SWEET Ontology
type: Ontology
version info: 2.3
imports: reprMathFunction.owl
imports: phenAtmo.owl
imports: realmLandOrographic.owl
imports: procPhysical.owl
imports: phenFluidInstability.owl
imports: phenAtmoWindMesoscale.owl
imports: relaSci.owl
imports: rela.owl

ColdFront
type: Class
subclass of: Front
subclass of: Restriction
  on property: hasPhenomena
  all values from: Cooling
comment: Any nonoccluded front, or portion thereof, that moves so that the colder air replaces the warmer air; that is, the leading edge of a relatively cold air mass.

Dryline
type: Class
subclass of: Front
comment: A low-level mesoscale boundary or transition zone hundreds of kilometers in length and up to tens of kilometers in width separating dry air from moist air.

Front
type: Class
subclass of: MeteorologicalPhenomena
subclass of: Discontinuity
comment: In meteorology, generally, the interface or transition zone between two air masses of different density

MediterraneanFront
type: Class
subclass of: Front
comment: A front that forms in the low pressure zone that covers the Mediterranean between the cold air over Europe and the warm air over the Sahara.

MeiyuFront
type: Class
subclass of: Front
comment: (Also called baiu front). A quasi-persistent, nearly stationary, east?west-oriented weak baroclinic zone in the lower troposphere that typically stretches from the east China coast, across Taiwan, and eastward into the Pacific, south of Japan. The term ?mei-yu? is the Chinese expression for ?plum rains.? The mei-yu front generally occurs from mid- to late spring through early to midsummer. This low-level baroclinic zone typically lies beneath a confluent jet entrance region aloft situated downstream of the Tibetan Plateau. The mei-yu/baiu front is very significant in the weather and climate of southeast Asia as it serves as the focus for persistent heavy convective rainfall associated with mesoscale convective complexes (MCCs) or mesoscale convective systems (MCSs) that propagate eastward along the baroclinic zone. The moisture source is typically the South China Sea and sometimes the Bay of Bengal. The usual lifting mechanism is low-level warm-air advection in association with a low-level jet on the equatorward flank of the baroclinic zone. Deep ascent and resulting organized MCCs/MCSs are especially favored when the low-level warm-air advection is situated beneath the favorable equatorward jet entrance region aloft.

FrontalLifting
type: Class
subclass of: Lifting
comment: The forced ascent of the warmer, less dense air at and near a front, occurring whenever the relative velocities of the two air masses are such that they converge at the front.

KataFront
type: Class
subclass of: Front
comment: A front (usually a cold front) at which the warm air descends the frontal surface (except, presumably, in the lowest layers).

KatabaticFront
type: Class
subclass of: Front
comment: Frontal surface above which air is descending.

OccludedFront
type: Class
subclass of: Front
comment: A front that forms as a cyclone moves deeper into colder air.

OutflowBoundary
type: Class
subclass of: Front
comment: A surface boundary formed by the horizontal spreading of thunderstorm-cooled air.

Seclusion
type: Class
subclass of: Front
comment: A special (and rare) case of the process of occlusion, where the point at which the cold front first overtakes the warm front (or quasi-stationary front) is at some distance from the apex of the wave cyclone.

Warm Front
type: Class
subclass of: Front
subclass of: Restriction
  on property: hasPhenomena
  all values from: Heating
disjoint with: ColdFront

WarmSector
type: Class
subclass of: FrontRegion
comment: That area, within the circulation of a wave cyclone, where the warm air is found. Traditionally, it lies between the cold front and warm front of the storm; in the typical case, the warm sector continually diminishes in size and ultimately disappears (at the surface) as the result of occlusion.

SeaBreezeFront
type: Class
subclass of: Front
subclass of: Restriction
  on property: hasPhenomena
  all values from: SeaBreeze
comment: The horizontal discontinuity in temperature and humidity that marks the leading edge of the intrusion of cooler, more moist marine air associated with a sea breeze.

FalseWarmSector
type: Class
subclass of: MeteorologicalPhenomena
comment: The sector, in a horizontal plane, between the occluded front and a secondary cold-front of an occluded cyclone.

TriplePoint
type: Class
subclass of: MeteorologicalPhenomena
comment: A junction point within the tropics of three distinct air masses, considered to be an ideal point of origin for a tropical cyclone.

MoistTongue
type: Class
subclass of: MeteorologicalPhenomena
comment: An extension or protrusion of moist air into a region of lower moisture content. Cloudiness and precipitation are closely related to moist tongues.

Microfront
type: Class
subclass of: Front
comment: A sharp horizontal temperature contrast of a few degrees Celsius within a width of tens of centimeters to a few meters along the trailing edge of a thermal plume in the surface layer of the atmospheric boundary layer.