Passage Ombai Strait and Australian NWS Susan Wijffels Bernadette Sloyan CSIRO Craig Steinberg AIMS INSTANT A PROCESS STUDY 20032006 Gaps in INSTANT Outflow measurements Sunda Australian North West Shelf very wide and shallow but warm ID: 346322
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Sustained Monitoring in the Timor Passage, Ombai Strait and Australian NWSSusan Wijffels, Bernadette Sloyan, CSIROCraig Steinberg, AIMSSlide2
INSTANT: A PROCESS STUDY 2003-2006Gaps in INSTANT Outflow measurements
Sunda
Australian North West Shelf (very wide and shallow, but warm)
Total ITF 15
Sv
(1Sv = 10
6
m
3
s
-1
)
Ombai
and Timor Passage comprise >80% of ITF transport .Slide3
INSTANT: A PROCESS STUDY 2003-2006
Timor
Strait – mean along strait flowSlide4
CSIRO. Insert presentation title, do not remove CSIRO from start of footer
Timor Section
in the
BlueLink
Reanalysis (10km)
Mean
Strongest EOFsSlide5
INSTANT: A PROCESS STUDY 2003-2006
Ombai
Strait – mean along strait flowSlide6
DESIGN
Cross shelf array extending across Timor Trench – all moorings located on Jason altimeter track
Ombai
location – same as INSTANT S.
Ombai
/JADE Mooring siteSlide7
IMOS
ITF, Kimberley & Pilbara ArraySlide8
DESIGN
High tension moorings similar to INSTANT
Upward 150kHz or 300kHz
ADCP
Downward 750kHz ADCP
Point TP (S) up to ~20-30m.
Point TPV (S) down to sill
Also deployed a PIES in
Ombai
Strait - could this help extrapolate temperature to the surface
Shelf array 6 months servicing schedule
Tall moorings 18 month servicing scheduleSlide9
IMOS 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.Slide10
TIMOR South:
Raw Current Profiles over 400m
Speed
Direction
Jul 2010
Dec 2010
Speed
Direction
Oct
2010
Oct
2010Slide11
IMOS IndoFLOW MOORINGSSlide12
IMOS IndoFLOW MOORINGSSlide13
IMOS IndoFLOW MOORINGSSlide14
IMOS IndoFLOW MOORINGS
Mooring deployments take between 3 to 5 hours. In
Ombai
Strait gas and cargo ships (approx 300m long) gave us room to drift onto the mooring site.Slide15
La Nina fresh cap
Comparison on 2011 and INSTANT 2003 Temperature, Salinity and Density profiles (0-200 m) in the Timor PassageSlide16
La Nina Fresh CapSlide17
Salinity changes 1995-2003
1995 - CTD
Oct 2002-Sep 2003
Oct 1999-Sep 2002Slide18
Predicted salinity change over the top 180 metres in the Indo-Australian Basin and observations
Change due to combined P-E of
Indo-Australian Basin and
Banda Sea (lagged by 1 year)
Change due to P-E
in Indo-Australian Basin
Predicted change =
V
orig
– (
V
orig
.S
orig
+
V
fresh
.S
fresh
) / (
V
orig
+
V
fresh
)
V
orig
= 180 m
3
,
S
orig
= 34.5,
S
fresh
= 4
Phillips et al, GRL, 2005Slide19
CONCLUSIONS AND FUTURE DIRECTIONSThe Timor Passage and Ombai Strait are now monitored. This begin the long-term monitoring of the Indonesian Throughflow
Comparison 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.Slide20
ACKNOWLEDGEMENTSSlide21
PLANS 1st turnaround of tall moorings on RV Southern Surveyor in September 2012
swath 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 estimates
assess the use of the PIES (combined with satellite SST) in addressing near surface temperature gapSlide22
Issues / Opportunities We can have the total outflow if we can instrument Lombok
Strait – this question should be a focus of TT Piggy back additional measurements on the cruises.
ACCESS/Synthesis
Can only happen if we follow the
CLIVAR principles of free and open sharing of data
Can 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 communitySlide23
ACKNOWLEDGEMENTSWe 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.