Excitation of non-atmospheric polar motion by the migration of the Pacific Warm Pool

Zhou, Yonghong; Yan, Xiao‐Hai; Ding, Xiaoli; Liao, Xinhao; Zheng, Dong; Liu, W. T.; Pan, Jiayi; Fang, Mingqiang; He, Ming-Xia

doi:10.1007/s00190-004-0380-7

Cited by 7 publications

(2 citation statements)

References 23 publications

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“…A common notable feature for the annual, semi‐annual and terannual excitations shown in Figs 4–6 is that considerable discrepancies remain between the PMEF and the total AEF wind and pressure terms, which imply the existence of non‐atmospheric sources to the polar motion excitation, like global oceans and continental water storage changes (Johnson et al 1999; Ponte & Stammer 1999; Gross et al 2003; Zhong et al 2003; Chen et al 2004; Zhou et al 2004, 2005; Chen & Wilson 2005).…”

Section: Tropospheric and Stratospheric Wind Contributions To Polarmentioning

confidence: 96%

Tropospheric and stratospheric wind contributions to Earth's variable rotation from NCEP/NCAR reanalyses (2000-2005)

Zhou

Chen

Salstein

2008

Geophysical Journal International

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SUMMARY The individual tropospheric and stratospheric wind contributions to the Earth's variable rotation during the period 2000–2005 are investigated to further our understanding of the role of wind in exciting polar motion and the variation of the Earth's rotational rate (or the length of day, LOD, change). Instead of the previous empirical approach, which simply assumed the tropopause as an equal‐pressure level, the present study employs a tropopause, which is space‐ and time‐dependent and is from the National Centers for Environmental Prediction–National Center for Atmospheric Research (NCEP/NCAR) reanalyses. For the axial component, the tropospheric and stratospheric wind effects are essentially additive. For the equatorial components, however, a significant cancellation is found between the tropospheric and stratospheric wind terms, based on the NCEP/NCAR reanalysis model.

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Section: Tropospheric and Stratospheric Wind Contributions To Polarmentioning

confidence: 96%

Tropospheric and stratospheric wind contributions to Earth's variable rotation from NCEP/NCAR reanalyses (2000-2005)

Zhou

Chen

Salstein

2008

Geophysical Journal International

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“…This is based on the fact that the depth of the 28 °C isotherm makes the IPWP an enclosed water mass, and that the onset of atmospheric deep convection occurs when temperatures exceed 28 °C (Fu et al , ). During the last few years, warm pool properties such as the surface centroid (Ho et al , ; Yan et al , , ; Fang, ), the eastern edge (Picaut et al , ; McPhaden, ) and the volume or area features (Meinen and McPhaden, , ; Yan et al , ; Zhou et al , ) have been investigated. The solar irradiance variability, El Niño–Southern Oscillation (ENSO) events and global warming possibly causes the SST and the size of the warm pool to fluctuate (Yan et al , ).…”

Section: Introductionmentioning

confidence: 99%

Trajectory patterns of the annual cycle of the heat centre of the Indo‐Pacific warm pool

Shan

Guan

Huang

2016

Intl Journal of Climatology

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ABSTRACT:The modulated annual cycle (MAC) of the Indo-Pacific warm pool (IPWP) heat centre location is investigated using the empirical mode decomposition-ensemble empirical mode decomposition method. The MAC and its interannual variability mainly affect the zonal and vertical locations of the heat centre; in fall and winter of El Niño years, the heat centre moves eastward from its normal location, with very little change in its meridional position. Four patterns of the heat centre trajectory in the IPWP are identified using the self-organizing map algorithm. Patterns 1 and 3 are both similar to a saddle, but pattern 1 is more winding. The shapes of patterns 2 and 4 are similar, but tilt in different directions: pattern 2 tilts southwest whereas pattern 4 tilts west. Of all the four patterns, the persistence of pattern 2 is generally relatively high. The trajectory of the heat centre develops in the sequence of patterns: 1-2-4-3-1. Pattern 1 (pattern 4) is related to the cold (warm) phase of the El Niño-Southern Oscillation (ENSO), while pattern 2 (pattern 3) corresponds to the negative (positive) phase of Indian Ocean dipole (IOD). The sequence of patterns in the trajectory of the heat centre in the IPWP is related to the IOD-ENSO interactions on a biennial timescale.

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Variability of the western Pacific warm pool structure associated with El Niño

Guan

et al. 2016

Clim Dyn

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Excitation of non-atmospheric polar motion by the migration of the Pacific Warm Pool

Cited by 7 publications

References 23 publications

Tropospheric and stratospheric wind contributions to Earth's variable rotation from NCEP/NCAR reanalyses (2000-2005)

Tropospheric and stratospheric wind contributions to Earth's variable rotation from NCEP/NCAR reanalyses (2000-2005)

Trajectory patterns of the annual cycle of the heat centre of the Indo‐Pacific warm pool

Variability of the western Pacific warm pool structure associated with El Niño

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