Shelf-Basin Interactions (SBI) Summer
Cruise 2004: HLY-04-03-Final Cruise Summary and Report (18 July to 26 August
2004) Edited by Lee Cooper, Chief Scientist (send comments to lcooper1@utk.edu)
The
summer 2004 SBI process cruise provided for a complex interdisciplinary
research opportunity through use of the scientific icebreaker USCGC Healy
between 18 July and 26 August 2004 by a large and diverse group of scientists.
The Shelf-Basin Interactions program is the most complex interdisciplinary
research program ever mounted from a US Coast Guard icebreaker, with up to 51
shipboard science party members on each cruise engaged in interdisciplinary
research, including microbiology, primary production, optics, water column and
benthic biology, tracer and nutrient chemistry, physical oceanography and
educational outreach, all in the context of understanding environmental change
in the Arctic. In addition to mooring and survey cruises that were also
undertaken during the SBI field program, this specific research cruise, one of
a total of four process experimental deployments that were undertaken in 2002
and 2004, was by all measures an outstanding success. The four experimental
cruises undertaken in 2002 and 2004 posed great logistical and scientific
challenges. Of these four cruises, this cruise occupied the most stations (60),
obtained the deepest water and sediments from the most northern portions of the
study area, and deployed the most diverse set of equipment. Approximately 180
CTD casts were made to support the scientific work, and a wide variety of
oceanographic gear, including the rosette, three corers, grabs, varied nets,
traps, video and optics instrumentation were deployed over the side of the ship
a sum total of approximately 600 times over the 40-day cruise.
Helicopter-supported sampling of the Colville River delta, numerous small boat
operations in support of experimental floating sediment trap deployments and
two successful search and rescue operations were some of the other
accomplishments. Public outreach was accommodated for a broadcast group from
the science unit of the News Hour with Jim Lehrer and a senior correspondent
from U.S. News and World Report. A science teacher from Newman Catholic High School in Wausau, Wisconsin provided a daily posted
web-based journal with photographs that was made available for Internet-based
viewing and was incorporated into a well-developed cruise web site developed
and maintained by the Joint Office for Science Support (JOSS) of the University
Corporation for Atmospheric Research. Finally, a community observer from
Barrow participated in the scientific work onboard and will communicate back to
the local community about his experience through a report to the Barrow Arctic
Science Consortium. The objectives of the community observer program are to
help explain the scientific goals of individual research projects such as SBI
to the nearby communities as well as to convey community interests in Arctic
research priorities to scientific researchers working in this region. We also
accommodated a radio interview and ship tour for the news department of KNOM-AM
in Nome.
Almost all of the planned scientific stations were occupied,
although several stations that were planned for sampling in the Herald Valley
region near the International Dateline were ultimately not occupied because of
other priorities that were identified by SBI investigators. This work included
deep-water sampling in the Canada Basin and high-resolution surveys in several
of the slope regions. We note that while sampling at these Herald Valley
stations could have been completed based upon the original ship time request of
42 days, the 40 days that were supported by the National Science Foundation
allowed all major research objectives to be achieved. In addition, the areas
near the Herald Valley moorings will be sampled for many parameters during the
HLY04-04 mooring cruise deployment that immediately followed this deployment.
Furthermore several SBI principal investigators were represented on the
NOAA-supported RUSALCA cruise aboard the Professor Khromov that was
simultaneous with HLY-04-03. This cruise sampled waters, sediments and
organisms from the Russian Exclusive Economic Zone, including the critical
Herald Canyon outflow zone for Bering Sea waters that is to the north and west
of the SBI study area. These other sampling opportunities will presumably
provide data and insights that were not obtained on HLY04-03 because of time
constraints.
