Cruise Chronology from the Science Logbook

• 51759: Thursday, August 3, 2000

1600: depart UW School of Oceanography pier, Seattle

1740: exit Locks, transit to Elliot Bay for fuel

2300: depart fuel dock, transit to Port Angeles

• 51760: Friday, August 4

0700: stand-off Port Angeles, pick up Ko-ichi Nakamura via workboat

0800: transit to Endeavour Segment of Juan de Fuca Ridge, NE Pacific Ocean (UTM Section 9)

• 51761: Saturday, August 5

0141: 507446, 5310723, CTD Station (Stn) 1

Background cast ~10 km ENE of Main Endeavour Field (MEF)

0500: 506778, 5310500, Transit to CTD Stn 2

ABE preparation in progress...

0602: 502521, 5310734, CTD Stn 2

Background cast ~5 km ENE of MEF

1030: 492951, 5311154, CTD Stn 3

Encountered plume @ 2000m depth

1220: 492416, 5310857, CTD Stn 4

Assessing temperature profile south of MEF

1510: 492847, 5309780, Transit to CTD Stn 5

Moving from south to north end of MEF

1535: 493010, 5311204, CTD Stn 5

Vertical oscillating cast at station "NoMEF"

1837: 492430, 5309800, CTD Stn 6

Vertical oscillating cast (VOC) at station "SoMEF," encountered plume at ~45m above bottom

2252: 492503, 5309400, CTD Stn 7

Vertically oscillating tow (VOT) south of MEF searching for BulaBula source

2340, 492379, 5309444, end of CTD Stn 7

Ending CTD VOT to do ABE ballast test

• 51762: Sunday, August 6

0130: 491019, 5312058, ABE ops

Ballast test: Rod and Patrick swimming; Robert directing deck

0358: 492376, 5309440, CTD Stn 8

Continued search for BulaBula source between MEF and Mothra

1340: 497981, 5325752, CTD Stn 9

Searching for suspected source ~10km N of MEF, over Marv Lilley's target

2012: 492907, 5310740, CTD Stn 10

VOT back and forth along the northern boundary of the MEF "box"

• 51763: Monday, August 7

0446: 492651, 5310853, CTD Stn 11

Horizontal tow (HT) over known MEF sources, from N to S at ~2140m

0742: 492717, 5310210, CTD Stn 12

VOT along the southern boundary of the MEF "box"

1750: 492758, 5310860, ABE Dive 42 launch

• 51764: Tuesday, August 8

0450: 492714, 5310419, ABE 42 recovery

0602: 492757, 5310193, CTD Stn 13

VOT along the southern boundary of the MEF "box" during southerly predicted tidal flow. Hit buoyant plume and sampled. May have encountered diffuse flow?

1125: 492891, 5311324, CTD Stn 14

VOT ~500m N of MEF searching for 1995 instability source; wind speed increased.

1925: 492700, 5310910, CTD Stn 15

Transect of MEF (as in CTD Stn 11), but at 35-45 m above bottom

2200: 493425, 5307701, CTD Stn 16

Vertical cast in search of instability sourceon SE flank (Dynamic Postioning (DP) problems)

2350: 493500, 5308000, CTD on deck

Moving slowly towards an ABE launch (weather permitting)

• 51765: Wednesday, August 9

0600: 492898, 5310852, ABE Dive 43 launch

1530: ABE 43 recovery

1837: 494329, 5313474, CTD Stn 17 [bad]

Bad data. Instruments returned to deck to be checked

2211: 494343, 5313486, CTD Stn 17 [good]

VOT between High Rise and Salty Dawg in search of 1995 instability source

• 51766: Thursday, August 10

0752: 493641, 5314019, CTD Stn 18

VOT through Cirque and Dune diffuse flow vicinity

1535: 492719, 5310718, ABE Dive 44 launch

• 51767: Friday, August 11

0600: 493284, 5310692, ABE 44 recovery

0812: 495224, 5316162, CTD Stn 19

VOT north of Salty Dawg field, Marv's near north plume

1645: 492752, 5310361, ABE Dive 45 launch

On bottom at ~1845

• 51768: Saturday, August 12

0500: ABE 45 recovery

0610: 492713, 5310246, CTD Stn 20

VOT along E side of MEF box and then further E

1403: 492782, 5311094, (approx position) ABE Dive 46 launch

Arrived at start of 1st track line 0929 PDT; goal was 9:30!

