Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Investigation of coastal ammonium aerosol sources in the Northwest Pacific Ocean
https://orcid.org/0000-0001-6346-9840
Abstract Determining the magnitude and origins of nitrogen (N) deposition in the open ocean is vital for understanding how anthropogenic activities influence oceanic biogeochemical cycles. Excess N in the North Pacific Ocean (NPO) is suggested to reflect recent anthropogenic atmospheric deposition from the Asian continent, changes in nutrient dynamics due to marine N-fixation, and/or lateral transport of nutrients. We investigate the impact of anthropogenic and marine sources on reactive N deposition in the NPO, with a focus on ammonium (NH4 +), an important bioavailable nutrient, using aerosol samples (n = 108) collected off the coast of China (Changdao Island). This study site is used as a proxy for continental emissions that can be exported and subsequently deposited to the ocean. The NH4 + concentration of aerosol samples varied seasonally (p < 0.05), with a higher average value in winter (2.8 ± 1.1 μg/m3) and spring (1.9 ± 0.8 μg/m3) compared to autumn (0.7 ± 0.6 μg/m3) and summer (1.4 ± 0.4 μg/m3). The isotopic composition of aerosol NH4 + varied seasonally, with higher averages in spring (13.3 ± 7.9‰) and summer (15.6 ± 6.2‰) compared to autumn (3.2 ± 2.5 ‰) and winter (3.8 ± 11.4 ‰). These seasonal patterns in the isotopic composition of NH4 + are investigated based on correlations of aerosol chemical species, seasonal shifts in transport patterns, partitioning of ammonia/ammonium between the gas and particle phase, and continental versus marine sources of ammonia. We find that anthropogenic activities, mainly agricultural practices (e.g., volatilization, fertilizer, animal husbandry), are the primary sources of NH4 + deposited to the NPO.
Highlights Nitrogen deposition to the Pacific Ocean is linked to biogeochemical changes. Observations include year-round ammonium concentration and isotopes, transport analysis, and aerosol composition. Together with an isotope mixing model results suggest ammonium is mainly from agriculture/animal husbandry. Seasonally the highest ammonium concentration and aerosol loading occurs in winter. Source contributions are critical to determine if external N is shifting ocean biogeochemistry.
Investigation of coastal ammonium aerosol sources in the Northwest Pacific Ocean
https://orcid.org/0000-0001-6346-9840
Abstract Determining the magnitude and origins of nitrogen (N) deposition in the open ocean is vital for understanding how anthropogenic activities influence oceanic biogeochemical cycles. Excess N in the North Pacific Ocean (NPO) is suggested to reflect recent anthropogenic atmospheric deposition from the Asian continent, changes in nutrient dynamics due to marine N-fixation, and/or lateral transport of nutrients. We investigate the impact of anthropogenic and marine sources on reactive N deposition in the NPO, with a focus on ammonium (NH4 +), an important bioavailable nutrient, using aerosol samples (n = 108) collected off the coast of China (Changdao Island). This study site is used as a proxy for continental emissions that can be exported and subsequently deposited to the ocean. The NH4 + concentration of aerosol samples varied seasonally (p < 0.05), with a higher average value in winter (2.8 ± 1.1 μg/m3) and spring (1.9 ± 0.8 μg/m3) compared to autumn (0.7 ± 0.6 μg/m3) and summer (1.4 ± 0.4 μg/m3). The isotopic composition of aerosol NH4 + varied seasonally, with higher averages in spring (13.3 ± 7.9‰) and summer (15.6 ± 6.2‰) compared to autumn (3.2 ± 2.5 ‰) and winter (3.8 ± 11.4 ‰). These seasonal patterns in the isotopic composition of NH4 + are investigated based on correlations of aerosol chemical species, seasonal shifts in transport patterns, partitioning of ammonia/ammonium between the gas and particle phase, and continental versus marine sources of ammonia. We find that anthropogenic activities, mainly agricultural practices (e.g., volatilization, fertilizer, animal husbandry), are the primary sources of NH4 + deposited to the NPO.
Highlights Nitrogen deposition to the Pacific Ocean is linked to biogeochemical changes. Observations include year-round ammonium concentration and isotopes, transport analysis, and aerosol composition. Together with an isotope mixing model results suggest ammonium is mainly from agriculture/animal husbandry. Seasonally the highest ammonium concentration and aerosol loading occurs in winter. Source contributions are critical to determine if external N is shifting ocean biogeochemistry.
Investigation of coastal ammonium aerosol sources in the Northwest Pacific Ocean
https://orcid.org/0000-0001-6346-9840
Abstract Determining the magnitude and origins of nitrogen (N) deposition in the open ocean is vital for understanding how anthropogenic activities influence oceanic biogeochemical cycles. Excess N in the North Pacific Ocean (NPO) is suggested to reflect recent anthropogenic atmospheric deposition from the Asian continent, changes in nutrient dynamics due to marine N-fixation, and/or lateral transport of nutrients. We investigate the impact of anthropogenic and marine sources on reactive N deposition in the NPO, with a focus on ammonium (NH4 +), an important bioavailable nutrient, using aerosol samples (n = 108) collected off the coast of China (Changdao Island). This study site is used as a proxy for continental emissions that can be exported and subsequently deposited to the ocean. The NH4 + concentration of aerosol samples varied seasonally (p < 0.05), with a higher average value in winter (2.8 ± 1.1 μg/m3) and spring (1.9 ± 0.8 μg/m3) compared to autumn (0.7 ± 0.6 μg/m3) and summer (1.4 ± 0.4 μg/m3). The isotopic composition of aerosol NH4 + varied seasonally, with higher averages in spring (13.3 ± 7.9‰) and summer (15.6 ± 6.2‰) compared to autumn (3.2 ± 2.5 ‰) and winter (3.8 ± 11.4 ‰). These seasonal patterns in the isotopic composition of NH4 + are investigated based on correlations of aerosol chemical species, seasonal shifts in transport patterns, partitioning of ammonia/ammonium between the gas and particle phase, and continental versus marine sources of ammonia. We find that anthropogenic activities, mainly agricultural practices (e.g., volatilization, fertilizer, animal husbandry), are the primary sources of NH4 + deposited to the NPO.
Highlights Nitrogen deposition to the Pacific Ocean is linked to biogeochemical changes. Observations include year-round ammonium concentration and isotopes, transport analysis, and aerosol composition. Together with an isotope mixing model results suggest ammonium is mainly from agriculture/animal husbandry. Seasonally the highest ammonium concentration and aerosol loading occurs in winter. Source contributions are critical to determine if external N is shifting ocean biogeochemistry.
Investigation of coastal ammonium aerosol sources in the Northwest Pacific Ocean
MacFarland, Alexandra B. (Autor:in) / Joyce, Emily E. (Autor:in) / Wang, Xuchen (Autor:in) / Walters, Wendell W. (Autor:in) / Altieri, Katye E. (Autor:in) / Schiebel, Hayley N. (Autor:in) / Hastings, Meredith G. (Autor:in)
Atmospheric Environment ; 312
14.08.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Ammonium , Isotopes , Deposition , Ocean , Anthropogenic
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