OCEANOGRAPHY. School of OREGON STATE UNIVERSITY. bec t3 196

Size: px

Start display at page:

Download "OCEANOGRAPHY. School of OREGON STATE UNIVERSITY. bec t3 196"

Ronald Simmons
5 years ago
Views:

School of bec t3 196 LABRARY MARINE SCIENCE CENTEI, OREGON STATE UNIVERSF.

West Coast Shelf Experiment and The Low Level Waste Ocean Disposal Program:

UNIVERSITY Jane Fleischbein Adriena Huyer Data Report 96 Reference 82-9

1 School of bec t3 196 LABRARY MARINE SCIENCE CENTEI, OREGON STATE UNIVERSF. _ NEWPORT, OREGON OCEANOGRAPHY // Hydrographic Data From A Large Scale West Coast Shelf Experiment and The Low Level Waste Ocean Disposal Program: R/V Wecoma, Cruise W8108B, 24 August - 6 September 1981 by OREGON STATE UNIVERSITY Jane Fleischbein Adriena Huyer Data Report 96 Reference 82-9 October 1982 National Science Foundation OCE Sandia Labs Contract SAN

2 School of Oceanography Oregon State University Corvallis, OR Hydrographic Data From A Large Scale West Coast Shelf Experiment and The Low Level Waste Ocean Disposal Program: R/V Wecoma, Cruise W8108 B, 24 August - 6 September 1981 by Jane Fleischbein Adriana Huyer Data Report 96 Reference 82-9 October 1982 National Science Foundation OCE Sandia Labs Contract SAN

3 TABLE OF CONTENTS Abstract List of Tables and Figures Introduction Sampling Procedures, Calibration and Data Processing 5 Data Presentation 8 Vertical Sections 11 Mesoscale Maps 19 Vertical Profiles and Listings 31 Top 1000 db Profiles for Deep Stations 47 Near Bottom Profiles for Deep Stations 55 Acknowledgments 62 References 62

4 ABSTRACT CTD observations were made near Coos Bay at 43 08'N, off Crescent City at 41 54'N and in the vicinity of the LLWODP Pacific Study Area W-N west of Cape Mendocino between 24 August and 6 September The maximum sampling depth was 4405 db. This data report includes vertical sections, mesoscale maps, and vertical profile plots and listings at standard depths for each of the 29 CTD stations.

5 LIST OF TABLES AND FIGURES Table. List of CTD stations occupied during W8108 B, showing date and time, location, atmospheric pressure, wind speed and direction. Table 2. characteristics of the CTD probe used. Table 3. Summary of the comparisons between the Neil Brown CTD probe and in situ calibration data. Figure 1. Location of stations off Coos Bay and Crescent City. Figure 2. Location of stations in the Pacific Study Area W-N.

6 1 INTRODUCTION Cruise W8108B was split into two legs involving two different projects. The purpose of Leg 1 was to complete 2 CTD sections off Coos Bay and Crescent City as part of the hydrographic survey of the ongoing Large Scale West Coast Shelf Experiment (J. S. Allen, A. Huyer and R. L. Smith, principal investigators). Leg 2 of Cruise W8108B was one of a series of cruises, of the Low Level Waste Ocean Disposal Program (G. R. Heath) to study the deep circulation and sea floor characteristics at Pacific Study Area W-N. A complete discussion of the operations and a cruise narrative for Leg 2 was reported by Pillsbury and Heath (1982). This report presents only the final CTD data. The R/V Wecoma departed Newport on August 24, Two sections off Coos Bay and off Crescent City (Figure 1) were completed on August 1981 for a total of 17 CTD casts on Leg 1 (Table 1). Sampling was done to a maximum depth of 1000 db at the offshore stations. The ship arrived in Eureka at 1830 PDT August 26 and departed at 2000 PDT the same day after exchanging personnel. Between August 28 and September 3,12 CTD casts were completed in the vicinity of the Pacific N-W Study Area (Figure 2), west of Cape Mendocino, California. The maximum sampling depth for each of the 12 stations was greater than 4000 db. The cruise ended at Newport, Oregon on September 6, Personnel participating in the CTD data collection were Jane Fleischbein and Rich Schramm (Leg 1) and Dennis Barstow and Henry Schaechterle (Leg 2).

