The Cross Shelf Project January 1977–April 1977

The Cross Shelf Project was sponsored by the United States Department of Energy Contract EY-76-S-06-2225 TA25 to Drs. B. Hickey & J. Dungan Smith at the University of Washington. The purpose of this project was to determine the cross-shelf structure of currents off the Washington coast during winter and spring. In particular, an attempt was made to determine the shape and vertical structure of the coastal jet, the time scale of its variability and the cross-shelf variation in current fluctuations.

The University of Washington maintained 3 current meter moorings, CR1, CR2, and CR3, from Jan. 8, 1977 through April 15, 1977 along a line off Westport, Washington. Current meters were a mix of Braincon (BR) and Aanderaa (AA) instruments. Speed and direction were measured, then resolved into u and v components. Some meters had temperature sensors. Data was sampled in 20 (all AA curent meters, BR at CR1 25m) or 40 minute intervals (all remaining BR current meters), edited for spurious values then filtered to reduce high frequency noise and decimated to hourly values. In some cases data was interpolated to even hours to produce the hourly data below. Temperature data was left in 20 minute samples and all 4 series show periods of possible range limits.

Abbreviations and units are:
Depth, m, meters,
Speed, spd, cm/sec,
Direction, D, degrees, true north,
u component (eastward), u, v component (northward), v, cm/sec, true North,
Temperature, T, ºC,
Pressure,  P, decibars,
Date and time is listed as LDATE to indicate time base is local, (+8), Pacific time zone. Add 8 hours to convert to GMT. Format: mm/dd/yy hh:mm.

Data files consist of ASCII tab delimited files. Headers indicate the mooring, the deployment, variable, and depth rounded to the nearest meter. For example CR1u26 indicates the data is from the CR1 mooring, u component at 26m, CR3T80 indicates the data is from the CR3 mooring, temperature data at 80m. The last column, JJ, is zero filled to indicate last data column for that meter.

Mooring: Cross Shelf 1 (CR1)                                       Position: 46º51.6'N, 124º20.5'W
Bottom depth: 50m
Deployed: 0947 (+8) Jan. 8, 1977 by R/V T.G. Thompson
Cruise: TT112
Recovered: Released 1350 (+8) April 15, 1977; Array found floating in the deployed area 1630 (+8) April 16, 1977 and recovered by the R/V T.G. Thompson
Cruise: TT116

Actual Depth Variables Instrument type, Comments
25
T
 AA, Temperature only, sample interval 20 minutes, some samples appear to be range limited.
26
u,v
 BR, Data record ended early.
40
u,v
 BR, Film jammed, ending data record early.

 

Mooring: Cross Shelf 2 (CR2)                                       Position: 46º49.5'N, 124º32.5'W
Bottom depth: 100m
Deployed: 1249 (+8) Jan. 8, 1977 by R/V T.G. Thompson
Cruise: TT112
Recovered: Released 0900 (+8) April 15, 1977; Array recovered April 19, 1977, S.S.W. of Columbia Lightship in 90m.
Cruise: TT116

Actual Depth Variables Comments
25
u,v
 AA
25
T
 AA, Temperature only, sample interval 20 minutes, some samples appear to be range limited.
40
u,v
 BR, Data record ended early. Time base lost due to splice in film about 2 days after start, zero filled 1810 01/10/77 to 1610 01/13/77 and 0410 01/16/77 to 0810 01/17/77.
80
u,v
 AA
80
T
 AA, Temperature only, sample interval 20 minutes, some samples appear to be range limited.

 

Mooring: Cross Shelf 3 (CR3)                                       Position: 46º47.0'N, 124º47.6'W
Bottom depth: 160m
Deployed: 1506 (+8) Jan. 8, 1977 by R/V T.G. Thompson
Cruise: TT112
Recovered: 0545 (+8) April 15, 1977 by R/V T.G. Thompson
Cruise: TT116

Actual Depth Variables Instrument type and Comments
25
 AA, Lost at sea.

40
u,v
 BR
80
u,v
 AA
80
T
 AA, Temperature only, sample interval 20 minutes, some samples appear to be range limited.
140
u,v
 BR


Last updated Sept. 17, 2013.