Net source or sink? Direct air-sea flux measurements of greenhouse gases and volatile organic carbon on the coast

摘要: The coastal seas, connecting land with the open ocean, are regions of intensive trace gas cycling. Influenced by riverine input and other terrestrial run offs, coastal seas can be significant sources of greenhouse gases (GHGs) to the atmosphere. Many gaseous volatile organic carbon (VOC) compounds are emitted from terrestrial biogenic and anthropogenic sources into the air, and these gases may be absorbed by the coastal seas during periods of offshore wind flow. Due to the heterogeneity of the coastal environment, the multitude of emission sources, and the large variability in physical forcing, the directions (let alone magnitudes) of the air-sea fluxes of many trace gases are poorly known. Here we describe a year-long dataset of air-sea methane and carbon dioxide fluxes, as well as a month-long dataset of VOC fluxes. These fluxes were measured directly with the eddy covariance technique at the coastal …