

FOLLOWUS
1.Key Laboratory of Ocean Circulation and Waves(KLOCW), and Institute of Oceanology, Chinese Academy of Sciences, and Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
3.Qingdao Collaborative Innovation Center of Marine Science and Technology, Qingdao 266071, China
4.University of Tokyo, Tokyo, Japan
5.Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, Colorado, USA
YUAN Dongliang, dyuan@qdio.ac.cn
Received:19 September 2016,
Accepted:30 November 2016,
Online First:03 February 2017,
Published:2018-01
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Dongliang YUAN, Xiaoyue HU, Peng XU, et al. The IOD-ENSO precursory teleconnection over the tropical Indo-Pacific Ocean:dynamics and long-term trends under global warming[J]. Chinese Journal of Oceanology and Limnology, 2018, 36(1): 4-19.
Dongliang YUAN, Xiaoyue HU, Peng XU, et al. The IOD-ENSO precursory teleconnection over the tropical Indo-Pacific Ocean:dynamics and long-term trends under global warming[J]. Chinese Journal of Oceanology and Limnology, 2018, 36(1): 4-19. DOI: 10.1007/s00343-018-6252-4.
The dynamics of the teleconnection between the Indian Ocean Dipole (IOD) in the tropical Indian Ocean and El Niño-Southern Oscillation (ENSO) in the tropical Pacific Ocean at the time lag of one year are investigated using lag correlations between the oceanic anomalies in the southeastern tropical Indian Ocean in fall and those in the tropical Indo-Pacific Ocean in the following winter-fall seasons in the observations and in high-resolution global ocean model simulations. The lag correlations suggest that the IOD-forced interannual transport anomalies of the Indonesian Throughflow generate thermocline anomalies in the western equatorial Pacific Ocean
which propagate to the east to induce ocean-atmosphere coupled evolution leading to ENSO. In comparison
lag correlations between the surface zonal wind anomalies over the western equatorial Pacific in fall and the Indo-Pacific oceanic anomalies at time lags longer than a season are all insignificant
suggesting the short memory of the atmospheric bridge. A linear continuously stratified model is used to investigate the dynamics of the oceanic connection between the tropical Indian and Pacific Oceans. The experiments suggest that interannual equatorial Kelvin waves from the Indian Ocean propagate into the equatorial Pacific Ocean through the Makassar Strait and the eastern Indonesian seas with a penetration rate of about 10%-15% depending on the baroclinic modes. The IOD-ENSO teleconnection is found to get stronger in the past century or so. Diagnoses of the CMIP5 model simulations suggest that the increased teleconnection is associated with decreased Indonesian Throughflow transports in the recent century
which is found sensitive to the global warming forcing.
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