Southern Annular Mode variability

E97862

atmospheric circulation pattern climate variability mode

Southern Annular Mode variability refers to fluctuations in the dominant pattern of atmospheric pressure and westerly wind strength encircling Antarctica, which strongly influence Southern Hemisphere climate and ocean circulation.

Jump to: Surface forms Statements Referenced by

Observed surface forms (4)

Surface form	Occurrences
Antarctic Oscillation variability	1
Southern Annular Mode	1
Southern Annular Mode index	1
Southern Hemisphere Annular Mode	1

Statements (47)

Predicate	Object
instanceOf	atmospheric circulation pattern ⓘ climate variability mode ⓘ
affects	Antarctic climate ⓘ Southern Hemisphere climate ⓘ Southern Hemisphere jet stream position ⓘ Southern Hemisphere storm tracks ⓘ Southern Hemisphere temperature patterns ⓘ Southern Hemisphere westerly winds ⓘ Southern Ocean circulation ⓘ Southern Ocean upwelling ⓘ midlatitude Southern Hemisphere precipitation ⓘ sea ice extent around Antarctica ⓘ
alsoKnownAs	Southern Annular Mode variability ⓘ surface form: Antarctic Oscillation variability SAM variability ⓘ
associatedWith	equatorward shift of storm tracks in negative phase ⓘ higher pressure over Antarctica in negative phase ⓘ lower pressure over Antarctica in positive phase ⓘ poleward shift of storm tracks in positive phase ⓘ
characterizedBy	changes in strength of Southern Hemisphere westerly winds ⓘ fluctuations in zonal mean sea level pressure around Antarctica ⓘ shifts in latitude of Southern Hemisphere westerly wind belt ⓘ
drivenBy	internal atmospheric dynamics ⓘ
hasComponent	negative phase of Southern Annular Mode ⓘ positive phase of Southern Annular Mode ⓘ
hasImpactOn	Antarctic ice sheet surface mass balance ⓘ Southern Hemisphere fire weather conditions ⓘ Southern Hemisphere wave climate ⓘ Southern Ocean carbon uptake ⓘ Southern Ocean heat uptake ⓘ
influencedBy	El Niño–Southern Oscillation ⓘ greenhouse gas forcing ⓘ stratospheric ozone depletion ⓘ tropical sea surface temperature anomalies ⓘ
measuredBy	Southern Annular Mode variability self-linksurface differs ⓘ surface form: Southern Annular Mode index principal component of leading EOF of zonal mean sea level pressure ⓘ
modulates	Southern Hemisphere blocking frequency ⓘ exchange of heat between atmosphere and Southern Ocean ⓘ exchange of momentum between atmosphere and Southern Ocean ⓘ
occursIn	Southern Hemisphere ⓘ surface form: Southern Hemisphere extratropics
relatedTo	Northern Annular Mode variability ⓘ Southern Annular Mode variability self-linksurface differs ⓘ surface form: Southern Hemisphere Annular Mode
studiedIn	atmospheric science ⓘ climate change research ⓘ ocean–atmosphere interaction research ⓘ
timescale	decadal timescale ⓘ interannual timescale ⓘ subseasonal timescale ⓘ

Referenced by (5)

Full triples — surface form annotated when it differs from this entity's canonical label.

Antarctic Circumpolar Current → affectedBy → Southern Annular Mode variability ⓘ

Brazil–Malvinas Confluence → affectedBy → Southern Annular Mode variability ⓘ

this entity surface form: Southern Annular Mode

Southern Annular Mode variability → alsoKnownAs → Southern Annular Mode variability ⓘ

this entity surface form: Antarctic Oscillation variability

Southern Annular Mode variability → measuredBy → Southern Annular Mode variability self-linksurface differs ⓘ

this entity surface form: Southern Annular Mode index

Southern Annular Mode variability → relatedTo → Southern Annular Mode variability self-linksurface differs ⓘ

this entity surface form: Southern Hemisphere Annular Mode