TY - JOUR
T1 - Characterizing the Atmospheric Mn Cycle and Its Impact on Terrestrial Biogeochemistry
AU - Lu, Louis
AU - Li, Longlei
AU - Rathod, Sagar
AU - Hess, Peter
AU - Martínez, Carmen
AU - Fernandez, Nicole
AU - Goodale, Christine
AU - Thies, Janice
AU - Wong, Michelle Y.
AU - Alaimo, Maria Grazia
AU - Artaxo, Paulo
AU - Barraza, Francisco
AU - Barreto, Africa
AU - Beddows, David
AU - Chellam, Shankarararman
AU - Chen, Ying
AU - Chuang, Patrick
AU - Cohen, David D.
AU - Dongarrà, Gaetano
AU - Gaston, Cassandra
AU - Gómez, Darío
AU - Morera‐Gómez, Yasser
AU - Hakola, Hannele
AU - Hand, Jenny
AU - Harrison, Roy
AU - Hopke, Philip
AU - Hueglin, Christoph
AU - Kuang, Yuan‐Wen
AU - Kyllönen, Katriina
AU - Lambert, Fabrice
AU - Maenhaut, Willy
AU - Martin, Randall
AU - Paytan, Adina
AU - Prospero, Joseph
AU - González, Yenny
AU - Rodriguez, Sergio
AU - Smichowski, Patricia
AU - Varrica, Daniela
AU - Walsh, Brenna
AU - Weagle, Crystal
AU - Xiao, Yi‐Hua
AU - Mahowald, Natalie
N1 - Acknowledgments:
NMM and LL would like to acknowledge the support of DOE Grant: DE-SC0021302. SR acknowledges the support of Grants AEROEXTREME PID2021-125669NB-I00, AEROATLAN CGL 2015-66299-P & POLLINDUST CGL2011-26259 funded by ERDF and the Research State Agency of Spain.
PY - 2024/4
Y1 - 2024/4
N2 - The role of manganese (Mn) in ecosystem carbon (C) biogeochemical cycling is gaining increasing attention. While soil Mn is mainly derived from bedrock, atmospheric deposition could be a major source of Mn to surface soils, with implications for soil C cycling. However, quantification of the atmospheric Mn cycle, which comprises emissions from natural (desert dust, sea salts, volcanoes, primary biogenic particles, and wildfires) and anthropogenic sources (e.g., industrialization and land-use change due to agriculture), transport, and deposition, remains uncertain. Here, we use compiled emission data sets for each identified source to model and quantify the atmospheric Mn cycle by combining an atmospheric model and in situ atmospheric concentration measurements. We estimated global emissions of atmospheric Mn in aerosols ( <10 μm in aerodynamic diameter) to be 1,400 Gg Mn year−1. Approximately 31% of the emissions come from anthropogenic sources. Deposition of the anthropogenic Mn shortened Mn “pseudo” turnover times in 1-m-thick surface soils (ranging from 1,000 to over 10,000,000 years) by 1–2 orders of magnitude in industrialized regions. Such anthropogenic Mn inputs boosted the Mn-to-N ratio of the atmospheric deposition in non-desert dominated regions (between 5 × 10−5 and 0.02) across industrialized areas, but that was still lower than soil Mn-to-N ratio by 1–3 orders of magnitude. Correlation analysis revealed a negative relationship between Mn deposition and topsoil C density across temperate and (sub)tropical forests, consisting with atmospheric Mn deposition enhancing carbon respiration as seen in in situ biogeochemical studies.
AB - The role of manganese (Mn) in ecosystem carbon (C) biogeochemical cycling is gaining increasing attention. While soil Mn is mainly derived from bedrock, atmospheric deposition could be a major source of Mn to surface soils, with implications for soil C cycling. However, quantification of the atmospheric Mn cycle, which comprises emissions from natural (desert dust, sea salts, volcanoes, primary biogenic particles, and wildfires) and anthropogenic sources (e.g., industrialization and land-use change due to agriculture), transport, and deposition, remains uncertain. Here, we use compiled emission data sets for each identified source to model and quantify the atmospheric Mn cycle by combining an atmospheric model and in situ atmospheric concentration measurements. We estimated global emissions of atmospheric Mn in aerosols ( <10 μm in aerodynamic diameter) to be 1,400 Gg Mn year−1. Approximately 31% of the emissions come from anthropogenic sources. Deposition of the anthropogenic Mn shortened Mn “pseudo” turnover times in 1-m-thick surface soils (ranging from 1,000 to over 10,000,000 years) by 1–2 orders of magnitude in industrialized regions. Such anthropogenic Mn inputs boosted the Mn-to-N ratio of the atmospheric deposition in non-desert dominated regions (between 5 × 10−5 and 0.02) across industrialized areas, but that was still lower than soil Mn-to-N ratio by 1–3 orders of magnitude. Correlation analysis revealed a negative relationship between Mn deposition and topsoil C density across temperate and (sub)tropical forests, consisting with atmospheric Mn deposition enhancing carbon respiration as seen in in situ biogeochemical studies.
KW - Mn deposition
KW - C turnover
KW - atmospheric Mn cycle
KW - aerosol modeling
KW - Community Earth System Model (CESM)
KW - terrestial ecosystem
U2 - 10.1029/2023gb007967
DO - 10.1029/2023gb007967
M3 - Article
SN - 0886-6236
VL - 38
JO - Global Biogeochemical Cycles
JF - Global Biogeochemical Cycles
IS - 4
M1 - e2023GB007967
ER -