NOx Shipping lane

Ship traffic density map showing the main shipping lane from the North Sea into the Elbe river close to the measurement site on a radar tower on the island Neuwerk (red dot). Wind measurements are available on Neuwerk as well as the neighboring island Scharhörn (green dots). (b) Effective horizontal light paths in UV (purple line) and visible spectral ranges (green line) for the five azimuthal viewing directions of the MAX-DOAS instrument