Dongmei Feng (Univ Cincinatti, USA); Craig Brinkerhoff (Yale, USA); Minhui Li (Yale, USA)

Streams and rivers are important to the exchange of all 3 greenhouse gases. Early scaling estimates noted higher fluxes in wetter regions. More recently, it was demonstrated that a greater percentage of terrestrial CO2 is stripped in regions with greater water throughput. The mechanisms that drive stream and river responses to hydrologic variability is, however, complex. Regional emissions are calculated using estimates of the concentration gradient, gas transfer velocity, and surface area and all 3 of these variables vary with discharge. Here we will present the knowledge base of hydrologic drivers of GHG evasion across scales. We will also discuss how this knowledge base might be incorporated into scaling, and how the SWOT mission might contribute to future advancements.