edu.ucar.opensky::articles:27129 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-24T18:54:56.674910 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7f47t95 https://doi.org/10.3334/ORNLDAAC/1716 https Related Dataset #1 ATom: L2 Measurements from CU High-Resolution Aerosol Mass Spectrometer (HR-AMS) https://doi.org/10.7302/rp59-rw53 https Related Dataset #2 Simulated CO2 and tracer concentrations in the Northern Hemisphere from a tagged transport model GEOS-Chem v12.0.0 Observationally constrained analysis of sulfur cycle in the marine atmosphere with NASA ATom measurements and AeroCom model simulations 2024-02-07T00:00:00Z publication https://n2t.org/ark:/85065/d7f47t95 https://doi.org/10.5194/acp-24-1717-2024 Bian, H. author Chin, M. author Colarco, P. R. author Apel, Eric C. author Blake, D. R. author Froyd, K. author Hornbrook, Rebecca author Jimenez, J. author Jost, P. C. author Lawler, M. author Liu, M. author Lund, M. T. author Matsui, H. author Nault, B. A. author Penner, J. E. author Rollins, A. W. author Schill, G. author Skeie, R. B. author Wang, H. author Xu, L. author Zhang, K. author Zhu, J. author UCAR/NCAR - Library publisher The atmospheric sulfur cycle plays a key role in air quality, climate, and ecosystems, such as pollution, radiative forcing, new particle formation, and acid rain. In this study, we compare the spatially and temporally resolved measurements from the NASA Atmospheric Tomography (ATom) mission with simulations from five AeroCom III models for four sulfur species (dimethyl sulfide (DMS), sulfur dioxide (SO 2 ), particulate methanesulfonate (MSA), and particulate sulfate (SO 4 ) ). We focus on remote regions over the Pacific, Atlantic, and Southern oceans from near the surface to similar to 12 km altitude range covering all four seasons. In general, the differences among model results can be greater than 1 order of magnitude. Comparing with observations, model-simulated SO 2 is generally low, whereas SO 4 is generally high. Simulated DMS concentrations near the sea surface exceed observed levels by a factor of 5 in most cases, suggesting potential overestimation of DMS emissions in all models. With GEOS model simulations of tagging emission from anthropogenic, biomass burning, volcanic, and oceanic sources, we find that anthropogenic emissions are the dominant source of sulfate aerosol (40 %-60 % of the total amount) in the ATom measurements at almost all altitudes, followed by volcanic emissions (18 %-32 %) and oceanic sources (16 %-32 %). Similar source contributions can also be derived at broad ocean basins and on monthly scales, indicating the representativeness of ATom measurements for global ocean. Our work presents the first assessment of AeroCom sulfur study using ATom measurements, providing directions for improving sulfate simulations, which remain the largest uncertainty in radiative forcing estimates in aerosol climate models. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. None eng geoscientificInformation