Article
Multidisciplinary Sciences
Chengyuan Pang, Maxim Nikurashin, Beatriz Pena-Molino, Bernadette M. Sloyan
Summary: In addition to local tidal mixing, remotely generated planetary waves and eddies also contribute to the mixing in the upper ocean of the Indonesian Seas. The intense mixing observed in this region plays a crucial role in the climate of the Indonesian Seas by cooling the surface temperature and affecting atmospheric convection. The energy generated in the Indian and Pacific Oceans is transported to the Indonesian Seas by planetary waves and eddies, and it is estimated that a significant amount of energy enters the region through the straits.
NATURE COMMUNICATIONS
(2022)
Article
Environmental Sciences
Harsh Raj, Ashish Narang, Ravi Bhushan
Summary: Shallow seawater coral records were used to study Indonesian throughflow (ITF) in the south-eastern tropical Indian Ocean region. The radiocarbon records of Porites corals were used to estimate lateral transport via ITF and the influence of ITF on radiocarbon levels in surface waters. A box model based on radiocarbon was applied to estimate the lateral transport and to reconstruct post-bomb radiocarbon levels.
JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
(2023)
Article
Environmental Sciences
Ryo Furue, Masami Nonaka, Hideharu Sasaki
Summary: The Indonesian Throughflow carries an average of 15 Sv of water annually from the Pacific to the Indian Ocean, with a variation of 1 to 4 Sv. A study using a global oceanic circulation model shows that the annual-mean transport of the Indonesian Throughflow differs by about 1 Sv between ensemble members. The variability of the Indonesian Throughflow is attributed to genuine changes in the flow rather than local eddies or currents within the Indonesian Seas, and may be influenced by zonal jets in the western subtropical North Pacific.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Marine & Freshwater Biology
Dongliang Yuan, Corry Corvianawatie, Muhammad Reza Cordova, Dewi Surinati, Yao Li, Zheng Wang, Xiang Li, Rui Li, Jing Wang, Lei He, Dirham Dirhamsyah, Zainal Arifin, Xiaoxia Sun, Atsuhiko Isobe, Allen N. Yuan
Summary: The abundance of microplastics fragments larger than 0.30-0.35 mm was measured in the Northwestern Pacific Ocean and the Indonesian seas. The composition of the microplastics varied, with nylon, polyester, and polyethylene being the primary types in the western Pacific, and polyethylene dominating in the Indonesian seas. The distribution of microplastics was influenced by ocean circulation, with higher abundances found in the Makassar Strait and the northeastern Maluku Sea due to river run-offs and the Indonesian Throughflow.
JOURNAL OF SEA RESEARCH
(2023)
Article
Meteorology & Atmospheric Sciences
Yaru Guo, Yuanlong Li, Fan Wang
Summary: The passage of Indonesian Throughflow water through the Indian Ocean plays a crucial role in the global ocean conveyor belt. While the exit of this water to the Atlantic Ocean through the Agulhas Current system is well-known, little is known about other possible destinations and primary pathways. Using the Connectivity Modeling System, this study reveals a robust return path of Indonesian Throughflow water to the Pacific Ocean. Vertical motions and turbulence mixing have important impacts on the water's destinations and pathways, but their effects are relatively small.
JOURNAL OF CLIMATE
(2023)
Article
Meteorology & Atmospheric Sciences
Qihua Peng, Shang -ping Xie, Rui Xin Huang, Weiqiang Wang, Tingting ZU, Dongxiao Wang
Summary: This study reveals that the slowdown of the Indonesian Throughflow (ITF) under anthropogenic warming is mainly caused by remote anomalous buoyancy forcing in the North Atlantic Ocean. Surface freshening and warming in the North Atlantic Ocean slow down the Atlantic meridional overturning circulation (AMOC), leading to a reduction in ITF transport.
