Understanding processes driving air-sea gas transfer and being able to model both its mean and variability are critical for studies of climate and carbon cycle. The air-sea gas transfer velocity (K (660)) is almost universally parameterized as a function of wind speed in large scale models-an oversimplification that buries the mechanisms controlling K (660) and neglects much natural variability. Sea state has long been speculated to affect gas transfer, but consistent relationships from in …