7 Table 1. List of CTD stations occupied during W8108B, showing date and time, location, atmospheric pressure, and wind speed and direction. STATION NO. NAME LOCATION Lat. Long. PRESSURE Dir WIND Spd August 25, August 26, August 28, August 29, August 31, August 1, August 2, August 3, 0724z CB-1 CB-2 CB-3 CB-4 CB-5 CB-6 CB-7 CB-8 CR-9 CR-8 CR-7 CR-6 CR-5 CR-4 CR-3 CR-2 CR-1 A B C D E F G H J K L M 'N 'W mb T Airs Airs kts kn

8 IIIIIIIITIIIIIII Coos Bay 43 N W8108B CTD Stations Aug Crescent City ,Lidmikii niiiimhimili,h mimilm., miliflimun, 125 W 124 Figure 1. Location of stations off Coos Bay and Crescent City, August 1981.

9 CRUISE W8108B STATIONS 21 i CMMW im CMMW C2-2 all 11 1 ' CMMW-8 28 Figure 2. Location of current-meter moorings (triangles), corrosion frames (square) and CTD stations (circles) occupied on cruise W8108B. The indicated bottom contours are uncertain in some regions: at a few CTD stations (e.g. Station 20) the observed bottom depth differed significantly from the depths inferred from this map.

10 5 SAMPLING PROCEDURES, CALIBRATION AND DATA PROCESSING A Neil Brown Instruments Mark IIIb conductivity-temperature depth probe (CTD) was used to obtain continuous profiles of temperature and salinity versus pressure at each station. Characteristics of the CTD probe are presented in Table 2. Sampling procedures were identical with those described by Fleischbein et al. (1981). Probe #2561 with a 6500 db pressure sensor rating was used for all stations. The CTD probe was calibrated for pressure, temperature and conductivity by the manufacturer prior to delivery in the fall of in situ calibration data were also collected for temperature and conductivity sensors. A Niskin bottle equipped with 3 protected reversing thermometers was mounted about 2 m above the CTD sensors to provide calibration samples. The thermometers have an accuracy of ±0.02 C and are corrected using the results of calibrations done once every 2 years. Water sample salinity is determined by Guildline Model 8400 Autosal salinometers with precision of better than ±0.002 /00 and accuracy of ±0.003 /00, using equations given by Bennett (1976). CTD data are recorded at the actual sample depth after the bottle is tripped. Occasionally due to large wire angles the CTD and sample bottles do not remain at the same depth (and temperature) during soak time. When this resulted in relatively large differences between the sample and CTD temperature readings, these points were eliminated from the overall CTDsample comarisons. Triplicate salinity samples were drawn from the Niskin bottle at each station. Two complete sets of samples and 13 samples from the third set were analyzed on OSU's Autosal #1. The remaining 16 samples from the third

11 6 set were analyzed on NOAA's Autosal #3 to check the results of Autosal #1, which had been having some noise problems at the time. A set of NOAA substandard water on Autosal #3 showed it to be operating within specifications. The differences between the sample salinities run on Autosal #1 and #3 had a mean of and a standard deviation of which is within the precision of the Autosals. Therefore the results of Autosal #1 were determined to be accurate and were used in the CTD calibration. Results of the comparison between in situ sample data and the CTD output are summarized in Table 3. The sample conductivity was calculated using the CTD temperature and sample salinity. CTD conductivity was corrected for the pressure and temperature effects on the cell prior to the comparison. The temperature differences are within the sampling and instrument errors so no further corrections were applied to temperature prior to processing the data. The conductivity differences had a mean offset of and the correction was added to the CTD conductivity prior to processing. The procedures for data processing were described by Gilbert, Huyer and Schram (1981). The coefficient (a) for the conductivity filter for the CTD probe used (#2561) was Stations 12 and 26 showed a sudden jump in conductivity probably due to detritus in the cell and were edited during processing. Editing involved linear interpolation of processed salinity at db for Station 12 and at db for Station 26.

