Biogeochemistry of the Bay of Bengal: physical, chemical and primary productivity characteristics of the central and western Bay of Bengal during summer monsoon 2001

Madhupratap, M.; Gauns, Mangesh; Ramaiah, N.; Kumar, Sanjeev; Muraleedharan, P.M.; Sousa, S. N. De; Sardessai, S.; Muraleedharan, Usha Devi

doi:10.1016/s0967-0645(02)00611-2

Cited by 273 publications

(163 citation statements)

References 21 publications

(14 reference statements)

Supporting

Mentioning

141

Contrasting

Unclassified

Order By: Relevance

“…In an earlier study Murty et al (2000) reported the depth of the SCM in the open-sea region of the Bay of Bengal between 50 and 100 m based on May-June 1996 measurements. However, their chlorophyll a concentrations were extremely low compared to earlier measurements (Radhakrishna et al, 1982, Devassy et al, 1983Sarma and Kumar, 1991;Prasanna Kumar et al, 2002;Madhupratap et al, 2003), especially in the SCM, where they were ~0.1 mg/m 3 .…”

Section: Discussioncontrasting

confidence: 56%

“…However, recent measurements using clean techniques (Madhupratap et al, 2003) corroborate the traditional concept that the Bay of Bengal is a region of lesser biological productivity. The reason for this is variously attributed to cloud cover, large sediment load, narrow shelf, stratification, etc (see Qasim, 1977;Sengupta et al, 1977;Radhakrishna, 1978;Gomes et al, 2000).…”

Section: Introductionmentioning

confidence: 81%

“…Details of these measurements are reported in Madhupratap et al (2003). Briefly, water samples collected at pre-dawn from eight discrete depths (near surface, 10, 20, 40, 60, 80, 100 and 120 m) by the CTD rosette sampler were used for measuring primary production (PP).…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Eddy-mediated biological productivity in the Bay of Bengal during fall and spring intermonsoons

Kumar

Murukesh

Ramaiah

et al. 2007

Deep Sea Research Part I: Oceanographic Research Papers

177

View full text Add to dashboard Cite

The signature of cold-core eddies and their role in altering the biological productivity of the Bay of Bengal was examined using two recent sets of hydrographic data collected along the central and western Bay of Bengal during fall (14 September -12 October, 2002) and spring (12 April -7 May, 2003) intermonsoons under the Bay of Bengal Process Studies (BOBPS) programme. Based on the thermohaline structure and the satellite-derived sea-level anomaly maps 9 cyclonic eddies were identified. Out of this, 4 cyclonic eddies -2 each along the central Bay and along the western boundary -occurred during fall intermonsoon 2002, while 5 occurred -3 along the central Bay and 2 along the western boundary -during spring intermonsoon. The eddy depressed the temperature, which varied from 3 o C to 7 o C at 120 m depth. Maximum depression of temperature was associated with spring-time eddies in the northern Bay, where subsurface stability was low. The reduced water column stability in spring leads to greater eddypumping, thereby cooling the water to a greater extent. However, the cyclonic eddies were unable to break the stratification of the top 20m layer, thereby curtailing their effects below this depth during both seasons. Eddypumping not only cooled the water column but also enhanced the nutrient concentrations. This in turn increased the biological productivity of the Bay to 1½-2 times. In addition, the subsurface chlorophyll maximum (SCM), which is generally located between 40 and 70 m in fall and 60 and 90 m in spring intermonsoons, shallowed under the influence of the eddies and also enhanced the chlorophyll concentration in the SCM to more than double. Thus, eddy-pumping of nutrients controls the biological productivity of the Bay of Bengal during both the seasons. In the fall intermonsoon, however, the riverine input of nutrients and sediments in the northern Bay also plays a role in altering the biological productivity. This has an overall implication to the basin-wide new production and export flux and, at least partly, resolves the reason for the comparable annual fluxes of organic carbon

show abstract

Section: Discussioncontrasting

confidence: 56%

Section: Introductionmentioning

confidence: 81%

See 1 more Smart Citation

Eddy-mediated biological productivity in the Bay of Bengal during fall and spring intermonsoons

