Eastward propagation of the intraseasonal variability of sea ice and the atmospheric field in the marginal ice zone in the Antarctic

Baba, Kenji; Wakatsuchi, Masaaki

doi:10.1029/2001gl013219

Cited by 11 publications

(20 citation statements)

References 9 publications

(2 reference statements)

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“…An example is the Antarctic Circumpolar Wave (ACW) [ White and Peterson , 1996], which is characterized by eastward phase propagation shared by sea‐ice extent, sea surface temperature, sea level pressure, and meridional wind stress with zonal wavenumber 2 pattern on interannual timescales. On intraseasonal timescales, somewhat similar eastward propagation of sea‐ice variability was recently reported by Baba and Wakatsuchi [2001]. They have found the presence of a well‐organized eastward propagating signature in sea‐ice concentrations at periods of 10–15 days with zonal wavenumbers of 2–4, using daily sea‐ice concentration data along the marginal sea‐ice zone in the winter season.…”

Section: Introductionsupporting

confidence: 82%

“…In addition, we applied a band‐pass filter to the sea‐ice concentration data with a 5–30 day pass‐band using the Fourier transform. The pass‐band covers the time‐scales of intraseasonal variability reported by Baba and Wakatsuchi [2001]. We used the Hilbert‐transformed and band‐passed data for the CEOF analysis after removing data for the years 1992 and 2001 to avoid end effects associated with the Fourier transform.…”

Section: Methodsmentioning

confidence: 99%

“…The presence of sea ice strongly influences heat fluxes between the atmosphere and the ocean via increased albedo and insulation effects. Since sea‐ice variations in the Antarctic have the complicated spatio‐temporal structures, we need to analyze them over various timescales, including secular [e.g., Cavalieri et al 2003], interannual [e.g., White and Peterson , 1996; Yuan and Martinson , 2001], annual [e.g., van Loon , 1967; Enomoto and Ohmura , 1990], and intraseasonal [ Baba and Wakatsuchi , 2001] timescales, to understand the mechanisms.…”

Section: Introductionmentioning

confidence: 99%

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Intraseasonal variability of sea‐ice concentration in the Antarctic with particular emphasis on wind effect

et al. 2006

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[1] This study investigated mechanisms for the intraseasonal variability of sea-ice concentration in the Antarctic, using Complex Empirical Orthogonal Function (CEOF) analysis of daily sea-ice concentration data during the period 1992 through 2001 derived from images of the Defense Meteorological Satellite Program (DMSP) Special Sensor Microwave Imager (SSM/I). The first CEOF mode clearly showed that the large amplitudes of sea-ice concentration occur in the marginal sea-ice zone of the western Antarctic. The first mode also revealed the existence of eastward propagating phases with a period of 10-20 days in the western Antarctic. Regression analysis of meridional wind velocity onto the temporal coefficient of the first CEOF mode showed that the spatial phase of the meridional wind velocity precedes that of sea-ice concentration by about 90 degrees, indicating that the maximum change of sea-ice concentration occurs at the maximum wind velocity. From data analyses of ice-drifting velocity and simple sea-ice model results, it is suggested that thermodynamical effects such as sea-ice production are likely to contribute dominantly to the intraseasonal variability of sea-ice concentration in the marginal sea-ice zone of the western Antarctic.

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Section: Introductionsupporting

confidence: 82%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Intraseasonal variability of sea‐ice concentration in the Antarctic with particular emphasis on wind effect

et al. 2006

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“…Large-scale sea-level variations appeared around Antarctica for periods varying from 10 to 100 days, which had significant negative correlations with the AAO (Aoki 2002). A wavenumber-2 eastward propagating wave with a period of 10 Á 15 days appeared in the atmospheric and sea-ice fields around the Antarctic marginal ice zone in austral winter (Baba & Wakatsuchi 2001). Matthews & Meredith (2004) found that the variability of oceanic Antarctic circumpolar transport and the atmospheric SAM on intraseasonal (30 Á 70-day) timescales was related to the tropical atmospheric MJO during the southern winter.…”

Section: Earlier Work On Antarctic Intraseasonal Variabilitymentioning

confidence: 99%

The intraseasonal variability of winter semester surface air temperature in Antarctica

Zhang

Zhou

et al. 2011

Polar Research

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“…Intraseasonal variability of relationships between sea-ice and atmospheric fields were reported by Baba and Wakatsuchi (2001) and Baba and others (2006), using daily data. They showed that the intraseasonal sea-ice variability along the marginal sea-ice zone occurred as an eastwardpropagating wave and period of 10-20 days in the west Antarctic (dominant across the Bellingshausen and the Amundsen seas), with the spatial phase of the meridional wind velocity preceding sea-ice concentration by 90°.…”

Section: Introductionmentioning

confidence: 99%

Aspects of intraseasonal variability of Antarctic sea ice in austral winter related to ENSO and SAM events

Baba

Renwick

2017

J. Glaciol.

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ABSTRACT. We performed an Empirical Orthogonal Function (EOF) analysis to assess the intraseasonal variability of 5-60 day band-pass filtered Antarctic sea-ice concentration in austral winter using a 20-year daily dataset from 1995 to 2014. Zonal wave number 3 dominated in the Antarctic, especially so across the west Antarctic. Results showed the coexistence of stationary and propagating wave components. A spectral analysis of the first two principal components (PCs) showed a similar structure for periods up to 15 days but generally more power in PC1 at longer periods. Regression analysis upon atmospheric fields using the first two PCs of sea-ice concentration showed a coherent wave number 3 pattern. The spatial phase delay between the sea-ice and mean sea-level pressure patterns suggests that meridional flow and associated temperature advection are important for modulating the sea-ice field. EOF analyses carried out separately for El Niño, La Niña and neutral years, and for Southern Annular Mode positive, negative and neutral periods, suggest that the spatial patterns of wave number 3 shift between subsets. The results also indicate that El Niño-Southern Oscillation and Southern Annular Mode affect stationary wave interactions between sea-ice and atmospheric fields on intraseasonal timescales.

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Eastward propagation of the intraseasonal variability of sea ice and the atmospheric field in the marginal ice zone in the Antarctic

Abstract: Abstract. We investigate the intraseasonal variability of the sea-ice concentration in the Antarctic marginal ice zone(MIZ), using daily sea-ice and atmospheric data for eight winters (1990-97).

Cited by 11 publications

References 9 publications

Intraseasonal variability of sea‐ice concentration in the Antarctic with particular emphasis on wind effect

Intraseasonal variability of sea‐ice concentration in the Antarctic with particular emphasis on wind effect

The intraseasonal variability of winter semester surface air temperature in Antarctica

Aspects of intraseasonal variability of Antarctic sea ice in austral winter related to ENSO and SAM events

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