Riverine Dissolved Inorganic Carbon Export From the Southeast Alaskan Drainage Basin With Implications for Coastal Ocean Processes. Harley, J. R., Biles, F. E., Brooks, M. K., Fellman, J., Hood, E., & D’Amore, D. V. Journal of Geophysical Research: Biogeosciences, 128(10):e2023JG007609, October, 2023. ![Riverine Dissolved Inorganic Carbon Export From the Southeast Alaskan Drainage Basin With Implications for Coastal Ocean Processes [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Abstract Dissolved inorganic carbon (DIC) represents an important but poorly constrained form of lateral carbon flux to the oceans. With high precipitation rates, large glaciers, and dense temperate rainforest, Southeast Alaska plays a critical role in the transport of carbon to the Gulf of Alaska (GOA). Previous estimates of DIC flux across the Southeast Alaska Drainage Basin (SEAKDB) are poorly constrained in space and time. Our goal was to incorporate recent measurements of DIC concentrations with previous measurements from the U.S. Geological Survey in order to model the spatial and temporal patterns of riverine DIC transport from SEAK to the GOA. We aggregated DIC concentration measurements from 1957 to 2020 and associated measurements of mean daily discharge. We then constructed load estimation models to generate concentration predictions across 24 watersheds. By spatially matching measurements of DIC with SEAKDB watersheds, we extrapolated concentration predictions across 2,455 watersheds encompassing approximately 190,000 km 2 . Models were aggregated according to two factors, the presence of karst and the discharge regime. Finally, monthly flux predictions were generated for each watershed using predicted concentrations and runoff estimates from the Distributed Climate Water Balance Model. Mean annual DIC flux from the SEAKDB was 2.36 Tg C with an average yield of 12.52 g C m −2 . Both karst presence and flow regimes modified DIC flux and speciation across coastal marine areas. The high resolution of DIC flux estimates will provide useful inputs for describing seasonal C dynamics, and further refines our understanding of C budgets in the Pacific temperate rainforest and the surrounding marine environment. , Plain Language Summary Understanding how carbon moves through ecosystems is critical in a changing climate. Dissolved carbon in aquatic environments plays a critical role in driving large‐scale processes such as ocean acidification, which represents a threat to many marine ecosystems. Despite the importance of understanding and accounting for carbon as it moves through the environment, the transfer of dissolved inorganic carbon (DIC) (such as carbon dioxide) from the terrestrial environment to the marine environment is often overlooked. Streams and rivers transfer carbon from land to ocean and represent a significant source of carbon to the marine environment, especially in areas that have large amounts of freshwater discharge such as Southeast Alaska. In this study, we created a model which generates predictions for how much DIC is entering the marine environment of Southeast Alaska. For each of 2,455 watersheds identified in this region we calculated monthly flux estimates which we grouped into large marine zones. Our overall flux estimate agrees well with previous estimates, but here our model provides more highly resolved spatial and temporal flux values which reveals seasonal and geographic patterns of DIC transfer from rivers to the marine environment. , Key Points Lateral flux of dissolved inorganic carbon (DIC) is not well resolved in time and space in Southeast Alaska We present robust models for DIC flux on a watershed basis that are spatially and temporally explicit Calculated DIC flux from Southeast Alaska watersheds is heavily influenced by streamflow regime and karst presence
@article{harley_riverine_2023,
title = {Riverine {Dissolved} {Inorganic} {Carbon} {Export} {From} the {Southeast} {Alaskan} {Drainage} {Basin} {With} {Implications} for {Coastal} {Ocean} {Processes}},
volume = {128},
issn = {2169-8953, 2169-8961},
url = {https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2023JG007609},
doi = {10.1029/2023JG007609},
abstract = {Abstract
Dissolved inorganic carbon (DIC) represents an important but poorly constrained form of lateral carbon flux to the oceans. With high precipitation rates, large glaciers, and dense temperate rainforest, Southeast Alaska plays a critical role in the transport of carbon to the Gulf of Alaska (GOA). Previous estimates of DIC flux across the Southeast Alaska Drainage Basin (SEAKDB) are poorly constrained in space and time. Our goal was to incorporate recent measurements of DIC concentrations with previous measurements from the U.S. Geological Survey in order to model the spatial and temporal patterns of riverine DIC transport from SEAK to the GOA. We aggregated DIC concentration measurements from 1957 to 2020 and associated measurements of mean daily discharge. We then constructed load estimation models to generate concentration predictions across 24 watersheds. By spatially matching measurements of DIC with SEAKDB watersheds, we extrapolated concentration predictions across 2,455 watersheds encompassing approximately 190,000 km
2
. Models were aggregated according to two factors, the presence of karst and the discharge regime. Finally, monthly flux predictions were generated for each watershed using predicted concentrations and runoff estimates from the Distributed Climate Water Balance Model. Mean annual DIC flux from the SEAKDB was 2.36 Tg C with an average yield of 12.52 g C m
−2
. Both karst presence and flow regimes modified DIC flux and speciation across coastal marine areas. The high resolution of DIC flux estimates will provide useful inputs for describing seasonal C dynamics, and further refines our understanding of C budgets in the Pacific temperate rainforest and the surrounding marine environment.