JOURNAL OF CLIMATE
(2023)
Article
Oceanography
Guangbing Yang, Quanan Zheng, Xuejun Xiong
Summary: In December 2017, a subthermocline eddy (STE) with a cold and fresh core was observed in the southeastern tropical Indian Ocean (SETIO). The characteristics and origin of this STE, as well as its role in transporting Indonesian Throughflow (ITF) water, were analyzed using Argo float data. The results suggested that these STEs may be generated through topography-current interaction or front-induced subduction and could play a significant role in ITF water parcel transport in the SETIO.
ACTA OCEANOLOGICA SINICA
(2023)
Review
Geochemistry & Geophysics
Rosemary Morrow, Lee-Lueng Fu, Marie-Helene Rio, Richard Ray, Pierre Prandi, Pierre-Yves Le Traon, Jerome Benveniste
Summary: This paper reviews the recent progress in estimating ocean dynamic topography and surface geostrophic currents using multiple nadir radar altimeter missions. The altimetric observations provide a foundation for observing ocean circulation from space. The paper discusses the observation of mean ocean circulation, large-scale and mesoscale ocean circulation, ocean barotropic tides, and internal tidal circulation. It also addresses the combination and assimilation of global multi-satellite and in situ observations for characterizing the four-dimensional ocean circulation. The paper emphasizes the importance of continuity in the current observing system and proposes advancements in global wide-swath altimetry, coastal and high-latitude observations, and direct total surface current satellites in the future.
SURVEYS IN GEOPHYSICS
(2023)
Article
Environmental Sciences
Gerd Krahmann, Damian L. Arevalo-Martinez, Andrew W. Dale, Marcus Dengler, Anja Engel, Nicolaas Glock, Patricia Grasse, Johannes Hahn, Helena Hauss, Mark J. Hopwood, Rainer Kiko, Alexandra N. Loginova, Carolin R. Loescher, Marie Massmig, Alexandra-Sophie Roy, Renato Salvatteci, Stefan Sommer, Toste Tanhua, Hela Mehrtens
Summary: Funded by the German Research Foundation, the research project 'SFB 754, Climate - Biogeochemistry Interactions in the Tropical Ocean' aimed to investigate climate-biogeochemistry interactions in the tropical ocean, with a focus on oxygen distribution processes. Over three 4-year funding phases, a consortium of over 150 scientists conducted 34 major research cruises, collecting extensive physical, biological, chemical, and meteorological data, with an agreed common data policy ensuring openness in data publication.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Environmental Sciences
Jie Li, Yuanlong Li, Yaru Guo, Gang Li, Fan Wang
Summary: The southeastern Indian Ocean (SEIO) experiences prominent decadal variability in sea surface salinity (SSS), with decreases from 1995-2000 and 2005-2011 and increases from 2000-2005 and after 2011. This study successfully simulates the decadal SSS variability in the SEIO using a high-resolution regional ocean model and explores the underlying mechanism through sensitivity experiments. It is found that freshwater transport of the Indonesian throughflow (ITF) and local precipitation are the main drivers of the SSS decadal variability.
FRONTIERS IN MARINE SCIENCE
(2023)
Review
Oceanography
Cristina Arumi-Planas, Alonso Hernandez-Guerra, Veronica Cainzos, Pedro Velez-Belchi, Riccardo Farneti, Matthew R. Mazloff, Sabine Mecking, Isabella Rosso, Lena M. Schulze Chretien, Kevin G. Speer, Lynne D. Talley
Summary: The study compared meridional circulation and transport at 32 degrees S in the Pacific Ocean in 1992, 2003, 2009, and 2017, finding significant differences in circulation patterns in 2009 compared to other years.
