  Jupiter's tropospheric ammonia (NH\textsubscript{3}) abundance is studied
using spatially-resolved 5-\textmu m observations from CRIRES, a high
resolution spectrometer at the European Southern Observatory's Very Large
Telescope. The high resolving power (R=96,000) allows the line shapes of three
NH\textsubscript{3} absorption features to be resolved. We find that within the
1--4 bar pressure range, the NH\textsubscript{3} abundance decreases with
altitude. The instrument slit was aligned north-south along Jupiter's central
meridian, allowing us to search for latitudinal variability. There is
considerable uncertainty in the large-scale latitudinal variability, as the
increase in cloud opacity in zones compared to belts can mask absorption
features. However, we do find evidence for a strong NH\textsubscript{3}
enhancement at 4--6$^{\circ}$N, consistent with a localised `ammonia plume' on
the southern edge of Jupiter's North Equatorial Belt.
