 1). Freshwater discharge forms the large freshened surface layer (FSL) in the Kara Sea which is among the largest freshwater reservoirs in the Arctic Ocean

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supporting

confidence: 77%

Section: Ja Zmentioning

confidence: 92%

Section: 1029/2020jc016486mentioning

confidence: 99%

mentioning

confidence: 99%

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Structure of the Freshened Surface Layer in the Kara Sea During Ice‐Free Periods

et al. 2021

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“…In order to study spreading of the Ob-Yenisei plume to the Laptev Sea we analyzed sea surface temperature (SST) products acquired from Terra/Aqua MODIS satellite data. Large river plumes formed in the Kara and Laptev seas during summer and early autumn are significantly warmer than surrounding sea due to the large temperature difference between river and sea water [33][34][35] . Due to very low solar radiation in the study areas, surface temperature contrast formed between shallow and deep water is much lower, than the contrast between the plumes and ambient sea 33 .…”

Section: Ob-yenisei and Lena Plumes Continental Discharge To Kara Anmentioning

confidence: 99%

Freshwater transport between the Kara, Laptev, and East-Siberian seas

Osadchiev

Pisareva

Spivak

et al. 2020

Sci Rep

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The Kara and Laptev seas receive about one half of total freshwater runoff to the Arctic Ocean from the ob, Yenisei, and Lena rivers. Discharges of these large rivers form freshened surface water masses over wide areas in these seas. these water masses, i.e., the ob-Yenisei and Lena river plumes, generate an eastward buoyancy boundary current that accounts for the large-scale zonal freshwater transport along the Siberian part in the Arctic ocean. in this study we investigate spreading of the ob-Yenisei plume from the Kara Sea to the Laptev Sea through the Vilkitsky Strait and of the Lena plume from the Laptev Sea to the east-Siberian Sea through the Laptev and Sannikov straits during ice-free season. Large horizontal density gradient between freshened plume water and salty ambient sea water is the main driver of these processes, however, their intensity strongly depends on local wind forcing. the ob-Yenisei plume is spreading to the Laptev Sea in a narrow alongshore current which is induced by strong and long-term southwesterly winds. Under other wind forcing the plume does not reach the Vilkitsky Strait. the Lena plume is almost constantly spreading to the east-Siberian Sea as a large-scale surface water mass which intensity is governed by eastward ekman transport and is prone to large synoptic variability. The Ob, Yenisei and Lena rivers contribute large volumes of freshwater discharge into the Kara (~ 1,500 km 3 annually from the Ob and Yenisei rivers) and Laptev (~ 800 km 3 annually from the Lena River) seas that account for approximately one half of the total river runoff into the Arctic Ocean 1-3. Most of the continental runoff to the Kara and Laptev seas is discharged during ice-free period in June-September and forms sea-wide Ob-Yenisei and Lena river plumes which are among the largest freshwater reservoirs in the Arctic Ocean 4-6. River plumes are freshened surface-advected water masses, which seasonally form a relatively thin surface layer, compared to ambient saline sea. As a result, dynamics of river plumes is buoyancy-driven and wind-driven 7-12 , which is also true for large Ob-Yenisei and Lena plumes 3,13-18. It was previously investigated, that in the absence of strong wind forcing the Coriolis force and large salinity gradient between river plumes and ambient shelf water induce a baroclinic flow along the coast, which was previously addressed in many studies 7,19-21. This flow can be favored or impeded by local wind forcing. The associated eastward freshwater transport along large segments of northern shores of Eurasia and North America is an important part of large-scale freshwater transport pathways in the Arctic Ocean 22-27. Eastward alongshore spreading of the Ob-Yenisei and Lena plumes as a buoyancy-driven boundary current was described as a part of the Siberian Coastal Current (SCC) 22 which is the Eurasian branch of the Riverine Coastal Domain (RCD) 26. However, only few previous studies specifically addressed spreading of these river plumes from their source sea to an eastward sea, i.e., ...

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Criteria of sea level, return periods, and design risk factor in Port Said Harbor (Egypt)

El-Geziry

El-Wakeel

2023

Arab J Geosci

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This work delivers comprehensive information on the statistical metrics of sea level in Port Said Harbor, which can be used for the mitigation plans and protection measures in its vicinity. The study used hourly sea level data extended over 10 years from January 2002 to December 2011. A comprehensive descriptive statistical analysis of sea level monthly variations was introduced. The T_Tide package was used to obtain the astronomical constituents, which are in turn used to calculate the form factor to specify the tidal cycle in the Harbor, and to obtain the main water level characteristics. The meteorological factor was calculated by subtracting the tidal elevation from the recorded sea level. The impact of the meteorological factors on the observed sea level fluctuations was more obvious in winter than in summer. The effect of the meteorological conditions on the observed possible largest sea level range was $${~}^{1}\!\left/ \!{~}_{3}\right.$$ 1 3 that of the tidal impact. No extreme sea level year, considered when the annual mean deviates from the regression line by more than twice the standard deviation, appeared during the decade of investigation. The return periods and the design lifetime risk were calculated. The highest probabilities of occurrence were concentrated in the levels between 70 and 80 cm, while the lowest were below 5 cm and above 110 cm. The return periods for all water levels ranged between 0.4 and 4.5 years. The coastal structures in the vicinity of the Harbor may have a short lifetime of only 50 years for its most pronounced level (75 cm). It is recommended to consider the present results upon designing mitigation plans and constructions within Port Said Harbor territory.

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Seasonal variation of the principal tidal constituents in the Bohai Sea

Cited by 38 publications

References 45 publications

Structure of the Freshened Surface Layer in the Kara Sea During Ice‐Free Periods

Structure of the Freshened Surface Layer in the Kara Sea During Ice‐Free Periods

Freshwater transport between the Kara, Laptev, and East-Siberian seas

Criteria of sea level, return periods, and design risk factor in Port Said Harbor (Egypt)

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