Intraannual and long-term variations of the carbonate system of the aerobic zone in the black sea

Moiseenko, O. G.; Konovalov, Sergey; Kozlovskaia, Ol’ga N.

doi:10.1007/s11110-011-9097-3

Cited by 3 publications

(4 citation statements)

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“…The more important issue consists in increase of TA in this transition zone in 1998-2011 by approximately 0.04 mg-eq/l that exceeds the abovedefined method error which is 0.4 %. The reason of such a growth is, most likely, the pH decrease in the transition zone during past 20 years [13] that made the carbonate system equilibrium drift to the left:…”

Section: Datementioning

confidence: 99%

“…As for the reason for the pH decrease, proceeding from [13], it is related to increase of the organic substance content on the boundary of the hydrogen sulfide zone.…”

Section: Datementioning

confidence: 99%

“…At the same time, TA remains invariable since the СО2 admission and removal do not affect it directly (equation (1)). Constancy of the alkalinity value was discussed in [13] as a proof of this statement, whereas its formation and long-term variations of its distribution in the Black Sea waters were examined neither in this paper nor in other publications.…”

mentioning

confidence: 94%

“…The problems of intra-annual and long-term changes in the carbonate system of the Black Sea aerobic zone in 1932-1933 were considered in [13] which showed the changes both in the pH distribution and in the carbonate system state (primarily, in content of free carbon dioxide СО2). The intra-annual changes in the carbonate system state are explained, first of all, by influence of the seasonal temperature variation upon the СО2 solubility (similar to temperature dependence of the oxygen (and other gases) solubility [14]), and by seasonal changes of intensity of production and destructive processes regulating direction of transition between the carbon of СО2 and the carbon of organic matter.…”

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confidence: 99%

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Total Alkalinity and pH in the Black Sea Waters in 2010-2011

Кондратьев¹,

Medvedev²,

Konovalov³

2017

PhO

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Based on the data of the expeditionary researches of Marine Hydrophysical Institute in 2010-2011, the total alkalinity TA and pH distributions in the Black Sea waters including the Danube estuary region and the changes in the TA vertical distribution since 1988 are analyzed. It is shown that the coastal and deep-sea water TA is strongly influenced by the river flow. In the Black Sea aerobic zone, TA does not change virtually with depth and does not depend on pH. In the anaerobic zone, it weakly depends on pH, but its dependence on the hydrogen sulfide concentration is of a linear character.Comparison with the data obtained in 1988 shows that in course of the last 20 years no noticeable changes in the TA values in the Black Sea aerobic and anaerobic zones took place, whereas on the sulfide zone upper boundary the total alkalinity increased by 0.04 mg-eq*l -1 .Keywords: total alkalinity, pH, aerobic and anaerobic waters, the Black Sea coastal and deep-sea areas. Introduction. In course of the whole period of hydrochemical studies in the World Ocean, a few tens of definitions of the term "seawater alkalinity" have been proposed [1]. It is explained by the fact that this parameter is a complex function of the contents of several components which are, in most cases, not conservative. In other words, relative abundance (in relation to the salinity value) of different components varies in a different manner. At the same time, importance of this parameter for assessing the marine environment state explains constant attention of the oceanographers studying both distribution and nature of this index. Moreover, in course of the last decade the parameter acquired a special significance due to its stupendous role in regulating the processes conditioning the СО2 flows on the atmosphere-ocean boundary and also the carbon cycle in the marine environment.According to [2], the seawater alkalinity is treated as the value characterizing predominance of the "base efficiency" over the "acid efficiency". Having been examined, balance of the charges shows that the sum of the weak acids (carbonic, boric, phosphoric, silicic etc.) anions in seawater basically equalizes excess of the conservative cations ([Na

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Section: Datementioning

confidence: 99%

“…As for the reason for the pH decrease, proceeding from [13], it is related to increase of the organic substance content on the boundary of the hydrogen sulfide zone.…”

Section: Datementioning

confidence: 99%

mentioning

confidence: 94%

mentioning

confidence: 99%

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Total Alkalinity and pH in the Black Sea Waters in 2010-2011

Кондратьев¹,

Medvedev²,

Konovalov³

2017

PhO

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Studying of the Satellite Based Models for Local Spatio-Temporal Monitoring of Ocean Acidification in Costal Sea Water in Black Sea

Drumeva,

Chanev

2023

EEEP

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Due to climate changes, a number of changes are observed in the world's oceans, such as a change in the amount of thermal energy and water temperature, a change in sea and ocean currents, as well as an increase in acidification. These changes lead to a change in sea water as a habitat for marine ecosystems. Since the beginning of the new millennium, many scientific researches have been focused on monitoring and studying ocean acidification as an important indicator of climate change. The use of satellite remote sensing data to study ocean acidification is gaining wide application and is emerging as a major research method in the near future. It enables continuous near-real-time monitoring, both globally and regionally. The aim of the present study is to investigate and evaluate the possibilities of applying the models for the study of marine acidification using satellite data for a limited coastal area in the Black Sea region. A review of the publications in various scientific databases related to the major projects of international and governmental organizations such as UNESCO, IALA, EC, NOAA, etc. was made. The study takes into account the gaps in the information on the acidification of the Bulgarian coastal waters by exploring the possibilities for satellite remote monitoring, which would allow the creation of spatio-temporal and prognostic models. The global and regional coastal studies of seawater acidification with satellite data, as well as the satellite studies of the Black Sea carried out so far, give us hope that in the near future we will be able to successfully apply satellite remote sensing methods in regions such as the Bulgarian coast. However, there are currently no data on quantitative analyzes based on satellite data for the Black Sea, such as the calculations of the parameters of the carbon cycle in sea water. This leads to the impossibility of conducting satellite monitoring of acidification in our region at the present time.

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