Presentation on theme: "Sustained Monitoring in the Timor Passage, Ombai Strait and Australian NWS Susan Wijffels, Bernadette Sloyan, CSIRO Craig Steinberg, AIMS."— Presentation transcript:
1Sustained Monitoring in the Timor Passage, Ombai Strait and Australian NWS Susan Wijffels, Bernadette Sloyan, CSIRO Craig Steinberg, AIMS
2INSTANT: A PROCESS STUDY 2003-2006 Total ITF 15 Sv(1Sv = 106 m3 s-1)Ombai and Timor Passage comprise >80% of ITF transport .Gaps in INSTANT Outflow measurementsSundaAustralian North West Shelf (very wide and shallow, but warm)
3INSTANT: A PROCESS STUDY 2003-2006 Timor Strait – mean along strait flow
4Timor Section in the BlueLink Reanalysis (10km) Strongest EOFsMeanCSIRO. Insert presentation title, do not remove CSIRO from start of footer
5INSTANT: A PROCESS STUDY 2003-2006 Ombai Strait – mean along strait flow
6DESIGNCross shelf array extending across Timor Trench – all moorings located on Jason altimeter trackOmbai location – same as INSTANT S. Ombai/JADE Mooring site
7IMOS ITF, Kimberley & Pilbara Array A proposed moorings array for Northern Australia
8DESIGN High tension moorings similar to INSTANT Upward 150kHz or 300kHz ADCPDownward 750kHz ADCPPoint TP (S) up to ~20-30m.Point TPV (S) down to sillAlso deployed a PIES in Ombai Strait - could this help extrapolate temperature to the surfaceShelf array 6 months servicing scheduleTall moorings 18 month servicing schedule
9IMOS IndoFLOW MOORINGS The Indonesian Throughflow array monitoring the Ombai Strait and Timor Passage was completed on 22 June 2011.The Ombai and Timor Sill moorings are in 3000 – 3400 m, and the Timor North mooring is in 1114 m.
10TIMOR South: Raw Current Profiles over 400m SpeedDirectionJul 2010Oct 2010SpeedWorking with ABOS to provide ITF NW shelf componentDirectionOct 2010Dec 2010
17Salinity changes 1995-2003 1995 - CTD Oct 1999-Sep 2002
18Predicted salinity change over the top 180 metres in the Indo-Australian Basin and observations Change due to P-Ein Indo-Australian BasinChange due to combined P-E ofIndo-Australian Basin andBanda Sea (lagged by 1 year)Predicted change = Vorig – (Vorig.Sorig + Vfresh.Sfresh) / (Vorig + Vfresh)Vorig = 180 m3, Sorig = 34.5, Sfresh = 4Phillips et al, GRL, 2005
19CONCLUSIONS AND FUTURE DIRECTIONS The Timor Passage and Ombai Strait are now monitored. This begin the long-term monitoring of the Indonesian ThroughflowComparison of Upper Ocean temperature, salinity and density profiles between 2003 and 2011 show large variability in the mixed layer and subsurface. Freshening in surface layer the result of La Nina conditions.The mooring time-series data (current, temperature and salinity) will be available via the IMOS data portal.Working with international collaborators to have the Lombok Strait re-instrumented.
21PLANS1st turnaround of tall moorings on RV Southern Surveyor in September 2012swath the cross-strait transect to the sidewallsLADCP/CTD sections – sidewall boundary layer thickness (structure is a major source of error in net transport)synthesis shelf/deep transects for full transport estimatesassess the use of the PIES (combined with satellite SST) in addressing near surface temperature gap
22Issues / Opportunities We can have the total outflow if we can instrument Lombok Strait – this question should be a focus of TTPiggy back additional measurements on the cruises.ACCESS/SynthesisCan only happen if we follow the CLIVAR principles of free and open sharing of dataCan we put all CLIVAR ITF mooring data in one place (or links to the data from one place)??aim for transport (volume,heat/unit depth) products for use by modeling community
23ACKNOWLEDGEMENTSWe thank the Master and crew of the RV Solander for their outstanding cooperation and hard work during the voyage. John Leutchford provided invaluable assistance with pre-voyage planning and electronic, computer and vessel support during the voyage. We particularly thank Peter Doherty and Frank Tirendi (AIMS) for their assistance in facilitating the cruise and the government of Timor Leste for granting permission to carry out this research. Finally we thank Akasio Dos and Nelio Arnaldo, Timor Leste observers, for their assistance during the voyage. This cruise was sponsored by the Australian Integrated Marine Observing System, CSIRO and AIMS.