Surface chlorophyll anomalies associated with Indian Ocean Dipole and El Niño Southern Oscillation in North Indian Ocean: a case study of 2006–2007 event

Pandey, Suchita; Bhagawati, Chirantan; Dandapat, Sumit; Chakraborty, Arun

doi:10.1007/s10661-019-7754-z

Cited by 7 publications

(4 citation statements)

References 40 publications

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“…The annual rates of primary production in the overlying waters of the Kermadec Trench, which was the first trench in the Pacific Ocean to receive Lower Circumpolar Deep Water [66], have been estimated as 87 g C m −2 yr −1 . In contrast, a higher surface chlorophyll in the euphotic layer of the Diamantina Trench of the Indian Ocean [67,68] might affect the sinking carbon sources and microbial community composition as well [69]. Significant differences in microbial metabolic activity (AWCD) existed between the WC and BBL in the Kermadec Trench, consistent with the NMDS plot.…”

Section: Microbial Interaction and Ecological Significancesupporting

confidence: 61%

The Vertical Metabolic Activity and Community Structure of Prokaryotes along Different Water Depths in the Kermadec and Diamantina Trenches

Liu,

Jing

2024

Microorganisms

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Prokaryotes play a key role in particulate organic matter’s decomposition and remineralization processes in the vertical scale of seawater, and prokaryotes contribute to more than 70% of the estimated remineralization. However, little is known about the microbial community and metabolic activity of the vertical distribution in the trenches. The composition and distribution of prokaryotes in the water columns and benthic boundary layers of the Kermadec Trench and the Diamantina Trench were investigated using high-throughput sequencing and quantitative PCR, together with the Biolog EcoplateTM microplates culture to analyze the microbial metabolic activity. Microbial communities in both trenches were dominated by Nitrososphaera and Halobacteria in archaea, and by Alphaproteobacteria and Gammaproteobacteria in bacteria, and the microbial community structure was significantly different between the water column and the benthic boundary layer. At the surface water, amino acids and polymers were used preferentially; at the benthic boundary layers, amino acids and amines were used preferentially. Cooperative relationships among different microbial groups and their carbon utilization capabilities could help to make better use of various carbon sources along the water depths, reflected by the predominantly positive relationships based on the co-occurrence network analysis. In addition, the distinct microbial metabolic activity detected at 800 m, which was the lower boundary of the twilight zone, had the lowest salinity and might have had higher proportions of refractory carbon sources than the shallower water depths and benthic boundary layers. This study reflected the initial preference of the carbon source by the natural microbes in the vertical scale of different trenches and should be complemented with stable isotopic tracing experiments in future studies to enhance the understanding of the complex carbon utilization pathways along the vertical scale by prokaryotes among different trenches.

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Section: Microbial Interaction and Ecological Significancesupporting

confidence: 61%

The Vertical Metabolic Activity and Community Structure of Prokaryotes along Different Water Depths in the Kermadec and Diamantina Trenches

Liu,

Jing

2024

Microorganisms

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“…The positive phase of the Indian Ocean Dipole (pIOD) was also significantly correlated with turbidity along the inshore eastern coastline of the Gulf. The process by which this climate phenomenon is affecting this region is unclear despite several Indian Ocean basin wide studies on the effects of IOD variability, that have focussed on chlorophyll-a [78][79][80], biogeochemical responses [81] and even human infectious disease prevalence [82]. It is known from altimetry studies that pIOD reduces water levels in the eastern Indian Ocean south of Java by as much as 0.28 m [74] and lowers rainfall over inland Australia.…”

Section: East Coastmentioning

confidence: 99%

Identifying Metocean Drivers of Turbidity Using 18 Years of MODIS Satellite Data: Implications for Marine Ecosystems under Climate Change

et al. 2021

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Turbidity impacts the growth and productivity of marine benthic habitats due to light limitation. Daily/monthly synoptic and tidal influences often drive turbidity fluctuations, however, our understanding of what drives turbidity across seasonal/interannual timescales is often limited, thus impeding our ability to forecast climate change impacts to ecologically significant habitats. Here, we analysed long term (18-year) MODIS-aqua data to derive turbidity and the associated meteorological and oceanographic (metocean) processes in an arid tropical embayment (Exmouth Gulf in Western Australia) within the eastern Indian Ocean. We found turbidity was associated with El Niño Southern Oscillation (ENSO) cycles as well as Indian Ocean Dipole (IOD) events. Winds from the adjacent terrestrial region were also associated with turbidity and an upward trend in turbidity was evident in the body of the gulf over the 18 years. Our results identify hydrological processes that could be affected by global climate cycles undergoing change and reveal opportunities for managers to reduce impacts to ecologically important ecosystems.

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“…Analysis results based on daily temperature, precipitation, and sunshine hours for 50 years showed that precipitation decreased, and temperature and sunshine hours increased in both El Niño and La Niña years but remained stable in neutral years [13]. A study on surface chla anomalies associated with Indian Ocean Dipole and El Niño Southern Oscillation in North Indian Ocean showed that the strong negative chla anomalies over the Western Indian Ocean from November to April are due to the changes associated with the El Niño [14]. The research used rainfall data to analyze the characteristics of extreme storm events and their relationships with the ENSO phenomenon in Korea.…”

Section: Introductionmentioning

confidence: 99%

Monthly anomalies of sea surface chlorophyll-a concentration in the Khanh Hoa waters of Vietnam related to ENSO phenomenon

2021

VJMST

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Based on the monthly averaged sea surface chlorophyll-a concentration data continuously for more than 17 years (Jul. 2002–Dec. 2019), the analyzed results show that the averaged chlorophyll-a concentration in Khanh Hoa waters was 0.58 mg/m3, and the monthly average variation was ± 0.14 mg/m3 (that is equivalent to about ± 24%). Under the impact of ENSO phenomena, in the years when the double La Niña events occurred (two consecutive years in the La Nina event occurs), the chlorophyll-a anomaly index fluctuated from -0.99 mg/m3 to 1.62 mg/m3. These are very strong fluctuation levels, corresponding to the decrease or increase in chlorophyll-a concentration from 86% to 279%. In the El Niño years, the fluctuations of chlorophyll-a concentration were little affected unless the two previous years in which the double La Niña event occurred. These fluctuations have significantly impact nutritional resources and water quality because chlorophyll-a concentration is one of the key indices in studying the health status of any natural marine ecosystem. In addition, chlorophyll-a concentration in Khanh Hoa waters often varies between seasons. The averaged chlorophyll-a concentration reaches its maximum value in the winter, then decreases gradually in the spring and usually reaches the minimum value in the summer, then rises gradually again in the autumn.

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Surface chlorophyll anomalies associated with Indian Ocean Dipole and El Niño Southern Oscillation in North Indian Ocean: a case study of 2006–2007 event

Cited by 7 publications

References 40 publications

The Vertical Metabolic Activity and Community Structure of Prokaryotes along Different Water Depths in the Kermadec and Diamantina Trenches

The Vertical Metabolic Activity and Community Structure of Prokaryotes along Different Water Depths in the Kermadec and Diamantina Trenches

Identifying Metocean Drivers of Turbidity Using 18 Years of MODIS Satellite Data: Implications for Marine Ecosystems under Climate Change

Monthly anomalies of sea surface chlorophyll-a concentration in the Khanh Hoa waters of Vietnam related to ENSO phenomenon

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