Impact of Atmospheric Deposition on Carbon Export to the Deep Ocean in the Subtropical Northwest Pacific

Xiu, Peng; Chai, Fei

doi:10.1029/2020gl089640

Cited by 22 publications

(20 citation statements)

References 82 publications

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“…Atmospheric N deposition can support >10% of the annual export production in nearshore regions along the Japanese coast and the SCS [ 49 , 82 ]. Using sediment trap measurement and a biogeochemical model, it has been shown that the seasonal variability of deep-ocean POC export is largely driven by the atmospheric Fe and N deposition that cause seasonal change of phytoplankton community composition and micro- and meso-zooplankton grazing pressure [ 83 ]. In addition to direct stimulation by atmospheric nutrients, strong winds accompanying the dust storms can also induce vertical mixing of the water column and the supply of nutrients into the mixed layer from the subsurface [ 49 , 84 ], the effect of which may occasionally overwhelm the effect of atmospheric input of aerosol nutrients [ 73 ].…”

Section: Effect Of East Asian Aerosol On Phytoplankton In Nwpo and It...mentioning

confidence: 99%

Aerosol Nutrients and Their Biological Influence on the Northwest Pacific Ocean (NWPO) and Its Marginal Seas

Guo

Zhou

et al. 2022

Biology

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Atmospheric deposition is recognized as a significant source of nutrients in the surface ocean. The East Asia region is among the largest sources of aerosol emissions in the world, due to its large industrial, agricultural, and energy production. Thus, East Asian aerosols contain a large proportion of anthropogenic particles that are characterized by small size, complex composition, and high nutrient dissolution, resulting in important influences on marine microbes and biogeochemical cycles in the downwind areas of the northwest Pacific Ocean (NWPO). By using remote sensing, modeling, and incubation experimental methods, enhanced primary production due to the East Asian aerosol input has been observed in the NWPO, with subsequent promotion and inhibition impacts on different phytoplankton taxa. Changes of bacterial activity and diversity also occur in response to aerosol input. The impact of East Asian aerosol loadings is closely related to the amount and composition of the aerosol deposition as well as the hydrological condition of the receiving seawater. Here, we review the current state of knowledge on the atmospheric nutrients and the effects of the East Asian aerosols on microbes in the NWPO region. Future research perspectives are also proposed.

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Section: Effect Of East Asian Aerosol On Phytoplankton In Nwpo and It...mentioning

confidence: 99%

Aerosol Nutrients and Their Biological Influence on the Northwest Pacific Ocean (NWPO) and Its Marginal Seas

Guo

Zhou

et al. 2022

Biology

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“…Two one-dimensional physical-biogeochemical (Ma et al, 2019) coupled models incorporating the Fe cycle (Xiu and Chai, 2021) were applied to the locations of Stn. K2 in the western subarctic Pacific and Stn.…”

Section: One-dimensional Coupled Modelmentioning

confidence: 99%

“…The biogeochemical model used in this study was based on a newly developed carbon silicate nitrate ecosystem-Fe (CoSiNE-Fe) model (Xiu and Chai, 2021 The Fe in particles can be transformed into colloidal Fe and soluble Fe through redissolution and photoreduction, respectively. Specifically, colloidal Fe is formed from soluble Fe and is removed from the dissolved pool through colloidal aggregation.…”

Section: One-dimensional Coupled Modelmentioning

confidence: 99%

Roles of Iron Limitation in Phytoplankton Dynamics in the Western and Eastern Subarctic Pacific

