A. Khaliulin | Marine Hydrophysical Institute RAS (original) (raw)
Papers by A. Khaliulin
Oceans 2003. Celebrating the Past ... Teaming Toward the Future (IEEE Cat. No.03CH37492), 2003
The Black Sea is a well-investigated marine basin. Since 1980 more than 100,000 oceanographic sta... more The Black Sea is a well-investigated marine basin. Since 1980 more than 100,000 oceanographic stations have been established in it. However, their distribution in time and location is not uniform and the number of observations significantly decreases with depth. Comparisons of climate products obtained from temperature and salinity data at different periods of time are characterized by significant differences. This can be explained by the fact that many results were obtained from a limited and not always comprehensive information set and by the considerable dependence of the results upon the methods of calculation. As is known, until recently, the inter-annual variability of hydrological parameters was not taken into account when calculating climate products. The purpose of this work is to demonstrate a necessity of taking into account the inter-annual variability of hydrological parameters when calculating climatic products.
Oceans 2003. Celebrating the Past ... Teaming Toward the Future (IEEE Cat. No.03CH37492), 2003
In the framework of the Project "Rescue of Black Sea Hydrological Data" collected from more than ... more In the framework of the Project "Rescue of Black Sea Hydrological Data" collected from more than 100,000 Black Sea oceanographic stations from all sources and created a CD-ROM digital atlas "Physical Oceanography of the Black Sea" based on all available, historical hydrological data. For the providing data access and visualization the database management system was developed and included in CD-ROM.
Physical Oceanography, 1997
On the basis of the measurements collected by MHI and other scientific institutions during expedi... more On the basis of the measurements collected by MHI and other scientific institutions during expeditions in various parts of the Black Sea and in various seasons, the variability of the upper boundary of the hydrogen sulphide zone and the respective isopycnic surface is considered, as well as the relationship between the latter parameters and the index of atmospheric circulation. Correlation
Integrated Approach to Environmental Data Management Systems, 1997
Physical Oceanography, 2001
At modern stage of the World Ocean study information support of investigation based on ad-vanced ... more At modern stage of the World Ocean study information support of investigation based on ad-vanced computer technologies becomes of particular importance. These abstracts are devoted to presentation of several data services developed in the Ukrainian NODC on the base of the Ma-rine Environmental and Information Technologies Department of MHI NASU. The Data Quality Control Service Using experience of international collaboration
Information on the depth of the sulfide onset in the Black Sea has been analyzed for the period 1... more Information on the depth of the sulfide onset in the Black Sea has been analyzed for the period 1910-1995. Correlation between the depth of the sulfide onset and the density structure of the layer of the main pycnocline is significant for the entire period covered. Correlation coefficients (R) between the depth of the sulfide onset and the position of isopycnal surfaces in the layer of the main pycnocline vary, on average, 0.71-0.88. The average value of density (σ t ) at the depth of sulfide onset, defined as a sulfide concentration equal to 3 µM, is close to 16.17. Oscillations in the average depth of the sulfide onset range over 24 m and indicate that a steady-state trend does not occur. The period of these oscillations may occur over a century timescale. The dataset for the period 1960-1995 has been used to analyze temporal variations in concentrations of sulfide inside the anoxic zone of the Black Sea. The results of isopycnal analysis demonstrate that possible temporal variations in the average position of sulfide onset versus density (σ t ) scale do not exceed 0.15, which is close to the limit of uncertainties for data obtained before 1988. In contrast, a prominent increase in sulfide concentration, as well as nutrient levels, within the anoxic zone is shown and is related to anthropogenic impact.
Five software products created in the marine research institutes of Ukraine using environmental i... more Five software products created in the marine research institutes of Ukraine using environmental information of the Black Sea and Caspian basin are shortly presented. Two systems: GIS “Hydrometeorology of the Black and Azov Seas” and the Caspian Biodiversity Information System mean for the common functions of treatment of environmental information. Besides they are also able to reveal threats and dangerous phenomena, such as severe storms, freezing, droughts, extreme rises of sea level and biodiversity decline. ...
