 The Mississippi River Delta Plain is a large river-dominated wetland, estuarine system that delivers a total of 6.7 TGC year 1, 1 TG equals 1012 G, of dissolved organic carbon, DOC, into the estuary and the northern gulf of Mexico. This amount of DOC is equivalent to approximately 1% of the annual global oceanic uptake of atmospheric CO2. Extreme flooding events in 2019 and hurricanes in 2019 and 2021 contributed to the delivery of DOC from the river and wetlands into the estuary and the NGOM. Storms and floods can be important sources of DOC that facilitate transport of upstream carbon as well as transformation of carbon in the wetlands, through the conversion of vegetated wetlands to open water. This article was authored by Bingqing Liu, Yuriko J. DSA, Francesca Messina, and others.