PROGRESS IN OCEANOGRAPHY
(2022)
Article
Geography, Physical
Xiaolei Pang, Franck Bassinot, Sophie Sepulcre
Summary: This study presents a Pulleniatina obliquiloculata Mg/Ca-derived thermocline water temperature record covering the past 270,000 years in the south of the Lombok Strait, revealing changes in thermocline water temperature reflecting the balance between wind-driven Java upwelling and the Indonesian Throughflow (ITF) thermocline transport. The relative strength of ITF through time can be deciphered by the evolution of the TWT gradient between the upwelling site and the Lombok site, indicating a significant precession-related component influencing the ITF intensity at the Lombok site.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Multidisciplinary Sciences
Mochamad Riza Iskandar, Toshio Suga
Summary: The study examines the change in salinity of Indonesian Upper Water (IUW) in the Indian Ocean and reveals contrasting trends in two time periods. From 2004-2013, IUW experienced freshening, while from 2014-2020, IUW showed a general increase in salinity. The study also highlights the influence of oceanic-atmospheric processes in the Maritime Continent on the IUW salinity changes in the southeastern Indian Ocean.
Article
Oceanography
Yuanlong Li, Yaru Guo, Yanan Zhu, Shoichiro Kido, Lei Zhang, Fan Wang
Summary: Prominent interannual-to-decadal variations in heat content and mesoscale eddy activity were observed in the southeast Indian Ocean from 1993 to 2020. The study identifies the strengthening of the Indonesian Throughflow and anomalous cyclonic winds as the key drivers of these variations. The increase in eddy kinetic energy in the Leeuwin Current system significantly influences the ocean heat content.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2022)
Article
Meteorology & Atmospheric Sciences
Edward. D. D. Zaron, Tonia. A. A. Capuano, Ariane Koch-Larrouy
Summary: Twenty years of daily MODIS-Aqua ocean color observations (2002-2022) revealed periodic variability of near-surface chlorophyll (Chl a) in the Indonesian seas, with a prominent peak around the fortnightly tidal period. The spatial distribution of the fortnightly Chl a signal was quantified and mapped, showing significant variability along the continental shelves of NW Australia and at several sites associated with narrow passages between islands. The shallow coastal sites exhibited changes attributed to the spring-neap cycle of barotropic ocean currents, while deeper water near island passages showed variability due to the modulation of vertical nutrient fluxes by baroclinic tidal mixing. These findings highlight the importance of tidal mixing and the heterogeneous nature of biophysical processes in the Indonesian seas.
Article
Environmental Sciences
Samiran Mandal, Raden Dwi Susanto, Balaji Ramakrishnan
Summary: The analysis of twelve years of remotely sensed all-sat merged chlorophyll-a concentration reveals strong signatures of chlorophyll-a blooms along the south Java coast. The study shows a three-times increase in chlorophyll-a concentration during the southeast monsoon compared to the northwest monsoon. The results indicate that seasonal upwelling is predominantly controlled by coastal eddies and Ekman mass transport, with sea surface temperature and wind stress curl also playing a role. The study also finds that interannual surface chlorophyll-a variability is influenced by coastal eddies and sea surface temperature anomalies.
Article
Environmental Sciences
Raden Dwi Susanto, Richard D. Ray
Summary: The Indonesian seas play a crucial role in regulating Pacific-Indian Ocean exchange, regional air-sea interaction, and global climate phenomena. The study demonstrates that monsoon and El Nino Southern Oscillation (ENSO) have an impact on tidal mixing in the Indonesian seas, with more vigorous mixing during the southeast monsoon and El Nino. These findings have implications for long-term variations and changes in water mass transformation, circulation, and climate in the Pacific-Indian Ocean.
