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Earth Institute Research Projects

Collaborative Research: Measurements and Modelling of the Indonesian Throughflow International Experiment (MINTIE)

Lead PI: Professor Arnold L. Gordon

Unit Affiliation: Ocean & Climate Physics, Lamont-Doherty Earth Observatory (LDEO)

June 2019 - May 2021
Active
Asia ; Indonesian Seas
Project Type: Research

DESCRIPTION: Located near the largest global centers of atmospheric deep convection and featuring the only inter-basin tropical connection in the global overturning circulation, the Indonesian seas play a fundamental role in the coupled climate system. Pacific Warm Pool waters are cooled and freshened in the Indonesian seas to form a unique water mass that can be tracked across the Indian Ocean basin and beyond. Tidally-driven mixing plays a critical role in this transformation and impacts regional upwelling, sea surface temperature (SST) patterns and thus global climate. Since the highly successful INSTANT program delivered a step change in our understanding of the Indonesian Throughflow (ITF) over 12 years ago, sparse ongoing observations and regional modelling studies have exposed our remaining knowledge gaps. In particular, we have little knowledge on how the interplay between the ITF, incoming remotely-forced wind-driven planetary wave energy and locally generated internal tidal waves and the mixing they produce impacts export heat and freshwater fluxes and SST. Addressing these issues requires more detailed observations of internal hydrography, mixing rates and inflowing/outflowing heat and freshwater fluxes. In addition, since the end of INSTANT in 2006, a significant shift has occurred in the Indo-Pacific system, and likely also the ITF.

This project includes: In early 2021 we are planning a 3-year deployment of a transport and water mass resolving mooring array within the major ITF passages, simultaneous profiling Argo type float sampling the hydrography, dissipation and fine-scale shear in the interior seas, as well as ship-based detailed surveys in the ITF straits. MINTIE will also employ state-of-the-science simulations and diagnostic tools in combination with the observations, to probe the drivers and dynamics of the ITF pathways and variability.

SPONSOR:

National Science Foundation (NSF)

FUNDED AMOUNT:

$482,961

WEBSITE:

https://www.nsf.gov/awardsearch/showAward?AWD_ID=1851257&HistoricalAwards=false

PUBLICATIONS:

Napitu, A., K. Pujiana, A.L. Gordon (2019) The Madden-Julian Oscillation’s Impact on the Makassar Strait Surface Layer Transport. Journal of Geophysical Research Oceans: Recent Progresses in Oceanography and Air-Sea Interactions in Southeast Asian Archipelago. 124, 3538–3550. https://doi.org/10.1029/ 2018JC014729

Lee, Tong, Séverine Fournier, Arnold L. Gordon, Janet Sprintall (2019) Maritime Continent Water Cycle Regulates Low-latitude Chokepoint of Global Ocean Circulation, Nature Communications, 10.1038/s41467-019-10109-z.

Pujiana, Kandaga, Michael J. McPhaden , Arnold L. Gordon , Asmi M. Napitu (2019) Unprecedented response of Indonesian throughflow to anomalous Indo-Pacific climatic forcing in 2016. Journal of Geophysical Research Oceans: Recent Progresses in Oceanography and Air-Sea Interactions in Southeast Asian Archipelago. 124, 3737–3754. https://doi.org/10.1029/2018JC014574.

Gordon, Arnold L., Asmi Napitu, Bruce A. Huber, Laura K. Gruenburg, Kandaga Pujiana, Teguh Agustiadi, Anastasia Kuswardani, Nurman Mbay, Agus Setiawan (2019) Makassar Strait Throughflow Seasonal and Interannual Variability, an Overview. Journal of Geophysical Research Oceans: Recent Progresses in Oceanography and Air-Sea Interactions in Southeast Asian Archipelago.124, 3724–3736, https://doi.org/10.1029/2018JC014502

Murty, S. A., Goodkin, N. F., Wiguna, A. A., & Gordon, A. L. (2018). Variability in coral-reconstructed sea surface salinity between the northern and southern Lombok Strait linked to East Asian winter monsoon mean state reversals. Paleoceanography and Paleoclimatology, 33. https://doi.org/ 10.1029/2018PA003387

Gruenburg, L.K., and A.L. Gordon (2018) Variability in Makassar Strait heat flux and its effect on the eastern tropical Indian Ocean. Oceanography 31(2), Guest Editors: Paul J. Durack, Lars H. Smedsrud Alex Sen Gupta https://doi.org/10.5670/oceanog.2018.220.

Mingting Li, Arnold L. Gordon, Jun Wei, Laura K. Gruenburg, and Guoqing Jiang (2018) Multi-decadal time series of the Indonesian Throughflow. Dynamics of Atmospheres and Oceans. Volume 81: 84-95, https://doi.org/10.1016/j.dynatmoce.2018.02.001

Linsley, B. K., H. C. Wu, T. Rixen, C. D. Charles, A. L. Gordon, and M. D. Moore (2017), SPCZ zonal events and downstream influence on surface ocean conditions in the Indonesian Throughflow region, Geophys. Res. Lett., 43, doi:10.1002/2016GL070985.

KEYWORDS

atmospheric deep convection sea surface temperature oceanography indonesian throughflow modeling freshwater flux hydrography forecast circulation

THEMES

Modeling and Adapting to Future Climate