Influence of northeasterly trade winds on intensity of winter bloom in the Northern Arabian Sea

Chlorophyll and wind pattern retrieved from remote sensing data have been used to study biological activity in the oceanic waters of Northern Arabian Sea (NAS) during February–March 2002–05. Occurrence of algal bloom in these waters during this period was noticed with the help of ship observations i...

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Veröffentlicht in:	Current Science. - Current Science Association. - 90(2006), 10, Seite 1397-1406
1. Verfasser:	Dwivedi, R. M. (VerfasserIn)
Weitere Verfasser:	Raman, Mini, Parab, Sushma, Matondkar, S. G. P., Nayak, Shailesh
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2006
Zugriff auf das übergeordnete Werk:	Current Science
Schlagworte:	Biological sciences Physical sciences Environmental studies Business Applied sciences


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100	1		\|a Dwivedi, R. M. \|e verfasserin \|4 aut
245	1	0	\|a Influence of northeasterly trade winds on intensity of winter bloom in the Northern Arabian Sea
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520			\|a Chlorophyll and wind pattern retrieved from remote sensing data have been used to study biological activity in the oceanic waters of Northern Arabian Sea (NAS) during February–March 2002–05. Occurrence of algal bloom in these waters during this period was noticed with the help of ship observations in the past. The same was detected from OCEANSAT I/OCM with time series chlorophyll images for January–March 2000. Occurrence of this bloom was later re-confirmed using OCM data in the subsequent years also. The time-series chlorophyll images established that the bloom develops every year during February–March. This period happens to coincide with the presence of northeasterly trade winds over the NAS. Two ship cruises were conducted with the help of research vessels FORV Sagar Sampada (SS-212 during 26 February–7 March 2003 and SS-222 during 21 February–11 March 2004) during this period at the bloom site. The aim was species identification of the bloom and to study various environmental parameters associated with the bloom. Two diverse situations in the context of biological activity were observed while collecting in situ data in 2003 and 2004. Distribution of the bloom was found uniform over a large area and concentration of phytoplankton was relatively higher in 2003. Compared to this, it was observed during the same period in 2004 that phytoplankton was distributed in scattered and small patches and its concentration was relatively less. Corresponding to this observation, it was noticed from the ship data that wind strength was significantly weaker and the oceanic waters were less turbulent in 2004 compared to the same in 2003. In light of this elementary observation, an attempt was made to observe variations in the wind pattern during 2003 and 2004 using QuikSCAT/Sea Winds scatterometer data. It could be established that occurrence of the bloom as well as the observed inter annual variability in chlorophyll pattern were coupled with prevailing trade winds. It was found that density of surface water increased (inversion) during this period, which could result in convective action and the observed bloom. The vertical density gradient revealed an increasing pattern with increase in wind speed. Moreover, it was observed that response of chlorophyll to acting wind force is delayed by one to two weeks. This led to an important inference that wind can be treated as a precursor to predict variations in chlorophyll pattern in the context of the observed event of the bloom.
540			\|a © 2006 Current Science Association
650		4	\|a Biological sciences \|x Biochemistry \|x Biomolecules \|x Biological pigments \|x Chlorophylls
650		4	\|a Physical sciences \|x Physics \|x Mechanics \|x Classical mechanics \|x Kinetics \|x Linear dynamics \|x Velocity \|x Wind velocity
650		4	\|a Physical sciences \|x Earth sciences \|x Hydrology \|x Limnology \|x Surface water
650		4	\|a Environmental studies \|x Environmental quality \|x Environmental degradation \|x Algal blooms
650		4	\|a Business \|x Industry \|x Industrial sectors \|x Service industries \|x Transportation industries \|x Travel industry \|x Tourism \|x Cruises
650		4	\|a Physical sciences \|x Earth sciences \|x Hydrology \|x Water \|x Saltwater \|x Sea water
650		4	\|a Applied sciences \|x Engineering \|x Transportation \|x Vehicles \|x Watercraft \|x Ships
650		4	\|a Physical sciences \|x Earth sciences \|x Geography \|x Geomorphology \|x Bodies of water \|x Seas
650		4	\|a Business \|x Business economics \|x Commercial production \|x Productivity
650		4	\|a Environmental studies \|x Atmospheric sciences \|x Atmospheric physics \|x Atmospheric circulation \|x Wind \|x Trade winds \|x RESEARCH COMMUNICATIONS
655		4	\|a research-article
700	1		\|a Raman, Mini \|e verfasserin \|4 aut
700	1		\|a Parab, Sushma \|e verfasserin \|4 aut
700	1		\|a Matondkar, S. G. P. \|e verfasserin \|4 aut
700	1		\|a Nayak, Shailesh \|e verfasserin \|4 aut
773	0	8	\|i Enthalten in \|t Current Science \|d Current Science Association \|g 90(2006), 10, Seite 1397-1406 \|w (DE-627)320574393 \|w (DE-600)2016870-6 \|x 00113891 \|7 nnns
773	1	8	\|g volume:90 \|g year:2006 \|g number:10 \|g pages:1397-1406
856	4	0	\|u https://www.jstor.org/stable/24091991 \|3 Volltext
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