Interannual variability of the early summer coccolithophore blooms in the Black Sea: impacts of climatic factors

Date

2003-08-06

Author

Cokacar, T
Oguz, T
Kubilay, N

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

189
views

0
downloads

Interannual variability of the early summer (May-June) coccolithophore blooms within surface waters of the Black Sea was studied by means of satellite-based bio-optical observations. The performance of two coccolithophore detection algorithms were tested for Black Sea conditions, and were found to provide comparable spatial patterns consistent with the corresponding true color images. An analysis of six, year-long OCTS and SeaWiFS imagery from 1997 onwards points to the presence of a major phytoplankton bloom in every early summer season. Blooms are dominated by densely populated coccolithophore algae within the entire basin, except during 2001. In the early summer of 2001, the coccolithophore activity was limited to the northeastern coastal zone, and the bloom in the rest of the basin was formed by non-coccolithophore groups, as suggested by their relatively strong chlorophyll signature. More coccolithophore over, limited coccolithophore abundance noted in the historical CZCS data suggests substantial differences in terms of spatial coverage and total biomass from the early 1980s to the late 90s. The increasing contribution of coccolithophores to the early summer phytoplankton community structure during the last decade is also consistent with the current view of dramatic shifts in taxonomic composition from diatoms to coccolithhophores and flagellates, as a part of transformations that took place in the Black Sea biogeochemistry and ecosystem structure under changing anthropogenic and climate forcing during the 1980s and 1990s, respectively.

Subject Keywords

Black Sea, Coccolithophore, SeaWiFS, Chlorophyll

URI

https://hdl.handle.net/11511/66814

DOI

https://doi.org/10.1117/12.509816

Collections

Graduate School of Marine Sciences, Conference / Seminar

Suggestions

OpenMETU
Core

Satellite-detected early summer coccolithophore blooms and their interannual variability in the Black Sea Cokacar, T; Oguz, T; Kubilay, N (Elsevier BV, 2004-08-01) Interannual variability of the prevalent early summer coccolithophore blooms within surface waters of the Black Sea was studied by means of satellite-based bio-optical observations. Two coccolith detection algorithms, tested for the Black Sea conditions, were found to provide comparable spatial coccolith patterns consistent with the corresponding true color images. Reliability of the algorithms is also supported by several sets of time-series measurements in different parts of the basin. An analysis of 6 ye...
Distribution of phytoplankton in the southern Black Sea in summer 1996, spring and autumn 1998 Eker-Develi, E; Kıdeyş, Ahmet Erkan (2003-03-01) The species composition, abundance, and biomass of micro- (>15 mum) and nano- (<15 mu m) phytoplankton were studied along the southern Black Sea during June-July 1996 and March-April and September 1998. A total of 150 species were identified, similar to 50% of them being dinoflagellates. The average total phytoplankton abundance changed from 77 x 10(3) Cells l(-1) in spring to 110 x 10(3) cells l(-1) in autumn and biomass from 250 mu g l(-1) in summer to 1370 mu g l(-1) in spring. Based on the extensive sam...
Pigment signatures reveal temporal and regional differences in taxonomic phytoplankton composition off the west coast of Ireland Ediger, D; Raine, R; Weeks, AR; Robinson, IS; Sagan, S (2001-08-01) The composition of phytoplankton assemblages in April, 1998 in Galway Bay and during a summer phytoplankton bloom occurring southwest of Ireland in August, 1998, was characterized by pigments measured by high-performance liquid chromatography. Pigment data reflecting phytoplankton assemblages dominated by diatoms in Galway Bay and dinoflagellates in the southwest of Ireland were compared to phytoplankton cell counts. Significant relationships were found between the fucoxanthin concentrations and the diatom ...
Seasonal Changes in the Composition and Abundance ofZooplankton in the Seas of the Mediterranean Basin Kovalev, Av; Mazzocchı, Mg; Toklu Alıçlı, Benin; Skryabın, Va; Kıdeyş, Ahmet Erkan (2003-01-01) Seasonal changes in the composition, abundance and biomass of zooplankton in the seas of the Mediterranean basin (the Mediterranean, Black and Azov seas) have been reviewed using our own data and data from the literature. In the deep-water central regions of the seas, the seasonal cycle of zooplankton abundance is characterised by one maximum occurring in spring or summer. In the coastal regions, two to three peaks (spring, summer and autumn) exist for the zooplankton abundance. The amplitude of seasonal fl...
Estimation of phytoplankton biomass using HPLC pigment analysis in the southwestern Black Sea Ediger, D.; Soydemir, N.; Kıdeyş, Ahmet Erkan (2006-01-01) The phytoplankton population of the southwestern Black Sea in May 2001 was studied by taxonomic analysis using microscopic examination and by pigment analyses using high-performance liquid chromatography (HPLC). Pigment data, which identified phytoplankton assemblages dominated by dinoflagellates, diatoms and coccolithophores in May 2001, were compared to phytoplankton cell counts and biomass. There were significant (p < 0.002-0.01, r=0.56-0.67) relationships between the taxon-specific pigment concentration...

Citation Formats

T. Cokacar, T. Oguz, and N. Kubilay, “Interannual variability of the early summer coccolithophore blooms in the Black Sea: impacts of climatic factors,” 2003, vol. 5155, p. 190, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/66814.