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Antarctica ice-mass variations on interannual timescale: Coastal Dipole and propagating transports

Li, Zhen ; Chao, Benjamin F. ; Wang, H.S. ; Zhang, Z.Z.

Earth and planetary science letters, 2022-10, Vol.595, p.117789, Article 117789 [Periódico revisado por pares]

Elsevier B.V

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  • Título:
    Antarctica ice-mass variations on interannual timescale: Coastal Dipole and propagating transports
  • Autor: Li, Zhen ; Chao, Benjamin F. ; Wang, H.S. ; Zhang, Z.Z.
  • Assuntos: 2-year Westward Propagation ; 4.7-year Eastward Propagation ; Antarctica Coastal Dipole ; Antarctica ice-mass interannual variations ; GRACE
  • É parte de: Earth and planetary science letters, 2022-10, Vol.595, p.117789, Article 117789
  • Descrição: The target is the non-secular, non-seasonal, interannual ice-mass redistribution over the Antarctica continent, as observed by the satellite mission GRACE (Gravity Recovery and Climate Experiment) for the period from 2002 to 2016. We employ the empirical orthogonal function (EOF) and complex EOF (CEOF) methods on the GRACE monthly time-variable gravity in the form of the mascon data. We find three separate phenomena on different timescales that are hitherto unreported: (i) EOF Mode 1 represents an interannual standing “seesaw” pattern largely concentrates along the coast, which we refer to as the Antarctica Coastal Dipole (ACD), with turnarounds coincident with ENSO events, relative to precipitation anomalies, whereas Mode 2-3 both correlate with the Antarctica Oscillation (AAO); (ii) the leading CEOF Mode shows two different propagating waves, one is the Eastward Propagation (EP) with the periodicity of ∼4.7 years most evident in the East Antarctica, may be induced by the Antarctica Circumpolar Wave; (iii) another is a Westward Propagation (WP) with ∼2 years periodicity in the West Antarctica that mainly travels from the Ronnie Ice Shelf to the Ross Ice Shelf, may relate to AAO. •EOF and CEOF solve for interannual Antarctica ice-mass variations.•Leading EOF Mode is an Antarctica Coastal Dipole influenced by ENSO events.•EOF Modes 2-3 correlate with Antarctic Oscillation.•CEOF shows a 4.7-year Eastward Propagation and a 2-year Westward Propagation.
  • Editor: Elsevier B.V
  • Idioma: Inglês
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