Presentation on theme: "Towards Cabled Integration at Seafloor Hydrothermal Vent Sites K. Ding, W. E. Seyfried."— Presentation transcript:
Towards Cabled Integration at Seafloor Hydrothermal Vent Sites K. Ding, W. E. Seyfried
Collaboration with: Dr. Chunyang Tan (Tongji University) Dr. Shijun Wu (Zhejiang University) Dr. Tao Li (University of Michigan) Dr. Yogesh B. Gianchandani (University of Michigan) MARS Operation Group, (MBARI) AGU Presentations: OS41C-1749 Chunyang Tan, Kang Ding and William E. Seyfried, Jr., Instrument development and field application of the in situ pH Calibrator at the Ocean Observatory. OS41C-1743 Shijun Wu, Canjun Yang, Kang Ding and Chunyang Tan. A remotely operated time-series sampler for collecting gas-tight hydrothermal fluids.
Objectives In-situ measurement, in-situ calibration and in-situ intervention with cabled connection for studying evolution circle of seafloor hydrothermal system Current and Expected Deployment 1.MARS connection (Nov. 13, 2012 –2013) 2. Alvin cruise at Main Endeavour Field (Sept. 2013) 3. RSN Axial Seamount (2014) 4. Neptune Canada Main Endeavour Field (2013 - 2014) through collaboration with University of Victoria (CFI)
100150200250300350400 0 2 4 6 8 10 12 14 16 18 20 PPM a x 1000 T ° C H 2 S Dynamic processes occurring at the vent orifice showing critical behavior, conduct cooling and mixing, which are P-T sensitive 1. Integration: previous effort 01728034560518406912086400 364 365 366 367 368 369 370 T o C time (24 hr= 17280)
2. Integration: current effort Integration with MEMS and Nano Technology for Enhanced Application and Reliability
Sensor with in- situ calibration Ga-tight Sampler Active observatory Cable 2. Integration: current effort: CALLISTO
CALLISTO (Calibrator Linked In-situ Timed Observatory) MARS Connection and Testing (Nov. 12, 2012 – 2013) 1.Active intervention; with remotely controlled operation; 2.In-situ measurement with in-situ calibration; 3.In-situ measurement with sampling 2. Integration: current effort: CALLISTO
(1)Utilizing the electric and communication power for operation of the pumps and valves. (2)Designed for application up to 100C. 2. Integration: current effort: CALLISTO
Sensor protection and cleaning Correction for the drift
CycleSample Potential (mV) Temperature (°C) Theoretical slope Actual Slope Calculated pH 1 Seawater173.3±0.45.8 55.456.87.54±0.01 Buffer 1391.7±0.35.8 Buffer 210.3±0.65.5 2 Seawater176.4±0.65.6 55.357.47.58±0.01 Buffer 1399.4±0.35.6 Buffer 214.0±0.55.3 3 Seawater 54.2 ±1.7 6.1 55.457.37.51±0.03 Buffer 1272.6±0.45.6 Buffer 2 -111.6 ±0.3 5.4 2. Integration: current effort: CALLISTO Results from MARS connection and Testing
Control module Sampling modules 2. Integration: current effort: CALLISTO Integration with high T gas-tight fluid sampler Autonomous and remotely controlled operation 160 ml
2. Integration: current effort: CALLISTO Open valve Close valve The record of current during triggering the sampling module Operations styles: (1) Pre-scheduled; (2) Sensor trigged; (3) Remotely operated The operation can be verified by the reading on the current. Added freedom on high temperature gas-tight sampling for study hydrothermal vents
2. Integration: current effort: CALLISTO Combined operation with in-situ sensor, pH calibrator and gas-tight sampler through cabled network
Thanks! Future effort: Adding more function to achieve active observation and in-situ intervention.
pH=7.860±0.004 T=11 ̊C Lost City M6 CL iTwo: in-situ calibration