AGU AdvancesPub Date : 2024-08-30DOI: 10.1029/2024AV001322
Dylan B. Millet, Paul I. Palmer, Pieternel F. Levelt, Laura Gallardo, Lerato Shikwambana
{"title":"Coordinated Geostationary, Multispectral Satellite Observations Are Critical for Climate and Air Quality Progress","authors":"Dylan B. Millet, Paul I. Palmer, Pieternel F. Levelt, Laura Gallardo, Lerato Shikwambana","doi":"10.1029/2024AV001322","DOIUrl":"https://doi.org/10.1029/2024AV001322","url":null,"abstract":"<p>Satellite observations are critical for air quality and climate monitoring, and for developing the process understanding needed for reliable planning and predictions. Our current space-based observing system stands at a crossroads with the early missions approaching their end-of-life. We articulate the challenges and needs to sustain and develop these environmental records into the future, focusing specifically on observations of gas-phase atmospheric composition.</p>","PeriodicalId":100067,"journal":{"name":"AGU Advances","volume":"5 5","pages":""},"PeriodicalIF":8.3,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024AV001322","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142100260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AGU AdvancesPub Date : 2024-08-23DOI: 10.1029/2023AV001151
Xin Huang, Lian Xue, Zilin Wang, Yawen Liu, Ke Ding, Aijun Ding
{"title":"Escalating Wildfires in Siberia Driven by Climate Feedbacks Under a Warming Arctic in the 21st Century","authors":"Xin Huang, Lian Xue, Zilin Wang, Yawen Liu, Ke Ding, Aijun Ding","doi":"10.1029/2023AV001151","DOIUrl":"https://doi.org/10.1029/2023AV001151","url":null,"abstract":"<p>Siberian wildfire is of paramount importance in the carbon cycle and climate change as it is a major disturbance in the pan-Arctic ecosystems. In recent decades, the Siberian wildfire regime has been shifting; however, less is known about its process-based feedback mechanisms. By integrating in-situ and satellite observational data sets as well as chemistry-climate coupled modeling, we find that central Siberia has featured the most prominent wildfire escalation during the past two decades, which is closely related to hydrological drought with decreasing rainfall and drying soil under a fast-warming Arctic. Furthermore, fire-emitted aerosols compound the increasing wildfires via serving as cloud condensation nuclei and suppressing precipitation, forming self-amplifying feedback. As the Arctic warming is projected to continue, wildfires are estimated to more than double by the end of this century. This work highlights the great importance of fire risk management based on a fundamental scientific understanding of the complex climate system.</p>","PeriodicalId":100067,"journal":{"name":"AGU Advances","volume":"5 4","pages":""},"PeriodicalIF":8.3,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023AV001151","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142045316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AGU AdvancesPub Date : 2024-08-17DOI: 10.1029/2023AV001000
Logan A. Tegler, Tristan J. Horner, Valier Galy, Shavonna M. Bent, Yi Wang, Heather H. Kim, Öykü Z. Mete, Sune G. Nielsen
{"title":"Distribution and Drivers of Organic Carbon Sedimentation Along the Continental Margins","authors":"Logan A. Tegler, Tristan J. Horner, Valier Galy, Shavonna M. Bent, Yi Wang, Heather H. Kim, Öykü Z. Mete, Sune G. Nielsen","doi":"10.1029/2023AV001000","DOIUrl":"https://doi.org/10.1029/2023AV001000","url":null,"abstract":"<p>Organic carbon (OC) sedimentation in marine sediments is the largest long-term sink of atmospheric CO<sub>2</sub> after silicate weathering. Understanding the mechanistic and quantitative aspects of OC delivery and preservation in marine sediments is critical for predicting the role of the oceans in modulating global climate. Yet, estimates of the global OC sedimentation in marginal settings span an order of magnitude, and the primary controls of OC preservation remain highly debated. Here, we provide the first global bottom-up estimate of OC sedimentation along the margins using a synthesis of literature data. We quantify both terrestrial- and marine-sourced OC fluxes and perform a statistical analysis to discern the key factors influencing their magnitude. We find that the margins host 23.2 ± 3.5 Tmol of OC sedimentation annually, with approximately 84% of marine origin. Accordingly, we calculate that only 2%–3% of OC exported from the euphotic zone escapes remineralization before sedimentation. Surprisingly, over half