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  • 1
    Online Resource
    Online Resource
    The Shallow Overturning Circulation in the Indian Ocean
    American Meteorological Society ; 2018
    In:  Journal of Physical Oceanography Vol. 48, No. 2 ( 2018-02), p. 413-434
    Details
    In: Journal of Physical Oceanography, American Meteorological Society, Vol. 48, No. 2 ( 2018-02), p. 413-434
    Abstract: The number of in situ observations in the Indian Ocean has dramatically increased over the past 15 years thanks to the implementation of the Argo profiling float program. This study estimates the mean circulation in the Indian Ocean using hydrographic observations obtained from both Argo and conductivity–temperature–depth (CTD) observations. Absolute velocity at the Argo float parking depth is used so there is no need to assume a level of no motion. Results reveal previously unknown features in addition to well-known currents and water masses. Some newly identified features include the lack of an interior pathway to the equator from the southern Indian Ocean in the pycnocline, indicating that water parcels must transit through the western boundary to reach the equator. High potential vorticity (PV) intrudes from the western coast of Australia in the depth range of the Subantarctic Mode Water, which leads to a structure similar to a PV barrier. The subtropical anticyclonic gyre retreats poleward with depth, as happens in the subtropical Atlantic and Pacific. An eastward flow was found in the eastern basin along 15°S at the depth of the Antarctic Intermediate Water—a feature expected from property distributions but never before detected in velocity estimates. Meridional mass transport indicates about 10 Sv (1 Sv ≡ 10 6 m 3 s −1 ) southward flow at 6°S and 18 Sv northward flow at 20°S, which results in meridional convergence of currents and thermocline depression at about 16°–20°S. These estimated absolute velocities agree well with those of an ocean reanalysis, which lends credibility to the strictly databased analysis.
    Type of Medium: Online Resource
    ISSN: 0022-3670 , 1520-0485
    URL: Article
    DOI: 10.1175/JPO-D-17-0127.1
    Language: Unknown
    Publisher: American Meteorological Society
    Publication Date: 2018
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  • 2
    Online Resource
    Online Resource
    The dynamics of wind-driven intraseasonal variability in the equatorial Indian Ocean : INDIAN OCEAN INTRASEASONAL VARIABILITY
    American Geophysical Union (AGU) ; 2012
    In:  Journal of Geophysical Research: Oceans Vol. 117, No. C2 ( 2012-02), p. n/a-n/a
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 117, No. C2 ( 2012-02), p. n/a-n/a
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2011JC007405
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2012
    detail.hit.zdb_id: 2033040-6
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    detail.hit.zdb_id: 2016813-5
    detail.hit.zdb_id: 2016810-X
    detail.hit.zdb_id: 2403298-0
    detail.hit.zdb_id: 2016800-7
    detail.hit.zdb_id: 161666-3
    detail.hit.zdb_id: 161667-5
    detail.hit.zdb_id: 2969341-X
    detail.hit.zdb_id: 161665-1
    detail.hit.zdb_id: 3094268-8
    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
    detail.hit.zdb_id: 3094167-2
    detail.hit.zdb_id: 2220777-6
    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
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  • 3
    Online Resource
    Online Resource
    Dual-Frequency Wind-Driven Mixed Rossby–Gravity Waves in the Equatorial Indian Ocean
    American Meteorological Society ; 2023
    In:  Journal of Physical Oceanography Vol. 53, No. 6 ( 2023-06), p. 1535-1553
    Details
    In: Journal of Physical Oceanography, American Meteorological Society, Vol. 53, No. 6 ( 2023-06), p. 1535-1553
    Abstract: Frequency spectra of in situ meridional velocity measurements in the central equatorial Indian Ocean show two distinct peaks at “quasi biweekly” periods of 10–30 days. One is near the surface at frequencies of 0.06–0.1 cpd (periods of 10–17 days) and the other is in the pycnocline (∼100-m depth) at lower frequencies of 0.04–0.06 cpd (periods 17–25 days). Analysis of a wind-forced ocean general circulation model shows that variability in the two frequency bands represents wind-driven mixed Rossby–gravity waves. The waves share a similar horizontal structure, but the meridional scale of lower-frequency variability is about one-half of that of higher-frequency variations. Higher-frequency variability has its largest amplitude in the eastern basin while the lower-frequency variability has its largest amplitude in the central basin. The vertical wavelength of lower-frequency variability is smaller by a factor of 3–4 than that of higher-frequency variability. These results are consistent with expectations from linear mixed Rossby–gravity wave theory. Numerical simulations show that the primary driver of these waves is surface wind forcing in the central and eastern Indian Ocean and that dynamical instability does not play a major role in their generation. Significance Statement Spectra of meridional velocity in the central equatorial Indian Ocean from in situ measurements show two distinct peaks in the biweekly period band with different spatial structures. This study uses an ocean general circulation model to show that variability in these two bands is driven by surface winds that are themselves spatially structured. The variability in both period bands is consistent with linear mixed Rossby–gravity wave theory, but the spatial structures, including meridional trapping scale, vertical wavelength, and zonal distribution of energy, are very different.
