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Interannual changes of the Arabian Sea productivity Interannual changes of the Arabian Sea productivity

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Date added: 02/08/2012
Date modified: 02/08/2012
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Interannual changes of the Arabian Sea productivity
SERGEY A. PIONTKOVSKI* & MICHEL R. CLAEREBOUDT
Department of Marine Science and Fisheries, Sultan Qaboos University, Al-Khod, Sultanate of Oman

Inter-annual changes in temperature and chlorophyll a across the Arabian Sea (subdivided into 61 2-degree regions) were analysed. For each 2-degree region, from appropriate databases, remotely sensed chlorophyll a, sea surface temperature, and wind speed time series were retrieved. Spatial and temporal trend analysis showed physical- biological oscillations with dominant periods of 12 and 6 months (reflecting the seasonality of monsoonal winds) with a globally warming trend, but no overall increase in chlorophyll during the period 1997- 2009. Variation coefficients of the inter-annual time series of chlorophyll a implied high variability in western regions of the sea in comparison to eastern regions. The basin-wide maps of chlorophyll distribution did not show the enlargement of the productive area over time and overall, not only did the Arabian Sea not get more productive, but several regions in its eastern basin showed a decline in chlorophyll a concentration.

Seasonal and interannual variability of chlorophyll-a in the Gulf of Oman Seasonal and interannual variability of chlorophyll-a in the Gulf of Oman

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Date added: 01/21/2012
Date modified: 01/21/2012
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Seasonal and interannual variability of chlorophyll-a in the Gulf of Oman compared to the open Arabian Sea regions
SERGEY PIONTKOVSKI*, ADNAN AL-AZRI and KHALID AL-HASHMI
Department of Marine Science and Fisheries,
College of Agricultural and Marine Sciences,
Sultan Qaboos University, CAMS, P.O. 34, Al-Khod 123,
Sultanate of Oman

Field sampling, remote sensing and modelling were employed to understand the seasonal and interannual changes of chlorophyll-a concentrations in the Gulf of Oman in comparison to open sea regions. In these regions, maximal chlorophyll concentrations were reported during the summer monsoon (with peaks in June and August), while in the Gulf of Oman, the chlorophyll maximum was observed during the winter monsoon (February–March). From 1997 through to 2008, the interannual variability in chlorophyll-a concentrations in the Gulf of Oman has not exhibited pronounced trends and neither have the other two (oceanic) regions in the western Arabian Sea. However, an increase of the annual variation in chlorophyll concentrations over the years was noticed. The diatom biomass decreased two-fold from 1997 to 2007. Nitrate concentration and mixed-layer depth also declined. In comparison to the seasonal blooms driven in the Gulf of Oman by the dinoflagel- late Noctiluca scintillans, the year 2008 was markedly different. The summer bloom was shifted to September; it was gradually extended in time and formed by the other species. An applicability of the concept of ecosystem regime shift is discussed.

Mesoscale Structure of the Epipelagic Ecosystem of the Open Northern Arabian Sea Mesoscale Structure of the Epipelagic Ecosystem of the Open Northern Arabian Sea

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Date added: 01/08/2011
Date modified: 01/08/2011
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Mesoscale Structure of the Epipelagic Ecosystem of the Open Northern Arabian SeaMesoscale Structure of the Epipelagic Ecosystem of the Open Northern Arabian Sea
Banse, Karl & Piontkovski, S.A.
2006; 248 pp; Paperback; ISBN: 978-81-7371-496-2
This book treats principally the thirtieth cruise of R/V Professor Vodyanitsky of the Institute of Biology of Southern Seas (IBSS) in February–April 1990, the last comprehensive Ukrainian expedition to the Arabian Sea.
Since the conclusion of the International Indian Ocean Expedition in 1965, nine expeditions to the Arabian Sea and adjacent equatorial waters had been launched by IBSS (1978–1990) and ten by the Marine Hydrophysical Institute (MHI, 1966, 1971–1991).
While the book emphasizes the 1990 results, several authors also review in detail, or newly present, data from earlier expeditions. Some of the papers expand on presentations during the United States–Commonwealth of Independent States Arabian Sea Workshop held in Sevastopol in September 1993.
http://www.universitiespress.com/display.asp?categoryID=1&isbn=978-81-7371-496-2

Seasonal Changes of Chlorophyll a and Environmental Characteristics in the Sea of Oman Seasonal Changes of Chlorophyll a and Environmental Characteristics in the Sea of Oman

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Date added: 12/31/2010
Date modified: 01/04/2011
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Al-Hashmi, Khalid A. Claereboudt*, Michel R. Al-Azri, Adnan, R. Piontovski, Sergey. A.
Sultan Qaboos University, Department Marine Science and Fisheries College Agricultural and Marine Sciences, Box 34
Al-Khod 123 Sultanate of Oman

Monthly estimates of chlorophyll a, temperature, salinity, and nutrients were collected through sampling at two stations from January 2001 to January 2002, in and near Bandar Al-Khyran, the largest semi-enclosed bay on the southern coast of the Sea of Oman.

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