{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/99131"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/99131","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Sensitivity of black carbon aging to modeling assumption in CAM-chem","abstract":"Black carbon (BC) aerosol strongly absorbs visible light and therefore has a warming impact on climate. Quantifying this impact requires us to develop faithful model representations of its climate-relevant properties, such as CCN activity and optical properties. One key process that needs to be captured is the BC aging process, that is the conversion of fresh, hydrophobic black carbon into aged, hydrophilic black carbon, which directly contributes to CCN activation and wet removal and impacts black carbons optical properties. In current models, the BC aging timescale is either assumed to be a fixed value (1-2 days) or is deter- mined with mechanistic transfer rates based on ad hoc aging aging criteria. Both approaches are very sensitive to the choices of assumed parameters. The goal of this study is to explore the sensitivity of the simulated BC burden and BC radiative forcing to the aging criterion used in CAMChem, and to compare BC aging rates in CAMChem to an aging parameterization based on more detailed particle-resolved simulations with PartMC-MOSAIC. We carried out a 1-year simulation with the global CAMChem model, where a 4-mode modal aerosol model is used. BC aerosol is transferred from a fresh, hydrophobic mode (primary carbon mode) to an aged, hydrophilic mode (accumulation mode) after condensing a certain amount of secondary materials or through coagulation. Our results show that the simulated BC burden is most sensitive to the choices of the aging criterion in the high-latitude regions, with maximum differences in the annual averaged BC mixing ratio of 93% near the surface. We also noted that SP2 instrument can capture most of BC when it is close to the source regions (internally mixed), and in the Arctic (externally mixed). The aging timescales in the CAMChem model range from less than one hour (South America) to several days (over the ocean) and these values are broadly consistent with the aging timescales from the PartMC-MOSAIC parameterization.","abstract_html":"Black carbon (BC) aerosol strongly absorbs visible light and therefore has a warming impact on climate. Quantifying this impact requires us to develop faithful model representations of its climate-relevant properties, such as CCN activity and optical properties. One key process that needs to be captured is the BC aging process, that is the conversion of fresh, hydrophobic black carbon into aged, hydrophilic black carbon, which directly contributes to CCN activation and wet removal and impacts black carbons optical properties. In current models, the BC aging timescale is either assumed to be a fixed value (1-2 days) or is deter- mined with mechanistic transfer rates based on ad hoc aging aging criteria. Both approaches are very sensitive to the choices of assumed parameters. The goal of this study is to explore the sensitivity of the simulated BC burden and BC radiative forcing to the aging criterion used in CAMChem, and to compare BC aging rates in CAMChem to an aging parameterization based on more detailed particle-resolved simulations with PartMC-MOSAIC. We carried out a 1-year simulation with the global CAMChem model, where a 4-mode modal aerosol model is used. BC aerosol is transferred from a fresh, hydrophobic mode (primary carbon mode) to an aged, hydrophilic mode (accumulation mode) after condensing a certain amount of secondary materials or through coagulation. Our results show that the simulated BC burden is most sensitive to the choices of the aging criterion in the high-latitude regions, with maximum differences in the annual averaged BC mixing ratio of 93% near the surface. We also noted that SP2 instrument can capture most of BC when it is close to the source regions (internally mixed), and in the Arctic (externally mixed). The aging timescales in the CAMChem model range from less than one hour (South America) to several days (over the ocean) and these values are broadly consistent with the aging timescales from the PartMC-MOSAIC parameterization.","abstract_has_math":false,"creators":["Li, Yinrui"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Atmospheric Sciences","degree_department":null,"school":null,"contributors":["Riemer, Nicole","Wuebbles, Donald J."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2018,"date_issued":"2018-03-02T20:02:36Z","date_published":"2018-03-02T20:02:36Z","updated_at":"2026-07-22T22:24:37Z","subjects":["Black carbon","Sensitivity","Aging","Community Atmosphere Model with Chemistry (CAM-chem)","Modal Aerosol Model (MAM4)","Particle Monte Carlo Model for Simulating Aerosol Interactions and Chemistry (PartMC-MOSAIC)"],"languages":["en"],"rights":["Copyright 2017 Yinrui Li"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/99131","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Riemer, Nicole","Wuebbles, Donald J."]},{"key":"dc:creator","label":"Author","values":["Li, Yinrui"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2018-03-02T20:02:36Z","2020-03-03T10:15:29Z","2017-07-20","2017-08"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Atmospheric Sciences"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Black carbon","Sensitivity","Aging","Community Atmosphere Model with Chemistry (CAM-chem)","Modal Aerosol Model (MAM4)","Particle Monte Carlo Model for Simulating Aerosol Interactions and Chemistry (PartMC-MOSAIC)"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2017 Yinrui Li"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/99131"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Black carbon (BC) aerosol strongly absorbs visible light and therefore has a warming impact on climate. Quantifying this impact requires us to develop faithful model representations of its climate-relevant properties, such as CCN activity and optical properties. One key process that needs to be captured is the BC aging process, that is the conversion of fresh, hydrophobic black carbon into aged, hydrophilic black carbon, which