The Southern Ocean Time Series moored observatory A technical and scientific review
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1 The Southern Ocean Time Series moored observatory A technical and scientific review Presented by Diana Greenslade on behalf of: Eric Schulz 1,Tom Trull 2 & Simon Josey 3 1 CAWCR, Bureau of Meteorology 2 CAWCR, CSIRO, UTAS, ACECRC 3 NOCS October 2012
2 Motivation The Southern Ocean is large (22% of world ocean) and is expected to play a significant role in the global climate system Role in the carbon, heat and mass cycle? Very few in situ observations due to harsh and remote nature Poorly constrained for these air-sea fluxes How much carbon is trapped in the deep ocean? How much heat absorbed, transported and released? The Sub-Antarctic Zone occupies half of the Southern Ocean and is a region of extensive surface water subduction
3 Southern Ocean observations OceanSITES Flux Reference Stations (2010) Operating Under construction Wish list International Ocean Carbon Coordination Project
4 Southern Ocean observations Summer (DJF) Winter (JJA) Average number of observations per season ( ) FSU Heat fluxes (credit: M. Bourassa)
5 SOTS Location Southern Ocean Time Series Observatory Funded by IMOS Operated by Bureau, CSIRO & UTAS 3 Moorings Gliders & Profiling Floats SOTS S, 142 E 350 NM SW of Tasmania Situated centrally in the Sub Antarctic Zone, with strong biological activity Australian sector of the Southern Ocean Pilot deployment flux buoy at 60 S 140 E, 2012, JAMSTEC
6 Southern Ocean Time Series Sustained Ocean observatory Multidisciplinary (met, ocean, BGC) Multiple platforms SAZ mooring (sediment traps) transfer of carbon to deep ocean Pulse mooring (BGC) consumption of CO 2 in mixed layer SOFS mooring (weather, fluxes, CO 2 physical ocean) physical fluxes through ocean surface Gliders (physical and BCG) spatial context & vertical profiles Drifting Profilers (physical and BGC) spatial context & vertical profiles
7 Data availability Started with SAZ sediment traps in 1997 Added Pulse BGC in 2009 summer only; annual since 2011 Added SOFS in 2010 Dedicated profilers (2005) & gliders (2010) Halted in 2011 with technical issues Gaps in SAZ are due to instrument and mooring failures
8 Data from SAZ Seasonal cycle of biogenic fluxes to deep ocean moored sediment traps Short pulses account for large fractions of the total annual flux
9 Pulse observations Chlorophyll at 35m (red) PAR in blue 200 Photosynthetic Active Radiation and surface mixed layer Chlorophyll Pulse 7 CHL and PAR vs Time umol photons/m^2/s CHL Lagged correlation with PAR over week-long timescales umol photons/m^2/s CHL (counts) /09/2010 0:00 19/09/2010 0:00 24/09/2010 0:00 29/09/2010 0:00 4/10/2010 0:00 9/10/2010 0:00 14/10/2010 0:00 19/10/2010 0:00 Time
10 Pulse application Surface mixed layer oxygen variations during Pulse-7 Total dissolved oxygen saturation (blue) Expected levels due to physical processes (red) Difference due to biology (net community production) Weeding and Trull, manuscript in preparation
11 SOFS observations 9-month refurbishment gap between SOFS1 & 2, now backto-back deployments Winds peaking ~50kts Distinct solar radiation annual cycle SOFS3 data plotted is hourly and real-time, (rather than 1 minute delayed mode) so less variability than SOFS1 & 2 Buoy Refurbishment
12 SOFS observations - waves Waves from buoy motion Accelerations sampled at 5 Hz for minutes every hour Real-time telemetry of spectrum, SWH SOFS1 (Mar to Dec 2010) Max SWH measured at 21 m Also measured on Pulse buoy SOFS2 (Dec Jul 2012)
13 SOFS application: Air-Sea Fluxes Bulk fluxes from SOFS1: March March 2011 Net deployment - ocean cooling of 10 Wm -2 Asymmetric seasonal signal in Net Incoming SW dominates seasonal signal Severe short-term ocean turbulent cooling events (>400 Wm -2 ) with cold, dry southerly winds. Frequent ocean heating events from sensible heat flux (Hs) Ocean heat content shows trend agreement with air-sea flux on seasonal scale. See Schulz et al., 2012, GRL
14 SOFS application: NWP Flux Verification Monthly means RMS Difference SOFS, OAFlux & NCEP Latent and sensible heat flux in reasonable agreement across all 3 datasets RMS differences smaller for OAFlux Indicates improvement relative to NCEP No radiative/net heat flux information for OAFlux over this period NCEP net long wave flux has stronger heat loss than buoy Results in persistent NCEP net heat flux bias of Wm -2 too much heat loss relative to SOFS Thanks to Simon Josey (NOCS) OAFlux data thanks to Lisan Yu March 2010 March 2011
15 Summary Sustained, year-round observations in the Sub-Antarctic Zone are high value due to their rarity in this remote and harsh Southern Ocean region. SOTS is now over a decade old with recent enhancements to make it a multi-disciplinary carbon, heat and mass ocean observatory. Starting to capture interannual variability as well as high frequency dayweek scale events. Sustained observations require a sustained commitment to operate. This is a challenge!
16 Eric Schulz, Tom Trull, & Simon Josey Web: Thank you
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