12 Probe Sample Interval Table 2. Characteristics of the CTD probe used. Sensors Temperature Time Constant P T C ms 280 ms Range: 6500db -2 to 30 C 1 to 65 mmhos Resolution: 0.1db.0005 C.005 mmhos Accuracy: ±6.5db ±.005 C ±.001 mmhos Table 3. Summary of the comparisons between the Neil Brown CTD probe and in situ calibration data. CTD No. Temperature it( C) Conductivity, Salinity AS (700) AC (mmhos an-1) N mean s.d. N mean s.d. N mean s.d

13 8 DATA PRESENTATION The hydrographic data are summarized in vertical sections, maps and offshore profiles. For the two CTD sections, we show the vertical distribution of temperature, salinity, and sigma-theta, contoured by hand. Tick marks at the top of each section indicate station positions at which a CTD cast was made, and an inverted "T" marks the maximum depth of each cast. For the Pacific Study Area W-N survey we show mesoscale maps of potential temperature, salinity, sigma-theta and dynamic height at selected depths. The distributions have been contoured by hand. Vertical profiles of temperature, salinity and sigma-theta vs. pressure are shown for each station. Header information for each station is as follows: STA NO Consecutive station number. STATION The CTD section name (initialed) and number of the station on the line (Refer to Figures 1 and 2). LAT Latitude in degrees and minutes north of the equator. LONG Longitude in degrees and minutes west of Greenwich. DATE Day/Month/Year. TIME Time in Greenwich Mean Time. PROBE CTO probe number. DEPTH Sonic depth in meters, corrected according to Matthews Tables appearing in the Handbook of Oceanographic Tables, U.S. Naval Oceanographic Office Publication SP-68 (1966). The data listing for each station gives values at standard pressures including observed and calculated parameters at the shallowest and deepest observations levels. Temperature (TEMP), salinity (SAL), potential

14 9 temperature (POTEN TEMP), sigma-theta (SIGMA THETA), specific volume anomaly x 10 5 (SVA) and dynamic height (DELD) in dynamic meters are given for each pressure (PRESS) in decibars. Computed parameters are calculated from the complete data array. The near bottom profiles of potential temperature, salinity and sigmatheta vs. depth are also presented for each of the deep stations; for these profiles, the bottom depth is indicated by a solid line.

16 Temperature ( C) -400 Coos Bay (along N) 25 Aug KM FROM SHORE 0

17 Salinity (%0) -400 Coos Bay (along ' N) 25 Aug // KM FROM SHORE -600

18 B., ca Sigma - e -400 Coos Bay (along ' N) 25 Aug / KM FROM SHORE

19 E a_ 400 Temperature ( C) Crescent City (along '1\1) Aug / 50 KM FROM SHORE 0 600

20 16 STATION NO II _1_1_0.-- I E āw 400 Salinity (%0) Crescent City (along 'N) Aug KM FROM SHORE 0 600

21 STATION NO L,,,._-, , , Z: , =7./ E a_ w 2 6 9N. \ / \.. N. / Sigma - A... / Crescent City / (along N) Aug KM FROM SHORE

23 ......:,/ \, i32 >32.8 `------' G32.8 S ( /01 0 db \ I Sigma - 9 O db 28 Aug - 3 Sept 81 `

24 I ' I ( C) 1000 db / S (Y00) 1000 db 2738 Sigma - e 1000 db 28 Aug - 3 Sept

25 Z90 Z90 8 ( C) 2000 db S (%0) 2000 db 1." / / 2769 Sigma db Aug - 3 Sept , I

26 I Z58 A ( C) 2500 db , 9 S (%o) 2500 db Sigma db 28 Aug - 3 Sept

27 I 40 /40 / \ /.40 ( C) 3000 db S ( /00) 3000 db \ \ , / Sigma A 3000 db I Aug 3. Sept 81 I

28 ( C) 3500 db I S ( /00) 3500 db Sigma db 28 Aug - 3 Sept 81 I I /

29 ' I 127 ` /8 e ( C) 4000 db / 1/ S (%.) 4000 db. I /2 129 Sigma db 28 Aug - 3 Sept 81. I , I

30 / LD (dyn cm) 28 Aug - 3 Sept 81. I.. I I' A DC/ Aug - I,

31 i ' A D (dyn cm) 28 Aug - 3 Sept 81 r 4, D (dyn cm) 28. Aug - 3 Sept

32 / ; 46' D (dyn cm) 28 Aug - 3 Sept 81 / I, A D 2000/4000 (dyn cm) 28 Aug - 3 Sept

33 ok' S 452 A D2500/3500 (dyn cm) 28 Aug - 3 Sept / ' 1 ' t / 4'46 AD 3000/4000 (dyn cm) 28 Aug - 3 Sept is 4 (446 \ ' \ ) p 450 /