directly contributes to CCN activation and wet removal and impacts black carbons optical properties. In current models, the BC aging timescale is either assumed to be a fixed value (1-2 days) or is deter- mined with mechanistic transfer rates based on ad hoc aging aging criteria. Both approaches are very sensitive to the choices of assumed parameters. The goal of this study is to explore the sensitivity of the simulated BC burden and BC radiative forcing to the aging criterion used in CAMChem, and to compare BC aging rates in CAMChem to an aging parameterization based on more detailed particle-resolved simulations with PartMC-MOSAIC. We carried out a 1-year simulation with the global CAMChem model, where a 4-mode modal aerosol model is used. BC aerosol is transferred from a fresh, hydrophobic mode (primary carbon mode) to an aged, hydrophilic mode (accumulation mode) after condensing a certain amount of secondary materials or through coagulation. Our results show that the simulated BC burden is most sensitive to the choices of the aging criterion in the high-latitude regions, with maximum differences in the annual averaged BC mixing ratio of 93% near the surface. We also noted that SP2 instrument can capture most of BC when it is close to the source regions (internally mixed), and in the Arctic (externally mixed). The aging timescales in the CAMChem model range from less than one hour (South America) to several days (over the ocean) and these values are broadly consistent with the aging timescales from the PartMC-MOSAIC parameterization.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2019-08-01","The student, Yinrui Li, accepted the attached license on 2017-07-19 at 20:57.","The student, Yinrui Li, submitted this Thesis for approval on 2017-07-19 at 21:11.","This Thesis was approved for publication on 2017-07-20 at 09:05.","DSpace SAF Submission Ingestion Package generated from Vireo submission #11540 on 2018-03-02 at 13:02:44","Made available in DSpace on 2018-03-02T20:02:36Z (GMT). No. of bitstreams: 2 LI-THESIS-2017.pdf: 10991042 bytes, checksum: bf48ac9719eb4cefdb1c3ba9054d3154 (MD5) LICENSE.txt: 4206 bytes, checksum: b6331c80f7d05e1b44804117406aa025 (MD5) Previous issue date: 2017-07-20","Embargo set by: Seth Robbins for item 105086 Lift date: 2020-03-02T20:02:46Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","U of I Only Restriction Lifted for Item 105086 on 2020-03-03T10:15:29Z."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Sensitivity of black carbon aging to modeling assumption in CAM-chem"]}]}],"canonical_facts":{"dc:contributor":["Riemer, Nicole","Wuebbles, Donald J."],"dc:creator":["Li, Yinrui"],"dc:date":["2018-03-02T20:02:36Z","2020-03-03T10:15:29Z","2017-07-20","2017-08"],"dc:description":["Black carbon (BC) aerosol strongly absorbs visible light and therefore has a warming impact on climate. Quantifying this impact requires us to develop faithful model representations of its climate-relevant properties, such as CCN activity and optical properties. One key process that needs to be captured is the BC aging process, that is the conversion of fresh, hydrophobic black carbon into aged, hydrophilic black carbon, which directly contributes to CCN activation and wet removal and impacts black carbons optical properties. In current models, the BC aging timescale is either assumed to be a fixed value (1-2 days) or is deter- mined with mechanistic transfer rates based on ad hoc aging aging criteria. Both approaches are very sensitive to the choices of assumed parameters. The goal of this study is to explore the sensitivity of the simulated BC burden and BC radiative forcing to the aging criterion used in CAMChem, and to compare BC aging rates in CAMChem to an aging parameterization based on more detailed particle-resolved simulations with PartMC-MOSAIC. We carried out a 1-year simulation with the global CAMChem model, where a 4-mode modal aerosol model is used. BC aerosol is transferred from a fresh, hydrophobic mode (primary carbon mode) to an aged, hydrophilic mode (accumulation mode) after condensing a certain amount of secondary materials or through coagulation. Our results show that the simulated BC burden is most sensitive to the choices of the aging criterion in the high-latitude regions, with maximum differences in the annual averaged BC mixing ratio of 93% near the surface. We also noted that SP2 instrument can capture most of BC when it is close to the source regions (internally mixed), and in the Arctic (externally mixed). The aging timescales in the CAMChem model range from less than one hour (South America) to several days (over the ocean) and these values are broadly consistent with the aging timescales from the PartMC-MOSAIC parameterization.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2019-08-01","The student, Yinrui Li, accepted the attached license on 2017-07-19 at 20:57.","The student, Yinrui Li, submitted this Thesis for approval on 2017-07-19 at 21:11.","This Thesis was approved for publication on 2017-07-20 at 09:05.","DSpace SAF Submission Ingestion Package generated from Vireo submission #11540 on 2018-03-02 at 13:02:44","Made available in DSpace on 2018-03-02T20:02:36Z (GMT). No. of bitstreams: 2 LI-THESIS-2017.pdf: 10991042 bytes, checksum: bf48ac9719eb4cefdb1c3ba9054d3154 (MD5) LICENSE.txt: 4206 bytes, checksum: b6331c80f7d05e1b44804117406aa025 (MD5) Previous issue date: 2017-07-20","Embargo set by: Seth Robbins for item 105086 Lift date: 2020-03-02T20:02:46Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","U of I Only Restriction Lifted for Item 105086 on 2020-03-03T10:15:29Z."],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/99131"],"dc:language":["en"],"dc:rights":["Copyright 2017 Yinrui Li"],"dc:subject":["Black carbon","Sensitivity","Aging","Community Atmosphere Model with Chemistry (CAM-chem)","Modal Aerosol Model (MAM4)","Particle Monte Carlo Model for Simulating Aerosol Interactions and Chemistry (PartMC-MOSAIC)"],"dc:title":["Sensitivity of black carbon aging to modeling assumption in CAM-chem"],"dc:type":["text"],"thesis:degree_discipline":["Atmospheric Sciences"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:37Z"}