NADW Photodegradation FTICR-MS ...

• Main Authors: Stubbins, Aron, Dittmar, Thorsten
• Format: Dataset
• Language: English
• Published: PANGAEA 2015
• Subjects: NADW; North Atlantic Deep Water; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.846492; https://doi.pangaea.de/10.1594/PANGAEA.846492

Duplicate, filtered samples of North Atlantic Deep Water (NADW) were irradiated for 28 days in a solar simulator. Duplicate dark controls were placed alongside the irradiated samples. After 28 days, samples were extensively photo-degraded based upon colored dissolved organic matter (CDOM) photo-bleaching (> 95%). Samples were solid phase extracted using PPL resin to isolate, concentrate and desalt the dissolved organic matter (DOM) in the samples. Ultrahigh resolution electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS) enabled 3024 molecular formulas to be identified in the dark control. Photo-degradation decreased molecular diversity, with 2402 formulas assigned post-irradiation. Molecular formulas were classified based upon their photo-lability as 1) photo-resistant; 2) photo-labile; and, 3) photo-produced. Photo-resistant DOM made up 73% of all formulas and was dominated by highly unsaturated molecular signatures consistent with carboxylic-rich alicyclic ... : Data product presents assigned formulas for electrospray ionisation Fourier transform ion cyclotron resonance mass spectra for North Atlantic Deep Water dissolved organic matter as isolated by PPL solid phase extraction categorized based upon it photo-lability. For full details see the publication. ...