It is a great pleasure as chief scientist to express appreciation
on the behalf of the science party to a great number of individuals and
organizations that helped assure the success of the scientific program of Healy
04-03. The marine science technician group on the Healy, MSTC Don Snider, MST2
Dan Gaona, MST2 Josh Robinson, MST3 Chad Klinsteker and MST2 Eric Rocklage,
together in coordination with the ship science officer, LTJG Jessica Noel,
worked long hours to successfully and safely deploy all of the equipment that
was used during the cruise. LCDR Daryl Peloquin, XO Bill Rall, and Captain Dan
Oliver were among the members of the entire officer group that were helpful and
pro-active in helping us meet our cruise objectives. The aviation detachment,
led LCDR Mark Fluitt, provided outstanding support of a number of science
objectives and logistical transfers. We also thank in general the entire crew
of the ship for their outstanding efforts throughout the research program in
every component of ship operation. Andy Heiberg provided crucial logistical
support in Seattle at the time that the ship was loaded, and in Nome at the
time of both science party embarkation and disembarkation, as well as
contributing to logistical efforts needed in Nome for the NOAA-supported
RUSALCA cruise. The Barrow Arctic Science Consortium, particularly Henry Gueco
and Glenn Sheehan, provided critical logistical assistance with personnel and
equipment transfers, including assisting late at night during a medical
emergency, and they also facilitated the participation of our community
observer, Jimmy Jones Olemaun aboard the ship. The Armada Project (www.armadaproject.org) enabled our
teacher, Stephen Schmidt of Newman Catholic High School of Wasau, Wisconsin to
participate in the cruise, and the National Science Foundation and the Office
of Naval Research provided the core financial support for the science party.
Stations
occupied during the cruise included a transect in Bering Strait (station
prefix: BRS-) for limited water column measurements, a high productivity
station north of Bering Strait (HV-1), sampling in Alaska Coastal Water enroute
to Barrow (station prefix: ACW-), high-resolution (5 km spacing) sampling on
two cross-Barrow Canyon lines, a transect in Barrow Canyon offshore to 3700 m
(station prefix: BC-), and we also completed sampling along a shelf-deep basin
transect east of Barrow (station prefix: EB-), also to a depth of 3700 m. The latter portion of the cruise completed
work on two offshore transects on the Chukchi Shelf into the deep (3700 m)
basin (EHS- and WHS- ). The following summaries correspond to the
accomplishments of the individual research programs on the ship, as provided to
the chief scientist by each research group. More detailed information on all
shipboard work, actual locations sampled, instrumentation deployed and the
timing associated with these scientific operations is posted JOSS/SBI web page
(http://www.joss.ucar.edu/sbi/catalog_hly-04-03/). Additional information on the SBI program in
general are available at http://sbi.utk.edu
1.
Hydrographic Measurements Team: Lou Codispoti lead (on board); Jim Swift, lead
PI
Other
team members: Kristin Sanborn, Robert Palomares, Dan Schuller, Erik Quiroz
Observations:
During
this SBI process cruise we completed 60 stations and 184 CTD casts. The data
have been edited and posted on the JOSS web site, and we have had time to plot
data from our sections in Bering Strait and Barrow Canyon and the East Barrow
line. Our observations include
continuous vertical profiles of temperature, salinity, dissolved oxygen,
fluorometric “chlorophyll”, light transmission, Haardt fluorescence (an index
of terrestrial organic matter), and photosynthetically available radiation
(PAR). Discrete water samples collected
from our 30 liter rosette bottles have been analyzed for salinity, dissolved
oxygen, ammonium, nitrate, nitrite, urea, phosphate, silicate, chlorophyll and
phaeophytin concentrations, and members of the hydrographic team performed
nutrient analyses for several of the experiments that were conducted.