Article
Oceanography
Ankitha Kannad, Nathalie F. Goodkin, Dhrubajyoti Samanta, Sujata A. Murty, Riovie D. Ramos, Jason E. Smerdon, Arnold L. Gordon
Summary: The flow of Pacific water into the Indian Ocean via the South China Sea and Maritime Continent plays a crucial role in the ocean thermohaline circulation. Climate variability, such as the East Asian monsoon and major climate modes, affects the transport and salinity of the water. The recent intensification and dominance of the Indian Ocean Dipole and El Nino Southern Oscillation may have implications for regional and global thermohaline circulation.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Oceanography
Khairul Amri, Asep Priatna, Asep Ma'mun, Bram Setyadji, Tirtadanu, Ali Suman, R. Dwi Susanto, Jonson Lumban Gaol, Bisman Nababan, Muchlizar, Widodo S. Pranowo, Deni Efizon
Summary: Longtail shad, an endemic species in Siak River estuary, Riau, is facing extinction due to overfishing and habitat degradation. The government's effort to control exploitation has been hindered by weak law enforcement. A hydro-acoustic study and oceanographic surveys revealed the occurrence of spawning migration and the driving factors behind it.
OCEAN & COASTAL MANAGEMENT
(2023)
Article
Green & Sustainable Science & Technology
Iskhaq Iskandar, Deni Okta Lestari, Agus Dwi Saputra, Riza Yuliratno Setiawan, Anindya Wirasatriya, Raden Dwi Susanto, Wijaya Mardiansyah, Muhammad Irfan, Rozirwan, Joga Dharma Setiawan, Kunarso
Summary: This study examines the evolution of an extreme positive Indian Ocean Dipole (pIOD) event that occurred in the tropical Indian Ocean in 2019. It reveals patterns of anomalous sea surface temperature (SST) and precipitation, as well as their associations with forest fires and surface chlorophyll-a concentration.
Article
Computer Science, Information Systems
Suciadi Catur Nugroho, Riza Yuliratno Setiawan, Martiwi Diah Setiawati, Djumanto, Susilo Budi Priyono, R. Dwi Susanto, Anindya Wirasatriya, Rakhma Fitria Larasati
Summary: To maintain sustainable fisheries, the management of albacore tuna is regulated globally by Regional Fisheries Management Organizations. This research aims to identify optimal habitats for albacore tuna in the southeastern Indian Ocean by analyzing in situ data and satellite imagery. The results indicate that albacore tuna prefer waters with specific temperature and chlorophyll-a concentration ranges, and they are mostly captured at higher latitudes in the Indian Ocean.
Article
Oceanography
F. M. Bingham, S. K. Brodnitz, A. L. Gordon
Summary: The sea surface salinity (SSS) maximum of the South Indian Ocean (the SISSS-max) is a high-salinity feature centered at 30°S, 90°E, near the center of the South Indian subtropical gyre. It moves seasonally and interannually, with changes in size and maximum SSS, influenced by variations in evaporation, precipitation, wind forcing, gyre-scale ocean circulation, and downward Ekman pumping. The motion of SISSS-max correlates with SSS changes throughout the South Indian Ocean and may indicate changes in the basin's subtropical circulation.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Oceanography
Laura K. Gruenburg, Arnold L. Gordon, Andreas M. Thurnherr
Summary: The Indonesian Throughflow (ITF) waters move along different pathways in the Indian Ocean. The heat content anomaly (HCa) in the ITF box showed a large increase in 2011, which was not observed in the SEC box but evident in the LC box. The strength of the SEC and LC played a role in transmitting the HCa signal to different parts of the Indian Ocean.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2023)
Correction
Multidisciplinary Sciences
Melissa M. Bowen, Denise Fernandez, Arnold L. Gordon, Bruce Huber, Pasquale Castagno, Pierpaolo Falco, Giorgio Budillon, Kathryn L. Gunn, Aitana Forcen-Vazquez
SCIENTIFIC REPORTS
(2023)
Article
Environmental Sciences
Mingting Li, Ziyang Cao, Arnold L. Gordon, Fei Zheng, Dongxiao Wang
Summary: This study reveals the role of tropical Indo-Pacific oceanic interactions in driving the first triple-dip La Nina event of the twenty-first century. The subsurface warming anomalies in the eastern Indian Ocean were associated with the re-intensification of the subsequent La Nina event. These anomalies were propagated eastward by equatorial and coastal subsurface Kelvin waves and contributed to the accumulation of heat content in the western Pacific Ocean. The westward Indonesian Throughflow transported more heat during multi-year La Nina events, resulting in the injection of warm water into the eastern Indian Ocean and prolonging the heat content in the western Pacific during the decay phase of La Nina.
