Seasonal response of air–water CO2 exchange along the land–ocean aquatic continuum of the northeast North American coast.

[摘要] This regional study quantifies the CO₂ exchange at the air–waterinterface along the land–ocean aquatic continuum (LOAC) of the northeastNorth American coast, from streams to the shelf break. Our analysisexplicitly accounts for spatial and seasonal variability in the CO₂fluxes. The yearly integrated budget reveals the gradual change in theintensity of the CO₂ exchange at the air–water interface, from a strongsource towards the atmosphere in streams and rivers (3.0 ±0.5 TgC yr⁻¹) and estuaries (0.8 ± 0.5 TgC yr⁻¹) to a netsink in continental shelf waters (−1.7 ± 0.3 TgC yr⁻¹).Significant differences in flux intensity and their seasonal response toclimate variations is observed between the North and South sections of thestudy area, both in rivers and coastal waters. Ice cover, snowmelt, andintensity of the carbon removal efficiency through the estuarine filter areidentified as important control factors of the observed spatiotemporalvariability in CO₂ exchange along the LOAC.

[学科分类] 地球化学与岩石