Results:
Perhaps
the most notable finding of the hydrographic team on this cruise was the rather
dramatic warming of waters in the SBI region compared to the conditions that we
encountered during the summer 2002 cruise (Healy 02-03). For example, data from
our easternmost section (Fig. 1) display a dramatic warming between the 2002
and 2004 summer cruises during the same time of the year (late July – early
August). The salinities of the warm water, and the silicate and phosphate
concentrations suggest that these waters had their origin in Bering Strait, so
it is likely that there was a strong inflow of warm water through Bering Strait
this year, although the waters that we observed on our easternmost section
would have experienced some modification as they made the transit from Bering
Strait. Satellite data processed by our
SBI colleagues support the hypothesis of a strong influence of warm water from
Bering Strait. We also encountered some very high dissolved oxygen
concentrations (> 15 ml/l) in subsurface chlorophyll maxima in the Barrow
Canyon region.
With
the exception of the afore-mentioned features and greatly reduced ice cover,
many of the gross hydrographic features that we observed in summer 2004 were
similar to those encountered in summer 2002 during Healy cruise 02-03. For example, our 2002 and 2004 two visits to
the east line showed almost the same subsurface structure: nutrient maxima were
present in the halocline, but were not connected to the shelf as they were in
our other sections taken in 2002 and 2004, and there appeared to be a “doming”
in the center of the section during both years. As in 2002, subsurface
chlorophyll maxima were ubiquitous during this cruise being found at depths of
~25 m over the shelf and deepening to ~ 50 m in the clearer offshore
waters. Although, we have yet to
confirm this, we have the preliminary notion that the offshore chlorophyll
maxima at about 50 m were deeper than in 2002, perhaps because the reduction in
ice cover permitted increased light penetration in 2004. As in 2002, nitrate and ammonium depletion
in the surface waters was widespread, as were nutrient plumes coming off the
shelf into the interior of the Arctic on all sections except for the
easternmost section.
Of
additional interest was a well-developed front that we observed in our transect
that crossed Barrow Canyon near its head.
For example, there were strong temperature gradients with the warmest
water on the coastal side of this transect, and this was in line with the
satellite images shown to us by our colleagues.
The
hard work, dedication and skill of the other members of the hydrographic team,
Dean Stockwell, Rob Palomares, Dan Schuller, and Rebekah Duncan are also deeply
appreciated. We also appreciate the
efforts of Berit Rabe and Craig Aumack who voluntarily manned the CTD console
when we required extra assistance.
Respectfully
submitted: L.A. Codispoti and K.
Sanborn
2.
Acoustic Doppler Current Profiler Data Collection: Berit Rabe (on-board);
Andreas Müenchow, lead PI
Introduction
The USCGC Healy has two independent
Acoustic Doppler Current Profilers (ADCP) mounted in the hull of the ship: an
Ocean Surveyor 75 kHz phased-array system (OS75) and a Broadband 153 kHz
discrete-array system (BB153). Both systems were up and running, but the BB153
system was still being vetted to ascertain its data collection reliability. The
OS75 is functioning in both broadband and narrowband mode. Both systems
integrate acoustic data with the ship’s gyro, the aft P-code Trimble Centurion
GPS and the Ashtech attitude GPS data. All data were collected onto local
computers and then transferred to the networks archiving computer (snap1) and
to a Mac PowerBook G4 for both systems.
Changes in comparison to the HLY04-02
spring cruise occurred in the form that the data was transferred automatically
to the snap1 server with the program VVScheduler once a day instead of
manually. The OS75 was also operated in dual-ping mode most of the cruise
instead of just single-ping mode.
Data collection
Both systems were run via VmDas under
Windows-2000 Professional which controls input and output data streams. VmDas
receives
- Single- (or dual-) ping data via serial port COM7 (.ENR
file on output)
- Gyro heading data via serial port COM7 (.ENR file on
output)
- P-code (aft) GPS data via serial port COM8/9 (8 on
BB153 and 8 on OS75 until 08/02/2004 ~1930 UTC afterwards COM9,
see elog entries) (.N1R file on output)
- Ashtech navigational and attitude data via serial port
COM8/9 (9 on BB153 and 9 on OS75 until 08/02/2004 ~1930 UTC
afterwards COM8, see elog entries) (.N2R file on output)
The aft P-code GPS system is distinct from the bridge P-code GPS system. VmDas generates 10 different output files that merge and average data from the three input streams in varying ways. A .LOG file contains both direct commands send to the instrument on start-up as well as subsequent error messages. The most frequent error messages were
[date, time]:
NMEA [RPH] communication timeout
indicating that VmDas does not receive
the Ashtech data or
[date, time]:
NMEA [RPH] serial buffer full: storing 300 bytes without processing.