et al. 2021

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The subarctic Pacific is one of the major high-nitrate, low-chlorophyll (HNLC) regions where marine productivity is greatly limited by the supply of iron (Fe) in the region. There is a distinct seasonal difference in the chlorophyll concentrations of the east and west sides of the subarctic Pacific because of the differences in their driving mechanisms. In the western subarctic Pacific, two chlorophyll concentration peaks occur: the peak in spring and early summer is dominated by diatoms, while the peak in late summer and autumn is dominated by small phytoplankton. In the eastern subarctic Pacific, a single chlorophyll concentration peak occurs in late summer, while small phytoplankton dominate throughout the year. In this study, two one-dimensional (1D) physical–biological models with Fe cycles were applied to Ocean Station K2 (Stn. K2) in the western subarctic Pacific and Ocean Station Papa (Stn. Papa) in the eastern subarctic Pacific. These models were used to study the role of Fe limitation in regulating the seasonal differences in phytoplankton populations by reproducing the seasonal variability in ocean properties in each region. The results were reasonably comparable with observational data, i.e., cruise and Biogeochemical-Argo data, showing that the difference in bioavailable Fe (BFe) between Stn. K2 and Stn. Papa played a dominant role in controlling the respective seasonal variabilities of diatom and small phytoplankton growth. At Stn. Papa, there was less BFe, and the Fe limitation of diatom growth was two times as strong as that at Stn. K2; however, the difference in the Fe limitation of small phytoplankton growth between these two regions was relatively small. At Stn. K2, the decrease in BFe during summer reduced the growth rate of diatoms, which led to a rapid reduction in diatom biomass. Simultaneously, the decrease in BFe had little impact on small phytoplankton growth, which helped maintain the relatively high small phytoplankton biomass until autumn. The experiments that stimulated a further increase in atmospheric Fe deposition also showed that the responses of phytoplankton primary production in the eastern subarctic Pacific were stronger than those in the western subarctic Pacific but contributed little to primary production, as the Fe limitation of phytoplankton growth was replaced by macronutrient limitation.

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“…Dust deposition after longdistance transportation is also one of the sources of marine pollutants and nutrients, influencing marine ecosystems (Cabrerizo et al, 2016;Wang et al, 2019b). And the increased flux of iron, nitrogen and phosphorus to ocean by atmospheric dust can promote the primary production and further the particulate organic carbon export to deep ocean, which is an important way for carbon sequestration of ocean (Struve et al, 2020;Xiu and Chai, 2021). Moreover, large amounts of dust significantly influence air quality and play an essential role in disease transmission (Li et al, 2020;Tian et al, 2020;Wallden et al, 2020;Linares et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

The Temporal-Spatial Variations and Potential Causes of Dust Events in Xinjiang Basin During 1960–2015

Jing

et al. 2021

Front. Environ. Sci.

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Dust events not only cause local ecosystem degradation and desertification, but also have profound impacts on regional and global climate system, as well as air quality and human health. Dust events in Xinjiang Basin, as the important dust source of Eastern Asia, have undergone a significant change under the global warming background and may be in a new active period after 2000, which is worthy of study. This study provides the temporal and spatial variations of dust events in the Xinjiang Basin based on surface meteorological station observation data during 1960–2015. The results show that Southern Xinjiang is the main dust occurrence region where dust events are significantly more than that in the Northern Xinjiang, and each year more than 73% of dust events occurred in spring and summer. The dust index (DI), which is defined to represent the large-scale variation of dust event, shows a significant downward trend during the past 56 years with a linear decreasing rate −8.2 years−1 in Southern Xinjiang. The DI is positively correlated to surface wind speed with a mean correlation coefficient of 0.79. The declining trend of surface wind speed could explain dust events variation during 1960–2000. But in the new active period after 2000, the increase of DI is not consistent with the rising wind speed with the correlation coefficient decreasing to 0.34. It is found that, compared with 1960–1999, the average annual precipitation and frequency increased by 17.4 and 13% during 2000–2015, respectively, and the NDVI also increased at the same time, which indicates that the surface condition changes induced by the increase of precipitation might suppress the occurrence of dust. Moreover, the analysis of high-altitude wind field shows that the variation of the East Asian general circulation’s intensity, dominating the upper-level wind fields in the Xinjiang basin, will change the surface wind speed and precipitation, and further affect the occurrence of dust events.

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Impact of Atmospheric Deposition on Carbon Export to the Deep Ocean in the Subtropical Northwest Pacific

Cited by 22 publications

References 82 publications

Aerosol Nutrients and Their Biological Influence on the Northwest Pacific Ocean (NWPO) and Its Marginal Seas

Aerosol Nutrients and Their Biological Influence on the Northwest Pacific Ocean (NWPO) and Its Marginal Seas

Roles of Iron Limitation in Phytoplankton Dynamics in the Western and Eastern Subarctic Pacific

The Temporal-Spatial Variations and Potential Causes of Dust Events in Xinjiang Basin During 1960–2015

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