18 JANUARY 2000
Pilot in Training: Phil Forte
Alvin enters the water surrounded by a large
pod of pilot whales off R/V Atlantis starboard
08:11 Alvin dives.
09:11 1500 m, powered on electrochemistry and tested
wand temperature probe.
09:29 2629X, 1352Y. Neutral trim and simulated a
hard ground for Pilot in Training.
09:43 Forward Niskin fired for ambient water. 2607X,
1379Y. 2007 m, hdg 147.
10:02 Spotted microbial mat at XY 2724 : 1289 2013
10:10 Hi-Temperature Probe: 9.6° C, max. at 12.6°
C. Began DLK electrode scans on wand.
10:22 Sipper #1 sample taken, but pump was not turned
on. Turned on pump and began flow-cell electrode checks
10:28 Sipper #2 fired in oxygenated water.
10:41 Four cores taken in mat. First was Core #4
(Alvin). Then Core #1 (UD at 10:46). Core #3 (UD at
10:52) 3-chip camera recorded a good core. Last core was
Core # 2 (Alvin at 10:58) and mat was intact via
3-chip video. Temp was 12.9° C max.
11:02 Began sonar search.
11:15 Departed for Rebeccas Roost. Hdg 241.
Saw many crabs on the way.
11:26 Riftia clump observed at 2632X, 1224Y.
11:39 2615X, 1234Y toppled over a beehive structure
good for major and/or gas-tight sampling in the future.
296.4° C at orifice; 298.5° C at mouth of orifice;
270° C at orifice again, 170° C about 8 cm above
12:01 Departed for twin-tower structures detected
12:03 2607X, 1178Y. Riftia with polychaetes
~ 17° C. 1997 m.
12:23 Electrochemical scans taken at Riftia.
12:33 Sipper sample # 3 taken.
Niskin # 2 taken in diffuse flow above Riftia.
12:52 Wand in Riftia for electrochemical analyses.
12:58 ~ 10 Riftia collected. Began search
for new sulfide structures.
13:24 Reached XY 2604 : 1172 1989m. Noted flange
below Riftia. Max Temp 244 oC. Upper and right part ranged
from 10 to 110 oC. Began Electrochemical and noted significant
sulfide levels (tens of micro-molar) that changed with time.
13:39 Sipper #4 sample taken.
13:55 Sipper #5 sample taken. Sulfide structure appears
to be 15 m tall.
14:21 Sulfide sample taken and put in forward box.
Began new search with sonar.
14:27 2618X, 1185Y. Another mat with shimmering water
of 80° 90° C max.
14:32 Started to go farther west.
14:59 2378X, 847 Y. Found tall structure noted from
the tall site of 1988.
15:05 Shimmering water from microbial mat 79°
C max. Temperature of bottom of mat with Hi-Temperature
Probe was 103° C.
15:09 Core # 5 taken (Alvin) in orange mat.
2378X, 847Y. Core was taken near a sulfide structure which
had Riftia a meter away.
15:14 Sipper #6 sample taken.
15:17 Moving on and saw purple worms at 2369X, 843Y.
Another sulfide structure observed at 2357X, 840Y.
15:20 Another sulfide structure observed at 2357X,
840Y. Looks top-heavy.
15:27 Triple Tower found via sonar. 2368X, 827Y.
15:30 Saw crabs on the peak, octopus nestled in a
cold area on the structure. Clams possible??
15:32 2394X, 799Y. Another sulfide structure.
15:33 Dropped weights.
16:46 On surface.
17:05 Alvin on deck.