{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/85977"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/85977","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Examining the Role of Climate, Carbon and Nitrogen Interactions in the Terrestrial Biosphere","abstract":"In the second part of this thesis, a comprehensive model of terrestrial nitrogen (N) dynamics is developed and coupled with the geographically explicit terrestrial C cycle model of ISAM. Observations from the Long-term Intersite Decomposition Experiment (LIDET) dataset were compiled for the calibration and validation of the decomposition submodel. The terrestrial C-N cycle model was then used to evaluate how the introduction of N dynamics and interactions between C, N and climate influences terrestrial C sources and sinks in response to changes over the 20th century in global environmental factors including atmospheric CO2 concentrations, N deposition, climate and land use. This study shows (i) The terrestrial C sink from CO2 fertilization effect is reduced due to the limitation of N (by 0.53GtC/yr in the 1990s), (ii) the positive feedback between climate warming and terrestrial C cycle is attenuated due to the interactions between C, N and climate (by 0.34 GtC/yr in the 1990s), (iii) an enhanced terrestrial sink associated with N deposition (of 0.26 GtC/yr in the 1990s) and (iv) an enhanced source associated with changes in land use due to N limitation (of 0.08 GtC/yr in the 1990s). This study also suggests that the C sink associated with increasing atmospheric CO2 in subtropics is overestimated and the C source associated with changes in temperature and precipitation in higher latitude regions is underestimated when terrestrial N dynamics are not considered. This study highlights the importance of including the N dynamics when assessing terrestrial C sources and sinks with coupled C-climate system models.","abstract_html":"In the second part of this thesis, a comprehensive model of terrestrial nitrogen (N) dynamics is developed and coupled with the geographically explicit terrestrial C cycle model of ISAM. Observations from the Long-term Intersite Decomposition Experiment (LIDET) dataset were compiled for the calibration and validation of the decomposition submodel. The terrestrial C-N cycle model was then used to evaluate how the introduction of N dynamics and interactions between C, N and climate influences terrestrial C sources and sinks in response to changes over the 20th century in global environmental factors including atmospheric CO2 concentrations, N deposition, climate and land use. This study shows (i) The terrestrial C sink from CO2 fertilization effect is reduced due to the limitation of N (by 0.53GtC/yr in the 1990s), (ii) the positive feedback between climate warming and terrestrial C cycle is attenuated due to the interactions between C, N and climate (by 0.34 GtC/yr in the 1990s), (iii) an enhanced terrestrial sink associated with N deposition (of 0.26 GtC/yr in the 1990s) and (iv) an enhanced source associated with changes in land use due to N limitation (of 0.08 GtC/yr in the 1990s). This study also suggests that the C sink associated with increasing atmospheric CO2 in subtropics is overestimated and the C source associated with changes in temperature and precipitation in higher latitude regions is underestimated when terrestrial N dynamics are not considered. This study highlights the importance of including the N dynamics when assessing terrestrial C sources and sinks with coupled C-climate system models.","abstract_has_math":false,"creators":["Yang, Xiaojuan"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Atmospheric Sciences","degree_department":null,"school":null,"contributors":["Atul Jain"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-28T14:52:25Z","date_published":"2015-09-28T14:52:25Z","updated_at":"2026-07-22T22:26:26Z","subjects":["Biogeochemistry"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(MiAaPQ)AAI3363120"],"render_values":[{"text":"(MiAaPQ)AAI3363120","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/85977","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Atul Jain"]},{"key":"dc:creator","label":"Author","values":["Yang, Xiaojuan"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-28T14:52:25Z","10000-01-01","2009"]},{"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":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"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":["Biogeochemistry"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/85977","(MiAaPQ)AAI3363120"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["In the second part of this thesis, a comprehensive model of terrestrial nitrogen (N) dynamics is developed and coupled with the geographically explicit terrestrial C cycle model of ISAM. Observations from the Long-term Intersite Decomposition Experiment (LIDET) dataset were compiled for the calibration and validation of the decomposition submodel. The terrestrial C-N cycle model was then used to evaluate how the introduction of N dynamics and interactions between C, N and climate influences terrestrial C sources and sinks in response to changes over the 20th century in global environmental factors including atmospheric CO2 concentrations, N deposition, climate and land use. This study shows (i) The terrestrial C sink from CO2 fertilization effect is reduced due to the limitation of N (by 0.53GtC/yr in the 1990s), (ii) the positive feedback between climate warming and terrestrial C cycle is attenuated due to the interactions between C, N and climate (by 0.34 GtC/yr in the 1990s), (iii) an enhanced terrestrial sink associated with N deposition (of 0.26 GtC/yr in the 1990s) and (iv) an enhanced source associated with changes in land use due to N limitation (of 0.08 GtC/yr in the 1990s). This study also suggests that the C sink associated with increasing atmospheric CO2 in subtropics is overestimated and the C source associated with changes in temperature and precipitation in higher latitude regions is underestimated when terrestrial N dynamics are not considered. 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Observations from the Long-term Intersite Decomposition Experiment (LIDET) dataset were compiled for the calibration and validation of the decomposition submodel. The terrestrial C-N cycle model was then used to evaluate how the introduction of N dynamics and interactions between C, N and climate influences terrestrial C sources and sinks in response to changes over the 20th century in global environmental factors including atmospheric CO2 concentrations, N deposition, climate and land use. This study shows (i) The terrestrial C sink from CO2 fertilization effect is reduced due to the limitation of N (by 0.53GtC/yr in the 1990s), (ii) the positive feedback between climate warming and terrestrial C cycle is attenuated due to the interactions between C, N and climate (by 0.34 GtC/yr in the 1990s), (iii) an enhanced terrestrial sink associated with N deposition (of 0.26 GtC/yr in the 1990s) and (iv) an enhanced source associated with changes in land use due to N limitation (of 0.08 GtC/yr in the 1990s). This study also suggests that the C sink associated with increasing atmospheric CO2 in subtropics is overestimated and the C source associated with changes in temperature and precipitation in higher latitude regions is underestimated when terrestrial N dynamics are not considered. This study highlights the importance of including the N dynamics when assessing terrestrial C sources and sinks with coupled C-climate system models.","Made available in DSpace on 2015-09-28T14:52:25Z (GMT). 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