Kumar

Murukesh

Ramaiah

et al. 2007

Deep Sea Research Part I: Oceanographic Research Papers

177

View full text Add to dashboard Cite

show abstract

“…In the northern Indian Ocean, primary production in the bright upper ocean is mainly limited by the availability of DIN (Prasarmakumar et al, 2002;Madhupratap et al, 2003). Since the contribution of DIN by atmospheric deposition is relatively less in the northern Indian Ocean (Srinivas et al, 2011;Singh et al" 2012), the riverine DIN input to this area is important for primary production.…”

Section: Nitrogen In Coastal/marine Habitats and Food Websmentioning

confidence: 99%

Reactive Nitrogen in Coastal and Marine Waters of India and Its Relationship With Marine Aquaculture

Prema

Singh

Jeyabaskaran

et al. 2017

The Indian Nitrogen Assessment

View full text Add to dashboard Cite

“…There are numerous studies describing the physical, chemical and biological characteristics of the Bay of Bengal (Kumar et al 2002;Madhupratap et al 2003;Kumar et al 2004). In contrast, only a few studies have focused their attention on the characterization of organic matter with particular reference to the bulk parameters such as organic carbon, nitrogen, carbohydrates and proteins in the Bay (Nandakumar et al 1987;Bhosle and Dhople 1988;Bhosle et al 1992;Unger et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Amino sugars in suspended particulate matter from the Bay of Bengal during the summer monsoon of 2001

et al. 2006

View full text Add to dashboard Cite

Amino sugars (AS) are important constituents of organic matter. However, very little is known about their cycling in marine waters. In this research, we assessed the distribution and cycling of these compounds in waters of the Bay of Bengal. For this purpose, samples of suspended particulate matter (SPM) were collected from 8 depths (surface to 1000 m) at 6 locations during the 166th cruise of the ORV Sagar Kanya in the Bay of Bengal in July/August 2001. The SPM samples were analysed for particulate organic carbon (POC), particulate nitrogen (PN) and AS concentrations and composition. The AS varied between 0.4 and 17.5 nmol/l. Concentrations were high in the surface waters and generally decreased with increasing depth. AS concentration decreased from the south to north. AS accounted for 0.01 to 0.71% and 0.05 to 2.37% of POC and PN, respectively. Rapid decrease in AS-C% and AS-N% with depth indicates that these compounds were preferentially degraded relative to bulk POC and PN. The composition of AS suggests that glucosamine (GLU-N) and galactosamine (GAL-N) were present in the surface SPM samples, and their abundance decreased from surface downwards. Relatively, low values of GLU-N/GAL-N ratio indicate that the organic matter was mostly derived from the detritus of micro-organisms. Our data suggest that chitin, a polymer of the glucosamine produced by many marine organisms was not the major source of AS in the Bay. Rapid cycling of these compounds indicates their importance in the cycling of nitrogen in marine waters.

show abstract

Biogeochemistry of the Bay of Bengal: physical, chemical and primary productivity characteristics of the central and western Bay of Bengal during summer monsoon 2001

Abstract: Reliable data on biological characteristics from the Bay of Bengal are elusive. In this paper, we present results on physics, chemistry and biology simultaneously measured

Cited by 273 publications

References 21 publications

Eddy-mediated biological productivity in the Bay of Bengal during fall and spring intermonsoons

Eddy-mediated biological productivity in the Bay of Bengal during fall and spring intermonsoons

Reactive Nitrogen in Coastal and Marine Waters of India and Its Relationship With Marine Aquaculture

Amino sugars in suspended particulate matter from the Bay of Bengal during the summer monsoon of 2001

Contact Info

Product

Resources

About