Dataset Information

Seasonal Evolution of Size-Segregated Particulate Mercury in the Atmospheric Aerosol Over Terra Nova Bay, Antarctica.

ABSTRACT: Size-fractionated particulate mercury (PHg) measurements were performed from November 2017 to January 2018 at Terra Nova Bay (Antarctica) for the first time. Samples were collected every 10 days by a six-stage high-volume cascade impactor with size classes between 10 ?m and 0.49 ?m. Total PHg concentrations were maxima (87 ± 8 pg m-3) in November, then decreased to values ~40% lower and remained almost constant until the end of the sampling period (~30 pg m-3). The trimodal aerosol mass distribution reveals that from 30% to 90% of the total PHg came in the size > 1.0 ?m. Hg in the two coarse fractions was probably produced by the adsorption of oxidized Hg species transported by air masses from the Antarctic plateau or produced locally by sea ice edges. PHg in accumulation mode seemed to be related to gas-particle partitioning with sea salt aerosol. Finally, average dry deposition fluxes of PHg were calculated to be 0.36 ± 0.21 ng m-2 d-1 in the accumulation mode, 47 ± 44 ng m-2 d-1 in the first coarse mode, and 37 ± 31 ng m-2 d-1 in the second coarse mode. The present work contributed to the comprehension of the Hg biogeochemical cycle, but further research studies are needed.

SUBMITTER: Illuminati S

PROVIDER: S-EPMC7504777 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature

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Publications

Seasonal Evolution of Size-Segregated Particulate Mercury in the Atmospheric Aerosol Over Terra Nova Bay, Antarctica.

Illuminati Silvia S Annibaldi Anna A Bau Sébastien S Scarchilli Claudio C Ciardini Virginia V Grigioni Paolo P Girolametti Federico F Vagnoni Flavio F Scarponi Giuseppe G Truzzi Cristina C

Molecules (Basel, Switzerland) 20200831 17

Size-fractionated particulate mercury (PHg) measurements were performed from November 2017 to January 2018 at Terra Nova Bay (Antarctica) for the first time. Samples were collected every 10 days by a six-stage high-volume cascade impactor with size classes between 10 μm and 0.49 μm. Total PHg concentrations were maxima (87 ± 8 pg m<sup>-3</sup>) in November, then decreased to values ~40% lower and remained almost constant until the end of the sampling period (~30 pg m<sup>-3</sup>). The trimodal ...[more]

PMID: 32878154

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Project description:Organic carbon fixed by photosynthesis of phytoplankton during the polar growing period could be important for their survival and consumers during the long polar night. Differences in biochemical traits of phytoplankton between ice-free and polar night periods were investigated in biweekly water samples obtained at the Korean "Jang Bogo Station" located in Terra Nova Bay, Antarctica. The average concentration of total Chl-a from phytoplankton dominated by micro-sized species from the entire sampling period was 0.32 μg L-1 (SD = ± 0.88 μg L-1), with the highest concentration of 4.29 μg L-1 in February and the lowest concentration of 0.01 μg L-1 during the ice-covered polar night (April-October) in 2015. The highest protein concentration coincided with the peak Chl-a concentration in February and decreased rapidly relative to the carbohydrate and lipid concentrations in the early part of polar night. Among the different biochemical components, carbohydrates were the predominant constituent, accounting for 69% (SD = ± 14%) of the total particulate organic matter (POM) during the entire study period. The carbohydrate contributions to the total POM markedly increased from 39 ± 8% during the ice-free period to 73 ± 9% during the polar night period. In comparison, while we found a significant negative correlation (r 2 = 0.92, p < 0.01) between protein contributions and carbohydrate contributions, lipid contributions did not show any particular trend with relatively small temporal variations during the entire observation period. The substantial decrease in the average weight ratio of proteins to carbohydrates from the ice-free period (mean ± SD = 1.0 ± 0.3) to the ice-covered period (mean ± SD = 0.1 ± 0.1) indicates a preferential loss of nitrogen-based proteins compared to carbohydrates during the polar night period. Overall, the average food material (FM) concentration and calorific contents of FM in this study were within the range reported previously from the Southern Ocean. The results from this study may serve as important background data for long-term monitoring of the regional and interannual variations in the physiological state and biochemical compositions of phytoplankton resulting from future climate change in Antarctica.

Dataset Information

Seasonal Evolution of Size-Segregated Particulate Mercury in the Atmospheric Aerosol Over Terra Nova Bay, Antarctica.

Publications

Seasonal Evolution of Size-Segregated Particulate Mercury in the Atmospheric Aerosol Over Terra Nova Bay, Antarctica.

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