ENVIRONMENTAL RESEARCH LETTERS
(2023)
Article
Multidisciplinary Sciences
Erma Yulihastin, Ibnu Fathrio, Albertus Sulaiman, Rahaden Bagas Hatmaja, Haries Suaydhi, Haries Satyawardhana, Fadli Nauval, Dwiyoga Nugroho, Thomas Djamaluddin, Widodo Setiyo Pranowo, Rikha Bramawanto, Abdul Basit, Subekti Mujiasih, Mochamad Furqon Azis Ismail, Sopia Lestari, Herlina Ika Ratnawati, Jalu Tejo Nugroho, Danang Eko Nuryanto
Summary: This study investigates the long-lived propagation event of a Sumatra squall line and proposes a possible mechanism associated with it. The findings suggest that the squall line is influenced by multicell activity and low-level moist transport. The study also suggests that this long-lived squall line event might be linked to the warming upper ocean in the Indonesia Maritime Continent.
Article
Multidisciplinary Sciences
Melissa M. Bowen, Denise Fernandez, Arnold L. Gordon, Bruce Huber, Pasquale Castagno, Pierpaolo Falco, Giorgio Budillon, Kathryn L. Gunn, Aitana Forcen-Vazquez
Summary: Antarctic Bottom Water (AABW) stores heat and gases over decades to centuries and shows changes in water properties and volume. The density and speed of the outflow are controlled by the density in Terra Nova Bay and tidal mixing. Tides create peaks in density and flow each year and can explain much of the decadal variability in the outflow.
SCIENTIFIC REPORTS
(2023)
Article
Meteorology & Atmospheric Sciences
Shanice T. T. Bailey, C. Spencer Jones, Ryan P. P. Abernathey, Arnold L. L. Gordon, Xiaojun Yuan
Summary: This study investigates the variability of water mass transformation within the Weddell Gyre, which plays a crucial role in the Meridional Overturning Circulation and ocean ventilation. Recent data suggest substantial variability in Antarctic Bottom Water properties exiting the Weddell Gyre, but the thermodynamic mechanisms linking surface forcings to water mass transformations and AABW export remain unclear. This study examines current ocean reanalyses to fill the gaps in our understanding of the drivers of AABW variability.
Article
Marine & Freshwater Biology
Edmo J. D. Campos, Arnold L. Gordon, Georgenes Cavalcante, Bjon Kjerfve, Mohamed Abouleish
Summary: Warm saline water masses from the Persian Gulf and the Red Sea have a significant impact on the upper layers of the northern Indian Ocean, affecting thermocline stratification, circulation, and air-sea exchanges. By simulating the closure of the Red Sea and Persian Gulf, it is found that there are marked differences in the seasonal variability and air-sea fluxes in the Arabian Sea and Bay of Bengal. The experiments suggest that the upwelling in the southwestern Bay of Bengal would have responded differently to the El Nino-La Nina event in the absence of the Persian Gulf and Red Sea input.
OCEAN AND COASTAL RESEARCH
(2022)
Article
Environmental Sciences
R. Y. Setiawan, I. Iskandar, A. Wirasatriya, R. Dwi Susanto, E. Siswanto, W. S. Pranowo, M. D. Setiawati, W. Mardiansyah
Summary: The study analyzes the variability of coastal wind and its effect on the sea surface in the central Maluku Islands. Results show that prevailing southeasterly winds lead to cooling of sea surface temperature and phytoplankton bloom. The El Nino-Southern Oscillation and Indian Ocean Dipole play significant roles in defining the spatial distribution of oceanographic parameters.
GLOBAL NEST JOURNAL
(2022)