Surface chlorophyll in the Black Sea over 1978–1986 derived from satellite and in situ data

Kopelevich, O. V.; Sheberstov, S. V.; Yunev, Oleg A.; Baştürk, Özden; Финенко, З. З.; Nikonov, S.; Vedernikov, V. I.

doi:10.1016/s0924-7963(02)00184-7

Cited by 46 publications

(28 citation statements)

References 9 publications

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“…The satellite data also show a gradual decrease along the periphery from the northwest shelf zone toward the south. After 'recalibration' of satellite data with in situ Black Sea data (Kopelevich et al 2002), the mean summer chl a level in the northwestern and western interior shelf was seen to be 13 to 14 times higher than in the open parts, and about 8 times higher than in the eastern shelf-slope.…”

Section: Methodsmentioning

confidence: 98%

“…1A). These regions were designated on the basis of basin bathymetry, the scheme of the surface currents, the surface chl a maps constructed by using the Nimbus-7 CZCS data for 1978 to 1986, and actual observations of anthropogenic impacts on the shelf areas (Mee 1992, Zaitsev 1993, Sur et al 1994, 1996, Cociasu et al 1996, Ozsoy & Unluata 1997, Cokacar & Ozsoy 1998, Kopelevich et al 2002.…”

Section: Methodsmentioning

confidence: 99%

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Long-term variations of surface chlorophyll a and primary production in the open Black Sea

Yunev¹,

Vedernikov²,

Baştürk³

et al. 2002

Mar. Ecol. Prog. Ser.

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Extensive data sets on surface chlorophyll a (chl a), depth-integrated primary production (DIPP) and phosphate (PO 4 , µM) averaged for the upper 25 m layer in 1964, 1973, 1978 and for a period (1980 to 1996) of regular measurements have been used to evaluate long-term changes in the upper portion of the euphotic layer of the entire open (>1000 m) Black Sea. After preliminary analysis of seasonal dynamics, special attention was given to data obtained during those periods of the year with relatively stable values, revealing interannual and long-term fluctuations and trends. Of 2 phytoplankton characteristics (chl a and DIPP), long-term trends were obtained only for chl a since only these data covered the entire open sea and all periods investiged. A positive correlation was found between DIPP (using 2 different 14 C methods: actual in situ and simulated in situ) and the more numerous chl a data for different monthly intervals, with significant correlation coefficients (r = 0.51 to 0.82). This means that the observed patterns in long-term variability for chl a may be valid also for DIPP. The results show that interannual fluctuations in chl a are more pronounced during the warm months, from approximately May to September. Chl a levels within this interval were moderate, with a mean of 0.15 ± 0.04 mg m -3 during the first 'quiet' period (1964 to 1986), but increased steadily at a rate of 0.06 mg m

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Section: Methodsmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

Long-term variations of surface chlorophyll a and primary production in the open Black Sea

Yunev¹,

Vedernikov²,

Baştürk³

et al. 2002

Mar. Ecol. Prog. Ser.

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“…Recently, additional summer blooms of dinoflagellates and coccolithophorids (mainly Emiliana huxleyi) have frequently been reported (Hay et al, 1990;Sur et al, 1996;Yilmaz et al, 1998;Yayla et al, 2001). The most important changes in the Black Sea ecosystem recorded over the last decade are changing of the ratio of major phytoplankton groups (Bat et al, 2011;BSC 2008;Feyzioglu and Seyhan, 2007) resulted from the deterioration of the Black Sea ecosystem (Kideys, 2002;Kopelevich et al, 2002).…”

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confidence: 99%

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Ağırbaş¹,

Feyzioglu²,

Kopuz³

2014

Turk. J. Fish. Aquat. Sci.

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“…Since then, many studies related to or directly examining monthly, seasonal and interannual changes in Chl a levels have been carried out in different regions of the open and coastal Black Sea waters (Vedernikov et al, 1983;Yunev et al, 1987;Vedernikov, 1989;Yunev, 1989;Krupatkina et al, 1991;Finenko andKrupatkina, 1993, Vedernikov andDemidov, 1993;Yilmaz et al, 1998;Demidov, 1999;Kopelevich et al, 2002;Alkan et al, 2013). Despite these numerous measurements, there are no data on long-term variations in chlorophyll in the shallow regions of the Black Sea, especially at the southeastern region.…”

Section: Introductionmentioning

confidence: 99%

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Edi̇ger¹,

Beken²,

Feyzioglu³

et al. 2015

Turk. J. Fish. Aquat. Sci.

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Benthic macroinvertebrates, macroalgae and phytoplankton constitute the Biological Quality Elements (BQE) proposed in the Water Framework Directive (WFD, 2000/60/EC) to be used for the classification of the ecological status of a water body.Chlorophyll-a is a usefull expression of phytoplankton biomass and this indicator is an effective and relevant BQE for coastal ecosystems which is universally accepted. In the present study, interpretations of the class boundaries according to normative definitions of WFD, are presented for chlorophyll-a in South Eastern (SE) Black Sea. Water quality classification was determined in five different categories as "high, good, moderate, poor and bad". The coastal waters of SE Black Sea were classified in 8 different typologies (K1-K8) based on depth, salinity and substratum types. In this study, types K1 and K2 (>17.5 salinity, >30 m depth) were considered because of availability of time-series data for those typologies. Sinop and Sürmene sites were selected due to the best available long-term chlorophyll-a data set, respectively over the period of 2002-2010 and 2001-2011 for chlorophyll-a respectively. Type specific chlorophyll-a (Chl-a) reference and threshold values were determined based on the 90th percentile of the long-term collected chlorophyll data set. Due to the high seasonal variability of phytoplankton biomass, the annual values were not considered adequate and the classification tool was developed on seasonal basis. The High/Good (H/G) and Good/Moderate (GM) boundaries were defined as seasonal from the long term data sets for Sürmene and Sinop sites. All the boundaries were higher at the Sinop site.Ecological quality ratios distributed between 0-1. It would be necessary to underline the fact that these class boundaries might be higher for waters where depths are below 30 m and salinity values are less than 17.5. However, there is not enough data to support this assumption for the near coast waters of the SE Black Sea. Eventhough Chl-a scaling can not be used as a single tool for the ecological quality classification it is a reliable approach to use the obtained boundaries at temporal and spatial scales for the quality classification of SE Black Sea waters above 30 m depth.

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Surface chlorophyll in the Black Sea over 1978–1986 derived from satellite and in situ data

Cited by 46 publications

References 9 publications

Long-term variations of surface chlorophyll a and primary production in the open Black Sea

Long-term variations of surface chlorophyll a and primary production in the open Black Sea

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