G. Yu. Pavlova

• PhD
• Researcher at V.I. Il'ichev Pacific Oceanological Institute

Hydrological and chemical surveys were conducted in the Uglovoy Bight in October, 2019, February, May and June, 2020 (in total 120 stations) and chemical analyses of water from 13 small rivers running into the bight were done on October 21-22, 2020. Extremely high concentration of nutrients was detected in the Peschanka, Saperka and Gryaznukha Rive...

Geochemical processes in the Artic are changing at accelerated rates due to climate change. We present the results of a study on the features of the isotopic and hydrochemical signals of discharging submarine subpermafrost groundwaters on the transect along the underwater extension of the Lena River Delta in the Laptev Sea. This study demonstrated...

Исследован диагенез органического вещества (ОВ) донных отложений, отобранных в феврале 2018 г. в местах залежей лечебных грязей: заливе Угловой, бухтах Воевода и Экспедиции (залив Петра Ве- ликого, Японское море). Была изучена карбонатная система донных отложений, состав поровой во- ды на содержание биогенных веществ, растворенного органического уг...

In February and July 2014, multidisciplinary geochemical studies of the sediments were carried out at two stations. One of them was located in Voevoda Bight, which has a bottom depth of 4 m, covered by eelgrass (Zostera marina L.); the other one served as a background station, because it is devoid of seagrass and is located in the northern part of...

The empirical relationship between the mineralization of riverine waters and specific conductivity normalized to 15°C was obtained in testing Razdolnaya River water from March 2013 to April 2014. It was shown that the obtained equation made it possible to calculate the water mineralization to a satisfactory accuracy for rivers of calcium -carbonate...

The empirical relationship between the mineralization of riverine waters and specific conductivity normalized to 15°C was obtained in testing Razdolnaya River water from March 2013 to April 2014. It was shown that the obtained equation made it possible to calculate the water mineralization to a satisfactory accuracy for rivers of calcium–carbonate...

Field studies of the seasonal and daily dynamics of the mixing zone were carried out in the microtidal estuary of the Partizanskaya River. The position of the mixing zone was determined by river runoff volume. The upstream boundary of the mixing zone was located at a distance from 5 (at river discharge of 73.67 m³/s) to 12.5 km (at 7.7 m³/s) from t...

Chemical water parameters in the Partizanskaya River estuary were measured on July 18–19, 2012 in conditions of low water discharge (20.1 m3 /s). In these conditions, the cline of salt water at the bottom penetrated up to 11 km upstream from the river mouth and the fresh river water passed the estuarine zone of mixing in approximately 2 days. Salt...

The paired Mg/Ca, stable oxygen and carbon isotope measurements were conducted on the shallow infaunal benthic foraminifers Uvigerina auberiana and Uvigerina akitaensis from the core MD01-2415 sediments from 140 to 101 kyr BP including end of penultimate glacial (PG), penultimate deglaciation (PD), Last Interglacial (LIG) optimum and last glacial i...

The hydrological and hydrochemical parameters of the Tumen River estuary were collected at 13 stations in May and October 2015. Vertical temperature, conductivity, dissolved oxygen, chlorophyll fluorescence, and turbidity profiles were obtained. Water was sampled from the surface and bottom layer. The water samples were analyzed for major ions, pH,...

During Cruise 62nd of the R/V “Professor Gagarinsky” in September, 2014, the carbonate system of sediments and contents of nutrients and organic carbon in pore water were studied in two geochemical stations located in hypoxia areas in the Peter the Great Bay. It was established that the concentrations of silica, phosphorus, and ammonium increase by...

In article the organization of a rationing system in the territory of Krasnodar Krai during the period after the German occupation since February, 1943 is considered. After liberation of Kuban it was necessary to adjust life and work of the big region and also in the shortest possible time to begin supply of food and industrial goods for soldiers o...

The paper suggests an accurate approach to studying carbonate equilibrium in the water of the Razdol’naya River. The approach involves measuring pH by Pitzer’s scale, using a cell without liquid junction; measuring the total alkalinity by Bruevich’s technique; and using apparent constants of carbonate equilibrium with regard for the organic alkalin...

Relevance. Rare earth elements (REE) and parameters of the basic salt composition (BSC) are the indicators of the ecological state of river waters and they can be used for water subjects monitoring system. The aim of the research is a comprehensive study of the REE and BSC to identify the factors determining the anthropogenic load on the basins of...

Seasonal hydrochemical studies of the basic salt composition of water in the Partizanskaya R. estuary (Nakhodka Bay, the Sea of Japan), carried out in 2012, showed no within-year changes in the ratio of major ions, and hence the type of mineralization, in the river against a background of a pronounced seasonal variation of total mineralization. The...

The complex study of the river water and pore solutions from the bottom sediments in the lower reaches of the Razdol’naya River was conducted in February 2010. The major ion composition of the waters indicates the submarine origin of the near-bottom and pore waters in the lower reaches of the Razdol’naya River in the winter. The river estuary exten...

The most important feature of the distribution of the alkalinity and calcium in the Sea of Japan—the increase in the potential alkalinity with depth under the conditions when the waters are supersaturated in relation to calcium carbonate—is considered. It is demonstrated that this fact cannot be accounted for by the reaction of the formation-dissol...

