We continue our AMIGGO campaign, where we are observing spatial gradients in greenhouse gases around Alaska.   In earlier studies, we used two sites to determine upwind/downwind changes in CO2 and CH4 and infer intervening fluxes.   This year, we are using three sites to measure these gases in a network ringing the Tanana River basin.   Niki was observing in Nenana, we had an automated instrument in Fairbanks, and I was on a gravel bar at the Salcha River, where it was a beautiful day.   Stay tuned for more AMIGGO reports.