Estuarine, Coastal and Shelf Science, 2007
in surface winter nutrients and summer oxygen concentration of the euphotic zone, as well as seas... more in surface winter nutrients and summer oxygen concentration of the euphotic zone, as well as seasonal and interannual variability in surface chlorophyll a (chl a) and Secchi depth (Z d ) were investigated for different shelf regions (depth <50 m) of the western Black Sea. Increasing phosphate and nitrate levels and changes in the summer oxygen concentration on the shelf before the mid-1980s corresponded well with the increase in riverine nutrient inputs. At the same time, decreasing silicate levels resulted almost equally from enhanced diatom stripping and trapping of silicate in the numerous dams constructed on the Danube River. The associated decrease in the Si:N ratio caused a shift towards more non-siliceous phytoplankton blooms. A decoupling of winter nutrient levels and summer oxygen concentration on the shelf after the mid-1980s suggests that other sources of inputs, such as regenerated nutrients from shelf sediments and/or upwelling, may have increased substantially. Large variations in the regional climate during the 1980s and 1990s could potentially account for increases from either or both of these sources and the resulting high summer primary production despite decreasing winter nutrients. The seasonal pattern in chl a within the Ukrainian NW shelf is similar to the open Black Sea, with low chl a in summer and high concentrations in cold months. The seasonal chl a variations on the Romanian and Bulgarian shelves also show high concentrations in May/June, most likely related to the Danube River maximum discharge during spring. As a result, chl a annual means in these two regions are significantly higher than e in the Ukrainian NW shelf.
Book of Abstracts
... de Sissy Iona, Hellenic Centre for Marine Research, sissy@ hnodc. hcmr. ... aspx • WDC-MARE: ... more ... de Sissy Iona, Hellenic Centre for Marine Research, sissy@ hnodc. hcmr. ... aspx • WDC-MARE: http://www. wdc-mare. org/data • The organization of data in the sources listed above is generally oriented at long term archiving and free distribution of oceanographic data. ...
Oceans 2003. Celebrating the Past ... Teaming Toward the Future (IEEE Cat. No.03CH37492), 2003
The Black Sea is a well-investigated marine basin. Since 1980 more than 100,000 oceanographic sta... more The Black Sea is a well-investigated marine basin. Since 1980 more than 100,000 oceanographic stations have been established in it. However, their distribution in time and location is not uniform and the number of observations significantly decreases with depth. Comparisons of climate products obtained from temperature and salinity data at different periods of time are characterized by significant differences. This can be explained by the fact that many results were obtained from a limited and not always comprehensive information set and by the considerable dependence of the results upon the methods of calculation. As is known, until recently, the inter-annual variability of hydrological parameters was not taken into account when calculating climate products. The purpose of this work is to demonstrate a necessity of taking into account the inter-annual variability of hydrological parameters when calculating climatic products.
Oceans 2003. Celebrating the Past ... Teaming Toward the Future (IEEE Cat. No.03CH37492), 2003
In the framework of the Project "Rescue of Black Sea Hydrological Data" collected from more than ... more In the framework of the Project "Rescue of Black Sea Hydrological Data" collected from more than 100,000 Black Sea oceanographic stations from all sources and created a CD-ROM digital atlas "Physical Oceanography of the Black Sea" based on all available, historical hydrological data. For the providing data access and visualization the database management system was developed and included in CD-ROM.