of all global OC sedimentation occurs below bottom waters with oxygen concentrations greater than 180 μM, while less than 4% occurs in settings with <50 μM oxygen. This challenges the prevailing paradigm that bottom-water oxygen (BWO) is the primary control on OC preservation. Instead, our statistical analysis reveals that water depth is the most significant predictor of OC sedimentation, surpassing all other factors investigated, including BWO levels and sea-surface chlorophyll concentrations. This finding suggests that the primary control on OC sedimentation is not production, but the ability of OC to resist remineralization during transit through the water column and while settling on the seafloor.</p>","PeriodicalId":100067,"journal":{"name":"AGU Advances","volume":"5 4","pages":""},"PeriodicalIF":8.3,"publicationDate":"2024-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023AV001000","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141994117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AGU AdvancesPub Date : 2024-08-14DOI: 10.1029/2024AV001187
Junjie Liu, Kevin Bowman, Paul I. Palmer, Joanna Joiner, Paul Levine, A. Anthony Bloom, Liang Feng, Sassan Saatchi, Michael Keller, Marcos Longo, David Schimel, Paul O. Wennberg
{"title":"Enhanced Carbon Flux Response to Atmospheric Aridity and Water Storage Deficit During the 2015–2016 El Niño Compromised Carbon Balance Recovery in Tropical South America","authors":"Junjie Liu, Kevin Bowman, Paul I. Palmer, Joanna Joiner, Paul Levine, A. Anthony Bloom, Liang Feng, Sassan Saatchi, Michael Keller, Marcos Longo, David Schimel, Paul O. Wennberg","doi":"10.1029/2024AV001187","DOIUrl":"https://doi.org/10.1029/2024AV001187","url":null,"abstract":"<p>During the 2015–2016 El Niño, the Amazon basin released almost one gigaton of carbon (GtC) into the atmosphere due to extreme temperatures and drought. The link between the drought impact and recovery of the total carbon pools and its biogeochemical drivers is still unknown. With satellite-constrained net carbon exchange and its component fluxes including gross primary production and fire emissions, we show that the total carbon loss caused by the 2015–2016 El Niño had not recovered by the end of 2018. Forest ecosystems over the Northeastern (NE) Amazon suffered a cumulative total carbon loss of ∼0.6 GtC through December 2018, driven primarily by a suppression of photosynthesis whereas southeastern savannah carbon loss was driven in part by fire. We attribute the slow recovery to the unexpected large carbon loss caused by the severe atmospheric aridity coupled with a water storage deficit during drought. We show the attenuation of carbon uptake is three times higher than expected from the pre-drought sensitivity to atmospheric aridity and ground water supply. Our study fills an important knowledge gap in our understanding of the unexpectedly enhanced response of carbon fluxes to atmospheric aridity and water storage deficit and its impact on regional post-drought recovery as a function of the vegetation types and climate perturbations. Our results suggest that the disproportionate impact of water supply and demand could compromise resiliency of the Amazonian carbon balance to future increases in extreme events.</p>","PeriodicalId":100067,"journal":{"name":"AGU Advances","volume":"5 4","pages":""},"PeriodicalIF":8.3,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024AV001187","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141985994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AGU AdvancesPub Date : 2024-08-14DOI: 10.1029/2024AV001241
T. Bosak, D. L. Shuster, E. L. Scheller, S. Siljeström, M. J. Zawaski, L. Mandon, J. I. Simon, B. P. Weiss, K. M. Stack, E. N. Mansbach, A. H. Treiman, K. C. Benison, A. J. Brown, A. D. Czaja, K. A. Farley, E. M. Hausrath, K. Hickman-Lewis, C. D. K. Herd, J. R. Johnson, L. E. Mayhew, M. E. Minitti, K. H. Williford, B. V. Wogsland, M.-P. Zorzano, A. C. Allwood, H. E. F. Amundsen, J. F. Bell III, K. Benzerara, S. Bernard, O. Beyssac, D. K. Buckner, M. Cable, F. Calef III, G. Caravaca, D. C. Catling, E. Clavé, E. Cloutis, B. A. Cohen, A. Cousin, E. Dehouck, A. G. Fairén, D. T. Flannery, T. Fornaro, O. Forni, T. Fouchet, E. Gibbons, F. Gomez Gomez, S. Gupta, K. P. Hand, J. A. Hurowitz, H. Kalucha, D. A. K. Pedersen, G. Lopes-Reyes, J. N. Maki, S. Maurice, J. I. Nuñez, N. Randazzo, J. W. Rice Jr., C. Royer, M. A. Sephton, S. Sharma, A. Steele, C. D. Tate, K. Uckert, A. Udry, R. C. Wiens, A. Williams
