Deutsch
 
Datenschutzhinweis Impressum
  DetailsucheBrowse

Datensatz

DATENSATZ AKTIONENEXPORT
  Impacts of a midlatitude oceanic frontal zone on the southern baroclinic annular mode

Nakayama, M., Nakamura, H., Ogawa, F. (2023): Impacts of a midlatitude oceanic frontal zone on the southern baroclinic annular mode, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2328

Item is

Externe Referenzen

einblenden:

Urheber

einblenden:
ausblenden:
 Urheber:
Nakayama, Morio1, Autor
Nakamura, Hisashi1, Autor
Ogawa, Fumiaki1, Autor
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

Inhalt

einblenden:
ausblenden:
Schlagwörter: -
 Zusammenfassung: The baroclinic annular mode (BAM) is the leading mode of variability in extratropical atmospheric eddy activity representing its hemispheric-scale pulsing. Focusing mainly on sub-weekly disturbances, this study shows impacts of a midlatitude oceanic frontal zone on the BAM signature and its dynamics through “aqua-planet” atmospheric general circulation model experiments with zonally uniform SST profiles prescribed. Though idealized, one experiment with a distinct frontal SST gradient as observed along Antarctic Polar Frontal Zone in the South Indian Ocean, reasonably reproduces BAM signature in the Southern Hemisphere, as captured in atmospheric reanalysis data. In the positive phase of the BAM characterized by enhanced activity of sub-weekly disturbances, they tend to exhibit more distinct baroclinic structures in the lower troposphere and more meridionally-elongated structures in both the upper and lower troposphere. These structural modulations favor more efficient baroclinic development of the disturbances via their poleward heat transport and downstream development, featuring the positive phase of the BAM. Comparison with another sensitivity experiment where the frontal SST gradient is artificially relaxed suggests that, while the BAM is essentially a manifestation of atmospheric internal dynamics, BAM-associated variability in lower-tropospheric poleward heat flux and upper-tropospheric kinetic energy of the disturbances are substantially amplified and the BAM-associated modulation in the baroclinic structure becomes more significant, both by an oceanic front, due to more organized and coherent baroclinic wave packets.

Details

einblenden:
ausblenden:
Sprache(n): eng - Englisch
 Datum: 2023
 Publikationsstatus: Final veröffentlicht
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.57757/IUGG23-2328
 Art des Abschluß: -

Veranstaltung

einblenden:
ausblenden:
Titel: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Veranstaltungsort: Berlin
Start-/Enddatum: 2023-07-11 - 2023-07-20

Entscheidung

einblenden:

Projektinformation

einblenden:

Quelle 1

einblenden:
ausblenden:
Titel: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Genre der Quelle: Konferenzband
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Potsdam : GFZ German Research Centre for Geosciences
Seiten: - Band / Heft: - Artikelnummer: - Start- / Endseite: - Identifikator: -