Physical Oceanography, 1997
On the basis of the measurements collected by MHI and other scientific institutions during expedi... more On the basis of the measurements collected by MHI and other scientific institutions during expeditions in various parts of the Black Sea and in various seasons, the variability of the upper boundary of the hydrogen sulphide zone and the respective isopycnic surface is considered, as well as the relationship between the latter parameters and the index of atmospheric circulation. Correlation
Integrated Approach to Environmental Data Management Systems, 1997
Physical Oceanography, 2001
At modern stage of the World Ocean study information support of investigation based on ad-vanced ... more At modern stage of the World Ocean study information support of investigation based on ad-vanced computer technologies becomes of particular importance. These abstracts are devoted to presentation of several data services developed in the Ukrainian NODC on the base of the Ma-rine Environmental and Information Technologies Department of MHI NASU. The Data Quality Control Service Using experience of international collaboration
Information on the depth of the sulfide onset in the Black Sea has been analyzed for the period 1... more Information on the depth of the sulfide onset in the Black Sea has been analyzed for the period 1910-1995. Correlation between the depth of the sulfide onset and the density structure of the layer of the main pycnocline is significant for the entire period covered. Correlation coefficients (R) between the depth of the sulfide onset and the position of isopycnal surfaces in the layer of the main pycnocline vary, on average, 0.71-0.88. The average value of density (σ t ) at the depth of sulfide onset, defined as a sulfide concentration equal to 3 µM, is close to 16.17. Oscillations in the average depth of the sulfide onset range over 24 m and indicate that a steady-state trend does not occur. The period of these oscillations may occur over a century timescale. The dataset for the period 1960-1995 has been used to analyze temporal variations in concentrations of sulfide inside the anoxic zone of the Black Sea. The results of isopycnal analysis demonstrate that possible temporal variations in the average position of sulfide onset versus density (σ t ) scale do not exceed 0.15, which is close to the limit of uncertainties for data obtained before 1988. In contrast, a prominent increase in sulfide concentration, as well as nutrient levels, within the anoxic zone is shown and is related to anthropogenic impact.
Five software products created in the marine research institutes of Ukraine using environmental i... more Five software products created in the marine research institutes of Ukraine using environmental information of the Black Sea and Caspian basin are shortly presented. Two systems: GIS “Hydrometeorology of the Black and Azov Seas” and the Caspian Biodiversity Information System mean for the common functions of treatment of environmental information. Besides they are also able to reveal threats and dangerous phenomena, such as severe storms, freezing, droughts, extreme rises of sea level and biodiversity decline. ...
Estuarine, Coastal and Shelf Science, 2007
in surface winter nutrients and summer oxygen concentration of the euphotic zone, as well as seas... more in surface winter nutrients and summer oxygen concentration of the euphotic zone, as well as seasonal and interannual variability in surface chlorophyll a (chl a) and Secchi depth (Z d ) were investigated for different shelf regions (depth <50 m) of the western Black Sea. Increasing phosphate and nitrate levels and changes in the summer oxygen concentration on the shelf before the mid-1980s corresponded well with the increase in riverine nutrient inputs. At the same time, decreasing silicate levels resulted almost equally from enhanced diatom stripping and trapping of silicate in the numerous dams constructed on the Danube River. The associated decrease in the Si:N ratio caused a shift towards more non-siliceous phytoplankton blooms. A decoupling of winter nutrient levels and summer oxygen concentration on the shelf after the mid-1980s suggests that other sources of inputs, such as regenerated nutrients from shelf sediments and/or upwelling, may have increased substantially. Large variations in the regional climate during the 1980s and 1990s could potentially account for increases from either or both of these sources and the resulting high summer primary production despite decreasing winter nutrients. The seasonal pattern in chl a within the Ukrainian NW shelf is similar to the open Black Sea, with low chl a in summer and high concentrations in cold months. The seasonal chl a variations on the Romanian and Bulgarian shelves also show high concentrations in May/June, most likely related to the Danube River maximum discharge during spring. As a result, chl a annual means in these two regions are significantly higher than e in the Ukrainian NW shelf.
Book of Abstracts
... de Sissy Iona, Hellenic Centre for Marine Research, sissy@ hnodc. hcmr. ... aspx • WDC-MARE: ... more ... de Sissy Iona, Hellenic Centre for Marine Research, sissy@ hnodc. hcmr. ... aspx • WDC-MARE: http://www. wdc-mare. org/data • The organization of data in the sources listed above is generally oriented at long term archiving and free distribution of oceanographic data. ...