{"title":"Astrobiological Potential of Rocks Acquired by the Perseverance Rover at a Sedimentary Fan Front in Jezero Crater, Mars","authors":"T. Bosak, D. L. Shuster, E. L. Scheller, S. Siljeström, M. J. Zawaski, L. Mandon, J. I. Simon, B. P. Weiss, K. M. Stack, E. N. Mansbach, A. H. Treiman, K. C. Benison, A. J. Brown, A. D. Czaja, K. A. Farley, E. M. Hausrath, K. Hickman-Lewis, C. D. K. Herd, J. R. Johnson, L. E. Mayhew, M. E. Minitti, K. H. Williford, B. V. Wogsland, M.-P. Zorzano, A. C. Allwood, H. E. F. Amundsen, J. F. Bell III, K. Benzerara, S. Bernard, O. Beyssac, D. K. Buckner, M. Cable, F. Calef III, G. Caravaca, D. C. Catling, E. Clavé, E. Cloutis, B. A. Cohen, A. Cousin, E. Dehouck, A. G. Fairén, D. T. Flannery, T. Fornaro, O. Forni, T. Fouchet, E. Gibbons, F. Gomez Gomez, S. Gupta, K. P. Hand, J. A. Hurowitz, H. Kalucha, D. A. K. Pedersen, G. Lopes-Reyes, J. N. Maki, S. Maurice, J. I. Nuñez, N. Randazzo, J. W. Rice Jr., C. Royer, M. A. Sephton, S. Sharma, A. Steele, C. D. Tate, K. Uckert, A. Udry, R. C. Wiens, A. Williams","doi":"10.1029/2024AV001241","DOIUrl":"https://doi.org/10.1029/2024AV001241","url":null,"abstract":"<p>The Perseverance rover has collected seven oriented samples of sedimentary rocks, all likely older than the oldest signs of widespread life on Earth, at the exposed base of the western fan in Jezero crater, Mars. The samples include a sulfate- and clay-bearing mudstone and sandstone, a fluvial sandstone from a stratigraphically low position at the fan front, and a carbonate-bearing sandstone deposited above the sulfate-bearing strata. All samples contain aqueously precipitated materials and most or all were aqueously deposited. Although the rover instruments have not confidently detected organic matter in the rocks from the fan front, the much more sensitive terrestrial instruments will still be able to search for remnants of prebiotic chemistries and past life, and study Mars's past habitability in the samples returned to Earth. The hydrated, sulfate-bearing mudstone has the highest potential to preserve organic matter and biosignatures, whereas the carbonate-bearing sandstones can be used to constrain when and for how long Jezero crater contained liquid water. Returned sample science analyses of sulfate, carbonate, clay, phosphate and igneous minerals as well as trace metals and volatiles that are present in the samples acquired at the fan front would provide transformative insights into past habitable environments on Mars, the evolution of its magnetic field, atmosphere and climate and the past and present cycling of atmospheric and crustal water, sulfur and carbon.</p>","PeriodicalId":100067,"journal":{"name":"AGU Advances","volume":"5 4","pages":""},"PeriodicalIF":8.3,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024AV001241","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141986021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AGU AdvancesPub Date : 2024-08-13DOI: 10.1029/2023AV001145
Sudhanshu Pandey, John B. Miller, Sourish Basu, Junjie Liu, Brad Weir, Brendan Byrne, Frédéric Chevallier, Kevin W. Bowman, Zhiqiang Liu, Feng Deng, Christopher W. O’Dell, Abhishek Chatterjee
{"title":"Toward Low-Latency Estimation of Atmospheric CO2 Growth Rates Using Satellite Observations: Evaluating Sampling Errors of Satellite and In Situ Observing Approaches","authors":"Sudhanshu Pandey, John B. Miller, Sourish Basu, Junjie Liu, Brad Weir, Brendan Byrne, Frédéric Chevallier, Kevin W. Bowman, Zhiqiang Liu, Feng Deng, Christopher W. O’Dell, Abhishek Chatterjee","doi":"10.1029/2023AV001145","DOIUrl":"https://doi.org/10.1029/2023AV001145","url":null,"abstract":"<p>The atmospheric CO<sub>2</sub> growth rate is a fundamental measure of climate forcing. NOAA's growth rate estimates, derived from in situ observations at the marine boundary layer (MBL), serve as the benchmark in policy and science. However, NOAA's MBL-based method encounters challenges in accurately estimating the whole-atmosphere CO<sub>2</sub> growth rate at sub-annual scales. Here we introduce the Growth Rate from Satellite Observations (GRESO) method as a complementary approach to estimate the whole-atmosphere CO<sub>2</sub> growth rate utilizing satellite data. Satellite CO<sub>2</sub> observations offer extensive atmospheric coverage that extends the capability of the current NOAA benchmark. We assess the sampling errors of the GRESO and NOAA methods using 10 atmospheric transport model simulations. The simulations generate synthetic OCO-2 satellite and NOAA MBL data for calculating