Influence of More Mechanistic Representation of Particle Dry Deposition on 1850–2000 Changes in Global Aerosol Burdens and Radiative Forcing
Abstract Robust estimates of historical changes in aerosols are key for accurate constraints on climate sensitivity. Dry deposition is a primary sink of aerosols from the atmosphere. However, most global climate models do not accurately represent observed strong dependencies of dry deposition follow...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
American Geophysical Union (AGU)
2024-03-01
|
| Series: | Journal of Advances in Modeling Earth Systems |
| Subjects: | |
| Online Access: | https://doi.org/10.1029/2023MS003952 |
| _version_ | 1797222064767107072 |
|---|---|
| author | Olivia E. Clifton Susanne E. Bauer Kostas Tsigaridis Igor Aleinov Tyler G. Cowan Gregory Faluvegi Maxwell Kelley |
| author_facet | Olivia E. Clifton Susanne E. Bauer Kostas Tsigaridis Igor Aleinov Tyler G. Cowan Gregory Faluvegi Maxwell Kelley |
| author_sort | Olivia E. Clifton |
| collection | DOAJ |
| description | Abstract Robust estimates of historical changes in aerosols are key for accurate constraints on climate sensitivity. Dry deposition is a primary sink of aerosols from the atmosphere. However, most global climate models do not accurately represent observed strong dependencies of dry deposition following turbulent transport on aerosol size. It is unclear whether there is a substantial impact of mischaracterized aerosol deposition velocities on historical aerosol changes. Here we describe improved mechanistic representation of aerosol dry deposition in the NASA Goddard Institute for Space Studies (GISS) global climate model, ModelE, and illustrate the impact on 1850–2000 changes in global aerosol burdens as well as aerosol direct and cloud albedo effects using a set of 1850 and 2000 time slice simulations. We employ two aerosol configurations of ModelE (a “bulk” mass‐based configuration and a configuration that more explicitly represents aerosol size distributions, internal mixing, and microphysics) to explore how model structural differences in aerosol representation alter the response to representation of dry deposition. Both configurations show larger historical increases in the global burdens of non‐dust aerosols with the new dry deposition scheme, by 11% in the simpler mass‐based configuration and 23% in the more complex microphysical configuration. Historical radiative forcing responses, which vary in magnitude from 5% to 12% as well as sign, depend on the aerosol configuration. |
| first_indexed | 2024-04-24T13:15:24Z |
| format | Article |
| id | doaj.art-cd3fd42589b44fa1bfc42fc21c74ff9c |
| institution | Directory Open Access Journal |
| issn | 1942-2466 |
| language | English |
| last_indexed | 2024-04-24T13:15:24Z |
| publishDate | 2024-03-01 |
| publisher | American Geophysical Union (AGU) |
| record_format | Article |
| series | Journal of Advances in Modeling Earth Systems |
| spelling | doaj.art-cd3fd42589b44fa1bfc42fc21c74ff9c2024-04-04T21:25:34ZengAmerican Geophysical Union (AGU)Journal of Advances in Modeling Earth Systems1942-24662024-03-01163n/an/a10.1029/2023MS003952Influence of More Mechanistic Representation of Particle Dry Deposition on 1850–2000 Changes in Global Aerosol Burdens and Radiative ForcingOlivia E. Clifton0Susanne E. Bauer1Kostas Tsigaridis2Igor Aleinov3Tyler G. Cowan4Gregory Faluvegi5Maxwell Kelley6NASA Goddard Institute for Space Studies New York NY USANASA Goddard Institute for Space Studies New York NY USANASA Goddard Institute for Space Studies New York NY USANASA Goddard Institute for Space Studies New York NY USANASA Goddard Institute for Space Studies New York NY USANASA Goddard Institute for Space Studies New York NY USANASA Goddard Institute for Space Studies New York NY USAAbstract Robust estimates of historical changes in aerosols are key for accurate constraints on climate sensitivity. Dry deposition