[date, time]:
NMEA [RPH] serial buffer level ok.
[date, time]:
NMEA [Nav] serial buffer full: storing 300 bytes without processing.
[date, time]:
NMEA [Nav] serial buffer level ok.
which occurred rather at random or when
data was copied to a USB stick. The error
[date, time]:
ADCP timeout; check communication and power cables.
occurred frequently (most of the time
on the BB153) but didn’t seem to have an effect on the data collection though.
The setup for the BB153 and the OS75
were as following:
The BB153 was setup to collect 50
6-meter bins with blanking of 4 meters. Bottom track was set to 800 or 1000
meters or was adjusted to the actual bottom depth, but was turned off in waters
deeper than 1000 meters.
The OS75 has different data collection
setups depending on the changing bathymetry. The blanking was kept at 10 meters
at all times. Bottom track was turned on for areas shallower than 1000 meters,
and was also adjusted to the bathymetry (in shallow waters on the shelf the
maximum bottom track depth was set to 100 meters for example).
Broadband and narrowband can operate
with different bin sizes and numbers:
In shallow water on the shelf these
values are 15 4-meters bins for the Broadband and 8 8-meter bins for the
Narrowband plus bottom track.
In the beginning of the cruise
interleaved broad- and narrowband pings were not used in waters deeper than 160
meters instead only the narrowband ping was used (with 30 15-meter bins or 55
8-meter bins, depending on whether being on station, steaming over the shelf
break, etc).
In
the middle of the cruise (when heading to the shelf break and into the basin on
the East Barrow line on 07/30/2004) interleaved pinging was tested in deeper
water with 20 4-meter bins for the Broadband and 30 15-meters bins for the
Narrowband. The reason is to get a higher resolution in the upper layers but
also a deeper penetration. Until that point of time both ADCPs didn’t reach the
expected depth. The interleaved pinging was kept on for the rest of the cruise
because it worked well and the results were good. Nevertheless the
water-tracking range was still reduced and didn’t reach further than about 300
meters. This will cause some further investigation to find the reasons for this
reduction.
Performance
Both ADCPs continuously collected data
with some trouble in between. The main error messages were already explained in
the previous section. Once a day the machines were rebooted as an insurance
against data loss because the Windows system doesn’t run as stable as needed.
In comparison to previous cruises we encountered much less ice, so periods with
actually breaking ice were short which resulted in a continuous data collection
without heavy vibrations of the ship.
The OS75 had some serious
hardware/software trouble in the middle of the cruise when not recognizing all COM-Ports
from one day to the next. Three days in a row some adjustments and work had to
be done after rebooting before the COM-Ports showed up again (see elog
entries). The trouble appeared in connection with a Lava Quattro Card and with
a serial mouse that doesn’t exist. We changed the Lava Quattro Card and
modified the boot.ini file in c:\. Except that the COM-Port numbers for the two
navigation ports switched, the system was running from then on (see elog
entries). COM-Ports were checked in BBTalk every day after rebooting. On two
days a second serial mouse appeared next to the disabled one, and one COM-Port
was missing, but after shutting down the machine again (in one case once in the
other case five times) and checking again in BBTalk, all COM-Ports showed up
and the second serial mouse was gone.
Some system shut downs occurred on the
OS75 as well as on the BB153 without an obvious reason, but after rebooting
data collection could be continued.
