Atmospheric deposition—Another source of nutrients enhancing primary productivity in the eastern tropical Indian Ocean during positive Indian Ocean Dipole phases

Siswanto, Eko

doi:10.1002/2015gl064188

Cited by 9 publications

(8 citation statements)

References 21 publications

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“…In contrast, SST, tropical cyclones, and rainfall can explain more about the variance in annual BSi in the nIOD phase (Table 2). The result is consistent with the model evaluations in the eastern Indian Ocean between 1997 and 2009, which showed that the atmospheric deposition of nutrients from wildfire accounted for a higher proportion of MPP increase than that of wind-driven nutrient upwelling in pIOD phases 33 .…”

Section: Discussionsupporting

confidence: 90%

Wildfires enhance phytoplankton production in tropical oceans

et al. 2022

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Wildfire magnitude and frequency have greatly escalated on a global scale. Wildfire products rich in biogenic elements can enter the ocean through atmospheric and river inputs, but their contribution to marine phytoplankton production is poorly understood. Here, using geochemical paleo-reconstructions, a century-long relationship between wildfire magnitude and marine phytoplankton production is established in a fire-prone region of Kimberley coast, Australia. A positive correlation is identified between wildfire and phytoplankton production on a decadal scale. The importance of wildfire on marine phytoplankton production is statistically higher than that of tropical cyclones and rainfall, when strong El Niño Southern Oscillation coincides with the positive phase of Indian Ocean Dipole. Interdecadal chlorophyll-a variation along the Kimberley coast validates the spatial connection of this phenomenon. Findings from this study suggest that the role of additional nutrients from wildfires has to be considered when projecting impacts of global warming on marine phytoplankton production.

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Section: Discussionsupporting

confidence: 90%

Wildfires enhance phytoplankton production in tropical oceans

et al. 2022

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“…The patchiness of the plankton and their seasonal and interannual variations can cause large overall errors as well. A recent study by Siswanto [] showed that atmospheric deposition of nutrients from wildfires accounted for a higher portion of enhanced primary production during positive phases of the Indian Ocean Dipole than did wind‐driven nutrient upwelling in the eastern tropical Indian Ocean. We suggest that the contribution of atmospheric deposition to new production in the Oman upwelling regions, where mineral dust aerosols are significantly high, is larger than 3% by an order of magnitude.…”

Section: Discussionmentioning

confidence: 99%

Potential new production in two upwelling regions of the western Arabian Sea: Estimation and comparison

Liao

Zhan

2016

JGR Oceans

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Using satellite‐derived and in situ data, the wind‐driven potential new production (nitrate supply) for the 300 km wide coastal band in two upwelling regions of the western Arabian Sea (AS) during the southwest monsoon is estimated. The upward nitrate flux to the euphotic zone is generally based on the physical processes of coastal transport (Ekman transport and geostrophic transport) and offshore Ekman pumping. The coastal geostrophic current in the western AS influences the upwelling intensity and latitudinal distributions of nitrate supply. The Oman and Somalia upwelling regions have similar level of potential new production (nitrate supply) during the summer monsoon, while the satellite estimates of primary production off Oman are 2 times greater than those off Somalia. The much higher potential f‐ratio in the Somalia upwelling region indicates that the primary production could be limited by availability of other macronutrients (e.g., silicate). The correlation analysis of the primary production and the aerosol optical thickness shows that the Oman upwelling region displays a stronger coupling between the atmospheric deposition and the phytoplankton abundance. The high summertime dust levels in the atmosphere are suggested to contribute to the high primary production in the Oman upwelling region.

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“…The tropical Indian Ocean forms the major part of the largest warm pool on the earth, and its interaction with the monsoon plays an important role in shaping complex circulation systems on both regional and global scales (Wang, Xie, & Carton, ). Furthermore, the variability of nutrients, biomass, and primary production in the Indian Ocean induced by changes in physical forces have been investigated by a number of studies (McClanahan, Maina, Graham, & Jones, ; Roxy et al., ; Siswanto, ), which usually showed that the variability in phytoplankton standing stocks and primary production are closely related to the circulations and water masses. Although the Indian Ocean is considered as one of the largest oligotrophic areas, it has received far less attention than other oceans, particularly in terms of the size and biomass of picophytoplankton.…”

Section: Introductionmentioning

confidence: 99%

Picophytoplankton size and biomass around equatorial eastern Indian Ocean

et al. 2018

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The cellular size and biomass of picophytoplankton were studied by flow cytometer during spring monsoon (March-May of 2015) in equatorial eastern Indian Ocean. We established an empirical relationship between forward scatter and cellular size to address the size and biomass of picophytoplankton. Results indicated that mean cell diameter of Prochlorococcus (0.60 μm) was the smallest, and then followed by Synechococcus (0.98 μm) and picoeukaryotic phytoplankton (1.05 μm). Thereafter, the biomass converted by abundance reached 0.64 μg·C·L for Prochlorococcus, 0.34 μg·C·L for Synechococcus, and 0.20 μg·C·L for picoeukaryotic phytoplankton. Additionally, the distinct biomass contribution of picophytoplankton appeared to be affected by abundance, but not changes in cellular size. Vertically, the cellular sizes of picophytoplankton were remarkably small in upper waters, which was predominantly controlled by the nutrient availability. In contrast, they were larger in deeper waters, which was primarily attributed to the combined effects of low temperature and reduced light availability. Spatially, under the influence of high nutrient concentration induced by the different circulations and coastal upwelling, slightly high carbon biomass of picophytoplankton was observed around the coastal zones of Sri Lanka island and Sumatra, as well as the southern Bay of Bengal.

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Atmospheric deposition—Another source of nutrients enhancing primary productivity in the eastern tropical Indian Ocean during positive Indian Ocean Dipole phases

Cited by 9 publications

References 21 publications

Wildfires enhance phytoplankton production in tropical oceans

Wildfires enhance phytoplankton production in tropical oceans

Potential new production in two upwelling regions of the western Arabian Sea: Estimation and comparison

Picophytoplankton size and biomass around equatorial eastern Indian Ocean

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