Assertion: acetaldehyde | /r/HasProperty | reported by mopper
Facets:
value: previously
type: TEMPORAL
Source sentences:
text: [ 2004 ] published methanol and acetone depth profiles noting higher surface concentrations than those observed at depth (150–200 m), and acetaldehyde below the mixed layer (as deep as 2 km) has previously been reported by Mopper and Kieber [ 1991 ].