Assessment of an ocean-ecosystem model in simulating the Indian coastal marine ecosystem dynamics

Chakraborty, Kunal; Lotliker, Aneesh A.; Gupta, G.V.M.; Nampoothiri, S Vishnu Narayanan; Paul, Arya; Ghosh, Jayashree; Bhattacharya, Trishneeta; Baliarsingh, Sanjiba Kumar; Samanta, Alakes

doi:10.1080/1755876x.2020.1843298

Cited by 1 publication

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“…Despite being located in similar geographical locations, AS and BoB exhibit different physical and biological characteristics (Prasanna Kumar et al, 2002;Shenoi et al, 2002;Chakraborty et al, 2020). It is primarily due to the southwest monsoon winds where the AS encounters strong upwelling when rapid surface cooling occurs because of entrainment pushed by the strong winds (Findlater, 1969).…”

Section: Introductionmentioning

confidence: 99%

Long-Term Trends and Impact of SARS-CoV-2 COVID-19 Lockdown on the Primary Productivity of the North Indian Ocean

et al. 2021

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COrona VIrus Disease (COVID) 2019 pandemic forced most countries to go into complete lockdown and India went on complete lockdown from 24th March 2020 to 8th June 2020. To understand the possible implications of lockdown, we analyze the long-term distribution of Net Primary Productivity (NPP) in the North Indian Ocean (NIO) and the factors that influence NPP directly and indirectly, for the period 2003–2019 and 2020 separately. There exists a seasonal cycle in the relationship between Aerosol Optical Depth (AOD), Chlorophyll-a (Chl-a) and NPP in agreement with the seasonal transport of aerosols and dust into these oceanic regions. In Arabian Sea (AS), the highest Chl-a (0.58 mg/m3), NPP (696.57 mg/C/m2/day) and AOD (0.39) are observed in June, July, August, and September (JJAS). Similarly, maximum Chl-a (0.48 mg/m3) and NPP (486.39 mg/C/m2/day) are found in JJAS and AOD (0.27) in March, April, and May (MAM) in Bay of Bengal. The interannual variability of Chl-a and NPP with wind speed and Sea Surface Temperature (SST) is also examined, where the former has a positive and the latter has a negative feedback to NPP. The interannual variability of NPP reveals a decreasing trend in NPP, which is interlinked with the increasing trend in SST and AOD. The analysis of wind, SST, Chl-a, and AOD for the pre-lockdown, lockdown, and post lockdown periods of 2020 is employed to understand the impact of COVID-19 lockdown on NPP. The assessment shows the reduction in AOD, decreased wind speeds, increased SST and reduced NPP during the lockdown period as compared to the pre-lockdown, post-lockdown and climatology. This analysis is expected to help to understand the impact of aerosols on the ocean biogeochemistry, nutrient cycles in the ocean biogeochemical models, and to study the effects of climate change on ocean ecosystems.

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