Abstract:Atmospheric iron (Fe) from anthropogenic, lithogenic,
and pyrogenic
sources contributes to ocean fertilization, climate change, and human
health risk. However, significant uncertainties remain in the source
apportionment due to a lack of source-specific evaluation of Fe-laden
aerosols. Here, the large uncertainties in the model estimates are
investigated using different Fe emissions from metal production. The
best agreement in the anthropogenic factor of aerosol Fe concentrations
with the field data in the dow… Show more
“…However, an international project combining multiple atmospheric Fe models and field observational data draws one conclusion from several proposed hypotheses to explain this inverse relationship (Figure 6). 127 The statistical analyses of the comprehensive data reveal a dominant role of combustion (anthropogenic and pyrogenic) Fe 32 Please do not adjust margins Please do not adjust margins in high Fe bioaccessibility at low concentration in real environments. 127 In addition to the shipboard measurements, a ground-based field study concludes that when estimated aerosol pH is lower than 2, the proton-promoted dissolution of Fe leads to a strong relationship between bioaccessible Fe and pH.…”
Section: Bioaccessible Ironmentioning
confidence: 99%
“…Here, we use the Integrated Massively Parallel Atmospheric Chemical Transport (IMPACT) model to estimate the source profile of marine aerosols over the Pacific. 32 In the model, 20 the POA emissions from the sea surface are calculated as a function of the chlorophyll a concentration, wind speed, sea surface temperature, and aerosol diameter. 33 The spatial distribution shows that POAs from sea spray comprise the majority of OAs over the tropical and subarctic North Pacific while POAs from continental sources contribute to the dominant sources over the regions of continental outflow.…”
Section: Aerosols and Their Precursor Gases Emitted From Oceans And T...mentioning
confidence: 99%
“…In the following, we use the IMPACT model to estimate the source contribution to the atmospheric deposition of reactive N (Section 3.1) and bioaccessible Fe (Section 3.2). 32…”
Section: Nutrients Supplied From the Atmosphere And Their Impacts On ...mentioning
confidence: 99%
“…Fig. 6 Relationship between aerosol Fe concentration (ng m -3 ) and Fe bioaccessibility (%) for the field data (black circles) and (b) IMPACT model (red squares) over (a) the North Pacific (< 66 °N) and (b) the South Pacific (> 60 °S) regions (98° < latitude < 293.75°) 32. …”
mentioning
confidence: 99%
“…Fig. 7 Contribution of atmospheric deposition of bioaccessible Fe from (a) anthropogenic (13 Gg per year Fe), (b) pyrogenic (4 Gg per year Fe), and (c) lithogenic (48 Gg per year Fe) aerosols into the Pacific in 2019 32. The values in parentheses represent the annual deposition fluxes.…”
Human activities have profoundly altered the air quality and climate on a global scale in the Anthropocene. It is our task to quantitatively evaluate the impact of human activities on...
“…However, an international project combining multiple atmospheric Fe models and field observational data draws one conclusion from several proposed hypotheses to explain this inverse relationship (Figure 6). 127 The statistical analyses of the comprehensive data reveal a dominant role of combustion (anthropogenic and pyrogenic) Fe 32 Please do not adjust margins Please do not adjust margins in high Fe bioaccessibility at low concentration in real environments. 127 In addition to the shipboard measurements, a ground-based field study concludes that when estimated aerosol pH is lower than 2, the proton-promoted dissolution of Fe leads to a strong relationship between bioaccessible Fe and pH.…”
Section: Bioaccessible Ironmentioning
confidence: 99%
“…Here, we use the Integrated Massively Parallel Atmospheric Chemical Transport (IMPACT) model to estimate the source profile of marine aerosols over the Pacific. 32 In the model, 20 the POA emissions from the sea surface are calculated as a function of the chlorophyll a concentration, wind speed, sea surface temperature, and aerosol diameter. 33 The spatial distribution shows that POAs from sea spray comprise the majority of OAs over the tropical and subarctic North Pacific while POAs from continental sources contribute to the dominant sources over the regions of continental outflow.…”
Section: Aerosols and Their Precursor Gases Emitted From Oceans And T...mentioning
confidence: 99%
“…In the following, we use the IMPACT model to estimate the source contribution to the atmospheric deposition of reactive N (Section 3.1) and bioaccessible Fe (Section 3.2). 32…”
Section: Nutrients Supplied From the Atmosphere And Their Impacts On ...mentioning
confidence: 99%
“…Fig. 6 Relationship between aerosol Fe concentration (ng m -3 ) and Fe bioaccessibility (%) for the field data (black circles) and (b) IMPACT model (red squares) over (a) the North Pacific (< 66 °N) and (b) the South Pacific (> 60 °S) regions (98° < latitude < 293.75°) 32. …”
mentioning
confidence: 99%
“…Fig. 7 Contribution of atmospheric deposition of bioaccessible Fe from (a) anthropogenic (13 Gg per year Fe), (b) pyrogenic (4 Gg per year Fe), and (c) lithogenic (48 Gg per year Fe) aerosols into the Pacific in 2019 32. The values in parentheses represent the annual deposition fluxes.…”
Human activities have profoundly altered the air quality and climate on a global scale in the Anthropocene. It is our task to quantitatively evaluate the impact of human activities on...
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