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Biogeochemistry of organic matter and associated elements along the river-estuary-ocean continuum
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Chemodiversity of sediment porewater DOM in two contrasting sediment cores within the Chesapeake Bay, USA
Wednesday 9th @ 0950-1010, Conference Hall
Michael Gonsior* , University of Maryland Center for Environmental Science, Chesapeake Biological Laboratory
Leanne Powers, University of Maryland Center for Environmental Science, Chesapeake Biological Laboratory
Laura Lapham, University of Maryland Center for Environmental Science, Chesapeake Biological Laboratory
Sairah Malkin, University of Maryland Center for Environmental Science, Horn Point Laboratory
Presenter Email: gonsior@umces.edu |
| Chesapeake Bay sediment cores were collected at an almost freshwater site in the upper Bay as well as in the middle of the Bay within the deep channel and pore water was extracted at various depth up to 65 cm depth. Pore water DOM was analyzed by ultrahigh resolution mass spectrometry, excitation emission matrix fluorescence, and DOC and TDN was measured. Results showed distinct differences in the chemodiversity of porewater DOM at these two contrasting sites and revealed that the porewater DOM reflected the terrestrially-derived origin of organic matter in the upper bay whereas the mid-Bay samples revealed an origin more in agreement with an algal source. Furthermore, the hydrosulfurization was tracked at the mid-Bay site throughout the sediment core and revealed an increase in chemodiversity of sulfurized porewater DOM with depth. |
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