Long-Wave Dynamics of Sea Level Variations during Indian Ocean Dipole Events

Yuan, Dongliang; Liu, Hailong

doi:10.1175/2008jpo3900.1

Cited by 68 publications

(30 citation statements)

References 24 publications

(38 reference statements)

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“…Kelvin and Rossby waves play an important role on the dynamics and thermodynamics of the tropical Indian Ocean during IOD. The propagation of these ocean waves, and their contribution to the evolution of IOD has been elaborated in previous studies [e.g., Murtugudde and Busalacchi , ; Vinayachandran et al ., ; Webster et al ., ; Rao et al ., ; Vinayachandran et al ., ; Han et al ., ; Yuan and Liu , ]. The results of our simulations are consistent with previous findings.…”

Section: Experiments and Resultsmentioning

confidence: 99%

Dynamical mechanisms for asymmetric SSTA patterns associated with some Indian Ocean Dipoles

Sun

Fang

et al. 2014

J. Geophys. Res. Oceans

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Indian Ocean Dipole (IOD) can be divided into two types according to their SST anomaly (SSTA) patterns: the symmetric IODs and the asymmetric IODs. Dynamical mechanisms for the two types of IODs are investigated using an ocean general circulation model, and the numerical experiments indicate that the setup time of the equatorial easterly wind anomalies (EEWA) associated with IODs is crucially important for the symmetrical characteristics of the SSTA patterns. Early setup of the EEWA in spring can induce intense cooling in the east pole but weak warming in the west pole, making the two poles asymmetric. The intense cooling in the east pole is linked to the seasonal variations of thermocline depth, horizontal SST gradient, and unusually long duration of the EEWA, and the weak warming in the west pole is due to unusually cold zonal advection resulted from zonal SST gradient change. The numerical experiments demonstrate that the strength of the EEWA also plays an important role in the symmetrical characteristics of IODs. The SSTA in the two poles both intensify as the EEWA strength increases only when the EEWA speed is below a critical value. Above the critical value, the warming in the west pole starts to decrease while the cooling in the east pole still keeps increasing, leading to an asymmetric SSTA pattern. The mechanism behind this phenomenon is similar to the one in the situation when EEWA sets up earlier.

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Section: Experiments and Resultsmentioning

confidence: 99%

Dynamical mechanisms for asymmetric SSTA patterns associated with some Indian Ocean Dipoles

Sun

Fang

et al. 2014

J. Geophys. Res. Oceans

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“…The evolution of the IOD event is strongly influenced by the equatorial oceanic wave dynamics (Chamber et al 1999;Webster et al 1999;Vinayachandran et al 1999;Rao et al 2002;Feng and Meyers 2003;Rao and Yamagata 2004;Yuan and Liu 2009;Iskandar et al 2013). Thermocline shoaling in the eastern basin is associated with the propagation of upwelling equatorial Kelvin waves generated by easterly wind anomalies during pIOD event evolution.…”

Section: Role Of Equatorial Wavesmentioning

confidence: 99%

Equatorial Oceanic Waves and the Evolution of 2007 Positive Indian Ocean Dipole

Iskandar¹,

Mardiansyah²,

Setiabudidaya³

et al. 2014

Terr. Atmos. Ocean. Sci.

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The role of equatorial oceanic waves on the evolution of the 2007 positive Indian Ocean Dipole (pIOD) event was evaluated using available observations and output from a quasi-analytical linear wave model. It was found that the 2007 pIOD event was a weak and short-lived event: developed in the mid-summer (July), matured in the early-fall (September), and terminated in the mid-fall (October). The evolution of the 2007 pIOD event was linked to the equatorial wave dynamics. The event development was associated with the generation of upwelling equatorial Kelvin waves (westward current anomalies) generated by easterly wind anomalies. The event termination was associated with the occurrence of eastward zonal current anomalies resulting from a complex interplay between the wind-forced down welling Kelvin waves and the eastern-boundary-reflected Rossby waves. Results from a quasi-analytical linear wave model show that during the event development and maturation, the wind-forced Kelvin waves played a dominant role in generating zonal current anomalies along the equatorial Indian Ocean, while the easternboundary-reflected Rossby waves tended to weaken the wind-forced Kelvin wave signals. During the event termination our model shows that the initiation of anomalous eastward current resulted from the reflected Rossby waves at the eastern boundary. The wind-forced Kelvin waves associated with the seasonal reversal of the monsoon further strengthened the eastward zonal currents generated by the boundary-generated Rossby waves in late-October/early-November. This highlights the importance of the eastern-boundary-reflected Rossby waves on the IOD event termination.

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“…The basin-wide ocean general circulation model (OGCM) of the Pacific Ocean is configured from a 3D global OGCM called LICOM (Liu et al, 2004;Yuan and Liu, 2009). With the basic frame of LICOM (e.g., the primary equation, free surface, η-vertical coordinate, the Arakawa B-grid scheme), the model domain is the entire Pacific Ocean (latitude 75 • S-65 • N and longitude 98 • -291 • E) with the horizontal resolution 1.0 • ×1.0 • .…”

Section: The Pacific Ocean Modelmentioning

confidence: 99%

Uptake and storage of anthropogenic CO2 in the pacific ocean estimated using two modeling approaches

2012

Adv. Atmos. Sci.

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A basin-wide ocean general circulation model (OGCM) of the Pacific Ocean is employed to estimate the uptake and storage of anthropogenic CO2 using two different simulation approaches. The simulation (named BIO) makes use of a carbon model with biological processes and full thermodynamic equations to calculate surface water partial pressure of CO2, whereas the other simulation (named PTB) makes use of a perturbation approach to calculate surface water partial pressure of anthropogenic CO2. The results from the two simulations agree well with the estimates based on observation data in most important aspects of the vertical distribution as well as the total inventory of anthropogenic carbon. The storage of anthropogenic carbon from BIO is closer to the observation-based estimate than that from PTB. The Revelle factor in 1994 obtained in BIO is generally larger than that obtained in PTB in the whole Pacific, except for the subtropical South Pacific. This, to large extent, leads to the difference in the surface anthropogenic CO2 concentration between the two runs. The relative difference in the annual uptake between the two runs is almost constant during the integration processes after 1850. This is probably not caused by dissolved inorganic carbon (DIC), but rather by a factor independent of time. In both runs, the rate of change in anthropogenic CO2 fluxes with time is consistent with the rate of change in the growth rate of atmospheric partial pressure of CO2.

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Long-Wave Dynamics of Sea Level Variations during Indian Ocean Dipole Events

Cited by 68 publications

References 24 publications

Dynamical mechanisms for asymmetric SSTA patterns associated with some Indian Ocean Dipoles

Dynamical mechanisms for asymmetric SSTA patterns associated with some Indian Ocean Dipoles

Equatorial Oceanic Waves and the Evolution of 2007 Positive Indian Ocean Dipole

Uptake and storage of anthropogenic CO2 in the pacific ocean estimated using two modeling approaches

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