,
Plain Language Summary
Understanding how carbon moves through ecosystems is critical in a changing climate. Dissolved carbon in aquatic environments plays a critical role in driving large‐scale processes such as ocean acidification, which represents a threat to many marine ecosystems. Despite the importance of understanding and accounting for carbon as it moves through the environment, the transfer of dissolved inorganic carbon (DIC) (such as carbon dioxide) from the terrestrial environment to the marine environment is often overlooked. Streams and rivers transfer carbon from land to ocean and represent a significant source of carbon to the marine environment, especially in areas that have large amounts of freshwater discharge such as Southeast Alaska. In this study, we created a model which generates predictions for how much DIC is entering the marine environment of Southeast Alaska. For each of 2,455 watersheds identified in this region we calculated monthly flux estimates which we grouped into large marine zones. Our overall flux estimate agrees well with previous estimates, but here our model provides more highly resolved spatial and temporal flux values which reveals seasonal and geographic patterns of DIC transfer from rivers to the marine environment.
,
Key Points
Lateral flux of dissolved inorganic carbon (DIC) is not well resolved in time and space in Southeast Alaska
We present robust models for DIC flux on a watershed basis that are spatially and temporally explicit
Calculated DIC flux from Southeast Alaska watersheds is heavily influenced by streamflow regime and karst presence},
language = {en},
number = {10},
urldate = {2024-11-17},
journal = {Journal of Geophysical Research: Biogeosciences},
author = {Harley, John R. and Biles, Frances E. and Brooks, Mariela K. and Fellman, Jason and Hood, Eran and D’Amore, David V.},
month = oct,
year = {2023},
pages = {e2023JG007609},
}
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Previous estimates of DIC flux across the Southeast Alaska Drainage Basin (SEAKDB) are poorly constrained in space and time. Our goal was to incorporate recent measurements of DIC concentrations with previous measurements from the U.S. Geological Survey in order to model the spatial and temporal patterns of riverine DIC transport from SEAK to the GOA. We aggregated DIC concentration measurements from 1957 to 2020 and associated measurements of mean daily discharge. We then constructed load estimation models to generate concentration predictions across 24 watersheds. By spatially matching measurements of DIC with SEAKDB watersheds, we extrapolated concentration predictions across 2,455 watersheds encompassing approximately 190,000 km 2 . Models were aggregated according to two factors, the presence of karst and the discharge regime. Finally, monthly flux predictions were generated for each watershed using predicted concentrations and runoff estimates from the Distributed Climate Water Balance Model. Mean annual DIC flux from the SEAKDB was 2.36 Tg C with an average yield of 12.52 g C m −2 . Both karst presence and flow regimes modified DIC flux and speciation across coastal marine areas. The high resolution of DIC flux estimates will provide useful inputs for describing seasonal C dynamics, and further refines our understanding of C budgets in the Pacific temperate rainforest and the surrounding marine environment. , Plain Language Summary Understanding how carbon moves through ecosystems is critical in a changing climate. Dissolved carbon in aquatic environments plays a critical role in driving large‐scale processes such as ocean acidification, which represents a threat to many marine ecosystems. Despite the importance of understanding and accounting for carbon as it moves through the environment, the transfer of dissolved inorganic carbon (DIC) (such as carbon dioxide) from the terrestrial environment to the marine environment is often overlooked. Streams and rivers transfer carbon from land to ocean and represent a significant source of carbon to the marine environment, especially in areas that have large amounts of freshwater discharge such as Southeast Alaska. In this study, we created a model which generates predictions for how much DIC is entering the marine environment of Southeast Alaska. For each of 2,455 watersheds identified in this region we calculated monthly flux estimates which we grouped into large marine zones. Our overall flux estimate agrees well with previous estimates, but here our model provides more highly resolved spatial and temporal flux values which reveals seasonal and geographic patterns of DIC transfer from rivers to the marine environment. , Key Points Lateral flux of dissolved inorganic carbon (DIC) is not well resolved in time and space in Southeast Alaska We present robust models for DIC flux on a watershed basis that are spatially and temporally explicit Calculated DIC flux from Southeast Alaska watersheds is heavily influenced by streamflow regime and karst presence","language":"en","number":"10","urldate":"2024-11-17","journal":"Journal of Geophysical Research: Biogeosciences","author":[{"propositions":[],"lastnames":["Harley"],"firstnames":["John","R."],"suffixes":[]},{"propositions":[],"lastnames":["Biles"],"firstnames":["Frances","E."],"suffixes":[]},{"propositions":[],"lastnames":["Brooks"],"firstnames":["Mariela","K."],"suffixes":[]},{"propositions":[],"lastnames":["Fellman"],"firstnames":["Jason"],"suffixes":[]},{"propositions":[],"lastnames":["Hood"],"firstnames":["Eran"],"suffixes":[]},{"propositions":[],"lastnames":["D’Amore"],"firstnames":["David","V."],"suffixes":[]}],"month":"October","year":"2023","pages":"e2023JG007609","bibtex":"@article{harley_riverine_2023,\n\ttitle = {Riverine {Dissolved} {Inorganic} {Carbon} {Export} {From} the {Southeast} {Alaskan} {Drainage} {Basin} {With} {Implications} for {Coastal} {Ocean} {Processes}},\n\tvolume = {128},\n\tissn = {2169-8953, 2169-8961},\n\turl = {https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2023JG007609},\n\tdoi = {10.1029/2023JG007609},\n\tabstract = {Abstract\n \n Dissolved inorganic carbon (DIC) represents an important but poorly constrained form of lateral carbon flux to the oceans. With high precipitation rates, large glaciers, and dense temperate rainforest, Southeast Alaska plays a critical role in the transport of carbon to the Gulf of Alaska (GOA). Previous estimates of DIC flux across the Southeast Alaska Drainage Basin (SEAKDB) are poorly constrained in space and time. Our goal was to incorporate recent measurements of DIC concentrations with previous measurements from the U.S. Geological Survey in order to model the spatial and temporal patterns of riverine DIC transport from SEAK to the GOA. We aggregated DIC concentration measurements from 1957 to 2020 and associated measurements of mean daily discharge. We then constructed load estimation models to generate concentration predictions across 24 watersheds. By spatially matching measurements of DIC with SEAKDB watersheds, we extrapolated concentration predictions across 2,455 watersheds encompassing approximately 190,000 km\n 2\n . Models were aggregated according to two factors, the presence of karst and the discharge regime. Finally, monthly flux predictions were generated for each watershed using predicted concentrations and runoff estimates from the Distributed Climate Water Balance Model. Mean annual DIC flux from the SEAKDB was 2.36 Tg C with an average yield of 12.52 g C m\n −2\n . Both karst presence and flow regimes modified DIC flux and speciation across coastal marine areas. The high resolution of DIC flux estimates will provide useful inputs for describing seasonal C dynamics, and further refines our understanding of C budgets in the Pacific temperate rainforest and the surrounding marine environment.\n \n , \n Plain Language Summary\n Understanding how carbon moves through ecosystems is critical in a changing climate. Dissolved carbon in aquatic environments plays a critical role in driving large‐scale processes such as ocean acidification, which represents a threat to many marine ecosystems. Despite the importance of understanding and accounting for carbon as it moves through the environment, the transfer of dissolved inorganic carbon (DIC) (such as carbon dioxide) from the terrestrial environment to the marine environment is often overlooked. Streams and rivers transfer carbon from land to ocean and represent a significant source of carbon to the marine environment, especially in areas that have large amounts of freshwater discharge such as Southeast Alaska. In this study, we created a model which generates predictions for how much DIC is entering the marine environment of Southeast Alaska. For each of 2,455 watersheds identified in this region we calculated monthly flux estimates which we grouped into large marine zones. Our overall flux estimate agrees well with previous estimates, but here our model provides more highly resolved spatial and temporal flux values which reveals seasonal and geographic patterns of DIC transfer from rivers to the marine environment.\n , \n Key Points\n \n \n \n Lateral flux of dissolved inorganic carbon (DIC) is not well resolved in time and space in Southeast Alaska\n \n \n We present robust models for DIC flux on a watershed basis that are spatially and temporally explicit\n \n \n Calculated DIC flux from Southeast Alaska watersheds is heavily influenced by streamflow regime and karst presence},\n\tlanguage = {en},\n\tnumber = {10},\n\turldate = {2024-11-17},\n\tjournal = {Journal of Geophysical Research: Biogeosciences},\n\tauthor = {Harley, John R. and Biles, Frances E. and Brooks, Mariela K. and Fellman, Jason and Hood, Eran and D’Amore, David V.},\n\tmonth = oct,\n\tyear = {2023},\n\tpages = {e2023JG007609},\n}\n\n\n\n\n\n\n\n","author_short":["Harley, J. R.","Biles, F. E.","Brooks, M. K.","Fellman, J.","Hood, E.","D’Amore, D. V."],"key":"harley_riverine_2023","id":"harley_riverine_2023","bibbaseid":"harley-biles-brooks-fellman-hood-damore-riverinedissolvedinorganiccarbonexportfromthesoutheastalaskandrainagebasinwithimplicationsforcoastaloceanprocesses-2023","role":"author","urls":{"Paper":"https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2023JG007609"},"metadata":{"authorlinks":{}}},"bibtype":"article","biburl":"https://bibbase.org/zotero/tereno","dataSources":["cq3J5xX6zmBvc2TQC"],"keywords":[],"search_terms":["riverine","dissolved","inorganic","carbon","export","southeast","alaskan","drainage","basin","implications","coastal","ocean","processes","harley","biles","brooks","fellman","hood","d’amore"],"title":"Riverine Dissolved Inorganic Carbon Export From the Southeast Alaskan Drainage Basin With Implications for Coastal Ocean Processes","year":2023}