is a primary sink of aerosols from the atmosphere. However, most global climate models do not accurately represent observed strong dependencies of dry deposition following turbulent transport on aerosol size. It is unclear whether there is a substantial impact of mischaracterized aerosol deposition velocities on historical aerosol changes. Here we describe improved mechanistic representation of aerosol dry deposition in the NASA Goddard Institute for Space Studies (GISS) global climate model, ModelE, and illustrate the impact on 1850–2000 changes in global aerosol burdens as well as aerosol direct and cloud albedo effects using a set of 1850 and 2000 time slice simulations. We employ two aerosol configurations of ModelE (a “bulk” mass‐based configuration and a configuration that more explicitly represents aerosol size distributions, internal mixing, and microphysics) to explore how model structural differences in aerosol representation alter the response to representation of dry deposition. Both configurations show larger historical increases in the global burdens of non‐dust aerosols with the new dry deposition scheme, by 11% in the simpler mass‐based configuration and 23% in the more complex microphysical configuration. Historical radiative forcing responses, which vary in magnitude from 5% to 12% as well as sign, depend on the aerosol configuration.https://doi.org/10.1029/2023MS003952aerosoldry depositionclimateaerosol microphysicshistorical changes |
| spellingShingle | Olivia E. Clifton Susanne E. Bauer Kostas Tsigaridis Igor Aleinov Tyler G. Cowan Gregory Faluvegi Maxwell Kelley Influence of More Mechanistic Representation of Particle Dry Deposition on 1850–2000 Changes in Global Aerosol Burdens and Radiative Forcing Journal of Advances in Modeling Earth Systems aerosol dry deposition climate aerosol microphysics historical changes |
| title | Influence of More Mechanistic Representation of Particle Dry Deposition on 1850–2000 Changes in Global Aerosol Burdens and Radiative Forcing |
| title_full | Influence of More Mechanistic Representation of Particle Dry Deposition on 1850–2000 Changes in Global Aerosol Burdens and Radiative Forcing |
| title_fullStr | Influence of More Mechanistic Representation of Particle Dry Deposition on 1850–2000 Changes in Global Aerosol Burdens and Radiative Forcing |
| title_full_unstemmed | Influence of More Mechanistic Representation of Particle Dry Deposition on 1850–2000 Changes in Global Aerosol Burdens and Radiative Forcing |
| title_short | Influence of More Mechanistic Representation of Particle Dry Deposition on 1850–2000 Changes in Global Aerosol Burdens and Radiative Forcing |
| title_sort | influence of more mechanistic representation of particle dry deposition on 1850 2000 changes in global aerosol burdens and radiative forcing |
| topic | aerosol dry deposition climate aerosol microphysics historical changes |
| url | https://doi.org/10.1029/2023MS003952 |
| work_keys_str_mv | AT oliviaeclifton influenceofmoremechanisticrepresentationofparticledrydepositionon18502000changesinglobalaerosolburdensandradiativeforcing AT susanneebauer influenceofmoremechanisticrepresentationofparticledrydepositionon18502000changesinglobalaerosolburdensandradiativeforcing AT kostastsigaridis influenceofmoremechanisticrepresentationofparticledrydepositionon18502000changesinglobalaerosolburdensandradiativeforcing AT igoraleinov influenceofmoremechanisticrepresentationofparticledrydepositionon18502000changesinglobalaerosolburdensandradiativeforcing AT tylergcowan influenceofmoremechanisticrepresentationofparticledrydepositionon18502000changesinglobalaerosolburdensandradiativeforcing AT gregoryfaluvegi influenceofmoremechanisticrepresentationofparticledrydepositionon18502000changesinglobalaerosolburdensandradiativeforcing AT maxwellkelley influenceofmoremechanisticrepresentationofparticledrydepositionon18502000changesinglobalaerosolburdensandradiativeforcing |