Variability of particulate organic carbon and assessment of satellite retrieval algorithms over the eastern Arabian Sea

Shaju, S.S.; Sunny, Ginchu Mariam; Sherin, C. K.; Vishnu, N. N. S.; Reddy, Bikram; Sudheesh, V.; Prachi, M.; Kumar, Sanjeev; Vijayan, Anil Kumar; Gupta, G.V.M.

doi:10.1007/s10661-022-10264-9

Cited by 2 publications

(1 citation statement)

References 79 publications

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“…Stimulated production was a possible consequence of the shoaling of the mixed layer, as it was concurrent with a rise in the depthaveraged light intensity, known as "detrainment events" (McCreary et al, 1996). These events were considered highly productive and were found to develop throughout the Arabian Sea in spring (McCreary et al, 1996;Sunny et al, 2022). The satellite-derived Chl a distribution further confirmed the enhanced production in the w-CIO during the sampling period, with surface Chl a concentrations significantly increased in April (t-test, p< 0.01) (Figure S8).…”

Section: Euphotic Om Distributions In Two Different Stratified Systemsmentioning

confidence: 99%

Different behaviors of organic matter under physical-biological controls in the eastern Indian Ocean

Zhang

et al. 2023

Front. Mar. Sci.

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Marine organic matter (OM) pools are the key to understanding biogeochemical cycles and carbon storage, especially under ongoing ocean warming. The tropical eastern Indian Ocean (IO) is ideal for unraveling marine OM pools for being one of the least understood ocean basins in terms of its complex physical and biogeochemical dynamics. So far, OM transformation and export remain underexplored and enigmatic in the IO. Here, we integrated in situ observations and incubation experiments in the Central IO (CIO) and Bay of Bengal (BoB). A large OM pool was found in the CIO, where we emphasized the prominent contribution of production in the deep euphotic layer, with physical forcing seasonally playing a supporting role. The dissolved organic matter (DOM)-degradation experiment results revealed high efficiency of in situ DOM consumption in the BoB, whereas dark carbon fixation by ammonia-oxidizing microorganisms was considered an alternative strategy in the euphotic CIO. Water mixing was found to highly influence the OM pools in the mesopelagic waters in the tropical eastern IO, but active microbial respiration could also regulate the OM degradation in the CIO. Our results emphasized the heterogeneity of OM pools between the BoB and CIO, and stated their different regulators of carbon reservoir considering an ocean warming scenario.

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Section: Euphotic Om Distributions In Two Different Stratified Systemsmentioning

confidence: 99%

Different behaviors of organic matter under physical-biological controls in the eastern Indian Ocean

Zhang

et al. 2023

Front. Mar. Sci.

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Dynamics of Prokaryotes in the Arabian Sea: Insights into the Interplay of Physicochemical and Biological Variables from Epi to Bathypelagic zone

Hafza,

et al. 2023

Preprint

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Bacteria play a crucial role in the Arabian Sea ecosystem by actively participating in the decomposition of organic matter, facilitating nutrient remineralisation and thereby enhancing overall productivity. This study aims to resolve the spatial and seasonal variations in prokaryotic abundance (PA) and biomass with respect to the physicochemical parameters during Spring Inter Monsoon (SIM, April-May), Summer monsoon (SM, June-September), and Winter Monsoon (WM, October-February) in the eastern Arabian Sea. Prokaryotic abundance and biomass distribution estimated using microscopic techniques revealed their highest abundance during SIM, ranging from 2.29 to 4.41 × 106 Cells mL-1 and 8.39 to 21.82 µgL-1, respectively. Similarly, high PA and biomass were observed in late SM (September), ranging from 2.01 to 3.96 × 106 Cells mL-1 and 8.74 to 16.70 µgL-1, respectively, which was preceded by a higher abundance of phytoplankton (Chlorophyll a- 14.57 mg m-3) during peak SM (August). Spatially, the mid-photic waters (M, 75–100 m) sustained high PA during winter convective mixing (January-February). DistLM analysis revealed that ammonia, dissolved oxygen and temperature were the most important factors influencing the PA in the upper photic zone. In contrast, nutrients such as silicate, nitrate, nitrite, and phosphate were the major determining factors in the deeper disphotic waters (200–2000 m) which sustained a stable PA throughout the study period. This study throws light on the intricate interplay between physicochemical and biological variables in shaping prokaryotic population during various physical forcings such as upwelling and convective mixing through intense sampling efforts in the Arabian Sea.

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Variability of particulate organic carbon and assessment of satellite retrieval algorithms over the eastern Arabian Sea

Cited by 2 publications

References 79 publications

Different behaviors of organic matter under physical-biological controls in the eastern Indian Ocean

Different behaviors of organic matter under physical-biological controls in the eastern Indian Ocean

Dynamics of Prokaryotes in the Arabian Sea: Insights into the Interplay of Physicochemical and Biological Variables from Epi to Bathypelagic zone

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