35 SG. SAL. STA NO 1,c11.-1 LAT: N LONG: AUG GMT PRODC 2541 DEPTH 5IM 4.7 KM FROM SHORE PRESS TEMP SAL POTEN SIGMA SVA DELO TEMP THETA : ,5 SIGMA-) 28. 5, 27..5, SALINITY STATION 1 CB STA NO 2 1G8-2 LAT: N LONG: W 25 AUG GMT rrocc 2561 DEPTH KM FROM SHORE PRESS TEMP SAL POTEN SIGMA SVA DELD TEMP' THETA es 0 1,a 5 2 U r. 175 SIG SIGMA , SALINITY STATION 2 CB2

36 33 TEMPERATURE STA NO LAT: N LONG: W 25 AUG GMT PRODE 2561 DEPTH 111M 14.6 KM FROM SHORE SIG I TEMP SAL. PRESS TEMP SAL POTEN SIGMA SVA DELD TEMP THETA SIGMA SALINITY STATION 3 CB3 0 0 STA NO 4.C8-4 LAT: N 25 AUG 1981 LONG: GMT W PRODC DEPTH KM FROM SHORE 150M PRESS TEMP SAL POTEN SIGMA SVA DELD TEMP THETA ? CO SIG. TEMP SAL SIGMA SALINITY STATION 4 CB4

37 34 16 STA NO 5 rcb-5 LAT: N LONG: W 25 AUG GMT PROBE 2561 DEPTH 252M 26.7 KM FROM SHORE PRESS TEMP SAL POTEN SIGMA SVA DELO TEMP THETA ' SALINITY STATION 5 CBS STA NO 6.CD-6 LAT: N LONG: W 25 AUG GMT PROBE 2561 DEPTH 272M 33.6 KM FROM SHORE PRESS TEMP SAL POTEN SIGMA SVA DELD TEMP THETA ? "

38 35 0 STA NO 7.C11-7 LAT: N LONG: W 25 AUG GMT PRODS 2561 DEPTH 1034M 4;.4 NM FROM SHORE PRESS TEMP SAL POTEN SIGMA SVA DELD TEMP THETA TEMPERATURE 4 8 ' ""'" STA NO 8.CB-0 LAT: N LONG: W 25 AUG GMT PRODE 2561 DEPTH 1604M 60.6 KM FROM SHORE PRESS TEMP SAL POTEN SIGMA SVA DELD TEMP THETA / S STATION 8 CB8

39 ((MP STA NO 9.CR-9 LAT: N LONG: W 25 AUG GMT PROBE' 2561 DEPTH 3194M 92.9 KM FROM SHORE PRESS TEMP SAL POTEN SIGMA OVA DELO TEMP THETA ? STATION 9 CR9 STA NO 10 fcr-8 LAT: N LONG: W 25 AUG GMT PRODE 2561 DEPTH 2677M 81.9 KM FROM SHORE PRESS TEMP SAL POTEN SIGMA SVA DELI! TEMP THETA ?

40 37 4 TEMPERATURE 8 STA NO 11.CR-7 LAT: N LONG: AUG GMT PROBE 2561 DEPTH 65.2 NM FROM SHORE 0.1 W 019M PRESS TEMP SAL POTEN SIGMA SVA DELD TEMP THETA BO SALINITY STATION 11 CR7 TEMPERATURE STA NO 12.CR-6 LAT: N LONG:I W 26 AUG GMT rroec 2561 DEPTI1 607M 48.4 KM FROM SHORE LIN INT SAL PRESS TEMP SAL POTEN SIGMA SVA DELD TEMP THETA , , Z , S ^ al a W M D 0 W M SIGMA SALINITY STATION 12 CR6

41 STA NO 13 T ER-5 LAT: N LONG:I W 26 AUG GMT PROBE 2561 DEPTH 652M 41.3 NM FROM SHORE PRESS TEMP SAL POTEN SIGMA OVA GELD TEMP THETA ? SIGMA S SALINITY STATION 13 CRS 16 STA NO 14 ror-4 LAT: N LONG: W 26 AUG ? GMT PROBE 2561 BUTH 5M 31.7 KM FROM SHORE PRESS TEMP SAL. POUR TFMP SIGMA TNETA OVA DELD TEMP

42 STA NO 15 PER-3 LAT: N LONG: W 26 AUG GMT PROBE 2561 DEPTH 116M 23.1 KM FROM SHORE 75 SIG. SAL. PRESS TEMP SAL POTEN SIGMA SVA DELD TEMP THETA W SIGNA-g SALINITY STATION 15 CR3 STA NO 16.CR-2 LAT: N LONG: W 26 AUG GMT PROBE 2561 DEPTH 67M 15.2 KM FROM SHORE PRESS TEMP SAL. POTEN SIGMA SVA DELD TEMP THETA ,