In
the first half of the cruise the water profiling range of the OS75 didn’t reach
as far down as expected. The instruments water tracking range of 600 meters is
reduced anyway because of the acoustic window below the instrument but was as
low as 225 meters at some points at the beginning of the cruise depending on
the presence of signal scatterers in the water column. After changing to
interleaved pinging also in deeper waters this changed and the OS75 reached
down to about 300 meters in narrowband mode which is still less than we would
expect.
In addition, the shallow seas on the Chukchi Shelf
limit the access of the ADCPs because of the deep draft of the ship (8.4
meters) and the data blanking that is preset with these instruments, 10 meters
for the OS75 and 4 meters for the B153. With vertical bin sizes between 4 meter
for the broadband and 8 meter for the narrowband the first data is obtained
below 22 meters which limit the data return when the depth of the shelf is only
40 to 50 meters.
Besides
the reduced depth penetration the data that is collected is very clear.
For a better and more reliable
performance the OS75 machine desperately needs a replacement or needs to be
rebuilt. It has to be moved from the ground to a rack. On the ground it
receives all the vibrations of the ship which caused the failure with the board
which literally fell out of the case when opening it. Besides the moving of the
machine it has trouble with the COM-Ports (see elog-entries) and something
needs to be done to solve that problem with the COM-Ports and serial mice. In
the long-term a change to a more stabile system would be helpful without the
need to reboot the machine every day to avoid data loss.
Data processing
and interpretation
Data
is collected onto the local machines and once a day transferred automatically
to the archive system with VVScheduler and also manually to a Mac PowerBook G4
(via the snap server) for data processing. This is done in real time using
University of Delaware software specifically written and designed for the
HLY04-03 cruise. In the first half of the cruise the software just processed
the narrowband ping for the OS75. New extended software of the previous one
processing the broadband ping as well as the narrowband ping at the same time
was implemented.
Processed data was presented as maps or
time series for the science crew on the ship.
In Bering Strait we
observed a strong northward flow as expected with velocities higher than
60 cm/sec.
In Barrow Canyon a strong
northeastward flow with velocities higher than 60 cm/sec occurred along the
isobaths. In 325 meters at station BC4 the flow was split apart with one
component flowing northeast and the other flowing west. In 960 meters at BC5
the main flow in the upper layers is weak (<20 cm/sec) to the
south-southwest and at station BC6 at the end of the canyon in 2000 meter depth
a west northwestward flow with higher velocities was measured.
On the East Barrow section
signal return over the basin wasn’t good as a result of lack of scatterers in
the water column. Working together with Sharon Smith’s Zooplankton
Distribution and Abundance group special plots were made for specific stations
and sections. That way we were looking for a connection between the currents
and special abundance of zooplankton in special depth layers. The water-tracking depth was reduced even more than it was
anyway. This low signal return correlates with little plankton in the basin.
Overall there is very
little noise in the data. Therefore semi-diurnal tidal currents as well as a
diurnal inequality can be discerned each with amplitude of about 5 cm/s. Since
these signals are usually not this visible, the collected data seems to be
rather good.
Processed
ASCII data was also transferred to Andreas Muenchow, the lead PI, at the
University of Delaware on a day-to-day basis. The ascii data files and data
products were posted every day and are accessible at http://newark.cms.udel.edu/~sbi/hly0403/index.html
which can be reached via http://newark.cms.udel.edu/~sbi.
Appendix
System diagnostic test:
The following list shows the results of
the built-in system diagnostic tests that were run for the OS75. This test
measures the receive bandwidth of the system. A beam fails if the bandwidth is
less than 75%. We would want to reach the expected receive bandwidth number,
except for beam number 3 this was not the case.
