Molecular composition of dissolved organic matter in the Mediterranean Sea
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AuthorsMartínez-Pérez, A.M. (Alba María); Osterholz, H. (Helena); Nieto-Cid, M. (Mar); Álvarez, M. (Marta); Dittmar, T. (Thorsten); Álvarez-Salgado, X. A. (Xosé Antón)
The molecular composition of marine dissolved organic matter (DOM) is still poorly understood, particularly in the Mediterranean Sea. In this work, DOM from the open Mediterranean Sea and the adjacent Northeast Atlantic Ocean was isolated by solid-phase extraction (SPE-DOM) and molecularly characterized using Fourier-transform ion cyclotron resonance mass spectrometry. We assessed the gradual reworking of the SPE-DOM transported by the shalloww overturning circulation of the Mediterranean Sea by following the increase in molecular weight (+20 Da), oxigenation (+5%), degradation index (Ideg +22%), and the proportional decrease of unsaturated aliphatic compounds (+34%) along the Levantine Intermediate Water. This reworked SPE-DOM that leaves the Mediterranean Sea through the Strait of Gibraltar strongly contrasts with the fresh material transported by the inflow of Atlantic water (Ideg -25%). In the deep eastern and western overturning cells, the molecular composition of the deep waters ...
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