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Title: Natural sea-salt emissions moderate the climate forcing of anthropogenic nitrate
Authors: Chen, YingCheng, YafangMa, NanWei, ChaoRan, LiangWolke, RalfGröß, JohannesWang, QiaoqiaoDenier van der Gon, Hugo A. C.Spindler, GeraldLelieveld, JosTegen, InaSu, HangWiedensohler, Alfred
Publishers Version: https://doi.org/10.5194/acp-20-771-2020
Issue Date: 2020
Published in: Atmospheric Chemistry and Physics 20 (2020), Nr. 2
Publisher: Katlenburg-Lindau : EGU
Abstract: Natural sea-salt aerosols, when interacting with anthropogenic emissions, can enhance the formation of particulate nitrate. This enhancement has been suggested to increase the direct radiative forcing of nitrate, called the “mass-enhancement effect”. Through a size-resolved dynamic mass transfer modeling approach, we show that interactions with sea salt shift the nitrate from sub- to super-micron-sized particles (“redistribution effect”), and hence this lowers its efficiency for light extinction and reduces its lifetime. The redistribution effect overwhelms the mass-enhancement effect and significantly moderates nitrate cooling; e.g., the nitrate-associated aerosol optical depth can be reduced by 10 %–20 % over European polluted regions during a typical sea-salt event, in contrast to an increase by ∼10 % when only accounting for the mass-enhancement effect. Global model simulations indicate significant redistribution over coastal and offshore regions worldwide. Our study suggests a strong buffering by natural sea-salt aerosols that reduces the climate forcing of anthropogenic nitrate, which had been expected to dominate the aerosol cooling by the end of the century. Comprehensive considerations of this redistribution effect foster better understandings of climate change and nitrogen deposition.
Keywords: sea-salt aerosol; particulate nitrate; mass-enhancement effect
DDC: 550
License: CC BY 4.0 Unported
Link to License: https://creativecommons.org/licenses/by/4.0/
Appears in Collections:Geowissenschaften

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Chen, Ying, Yafang Cheng, Nan Ma, Chao Wei, Liang Ran, Ralf Wolke, Johannes Größ, Qiaoqiao Wang, Hugo A. C. Denier van der Gon, Gerald Spindler, Jos Lelieveld, Ina Tegen, Hang Su and Alfred Wiedensohler, 2020. Natural sea-salt emissions moderate the climate forcing of anthropogenic nitrate. 2020. Katlenburg-Lindau : EGU
Chen Y, Cheng Y, Ma N, et al. Natural sea-salt emissions moderate the climate forcing of anthropogenic nitrate. 2020; 20. doi:https://doi.org/10.5194/acp-20-771-2020
Chen Y, Cheng Y, Ma N, Wei C, Ran L, Wolke R, Größ J, Wang Q, Denier van der Gon H A C, Spindler G, Lelieveld J, Tegen I, Su H, Wiedensohler A (2020) Natural sea-salt emissions moderate the climate forcing of anthropogenic nitrate. 20
Chen, Y., Cheng, Y., Ma, N., Wei, C., Ran, L., Wolke, R., Größ, J., Wang, Q., Denier van der Gon, H. A. C., Spindler, G., Lelieveld, J., Tegen, I., Su, H. & Wiedensohler, A. Natural sea-salt emissions moderate the climate forcing of anthropogenic nitrate. vol. 20 (2020).
Y. Chen, Y. Cheng, N. Ma, C. Wei, L. Ran, R. Wolke, J. Größ, Q. Wang, H. A. C. Denier van der Gon, G. Spindler, J. Lelieveld, I. Tegen, H. Su, A. Wiedensohler, Natural sea-salt emissions moderate the climate forcing of anthropogenic nitrate. 20 (2020), doi:https://doi.org/10.5194/acp-20-771-2020.
Y. Chen, Y. Cheng, N. Ma, C. Wei, L. Ran, R. Wolke, J. Größ, Q. Wang, H. A. C. Denier van der Gon, G. Spindler, J. Lelieveld, I. Tegen, H. Su and A. Wiedensohler, 2020, 20.
Y. Chen et al., “Natural sea-salt emissions moderate the climate forcing of anthropogenic nitrate,” vol. 20, no. 2. Katlenburg-Lindau : EGU, 2020, doi: https://doi.org/10.5194/acp-20-771-2020.


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