Given are the date, time, station
number, depth at that station, the expected bandwidth and the received bandwidth
for the four different beams.
date time station# depth[m] exp.bw Bm1 Bm2 Bm3 Bm4
04/07/29 17:03:03.13 25 52 7750 4398
4095 6801 5882
04/07/30 17:11:56.62 28 142 7750 4208
3795 6922 5721
04/07/31 19:07:58.28
29/30 270 7750 4350
4000 6811
5646
04/08/01 08:24:56.53 30 3850 7750 4320
3902 6769 5747
04/08/01 20:25:09.86 30 3810 7750 4229
3837 6884 5732
04/08/04 19:52:51.65 32 2124 7750 4387
4028 6797 5834
04/08/05 10:40:57.12 33 925 7750 4386
4069 6970 5745
04/08/05 22:03:49.73 33 925 7750 4704
4530 6710 5701
04/08/07 05:17:43.05 35 1914 7750 4553
4303 6812
5754
04/08/07 20:06:18.10 35 1914 7500 4487
4233 6785 5720
04/08/08 11:22:41.44 36 2905 7750 2899
2768 4194 4005
04/08/09 18:18:28.82 37 3761 7750 4551
4273 6819 5578
04/08/10 19:38:11.87 38 49 7750 4285
4041 7006 5531
04/08/12 22:10:28.26 46 298 7500 4429
4050 6983 5912
04/08/14 16:22:45.83 48 1077 7750 4583
4280 6890 5716
04/08/15 20:19:11.86 49 1938 7750 4551
4290 6897 5600
04/08/16 23:19:42.73 51 3668 7750 4302
3921 6801 5816
04/08/17 17:54:08.66 51 3668 7750 4347
3988 6803 5735
04/08/18 19:34:31.32 52 3760 7750 4525
4262 6918 5578
04/08/19 18:46:43.52 54 2110 7750 4486
4178 6817 5586
04/08/20 20:59:09.33 55 1135 7750 4227
3804 6888 5715
04/08/21 16:24:04.08 55 1135 7750 4369
3975 6854 5771
04/08/22 19:26:42.46 57/58
250 7750 4394
4119 6603 5538
04/08/24 01:48:21.93 60 52 7750 4570
4357 6965 5706
List of files:
All files have
the convention to start with hly04-03-osxxx_yyyyyy.zzz (or
HLY04-03-bxxx_yyyyyy.zzz) where xxx are numerical file designation for a single
configuration that may consist of yyyyyy separate files. zzz is the file
extension, e.g. ENR for single-ping raw, N1R for P-code GPS, and N2R for
Ashtech GPS data. For processing purposes the file number was kept in sequence
although raw data file numbers go from 001 to 071 which includes empty files
caused by the COM-Port troubles and the automatic setting to advance to the
next file number. In the list the file number, the ensemble numbers, start and
end date, time and position and the hours of the data collection in that file
are given. All times are UTC, longitudes are in decimal degrees West and
latitudes are in decimal degrees North.
OS75:
start of file end of file
file# #ens
date time lat
lon date time lat
lon hrs
010 26308
| 719 5:14
64.56 166.67 |
719 19:51 65.70 168.71 | 14.6
011 35893
| 719 20:41 65.71
168.76 | 720 16:37
67.36 168.90 | 19.9
012 45083
| 720 16:43 67.36
168.90 | 721 17:45
69.95 164.41 | 25.0
013 28746
| 721 17:51 69.95
164.41 | 722 16:35
71.07 159.43 | 22.7
014 29412
| 722 16:41 71.07
159.43 | 723 15:55