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Live (Rose Bengal stained) benthic foraminifera were investigated in surface sediment samples from the Okhotsk Sea to reveal the relationship between faunal characteristics and environmental parameters. Live benthic foraminifera were quantified in the size fraction >125 mu m in the upper 8 cm of replicate sediment cores, recovered with a multicorer...

In 2000, the Carbon Dioxide in the Ocean working group of the North Pacific Marine Science Organization (PICES) performed an international experiment on the intercalibration of the measurements of the total alkalinity in seawater using certified reference materials (CRM). Taking part in this experiment, Russian specialists presented the method by B...

Two sediment cores retrieved at the northern slope of Sakhalin Island, Sea of Okhotsk, were analysed for biogenic opal, organic carbon, carbonate, sulphur, major element concentrations, mineral contents and dissolved substances including nutrients, sulphate, methane, major cations, humic substances and total alkalinity. Down-core trends in mineral...

During the summer seasons of 2002 and 2004, the total alkalinity (TA) and dissolved calcium (Ca) were studied at 41 stations in different areas of the Sea of Okhotsk: the Kuril depression, Deryugin Basin, the slopes of the Kamchatka Peninsula and Sakhalin Island, and in Sakhalin Bay. It was shown that the distributions of the TA and Ca in the water...

According to the results of the international expedition aboard the R/Vs Roger Revelle and Professor Khromov in the summer 1999, areas with low oxygen contents (below 210 μM/kg) and those with increased contents of dissolved inorganic carbon and phosphates were found that roughly coincided with one another. These areas are located near the bottom o...

Seven sediment cores were taken in the Sea of Okhotsk in a south-north transect along the slope of Sakhalin Island. The retrieved anoxic sediments and pore fluids were analyzed for particulate organic carbon (POC), total nitrogen, total sulfur, dissolved sulfate, sulfide, methane, ammonium, iodide, bromide, calcium, and total alkalinity. A novel me...

Two methods, the total alkalinity measurement by Bruevich [4] and pH measurement in a cell without liquid junction [11], were suggested for study of the carbonate system of estuaries. Based on new measurements, the empirical equations were obtained for the first and second seawater concentration constants of carbonic acid for the ranges of salinity...

The weathering of silicate minerals exposed on the continents is the largest sink of atmospheric CO 2 on time scales of millions of years. The rate of this process is positively correlated with global mean temperature and atmospheric CO 2 concentration, resulting in a negative feedback that stabilizes Earths' climate (Berner, 2004). Detrital silica...

Calcium in the Sea of Okhotsk - Sakhalin and Kamchatka slopes, Derugin and Kuril basins and Sakhalinsky Bay - was determined in June-July 2002 during the KOMEX expedition with an error less than 0.1% by the method of Tsunogai. The main features of calcium distribution are following: 1. The average Ca/Cl ratios for the whole water column and for the...

A potentiometric method was developed for pH measurements in seawater by means of a cell without a liquid junction. Within the conventional pH scale by Pitzer (pHc), the standard values p(aH/γNa)S were assigned to three buffered systems: Na2HPO4-NaH2PO4-NaCl-H2O of mHA = mA = 0.025; TRIS-TRISHCl-NaCl-H2O of mTRIS = mTRISHCl = 0.04 for any NaCl mola...

The chemical composition (alkalinity, pH, NH4+, PO43-, Si, H2S, Cl-, Ca2+, and SO42-) of interstitial water was studied in the sediments of the Sea of Okhotsk at sites of methane emission. Variations in alkalinity were observed in the sediments from a typical seawater value (2.3 mM/kg) to 63 mM/kg. It is demonstrated that they are caused by the pro...

The Sea of Japan has experienced fluctuations in bottom-water properties over many time scales. These include increases in temperature and decreases in thickness of the bottom boundary layer and oxygen concentrations. Such temporal variations were thought to be transient and probably caused by a recent reduction or cessation of new bottom-water for...

pH, total alkalinity and dissolved oxygen data for the late-autumn season were collected along a line crossed two major climatic regions of the Japan Sea: warm southeastern area of subtropical waters and cold northwestern area of transformed waters. Below the bentic front at about 2300 m seawater is quite homogenous with NTA = 2.355 +/- 0.003 mg-eg...

The theory of ion interaction (the Pitzer method) is used as a theoretical foundation for the standardization of pH-measurements. Within the framework of this method, the concepts of the conventional and "true" pH scales are developed. It is shown that these scales can be used for pH measurements over a wide range of ionic strengths. The convention...

We here present conductivity-temperature-depth and chemical (CO2, PO4, 02, alkalinity, and pH) observations across an anticyclonic (fresh-core) ring in the Oyashio Current near Bussol Strait, Kuril Islands. These measurements suggest that the core of the ring is a region of enhanced vertical mixing, with attendant effects on both spatial and tempor...

Many attempts have been made to use carbonate characteristics as descriptors of water masses. In the present paper we analyze the relationship between the carbonate and hydrographic characteristics in the data of 7 stations (65 depths) in the northwestern Pacific Ocean. The samples were collected in plastic bottles. The salinity was measured by cou...