1824: 492782, 5311094, (approx position) ABE 46 finished N side, start top

1730: ABE 46 finished top, start S side

• 51769: Sunday, August 13

0500: ABE 46 recovery

0545: 492487, 5310072, CTD Stn 21

VOT near bottom around Quebec diffuse flow site

0901: 492743, 5310185, CTD Stn 22-25

VOTs from Quebec, to SE flank (as in Stn 16), and back to Quebec

1929: 492488, 5310028, End CTD Stn 25

VOT #2 near bottom around Quebec diffuse flow site

• 51770: Monday, August 14

0153: 492717, 5310625, ABE Dive 47 launch

~16hr mission -- 2 times over the top of the MEF, at 75 m and 100 m elevations

2030: ABE 47 recovery

2321: 491875, 5312402, CTD Stn 26

VOT over W ridge crest

• 51771: Tuesday, August 15

0520: 491909, 5308045, CTD Stn 27

VOT SW of Mothra

0810: 492804, 5310884, ABE Dive 48 launch

~10hr mission -- 1 time over the top of the MEF at 75m

1945: 493674, 5309798, ABE 48 recovery

Great weather!

2057: 493006, 5311199, CTD Stn 28

VOC for 10hr ~500m N of MEF; storm inbound; pull for ABE launch ~0700 UTC

• 51772: Wednesday, August 16

0720: 492790, 5310862, ABE Dive 49 launch

Plan -- 1 time over top at 75 m elevation; bad weather approaching

1750: ABE 49 recovery

5 foot seas, winds ~15 knots

1900: 493281, 5314142, CTD Stn 29

VOT SW of Cirque and Dune (known diffuse flow sites)

2230: 493262, 5314142, (approximate position), Transit to ABE launch pt

Winds from 190 @ ~20 knots; cumulus cloud line visible to W aligned N-S

• 51773: Thursday, August 17

0125: 492787, 5310804, CTD Stn 30-31

2 HTs over N part of MEF (~50 m and ~80 m above bottom) with MAVS attached to CTD cage

1012: 492814, 5310803, CTD Stn 32

HT over N part of MEF (~70-90m above bottom) with MAVS; repeat of Stn 30 survey pattern; CTD on deck at 1612.

1723: 492984, 5310852, ABE Dive 50 launch

~28 hr mission (24 hr on bottom); 2 tops, all sides

• 51774: Friday, August 18

0240: 492247, 5309899, CTD Stn 33

Non-navigated VOC for 14hr ~500m SSW of MEF (with ABE in the water!)

1803: 492373, 5309896, recovered CTD Stn 33

2130: ABE 50 recovery

2300: 491633, 5307475, CTD Stn 34

VOT SW of Mothra

• 51775: Saturday, August 19

0715: 492808, 5310860, ABE Dive 51 launch

On bottom at 0915

1344: 492662, 5311024, CTD Stn 35

Non-navigated VOT around perimeter of MEF box between 1850 and 2070 m (perimeter ribbon #1)

1856: 492673, 5311023, CTD Stn 36

2nd MEF perimeter VOT

2255: 492890, 5310951, CTD Stn 37

3rd MEF perimeter VOT

• 51776: Sunday, August 20

0334: 492893, 5310950, CTD Stn 38

4th MEF perimeter VOT

0752: 492850, 5310964, CTD Stn 39

5th MEF perimeter VOT

1250: 492903, 5310949, CTD Stn 40

VOT across MEF field plume tops (1850-1980m)

1500: CTD on deck; beginning of styro-challenge...

1730: ABE 51 recovery

Ascent ~1 hr early due to battery discharge

1830: Styro-cast to 900m

1900: Begin transit to Seattle

• 51777: Monday, August 21

0030: 48d 27.5114m N, 125d 01.584m W, CTD cast

Bacterial water sampling cast at mouth of the Strait of Juan de Fuca

1800: Arrive Pier 66 - Elliot Bay, Seattle