71.45 157.19 | 23.2
015 24033 |
723 16:00 71.45 157.18 |
724 11:03 71.58 155.62 | 19.1
016 52293
| 724 11:07 71.58
155.62 | 725 16:38
71.92 154.90 | 29.5
017 19754
| 725 16:48 71.93
154.90 | 726 16:22
71.93 154.82 | 23.6
018 24261
| 726 16:27 71.93
154.82 | 727 18:54
72.01 154.69 | 26.4
019 5542 | 727 19:02 72.01 154.70 | 727 22:10 71.99 154.79
| 3.1
020 3024
| 727 22:11 71.99
154.79 | 727 23:52
71.97 155.09 | 1.7
021 16992
| 727 23:55 71.97
155.09 | 728 15:56
72.29 154.28 | 16.0
022 13789
| 728 16:02 72.29
154.29 | 728 23:42
71.64 153.15 | 7.7
023 3287 |
728 23:43 71.64 153.15 |
729 2:20 71.29 152.68 |
2.6
024 21543
| 729 2:21 71.29
152.67 | 729 16:57 71.31 152.57 | 14.6
025 35455
| 729 17:05 71.31
152.56 | 730 17:06
71.54 152.42 | 24.0
026 19791 | 730 17:16 71.54 152.42 | 731 16:55 71.61 152.41
| 23.7
027 10921
| 731 19:11 71.58
152.41 | 801 8:23
72.59 151.91 | 13.2
028 14064
| 801 8:27 72.59
151.91 | 801
20:20 72.51 152.17 | 11.9
029 24239
| 801 21:44 72.50
152.20 | 802 18:13
72.42 152.05 | 20.5
030 31943
| 802 19:52 72.42
152.08 | 803 22:54
71.98 152.13 | 27.0
031 31943
| 802 19:52 72.42
152.08 | 804
19:48 0.00 0.00 | 47.9
032 31943
| 802 19:52 72.42
152.08 | 805
10:28 0.00 0.00 | 62.6
033 13305
| 805 10:43 71.71
152.18 | 805 21:59
71.64 152.22 | 11.3
034 22293
| 805 22:07 71.64
152.22 | 807 5:13 72.18
153.93 | 31.1
035 17375
| 807 5:20 72.17 153.93 | 807
20:02 72.14 154.12 | 14.7
036 17738
| 807 20:09 72.14
154.13 | 808 11:10
72.48 153.39 | 15.0
037 36413
| 808 11:26 72.47
153.40 | 809 18:14
72.77 152.84 | 30.8
038 27615
| 809 18:21 72.77
152.84 | 810 17:42
72.20 159.11 | 23.3
039 2458 |
810 17:48 72.19 159.11 |
810 19:10 72.18 159.08 | 1.4
040 18261 | 810 19:41 72.17 159.08 | 811 5:50 72.56
158.79 | 10.1
041 18194
| 811 5:52 72.56
158.79 | 811
18:11 72.63 158.43 | 12.3
042 28511 | 811 18:18 72.62 158.43 | 812 22:06 72.78 158.36
| 27.8
043 14934
| 812 22:13 72.78
158.36 | 813 18:28
72.79 158.38 | 20.2
044 32851
| 814 16:27 72.90
158.40 | 815 20:14
72.99 158.22 | 27.8
046 31760
| 815 20:22 72.99
158.22 | 816 23:15
73.80 156.73 | 26.9
047 21839
| 816 23:22 73.80
156.73 | 817 17:50
73.78 156.78 | 18.5
048 29852
| 817 17:58 73.78
156.78 | 818 19:11
73.93 157.84 | 25.2
049 27222
| 818 19:38 73.93
157.83 | 819 18:39
73.52 159.50 | 23.0
050 30856 | 819 18:49 73.52 159.50 | 820 20:55 73.29 160.07
| 26.1
051 15977
| 820 21:03 73.29
160.07 | 821 16:19
73.29 160.18 | 19.3
052 19436
| 821 16:27 73.29
160.19 | 822 19:08
73.15 160.43 | 26.7
053 9244 |
822 19:29 73.12 160.47 |
823 5:56 73.10 160.50 | 10.4
054 25169 | 823 6:00 73.10 160.50 | 824 1:44 72.74 161.30 | 19.7
BB153:
start of file end of file
file# #ens
date time lat
lon date time lat
lon hrs
