Spatio-temporal variability of chlorophyll in the northern Indian Ocean: A biogeochemical argo data perspective

Jayaram, Chiranjivi; Bhaskar, T. V. S. Udaya; Chacko, Neethu; Prakash, Satya; Rao, K. H.

doi:10.1016/j.dsr2.2021.104928

Cited by 12 publications

(3 citation statements)

References 30 publications

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“…They also stated that the cyclonic eddies play a significant role in not only initiating high rates of chlorophyll but also by sustaining it for prolonged period depending on the lifespan of eddies. Some of the recent studies also shows the increase of sea surface chlorophyll due to the presence of cyclonic eddies (Girishkumar et al ., 2019; Jayaram et al ., 2021).…”

Section: Resultsmentioning

confidence: 99%

“…Recent studies also shown that the presence of cyclonic eddies in the AS increases the intensity of surface chlorophyll (Nukapothula et al ., 2018; Wang et al ., 2020; Shafeeque et al ., 2021; Peter et al ., 2022; Smitha et al ., 2022). The strong chlorophyll anomalies are evident in the AS when compared with the BoB is associated with the presence of strong upwelling zones, intense mixing of surface waters due to stronger winds that are weak or absent in the BoB (Ajith Joseph et al ., 2019; Jayaram et al ., 2021; Jyothibabu et al ., 2021; Lahiri and Vissa, 2022). Recently, Smitha et al .…”

Section: Resultsmentioning

confidence: 99%

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Mesoscale eddies with anomalous sea surface temperature and its relation with atmospheric convection over the North Indian Ocean

Gulakaram

Anandh

Bhaskaran

2023

Intl Journal of Climatology

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Mesoscale eddies are the important phenomenon of world oceans that play a prominent role in influencing the near-surface atmosphere and transport of heat. Ocean and atmosphere responses due to the presence of oceanic mesoscale eddies are not well studied in the Northern Indian Ocean (NIO) region.The present study analysed the ocean and atmospheric response due to the presence of mesoscale eddies using a composite analysis. Generally, it is assumed that the anti-cyclonic eddies are associated with the positive anomalies of sea surface temperature (SST), and cyclonic eddies are accompanied by negative anomalies. However, for the two marginal seas in the NIO, that is, the Bay of Bengal (BoB) and Arabian Sea (AS), the composite picture of SST anomalies associated with mesoscale eddies showed an abnormal response of SST. This unusual behaviour of cold SST near anti-cyclonic eddies and warm SST near cyclonic eddies in BoB and AS is analysed with the mean composites of precipitation, outgoing longwave radiation (OLR), and turbulent fluxes. The mean composites over all anti-cyclonic eddies reveal the presence of enhanced precipitation and convection (low OLR), whereas over cyclonic eddies, suppressed convection and negative precipitation anomalies are evident. The composites of latent heat flux (LHF), precipitation and OLR near surface cold anticyclonic eddies indicate the loss of heat from the ocean to the atmosphere, intense precipitation along with cloudy conditions are responsible for the cooling of the ocean. Along with this, stronger winds are also evident during cloudy conditions could play a role in anomalous cooling of SST observed near anti-cyclonic through intense surface mixing. Similarly, vice versa is observed near the surface warm cyclonic eddies. The overlying atmosphere and abnormal response of SST near oceanic eddies are essential for understanding the significant role of oceanic mesoscale eddies in influencing the large-scale circulation of the atmosphere and climate.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Mesoscale eddies with anomalous sea surface temperature and its relation with atmospheric convection over the North Indian Ocean

Gulakaram

Anandh

Bhaskaran

2023

Intl Journal of Climatology

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“…Compared to the tropical Pacific and Atlantic Ocean, the air-sea CO 2 differences in the tropical IO have further emphasized its role in carbon export and climatic regulation in the earth system (Landschützer et al, 2016). The distributions of nutrient supply, iron limitation, elemental stoichiometry in OM, primary production, and community compositions were found to vary meridionally in the eastern tropical IO (Baer et al, 2019;Garcia et al, 2018;Wei et al, 2019;Dalabehara and Sarma, 2021;Jayaram et al, 2021;Liu H. et al, 2021;. For instance, compared to the central or south Indian Ocean, the Bay of Bengal (BoB) was overall characterized as high total nitrogen, alleviated iron stress and high rates of new production (Kumar et al, 2004;Grand et al, 2015;Baer et al, 2019).…”

Section: Introductionmentioning

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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Distribution of water masses in the tropical-subtropical convergence off Mexico, using an autonomous profiler (2017–2021).

Sánchez-Pérez

Ruvalcaba-Aroche

Sánchez‐Velásco

et al. 2023

Continental Shelf Research

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Spatio-temporal variability of chlorophyll in the northern Indian Ocean: A biogeochemical argo data perspective

Cited by 12 publications

References 30 publications

Mesoscale eddies with anomalous sea surface temperature and its relation with atmospheric convection over the North Indian Ocean

Mesoscale eddies with anomalous sea surface temperature and its relation with atmospheric convection over the North Indian Ocean

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

Distribution of water masses in the tropical-subtropical convergence off Mexico, using an autonomous profiler (2017–2021).

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