The heat transport of the Indonesian Throughflow and implications for the Indian Ocean heat budget

Vranes, Kevin; Gordon, Arnold L.; Ffield, Amy

doi:10.1016/s0967-0645(01)00150-3

Cited by 120 publications

(120 citation statements)

References 58 publications

Supporting

Mentioning

103

Contrasting

Order By: Relevance

“…Difference between model results with the ITF open and closed show that there are significant changes in heat flux in regions such as seas around eastern Australia (Tasman Sea), western Australia (Leeuwin Current), southern Indian Ocean (Agulhas Current), North Pacific and South Pacific . It is likely that most of the ITF heat transport derived from the Pacific Ocean is lost to the atmosphere in the southwest Indian Ocean (Godfrey 1996), consistent with assessment from observations (Vranes et al 2002).…”

Section: The Role Of the Itf On Ocean Circulation And Climatesupporting

confidence: 76%

“…Numerical models and observations have indicated that changes in ocean circulation associated with the ITF are likely to affect patterns of circulation, thermal structure and air-sea exchange in widely separated regions (Macdonald 1993;Godfrey 1996;Lee et al 2002;Vranes et al 2002). In the Indian Ocean, the ITF is shown to warm the Agulhas Current and the region off the south coast of Java and Sumatra, strength the Leeuwin Current system and increase the steric height throughout the Indian Ocean (Qu et al 1994;Godfrey 1996).…”

Section: The Role Of the Itf On Ocean Circulation And Climatementioning

confidence: 99%

“…Some of the ITF water recirculates in the Eastern Gyral Current before feeding the Leeuwin Current (Domingues et al 2007;Menezes et al 2013;Van Sebille et al 2014). The ITF transport is important for basin-scale heat and freshwater budget in both the Pacific and Indian Ocean (Vranes et al 2002).…”

Section: Sources and Pathways Of The Itf Watermentioning

confidence: 99%

See 2 more Smart Citations

The Indonesian throughflow, its variability and centennial change

et al. 2018

View full text Add to dashboard Cite

The Indonesian Throughflow (ITF) is an important component of the upper cell of the global overturning circulation that provides a low-latitude pathway for warm, fresh waters from the Pacific to enter the Indian Ocean. Variability and changes of the ITF have significant impacts on Indo-Pacific oceanography and global climate. In this paper, the observed features of the ITF and its interannual to decadal variability are reviewed, and processes that influence the centennial change of the ITF under the influence of the global warming are discussed. The ITF flows across a region that comprises the intersection of two ocean waveguides-those of the equatorial Pacific and equatorial Indian Ocean. The ITF geostrophic transport is stronger during La Niñas and weaker during El Niños due to the influences through the Pacific waveguide. The Indian Ocean wind variability associated with the Indian Ocean Dipole (IOD) in many years offsets the Pacific ENSO influences on the ITF geostrophic transport during the developing and mature phases of El Niño and La Niña through the Indian Ocean waveguide, due to the co-varying IOD variability with ENSO. Decadal and multi-decadal changes of the geostrophic ITF transport have been revealed: there was a weakening change from the mid-1970s climate regime shift followed by a strengthening trend of about 1Sv every 10 year during 1984-2013. These decadal changes are mostly due to the ITF responses to decadal variations of the trade winds in the Pacific. Thus, Godfrey's Island Rule, as well as other ITF proxies, appears to be able to quantify decadal variations of the ITF. Climate models project a weakening trend of the ITF under the global warming. Both climate models and downscaled ocean model show that this ITF weakening is not directly associated with the changes of the trade winds in the Pacific into the future, and the reduction of deep upwelling in the Pacific basin is mainly responsible for the ITF weakening. There is a need to amend the Island Rule to take into account the contributions from the overturning circulation which the current ITF proxies fail to capture. The implication of a weakened ITF on the Indo-Pacific Ocean circulation still needs to be assessed.

show abstract

Section: The Role Of the Itf On Ocean Circulation And Climatesupporting

confidence: 76%

Section: The Role Of the Itf On Ocean Circulation And Climatementioning

confidence: 99%

See 1 more Smart Citation

The Indonesian throughflow, its variability and centennial change

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Climate). The ITF allows a substantial amount of heat to be transported from the Pacific into the Indian Ocean: on the order of 0.5 PW (Vranes et al 2002). The ITF annual transport estimates hover around 10 Sverdrups (1 Sv [ 10 6 m 3 s 21 ), with substantial seasonal and interannual variations (see Potemra 1999;Gordon 2005;Potemra and Schneider 2007;Wijffels et al 2008).…”

Section: Introductionmentioning

confidence: 99%

The Role of the Indonesian Throughflow on ENSO Dynamics in a Coupled Climate Model

et al. 2011

View full text Add to dashboard Cite

The effects of the Indonesian Throughflow (ITF) on ENSO dynamics are studied in a coupled climate model by comparing two simulations, one with an open ITF and the other with a closed ITF. Closing the ITF results in an El Niñ o-like climate state in the Pacific, which is characterized by weakened trade winds, a flatter equatorial thermocline, and weaker equatorial upwelling. A weakened South Equatorial Current allows the western Pacific warm pool to extend eastward, thereby reducing the zonal temperature gradient along the equator. The interdecadal component of the ENSO-like variability collapses, although the interannual variability is maintained. The core region of the ENSO SST anomalies becomes confined farther east. This results from Bjerknes feedback processes that are shifted eastward. This study conducts an analysis utilizing the Bjerknes coupled stability index as formulated by Jin et al. and finds that the relative importance of the thermocline feedback is enhanced in the closed ITF experiment. This indicates a more prominent ENSO thermocline mode, thus explaining the existence of more prevalent eastward-propagating anomalies. A weaker zonal advective feedback due to the reduced mean zonal temperature gradient contributes to the dominance of the thermocline mode. The strength of the thermocline feedback itself is maintained by enhanced coupling between the zonal wind stress and the east-west thermocline slope. However, an increased thermal damping by air-sea heat flux dominates the overall ENSO feedback process.

show abstract

“…All of these species could be present in the eastern Indian Ocean, considering that these larvae grow for many months reaching large sizes, and they could be transported long distances by ocean currents. It is well documented that water from the Indonesian Seas flows into the eastern Indian Ocean (Hautala et al 2001;Vranes et al 2002), and equatorial current jets can transport water in both directions across the northern Indian Ocean (Thompson et al 2006;Sengupta et al 2007;Kantha et al 2008). This makes it likely that some species reported to be present as juveniles or adults in western Indonesia, the South China Sea, or the western Indian Ocean could also be present off western Sumatra.…”

Section: Discussionmentioning

confidence: 99%

Ariosoma-type Leptocephali (Congridae: Bathymyrinae) in the Mentawai Islands region off western Sumatra, Indonesia

et al. 2013

View full text Add to dashboard Cite

Background: Ariosoma-type leptocephali of the congrid subfamily Bathymyrinae are typically present in tropical and subtropical regions where they reach large sizes and are often abundant compared to other taxa. Different morphological species types of these larvae have been documented in the Indo-Pacific region, but few have been matched with their adult species, and their life histories are not known.

show abstract

The heat transport of the Indonesian Throughflow and implications for the Indian Ocean heat budget

Cited by 120 publications

References 58 publications

The Indonesian throughflow, its variability and centennial change

The Indonesian throughflow, its variability and centennial change

The Role of the Indonesian Throughflow on ENSO Dynamics in a Coupled Climate Model

Ariosoma-type Leptocephali (Congridae: Bathymyrinae) in the Mentawai Islands region off western Sumatra, Indonesia

Contact Info

Product

Resources

About