000 20921 | 719 4:55 64.57 166.65 | 719 20:18 65.70 168.69 | 15.4
001 27211
| 719 20:27 65.70
168.72 | 720 16:29
67.37 168.90 | 20.0
002 33280
| 720 16:35 67.36
168.90 | 721 17:03
69.95 164.41 | 24.5
002 33280
| 720 16:35 67.36
168.90 | 721 17:03
69.95 164.41 | 24.5
003 31746
| 721 17:08 69.95
164.41 | 722 16:26
71.07 159.44 | 23.3
004 31693
| 722 16:32 71.07
159.44 | 723 15:49
71.45 157.19 | 23.3
005 25969
| 723 15:54 71.45
157.19 | 724 11:02
71.58 155.63 | 19.1
006 53536
| 724 11:05 71.58
155.62 | 725 16:52
71.93 154.90 | 29.8
007 37077
| 725 16:58 71.93
154.89 | 726 16:17
71.93 154.82 | 23.3
008 44478
| 726 16:21 71.93
154.82 | 727 18:44
72.01 154.69 | 26.4
009 38104
| 727 18:49 72.01
154.69 | 728 16:03
72.29 154.29 | 21.2
010 13483
| 728 16:08 72.29
154.30 | 728 23:38
71.66 153.17 | 7.5
011 23048
| 728 23:39 71.65
153.17 | 729 16:35
71.31 152.57 | 16.9
012 33288
| 729 16:54 71.31
152.57 | 730 17:20
71.55 152.42 | 24.4
013 37857
| 730 17:25 71.55
152.42 | 731 21:47
71.72 152.24 | 28.4
014 40079
| 731 21:52 71.73
152.23 | 801 20:14
72.51 152.17 | 22.4
015 39225
| 801 20:19 72.51
152.17 | 802 18:07
72.42 152.05 | 21.8
016 51887
| 802 18:12 72.42
152.05 | 803 23:07
71.98 152.13 | 28.9
017 37229
| 803 23:10 71.98
152.13 | 804 19:56
71.97 152.21 | 20.8
018 46003
| 804 20:02 71.97
152.21 | 805 21:42
71.64 152.21 | 25.7
019 52236
| 805 21:47 71.64
152.21 | 807 5:04 72.18 153.92 | 31.3
020 26426 | 807 5:11 72.18 153.93 | 807 19:57 72.14 154.12 | 14.8
021 27197
| 807 20:02 72.14
154.12 | 808 11:10
72.48 153.39 | 15.1
022 54832
| 808 11:33 72.47
153.41 | 809 18:03
72.77 152.85 | 30.5
023 42452
| 809 18:12 72.77
152.84 | 810 17:49
72.19 159.11 | 23.6
024 33327
| 810 17:52 72.19
159.11 | 811 18:20
72.62 158.43 | 24.5
025 34600
| 811 18:24 72.62
158.43 | 812 19:50
72.75 158.44 | 25.4
026 27755
| 812 19:54 72.75
158.44 | 813 18:21
72.79 158.38 | 22.5
027 28795
| 813 18:26 72.79
158.38 | 814 16:09
72.91 158.40 | 21.7
028 49967 | 814 16:16 72.91 158.40 | 815 20:07 72.99 158.22
| 27.9
029 48807 |
815 20:13 72.99 158.22 |
816 23:25 73.80 156.73 | 27.2
030 32750
| 816 23:30 73.80
156.73 | 817 17:43
73.78 156.78 | 18.2
031 46408
| 817 17:49 73.78
156.78 | 818 19:39
73.93 157.83 | 25.8
032 40992
| 818 19:46 73.92
157.82 | 819 18:33
73.52 159.50 | 22.8
033 47021
| 819 18:38 73.52
159.50 | 820 20:47
73.29 160.08 | 26.2
034 34152
| 820 20:54 73.29
160.07 | 821 16:14
73.29 160.18 | 19.3
035 43964
| 821 16:19 73.29
160.18 | 822 19:00
73.15 160.42 | 26.7
036 29671 | 822 19:07 73.15 160.43 | 823 16:58 73.06 160.86
| 21.9
Elog entries for OS75 and BB153:
The following is a copy of the elog entries for the ADCP75 and the ADCP150, mostly concerning errors and malfunctions that were documented for this cruise.