Oceanic channel dynamics of the IOD-ENSO teleconnection in oceanic reanalysis datasets

Xu Tengfei; Zhou Hui

doi:10.3969/j.issn.0253-4193.2016.12.003

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Xu Tengfei, Zhou Hui. Oceanic channel dynamics of the IOD-ENSO teleconnection in oceanic reanalysis datasets[J]. Haiyang Xuebao, 2016, 38(12): 23-35. doi: 10.3969/j.issn.0253-4193.2016.12.003

Citation:

Xu Tengfei, Zhou Hui. Oceanic channel dynamics of the IOD-ENSO teleconnection in oceanic reanalysis datasets[J]. Haiyang Xuebao, 2016, 38(12): 23-35. doi: 10.3969/j.issn.0253-4193.2016.12.003

Xu Tengfei, Zhou Hui. Oceanic channel dynamics of the IOD-ENSO teleconnection in oceanic reanalysis datasets[J]. Haiyang Xuebao, 2016, 38(12): 23-35. doi: 10.3969/j.issn.0253-4193.2016.12.003

Citation:

Xu Tengfei, Zhou Hui. Oceanic channel dynamics of the IOD-ENSO teleconnection in oceanic reanalysis datasets[J]. Haiyang Xuebao, 2016, 38(12): 23-35. doi: 10.3969/j.issn.0253-4193.2016.12.003

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Oceanic channel dynamics of the IOD-ENSO teleconnection in oceanic reanalysis datasets

doi: 10.3969/j.issn.0253-4193.2016.12.003

Xu Tengfei¹,
Zhou Hui²

1.
Laboratory of Marine Environment and Numerical Simulation, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China
2.
Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China

Received Date: 2016-03-20

Abstract

Abstract

IOD-ENSO lag teleconnection in oceanic reanalysis datasets (SODA, ORAS4, and NCEP GODAS) are analyzed and compared with those in observations based on lag correlation analysis. The results show significant lag correlations between the sea surface temperature anomalies (SSTA)/sea surface height anomalies (SSHA) in the southeastern tropical Indian Ocean (STIO) in fall and those in the equatorial Pacific cold tongue in the following fall in the three datasets, which are in agreement with observations. In the subsurface, lag correlations between the STIO SSTA in fall and the temperature anomalies in the equatorial Pacific vertical section show that the significant positive correlations moved eastward in the following winter through fall and outcropped at the cold tongue in the following summer and fall in both observation and assimilation datasets. The significant lag correlations between the STIO and the Pacific cold tongue are attribute to the oceanic channel dynamics, i.e., the IOD induced Indonesian Throughflow transport anomalies results in thermocline anomalies in the equatorial Pacific, driving equatorial Kelvin waves to propagate eastward, thereby contributing to the SSTA in the central-eastern Pacific cold tongue. These significant lag correlations are robust even if the ENSO signal is removed in the SODA and ORAS4 datasets, which are in agreement with those in the observations, suggesting that the oceanic channel dynamics are independent of ENSO. In comparison, the significant lag correlations have disappeared if the ENSO signal is regressed out in the GODAS dataset. Lag correlations between the Indonesian Throughflow (ITF) volume transport anomalies and the Niño 3.4/DMI indices with lag time from -12 to 12 months suggest significant influences of both ENSO and IOD events on the ITF transport in the SODA and ORAS4 datasets, consistent with the analyses of observations. The ITF transport anomalies, however, shows significant correlation only with Niño 3.4 indices in the GODAS dataset, suggesting that the ITF transport is poorly dominated by the IOD anomalies in the GODAS. This explains why the lag correlation of IOD-ENSO teleconnection disappears at one year time lag if ENSO signal was removed in the GODAS dataset.
- Indian Ocean Dipole,
- ENSO,
- teleconnection,
- oceanic channel,
- Indonesian Throughflow

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References(28)

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