CO<sub>2</sub> growth rates, which are compared against the global sum of carbon fluxes used as model inputs. We find good performance for the NOAA method (R = 0.93, RMSE = 0.12 ppm year<sup>−1</sup> or 0.25 PgC year<sup>−1</sup>). GRESO demonstrates lower sampling errors (R = 1.00; RMSE = 0.04 ppm year<sup>−1</sup> or 0.09 PgC year<sup>−1</sup>). Additionally, GRESO shows better performance at monthly scales than the NOAA method (R = 0.76 vs. 0.47, respectively). Due to CO<sub>2</sub>'s atmospheric longevity, the NOAA method accurately captures growth rates over 5-year intervals. GRESO's robustness across partial coverage configurations (ocean or land data) shows that satellites can be promising tools for low-latency CO<sub>2</sub> growth rate information, provided the systematic biases are minimized using in situ observations. Along with accurate and calibrated NOAA in situ data, satellite-derived growth rates can provide information about the global carbon cycle at sub-annual scales.</p>","PeriodicalId":100067,"journal":{"name":"AGU Advances","volume":"5 4","pages":""},"PeriodicalIF":8.3,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023AV001145","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141973718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AGU AdvancesPub Date : 2024-08-10DOI: 10.1029/2024AV001265
Michael S. Thorne, Surya Pachhai, Mingming Li, Jamie Ward, Sebastian Rost
{"title":"Investigating Ultra-Low Velocity Zones as Sources of PKP Scattering Beneath North America and the Western Pacific Ocean: Potential Links to Subducted Oceanic Crust","authors":"Michael S. Thorne, Surya Pachhai, Mingming Li, Jamie Ward, Sebastian Rost","doi":"10.1029/2024AV001265","DOIUrl":"https://doi.org/10.1029/2024AV001265","url":null,"abstract":"<p>Seismic energy arriving before the compressional (P) wave passing through the core (PKP), called PKP precursors, have been detected for decades, but the origin of those arrivals is ambiguous. The largest amplitude arrivals are linked to scattering at small-scale lowermost mantle structure, but because these arrivals traverse both source and receiver sides of the mantle, it is unknown which side of the path the energy is scattered from. To address this ambiguity, we apply a new seismic array method to analyze PKP waveforms from 58 earthquakes recorded in North America that allows localization of the origin of the PKP precursors at the core-mantle boundary (CMB). We compare these measurements with high frequency 2.5-D synthetic predictions showing that the PKP precursors are most likely associated with ultra-low velocity zone structures beneath the western Pacific and North America. The most feasible scenario to generate ULVZs in both locations is through melting of mid-ocean ridge basalt in subducted oceanic crust.</p>","PeriodicalId":100067,"journal":{"name":"AGU Advances","volume":"5 4","pages":""},"PeriodicalIF":8.3,"publicationDate":"2024-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024AV001265","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141967822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AGU AdvancesPub Date : 2024-08-01DOI: 10.1029/2024AV001267
Basile Poujol, Sandrine Bony
{"title":"Measuring Clear-Air Vertical Motions From Space","authors":"Basile Poujol, Sandrine Bony","doi":"10.1029/2024AV001267","DOIUrl":"https://doi.org/10.1029/2024AV001267","url":null,"abstract":"<p>Measuring vertical velocity in the atmosphere has long been a challenge due to its small magnitude. Taking advantage of the modulation of free tropospheric relative humidity by vertical motions, we derive analytical relationships that allow us to retrieve vertical motions in clear air from geostationary measurements of brightness temperature in the infrared absorption band of water vapor. The new observations have a resolution of 1 hr and 2 km in time and space, respectively. They capture the variability of mesoscale and large-scale vertical velocity measured during field campaigns. In the mid-troposphere, clear-sky vertical motions are mostly subsiding but highly heterogeneous in space and time. Around organized deep convective systems, strong subsidence (>500 hPa·day<sup>−1</sup>) is observed within a distance of a few hundred kilometers. In contrast, transient upward motions of up to 100 hPa·day<sup>−1</sup> can occur at the mesoscale. Vertical motions in the clear-sky atmosphere appear to be primarily associated with buoyancy and gravity waves at the mesoscale, and with radiative cooling and equatorial waves at larger spatial scales. This new retrieval reveals a rich range of dynamical features that were previously invisible, thus shedding new light on tropical meteorology.</p>","PeriodicalId":100067,"journal":{"name":"AGU Advances","volume":"5 4","pages":""},"PeriodicalIF":8.3,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024AV001267","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141966704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AGU AdvancesPub Date : 2024-07-25DOI: 10.1029/2024AV001215
