Impact of Marine Heatwaves on Air-Sea CO2 Flux Along the US East Coast

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Author(s)Edwing, Kelsea
Author(s)Wu, Zelun
Author(s)Lu, Wenfang
Author(s)Li, Xinyu
Author(s)Cai, Wei-Jun
Author(s)Yan, Xiao-Hai
Date Accessioned2024-03-01T17:49:40Z
Date Available2024-03-01T17:49:40Z
Publication Date2024-01-02
DescriptionThis article was originally published in Geophysical Research Letters. The version of record is available at: https://doi.org/10.1029/2023GL105363. © 2024. The Authors. This article was featured in a UDaily article on 2/29/2024 at: https://www.udel.edu/udaily/2024/february/climate-change-indian-ocean-marine-heatwaves-mid-south-atlantic-bight-warming/
AbstractMarine heatwaves (MHWs) are extremely warm ocean temperature events that significantly affect marine environments, but their effects on the coastal carbonate system are still uncertain. In this study, we systematically quantify MHWs' impacts on air-sea carbon dioxide (CO2) flux anomalies (FCO2′) in the Mid-Atlantic Bight (MAB) and South Atlantic Bight (SAB) from 1992 to 2020. During the longest MHW in both regions, oceanic CO2 uptake capabilities substantially decreased, primarily due to significant increases in the seawater partial pressure of CO2 (pCO2sea). For all cases, MHWs played a more significant role in driving pCO2sea changes in the MAB than the SAB, where non-thermal drivers dominated pCO2sea variability. In the MAB, weakened wind speeds related to wintertime atmospheric perturbations increase ocean temperatures and pCO2sea, further reducing CO2 uptake during winter MHWs. This work is the first to connect extreme temperatures to coastal air-sea CO2 fluxes. The reduction in CO2 absorption noted during MHWs in this study has important implications for coastal regions to act as continued sinks for excess CO2 emissions in the atmosphere. Key Points - Marine heatwaves (MHWs) primarily generated positive sea surface pCO2 (pCO2sea) anomalies in the Mid-Atlantic Bight (MAB) and South Atlantic Bight (SAB) but had a larger impact on air-sea CO2 flux anomalies in the MAB - Reduced wind speeds amplified MHW contributions during CO2 sink months and counteracted them during CO2 source months - In the MAB, wintertime atmospheric perturbations related to zonal shifts in the jet stream produce slower wind speeds which aid in generating air-sea heat flux type MHW events that ultimately reduce oceanic CO2 uptake Plain Language Summary The transfer of carbon dioxide (CO2) between the atmosphere and ocean is sensitive to sea surface temperature (SST) changes because warmer SSTs increase the sea surface partial pressure of CO2 and reduce the ocean's ability to absorb CO2 from the atmosphere. It is, therefore, conceivable that marine heatwaves (MHWs), which are extremely warm ocean temperature events, could modify how carbon moves between the ocean and the atmosphere. This study provides the first attempt to evaluate the impacts of MHWs on the air-sea CO2 flux (FCO2) anomalies along the US East Coast, encompassing the Mid-Atlantic Bight (MAB) and South Atlantic Bight (SAB) during 1992–2020. Both regions experienced reduced CO2 absorption in response to the longest MHWs in each region. These extreme temperatures had a larger impact on CO2 absorption in the MAB compared to the SAB, where non-temperature factors were more influential. The coastal ocean plays an important role in helping to mitigate human-induced climate change by absorbing excess CO2 from the atmosphere. As such, the demonstrated reduced absorption of the ocean associated with MHWs in this study, which might also apply to other coastal locations, has vital implications for the efficiency of the ocean in offsetting global warming impacts.
SponsorZelun Wu acknowledges support from the National Natural Science Foundation of China (91858202) and the Ph.D. Fellowship of the State Key Laboratory of Marine and Environment Science at Xiamen University. Kelsea Edwing and Xiao-Hai Yan acknowledge support from the National Science Foundation (NSF-IIS-2123264), and the National Aeronautics and Space Administration (NASA-80NSSC20M0220). Wei-Jun Cai aknowledges support from the NOAA's Ocean Acidification Program (OAP) on data collection and synthesis. Kelsea Edwing analyzed data and wrote the paper. Zelun Wu conceived the idea, helped with the discussion, and revised the manuscript. Dr. Xinyu Li, Dr. Wenfang Lu, Dr. Wei-Jun Cai, and Dr. Xiao-Hai Yan revised the manuscript. All authors contributed to the discussion and improvement of the work. We thank NOAA, the Remote Sensing System, and the carbonate community (SOCAT) for sharing their data.
CitationEdwing, K., Wu, Z., Lu, W., Li, X., Cai, W.-J., & Yan, X.-H. (2024). Impact of marine heatwaves on air-sea CO2 flux along the US East Coast. Geophysical Research Letters, 51, e2023GL105363. https://doi.org/10.1029/2023GL105363
ISSN1944-8007
URLhttps://udspace.udel.edu/handle/19716/34087
Languageen_US
PublisherGeophysical Research Letters
dc.rightsAttribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
Keywordsmarine heatwaves
Keywordsair-sea CO2 flux
KeywordsUS East Coast
Keywordsextreme events
Keywordsclimate action
TitleImpact of Marine Heatwaves on Air-Sea CO2 Flux Along the US East Coast
TypeArticle
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