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Abstract
The BlueFlux field campaign, supported by NASA’s Carbon Monitoring System, will develop prototype blue carbon products to inform coastal carbon management. While blue carbon has been suggested as a nature-based climate solution (NBS) to remove carbon dioxide (CO2) from the atmosphere, these ecosystems also release additional greenhouse gases (GHGs) such as methane (CH4) and are sensitive to disturbances including hurricanes and sea-level rise. To understand blue carbon as an NBS, BlueFlux is conducting multi-scale measurements of CO2 and CH4 fluxes across coastal landscapes, combined with long-term carbon burial, in Southern Florida using chambers, flux towers, and aircraft combined with remote-sensing observations for regional upscaling. During the first deployment in April 2022, CO2 uptake and CH4 emissions across the Everglades National Park averaged −4.9 ± 4.7 μmol CO2 m−2 s−1 and 19.8 ± 41.1 nmol CH4 m−2 s−1, respectively. When scaled to the region, mangrove CH4 emissions offset the mangrove CO2 uptake by about 5% (assuming a 100 year CH4 global warming potential of 28), leading to total net uptake of 31.8 Tg CO2-eq y−1. Subsequent field campaigns will measure diurnal and seasonal changes in emissions and integrate measurements of long-term carbon burial to develop comprehensive annual and long-term GHG budgets to inform blue carbon as a climate solution.
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1 NASA Goddard Space Flight Center, Earth Sciences Division , Greenbelt, MD 20771, United States of America
2 Yale School of the Environment, Yale University , New Haven, CT, United States of America
3 Earth Lab, Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder , Boulder, CO 80303, United States of America
4 Integrated Coastal Programs, East Carolina University , Wanchese, NC, United States of America
5 Wageningen University & Research, Laboratory of Geo-Information Science and Remote Sensing , 6708PB Wageningen, The Netherlands
6 NASA Goddard Space Flight Center, Earth Sciences Division , Greenbelt, MD 20771, United States of America; Oak Ridge Associated Universities , Oak Ridge, TN 37830, United States of America
7 Department of Geology and Environmental Science, University of Pittsburgh , Pittsburgh, PA 15260, United States of America
8 Science Systems and Applications Inc. , Lanham, MD, United States of America
9 Yale School of the Environment, Yale University , New Haven, CT, United States of America; Yale Institute for Biospheric Studies, Yale University , New Haven, CT, United States of America; Yale Institute for Biospheric Studies, Yale University , New Haven, CT 06520, United States of America; Centre for Coastal Biogeochemistry, Faculty of Science and Engineering, Southern Cross University , Lismore, NSW 2480, Australia
10 Earth System Science Interdisciplinary Center, University of Maryland , College Park, MD 20742, United States of America