Michael J. Lawler, Gregory P. Schill, Charles A. Brock, Karl D. Froyd, Christina Williamson, Agnieszka Kupc, Daniel M. Murphy
{"title":"Sea Spray Aerosol Over the Remote Oceans Has Low Organic Content","authors":"Michael J. Lawler, Gregory P. Schill, Charles A. Brock, Karl D. Froyd, Christina Williamson, Agnieszka Kupc, Daniel M. Murphy","doi":"10.1029/2024AV001215","DOIUrl":"10.1029/2024AV001215","url":null,"abstract":"<p>Biogenic organic compounds in the surface ocean may significantly alter the cloud-forming ability of sea spray aerosol and thereby affect the amount of solar radiation reaching the ocean surface. Estimates of the organic mass fraction of sea spray vary widely, and some results show a significant dependence on biological activity in the source seawater. We present airborne observations of the organic mass fraction of individual sea spray particles measured using the Particle Analysis by Laser Mass Spectrometry (PALMS) instrument during the Atmospheric Tomography (ATom) mission, which sampled a wide range of latitudes and altitudes over the remote Atlantic and Pacific Oceans across four seasons, from the marine boundary layer to the upper troposphere. The measured sea spray particles of about 0.15–0.7 μm dry diameter showed higher average organic mass fractions at smaller sizes, but values were low overall, with regional integrated submicron means almost always <10%. Atmospheric aging adds organics to sea spray particles, leading to higher mean organic mass fractions (sometimes exceeding 50%) in the free troposphere than in the marine boundary layer. The average submicron sea spray organic mass fractions are on the low end of previously reported values and show weak seasonal variability for most regions. These results imply that recent biological activity in the surface ocean has only weak control over how much organic matter is in nascent submicron sea spray particles over the remote oceans, in contrast to findings from some observational studies and global numerical simulations.</p>","PeriodicalId":100067,"journal":{"name":"AGU Advances","volume":"5 4","pages":""},"PeriodicalIF":8.3,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024AV001215","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141802407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AGU AdvancesPub Date : 2024-07-22DOI: 10.1029/2024AV001238
Guangjie Zheng, Hang Su, Meinrat O. Andreae, Ulrich Pöschl, Yafang Cheng
{"title":"Multiphase Buffering by Ammonia Sustains Sulfate Production in Atmospheric Aerosols","authors":"Guangjie Zheng, Hang Su, Meinrat O. Andreae, Ulrich Pöschl, Yafang Cheng","doi":"10.1029/2024AV001238","DOIUrl":"https://doi.org/10.1029/2024AV001238","url":null,"abstract":"<p>Multiphase oxidation of sulfur dioxide (SO<sub>2</sub>) is an important source of sulfate in the atmosphere. There are, however, concerns that protons produced during SO<sub>2</sub> oxidation may cause rapid acidification of aerosol water and thereby quickly shut down the fast reactions favored at high pH. Here, we show that the sustainability of sulfate production is controlled by the competing effects of multiphase buffering and acidification, which can be well described by a characteristic buffering time, <i>τ</i><sub>buff</sub>. Both GEOS-Chem simulations and observations show that globally, <i>τ</i><sub>buff</sub> is long enough (days) to sustain sulfate production over most populated regions, where the acidification of aerosol water is counteracted by the strong buffering effect of NH<sub>4</sub><sup>+</sup>/NH<sub>3</sub>. Our results highlight the importance of anthropogenic ammonia emissions and pervasive human influences in shaping the chemical environment of the atmosphere.</p>","PeriodicalId":100067,"journal":{"name":"AGU Advances","volume":"5 4","pages":""},"PeriodicalIF":8.3,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024AV001238","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141968047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}