    Type of Medium: Online Resource
    ISSN: 0022-3670 , 1520-0485
    URL: Article
    DOI: 10.1175/JPO-D-22-0222.1
    Language: Unknown
    Publisher: American Meteorological Society
    Publication Date: 2023
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    detail.hit.zdb_id: 184162-2
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  • 4
    Online Resource
    Online Resource
    Indian Ocean dipole interpreted in terms of recharge oscillator theory
    Springer Science and Business Media LLC ; 2014
    In:  Climate Dynamics Vol. 42, No. 5-6 ( 2014-3), p. 1569-1586
    Details
    In: Climate Dynamics, Springer Science and Business Media LLC, Vol. 42, No. 5-6 ( 2014-3), p. 1569-1586
    Type of Medium: Online Resource
    ISSN: 0930-7575 , 1432-0894
    URL: Article
    DOI: 10.1007/s00382-013-1765-1
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2014
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    detail.hit.zdb_id: 1471747-5
    SSG: 16,13
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  • 5
    Online Resource
    Online Resource
    Zonal momentum budget along the equator in the Indian Ocean from a high‐resolution ocean general circulation model
    American Geophysical Union (AGU) ; 2014
    In:  Journal of Geophysical Research: Oceans Vol. 119, No. 7 ( 2014-07), p. 4444-4461
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 119, No. 7 ( 2014-07), p. 4444-4461
    Abstract: Equatorial jets in the Indian Ocean are well simulated in a high resolution OGCM Three‐dimensional nonlinear momentum advection significantly modifies jet structures Nonlinearity involves variations on intraseasonal to interannual time scales
    Type of Medium: Online Resource
    ISSN: 2169-9275 , 2169-9291
    URL: Issue
    URL: Article
    DOI: 10.1002/jgrc.v119.7
    DOI: 10.1002/2014JC009895
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2014
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    SSG: 16,13
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  • 6
    Online Resource
    Online Resource
    The dynamics of zonal current variations in the central equatorial Indian Ocean
    American Geophysical Union (AGU) ; 2008
    In:  Geophysical Research Letters Vol. 35, No. 23 ( 2008-12-02)
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 35, No. 23 ( 2008-12-02)
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/2008GL035961
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2008
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    detail.hit.zdb_id: 7403-2
    SSG: 16,13
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  • 7
    Online Resource
    Online Resource
    Dynamics of zonal current variations associated with the Indian Ocean dipole
    American Geophysical Union (AGU) ; 2010
    In:  Journal of Geophysical Research Vol. 115, No. C11 ( 2010-11-25)
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 115, No. C11 ( 2010-11-25)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2010JC006423
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2010
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    detail.hit.zdb_id: 2130824-X
    detail.hit.zdb_id: 2016813-5
    detail.hit.zdb_id: 2016810-X
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    detail.hit.zdb_id: 2016800-7
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    detail.hit.zdb_id: 161667-5
    detail.hit.zdb_id: 2969341-X
    detail.hit.zdb_id: 161665-1
    detail.hit.zdb_id: 3094268-8
    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
    detail.hit.zdb_id: 3094167-2
    detail.hit.zdb_id: 2220777-6
    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
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  • 8
    Online Resource
    Online Resource
    Wyrtki Jet dynamics: Seasonal variability
    American Geophysical Union (AGU) ; 2010
    In:  Journal of Geophysical Research Vol. 115, No. C7 ( 2010-07-14)
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 115, No. C7 ( 2010-07-14)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2009JC005922
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2010
    detail.hit.zdb_id: 2033040-6
    detail.hit.zdb_id: 3094104-0
    detail.hit.zdb_id: 2130824-X
    detail.hit.zdb_id: 2016813-5
    detail.hit.zdb_id: 2016810-X
    detail.hit.zdb_id: 2403298-0
    detail.hit.zdb_id: 2016800-7
    detail.hit.zdb_id: 161666-3
    detail.hit.zdb_id: 161667-5
    detail.hit.zdb_id: 2969341-X
    detail.hit.zdb_id: 161665-1
    detail.hit.zdb_id: 3094268-8
    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
    detail.hit.zdb_id: 3094167-2
    detail.hit.zdb_id: 2220777-6
    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
    Location Call Number Limitation Availability
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  • 9
    Online Resource
    Online Resource
    Intensification and Dynamics of the Westward Equatorial Undercurrent During the Summers of 1998 and 2016 in the Indian Ocean
    American Geophysical Union (AGU) ; 2022
    In:  Geophysical Research Letters Vol. 49, No. 20 ( 2022-10-28)
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 49, No. 20 ( 2022-10-28)
    Abstract: An anomalously strong westward Equatorial Undercurrent (wEUC) was observed in June–July (JJ) 1998 and 2016 The intensified wEUC in JJ 1998 and 2016 was driven by the co‐occurrence of strong IOD and ENSO events during 1997–1998 and 2015–2016 The dynamics are related to both directly wind‐driven and eastern‐boundary‐reflected intermediate‐order baroclinic waves
    Type of Medium: Online Resource
    ISSN: 0094-8276 , 1944-8007
    URL: Article
    DOI: 10.1029/2022GL100168
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2022
    detail.hit.zdb_id: 2021599-X
    detail.hit.zdb_id: 7403-2
    SSG: 16,13
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  • 10
    Online Resource
    Online Resource
    Predicting Interannual Variability in Sea Surface Height Along the West Coast of Australia Using a Simple Ocean Model
    American Geophysical Union (AGU) ; 2021
    In:  Geophysical Research Letters Vol. 48, No. 18 ( 2021-09-28)
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 48, No. 18 ( 2021-09-28)
    Abstract: Interannual variability in sea level along the west Australian coast can be predicted up to 13 months in advance using a simple ocean model To illustrate, the model is run in hindcast mode forced remotely by Pacific surface winds related to El Niño Southern Oscillation Model hindcasts generally outperform persistence forecasts in terms of anomaly correlation and root‐mean‐squared differences
    Type of Medium: Online Resource
    ISSN: 0094-8276 , 1944-8007
    URL: Article
    DOI: 10.1029/2021GL094592
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2021
    detail.hit.zdb_id: 2021599-X
    detail.hit.zdb_id: 7403-2
    SSG: 16,13
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