1H NMR spectra of whole porewater dissolved organic matter (DOM) samples from California margin sediments sampled in 2020 onboard the R/V Sikuliaq

1H NMR spectra of whole dissolved organic matter (DOM) samples are reported for StaD and StaK, located in the upper slope offshore central California. Sediment and porewater sampling were done in Dec 2020 onboard the R/V Sikuliaq. Sediment samples were retrieved using multi-cores and gravity cores operated by the Oregon State University Marine Rock and Sediment Sampling Group. Porewater samples were extracted from the sediment within hours of core retrieval in a refrigerated van. Rhizon samplers were used to collect porewater from multicores, whereas centrifugation was used for porewater collection from gravity cores. Upon collection, porewater samples were immediately poisoned with mercuric chloride and flame-sealed in glass ampules under a stream of ultra-high-purity nitrogen gas and refrigerated until analysis. Reported here are 1H NMR spectra of whole DOM samples, UV-irradiated deionized water blanks collected on the ship, and UV-irradiated deionized water pulled through Rhizon samplers (all 0.2-micron filtered).