To trace the sources of those pollutants, Xu and his colleagues correlated meteorological measurements with chemical
compositions of air parcels sampled at 16 locations across the region.
The lines represent the
paths of air parcels, and their colours indicate how much an air parcel rotates around its own axis.
However, the mean
age of an air parcel may be sensitive to small fractions of the air that have resided for long times in the upper atmosphere.
We don't need another explanation — especially one where the statistical
mechanics of air parcels are governed by gravity and are therefore invariant.
where is the gravitational acceleration, is the net radiative energy input to the atmosphere, is the ocean heat uptake, is the north - south wind, and is the
energy of an air parcel (specifically the moist static energy).