towards cabled integration at seafloor hydrothermal vent sites k. ding, w. e. seyfried
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)
Rainbow J2-352 X3 2298m 369°C 5.00±0.02 3.25Rainbow J2-352 J-L 2309m 326°C 4.67±0.0Rainbow J2-353 X7 2300m 353°C 4.77±0.01 3.38Rainbow J2-353 T63 2262m 363°C 5.07±0.01 3.28Rainbow J2-354 T62 2261m 368°C 4.93±0.01 3.28Lucky S J2-356 T6 1719m 324°C 4.87±0.14 3.90Lucky S J2-357 1703m 298°C 4.26±0.01 3.89Lucky S J2-358 1727m 153°C 5.7±0.6
119°C 7.4±0.3TAG J2-363 T6 3621m 363°C 4.99±0.02 3.28
pH (in-situ) pH(25°C)TDepth
In-situ pH of the vent fluids (MAR)
1. Integration: previous effort384ºC
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
4.00
4.50
5.00
5.50
6.00
6.50
7.00
Hulk Dante P vent
pH
Neutrality at the condition Sensor Predicted 25ºC data
337ºC 362ºC
1. Integration: previous effort
1. A simplified method for predicting pH value of the deep reaction
2. More efforts are needed to understand its mechanism
1. Integration: previous effort
1. Integration: previous effort
100 150 200 250 300 350 4000
2
4
6
8
10
12
14
16
18
20
PPM
a x
1000
T°C
H2 S
100 150 200 250 300 350 4000.0
0.2
0.4
0.6
0.8
1.0
PPM
ax
1000
T°C
H2 Dynamic processes occurring at the vent orifice showing critical behavior, conduct cooling and mixing, which are P-T sensitive
1. Integration: previous effort
0 17280 34560 51840 69120 86400364
365
366
367
368
369
370
To 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
2. Integration: current effort: CALLISTO
Sensor protection and cleaning
Correction for the drift
Cycle Sample Potential (mV)
Temperature (°C)
Theoretical slope
Actual Slope Calculated pH
1Seawater 173.3±0.4 5.8
55.4 56.8 7.54±0.01Buffer 1 391.7±0.3 5.8Buffer 2 10.3±0.6 5.5
2Seawater 176.4±0.6 5.6
55.3 57.4 7.58±0.01Buffer 1 399.4±0.3 5.6Buffer 2 14.0±0.5 5.3
3Seawater 54.2±1.7 6.1
55.4 57.3 7.51±0.03Buffer 1 272.6±0.4 5.6Buffer 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 operatedThe 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
Co
mb
ined
op
erat
ion
wit
h in
-sit
u
sen
sor,
pH
cal
ibra
tor
and
gas
-tig
ht
sam
ple
r th
rou
gh
cab
led
net
wo
rk
Thanks!
Future effort: Adding more function to achieve active
observation and in-situ intervention.
080801 0930 080801 1130 080801 1330-200
-100
0
100
200
300
400
500
pH(std)=10
Lost City M6 Calib G Yw
mV
time
pH(std)=4pH=7.860±0.004T=11 ̊C
20:56:38 3:53:18 10:49:58 17:46:38 0:43:18 7:39:58 14:36:38
-400
-200
0
200
400
mV
time
H2
Calib 9oN EPR TICA
dissolved H2 level
T=5.5oC
Lost City M6 CL iTwo: in-situ calibration