Figure (bottom panels) shows the coordination number between the oxygen atoms on the nitrate and the hydrogen atoms of water (CN On-Hw (R)), defined as the volume integral of the corresponding RDF up to a radius R. The enhanced ordering of the solvation shell of NO - 3 on ice for the NO - 3 /H + results in a slightly increased average number of accepted hydrogen bonds per oxygen atom from 1.51±0.092 to 1.57±0.096 (Figure ). In turn, the disruption in the solvation shell of NO - 3 on ice for the NO - 3 /NH + 4 results in a decrease of the average number of accepted hydrogen bonds per oxygen atom from 1.51±0.14 in solution to 1.45±0.12 NO - 3 /NH 3 on ice to 1.35±0.13 NO - 3 /NH + 4 on ice (Figure ). interface paired with ammonium/ammonia. For the first three systems, there are two dis-tinct water-dense areas per oxygen of the nitrate due to the fluctuations in the location of water throughout the trajectory. However for Figure ) there are only four or five distinct water-dense areas. Looking further into this, the gap in water density is due to the presence of ammonium/ammonia as for both systems this molecule resides within 5 Å of NO - 3 . Additionally, since the ammonium nitrate complex floats at the surface of the QLL (see Fig. ), the water distribution is on one side of the plane of the nitrate anion.