43 STA NO 17,CR-1 LAT: t N LONG: W 26 AUG GMT PROSE 2561 DEPTH KM FROM SHORE PRESS TEMP SAL POTEN SIGMA OVA DELD TEMP THETA ' STA NO 18,A LAT: 27.0 N LONG: AUG GMT PROSE 2561 DEPTH 4219M KM FROM SHORE PRESS TEMP SAL POTEN SIGMA OVA DELD TEMP THETA A ? ? ? TEMPERATURE S SIGMA SALINTIY STATION 18 A

44 41 TEMPERATURE I S 9 STA NO 17 7B LAT: N LONG: W AUG GMT PROBE 2561 DEPTH 4200M KM FROM SHORE 3150 TEMP SALINTIY STATION 19 B PRESS TEMP SAL POTEN SIGMA SVA DELD TEMP THETA ' ' ' TEMPERATURE STA NO 20 7C LAT: N LONG: W 29 AUG GMT PRODS 2561 DEPTH 4071 M KM FROM SHORE PRESS TEMP SAL POTEN SIGMA SVA DELD TEMP THETA CY to ta SIGMA SALINTIY STATION 20 C

45 TEnP TEMPERATURE STA NO 21 ID LAT: 20.9 N LONG: W 29 AUG GMT PRUDE KM FROM SHORE 2561 DEPTH 4227,: PRESS TEMP SAL. POTEN TEMP SIGMA SVA DELD THETA , BOO ' STA NO 22.E LAT: H LONG: W 31 AUG GMT mon 2361 DEPTH 4310M KM FROM SHORE PRESS TEMP SAL POTEN SIGMA SVA DELD TEMP THETA ? ' ? : tj cc a TEMPERATURE STATION 22 E

46 STA NO 23 LAT: 20.0 N LONG: W 31 AUG GMT rronc 2561 DEPTH KM FROM SHORE SIGMA SALINTIY STATION PRESS TEMP SAL POTEN SIGMA OVA DELD TEMP THETA ? ? A STA NO 24.0 LAT: 17.0 N LONG: W 31 AUG GMT PRUDE 2561 DEPTH 4187 M KM FROM SHORE PRESS TEMP SAL POTEN SIGMA OVA DUD TEMP THETA , ? , SIGMA STATION 24 G

47 44 TEMPERATURE STA NO 25.H LAT: 5.0 N LONG: W 31 AUG GMT rrode 2561 DEPTH 4219 M KM FROM SHORE TEMP SIGMA S SALINTIY STATION STA NO 26 LAT: N LONG: W 1 SEP GMT PROBE 2561 DEPTH 4292M KM FROM SHORE LIN INT SAL PRESS TEMP SAL POTEN STOMA OVA DELD TEMP THETA r E TEMPERATURE PRESS TEMP SAL POTEN SIGMA OVA DELD TEMP THETA E TEMP SIGMA SALINTIY STATION

48 STA NO 27.K LAT N LONG: W 2 SEP GMT PRODS 2561 DEPTH KM FROM SHORE SALINTIY STATION 27 K PRESS TEMP SAL POTEN SIGMA SVA DELD TEMP THETA ? STA NO 28 LA T1 8.0 N LONG: W 2 SEP GMT PROBE 2861 DEPTH 4341 M KM FROM SHORE PRESS TEMP SAL POTEN SIGMA SVA DELD TEMP THETA n ' STATION 28 L 34.75

49 46 M STA NO 29.M LAT: 17.0 N LONG: W 3 SEP GMT PROBE 2561 DEPTH 4336M KM FROM SHORE PRESS TEMP SAL POTEN SIGMA OVA DELD TEMP TNETA

OCEANOGRAPHY. chool of OREGON STATE UNIVERSITY E55:: r 'r En, by Jane Fleischbein William E. Gilbert Adrlana Huyer Richard Schramm.

OCEANOGRAPHY. chool of OREGON STATE UNIVERSITY E55:: r 'r En, by Jane Fleischbein William E. Gilbert Adrlana Huyer Richard Schramm. ti E55:: 't chool of APRp 1,983 r 'r En, OCEANOGRAPHY // Hydrographic Data from the Second Coastal Damn Dynamics Experiment: R/V Weems, Leg 0, 26 February -1 March 1982 by Jane Fleischbein William E. Gilbert