Hydro-Optical Studies of the Black Sea: History and Status

Vladimirov, V. L.; Mankovsky, V. I.; Solov'ev, M.V.; Mishonov, Alexey V.; Beşiktepe, Şükrü

doi:10.1007/978-94-011-4568-8_14

Cited by 2 publications

(4 citation statements)

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“…The seasonal variations in the profile characteristics were investigated for nitrate only, since the chl a profiles were relatively constant in the warm months (Yunev 1994). Z d data were similarly averaged for the quasi-stationary warm months of May to September based on the results from Mankovsky et al (1996) and Vladimirov et al (1999).…”

Section: Chlmentioning

confidence: 99%

“…Secchi depth is an indirect indicator of eutrophication in the open Black Sea, because variation in light attenuation is largely related to changes in phytoplankton biomass, size distribution, and species composition (Falkowski & Wilson 1992, Mankovsky et al 1996, Sanden & Hakansson 1996, Vladimirov et al 1999, Nielsen et al 2002. In recent decades changes in nutrient ratios and related effects on the phytoplankton community composition have been also documented (Conley et al 1993, Dortch et al 2001, Rousseau et al 2002.…”

Section: Other Effects Of Eutrophicationmentioning

confidence: 99%

“…5A-C,E) have been considered signs of an improved ecological state (e.g. Konovalov et al 1999b, Petranu et al 1999, Vladimirov et al 1999. The recent findings of Konovalov & Murray (2001), however, provide new important insight for understanding the recent state of the Black Sea.…”

Section: Other Effects Of Eutrophicationmentioning

confidence: 99%

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Long-term variability of vertical chlorophyll a and nitrate profiles in the open Black Sea: eutrophication and climate change

Yunev¹,

Moncheva²,

Carstensen³

2005

Mar. Ecol. Prog. Ser.

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The objective of this study was to investigate long-term trends in the subsurface summer phytoplankton community and their underlying mechanisms in relation to nutrient enrichment of the open Black Sea. We analysed parameters describing the summer chlorophyll a (chl a) and annual mean nitrate depth distribution in terms of their maximum concentration and its depth, the mean nitrate gradient for the layer between the 2 maxima, and Secchi depth. Investigating the entire period from 1964 to 1996 did not reveal any direct relationship between the nitrate and phytoplankton levels. The nitrate level in the open Black Sea increased until 1984/85, corresponding with general increases in anthropogenic riverine nutrient inputs to the sea. Thus, the average maximum nitrate concentration and the nitrate gradient for all depth profiles increased between 1969 and 1984 and then remained constant. Despite the early increase in nitrate characteristics, the maximum in the chl a profile remained unaltered from 1964 to 1984. After the mid-1980s, the magnitude of the chl a profile gradually increased to 1991 and peaked with an exceptionally high concentration in 1992. In this same period there were only moderate fluctuations in the nitrate profile characteristics. The change of the summer phytoplankton biomass levels since 1984/85 coincided with an intensification of the Rim Current and the associated transport of nitrate to the euphotic zone. Prior to 1984/85 strong stratification and a deep halocline resulted in nitrate accumulation only, whereas uplifting of the halocline, combined with intensified advective currents, increased the transport of nitrate to the euphotic zone during the summer. This resulted in an associated increase in phytoplankton production and biomass in the following period. While this study shows that the open Black Sea, like the coastal regions, has been impacted by eutrophication, the response is different from the coastal region due to the different physical characteristics of the open waters.

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Section: Chlmentioning

confidence: 99%

Section: Other Effects Of Eutrophicationmentioning

confidence: 99%

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Long-term variability of vertical chlorophyll a and nitrate profiles in the open Black Sea: eutrophication and climate change

Yunev¹,

Moncheva²,

Carstensen³

2005

Mar. Ecol. Prog. Ser.

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“…Bukata et al have found a very high correlation between the total attenuation coefficient c and seiche depth D s for some locations at Great Lakes. Vladimirov et al (1999) have used seiche depth D s in certain depth ranges to estimate the bio-optical parameters, i.e., the mean value of beam attenuation coefficient and the mean value of vertical attenuation coefficient for the Black Sea. The correlation coefficients by their estimates are about 0.81.…”

Section: Introductionmentioning

confidence: 99%

The light transmission and seiche depth of Izmir Bay, western Turkey

2007

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Izmir Bay is one of the most polluted estuaries in the whole Mediterranean Sea. The inner part of the Bay (Inner Bay) is heavily affected by domestic and industrial discharge. As a result of these loads, strong eutrophication occurs in the Inner Bay, which is temporally anaerobic. The ecologically sensitive approach of the local authorities during the last decade has given rise to a wide variety of monitoring and research studies on this bay. On the other hand, the municipality of Izmir started to operate wastewater treatment facilities since January 2000. The Institute of Marine Sciences and Technology -Izmir (IMST) with its research vessel R/V K Piri Reis has been conducting an intensive monitoring program since 1988 and especially during the recent few years. These investigations provide an opportunity for the evaluation of the performance of the wastewater treatment plant in terms of the change in the optical properties of Izmir Bay water in a positive manner. The turbidity values measured in these monitoring studies indicate that the values have changed drastically after January 2000. Their spatial variation indicates that the values decrease from the Inner Bay towards the Aegean Sea. The turbidity (light transmission) values are measured with an automatic CTD (conductivity, temperature and depth) system during each cruise. The seiche disc depth measurement is carried out only occasionally. The accuracy of the seiche disc depth is dependent on certain daylight conditions and depends on the operator. The seiche disc depth (D s ) is an important parameter to estimate primary production of organic matter (hereafter called production). A relation between light transmission (turbidity) value and seiche disc depth (D s ) is found with very good agreement. The correlations are very high (approximately 0.94) with slight seasonal variation.

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Hydro-Optical Studies of the Black Sea: History and Status

Cited by 2 publications

References 1 publication

Long-term variability of vertical chlorophyll a and nitrate profiles in the open Black Sea: eutrophication and climate change

Long-term variability of vertical chlorophyll a and nitrate profiles in the open Black Sea: eutrophication and climate change

The light transmission and seiche depth of Izmir Bay, western Turkey

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