59 research outputs found
Recommended from our members
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
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 1981. 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
Recommended from our members
Cold halocline, increased nutrients and higher chlorophyll off Oregon in 2002
Observed changes in the nutrient levels in the halocline of the California Current during 2002 indicated a natural eutrophication that was accompanied by increased chlorophyll and oxygen in surface water. Decreased oxygen in the lower water column over the shelf indicated that much of the phytoplankton production was respired rather than passed on to higher trophic levels. In 2002 the halocline water was >1ºC colder than usual and 0.5ºC colder than any previous observation. Four transect lines off the coast of Oregon show a 50% increase in nitrate, phosphate and silicate at 33 psu in 2002 compared to 1998–2001. The increase in nutrients resulted in a 2-fold increase in chlorophyll standing stocks during the summer of 2002 compared with the preceding four years. A significant portion of the increased production was subsequently respired resulting in low oxygen water over the shelf
Recommended from our members
Ancillary hydrographic data from the Coastal Ocean Dynamics Experiments : CODE-1 Legs 3 and 8 and CODE-2 LEGS 10 and 13
During some of the CODE mooring deployment and recovery cruises, CTD
observations were made on an ancillary basis. In conjunction with the recovery
of the CODE-2 array, CTD observations were made during 3-5 August
(CODE-2 Leg 10) and 19 August (CODE-2 Leg 13). The CTD observations were
made alongside current meter moorings and along the CODE Central section.
Maximum sampling depth was 505 m. This report includes vertical sections
and offshore profiles to summarize the Code Central line data, and vertical
plots and standard depth listings for each of the 31 stations.
Ancillary CTD observations were also made during 20-21 April 1981
(CODE-1 Leg 3) and 19 July 1981 (CODE-1 Leg 8). These CTD observations
were all made adjacent to the current meter mooring C-4 on the COC line.
Vertical profile plots and listings of the data at standard depth are
presented for these 17 stations
Recommended from our members
Hydrographic data from the first coastal ocean dynamics experiment : Leg 4, 25 April - 7 May 1981
CTD observations were made in the Code region near Pt Arena on the northern California coast at 39°N, off Purisima Pt. at 34°45'N and off Crescent City at 41°54'N, during 25 April - 7 May 1981. The observations in the Code region included four repeated sections along the Central Line, two mesoscale surveys of the shelf-slope region, and two alongshore sections. The maximum sampling depth was 1000 m. This data report includes vertical sections, mesoscale maps and offshore profiles to summarize the data, and vertical profile plots and listings of the data at standard depths for each of the 154 CTD stations
Recommended from our members
CTD observations off Oregon and California : R/V Wecoma, W8205A and Code 2 Leg 8, 18 May - 4 June 1982
CTD observations were made in the Code region near Pt. Arena on the
northern California coast at 39°N, off Coos Bay at 43°12'N, off Crescent
City at 41°54'N, of Eureka at 40°51'N, off Half Moon Bay at 37°25'N, off
Pt. Purisima at 34°45'N and in the Santa Barbara Channel during 18 May -
3 June 1982. The observations in the Code region were made along seven
sections: Irish Gulch, Arena, North, Code Central, Code-2 Central and Ross
lines and along the hundred fathom contour. Maximum sampling depth was
1000 m. This report includes vertical sections, mesoscale maps and offshore
profiles to summarize the data, and vertical profile plots and standard
depth listings for each of the 178 stations
Recommended from our members
CTD observations off Oregon and California : 5-17 February 1981
CTD observations of temperature and salinity were made off Oregon and California between 34° N and 44° N from the R/V Wecoma, 5 Feb. - 17 Feb. 1981. The stations were from 2-360 km off shore, in water depths ranging from 30 to 4,300 meters. The maximum sampling depth at most stations was about 1000 m, but at some of the offshore stations the casts extended nearly to the bottom. The stations were made along seven sections across the continental shelf and slope at 34°45'N, 36°10'N, 37°00'N, 38°40'N, 39°30'N, 41°54'N and 43°13'N. Three of these sections extended 360 km from shore. The data are summarized in vertical sections and offshore profiles of selected variables. Vertical profiles of temperature, salinity, and. sigma-theta, and listings of the data at standard depths are presented for each station. Near-bottom profiles of potential temperature, salinity and sigma-theta are shown for stations deeper than 2500 m
Recommended from our members
Hydrographic data from the first Coastal Ocean Dynamics Experiment : R/V Wecoma, Leg 7, 1-14 July 1981
CTD observations were made in the Code region near Pt. Arena on the northern California coast at 39°N, off Crescent City at 41°54 1 N, off Half Moon Bay at 37°25'N and off Pt. Purisima at 34°45'N during 2-13 July 1981. The observations in the Code region included three repeated sections along the Central Line, a mesoscale survey of the shelf slope region, and an alongshore section. The maximum sampling depth was 1000 m. This data report contains verticle sections, offshore survey maps, mesoscale maps and offshore profiles to summarize the data, and verticle profile plots and listings of the data at standard depths for each of the 141 CTD stations
Recommended from our members
Current measurements from moorings off Northern California, September 1984 - July 1985
Three deep-sea subsurface moorings, each equipped with five current meters at depths from 150m below the surface to 200m above the bottom, were deployed off Northern California from September 1984 to July 1985 as part of the OPTOMA program. The triad of moorings, centered near 38.5°N, 125°W, had mutual separations of 100 km. Velocity and temperature were recorded at hourly intervals; statistics and various plots of the data time series are presented in this report
Recommended from our members
CTD observations off Oregon and California : R/V Wecoma, W8201B, 28 January to 6 February 1982
Current meter moorings were recovered and deployed off of Coos Bay at 43°13'N, off of Crescent City at 41°54'N, off of Half Moon Bay at 37°25'N and off of Pt. Purisima at 34°45'N during 28-29 January 1982. CTD observations were made off of Coos Bay at 43°13 1 N, off Crescent City at 41°54'N, near Pt. Arena on the northern California coast at 39°N, off Half Moon Bay at 37°25'N and off Pt. Purisima at 34°45'N during 28 January -6 February 1982. The maximum sampling depth was 1000 m. This data report contains vertical sections and vertical profile plots and listings of the data at standard depths for each of the 45 CTD stations
Two coastal upwelling domains in the northern California Current system
A pair of hydrographic sections, one north and one south of Cape Blanco at 42.9N, was sampled in five summers (1998–2000 and 2002–2003). The NH line at 44.6N lies about 130 km south of the Columbia River, and spans a relatively wide shelf off Newport, Oregon. The CR line at 41.9N off Crescent City, California, lies 300 km farther south and spans a narrower shelf. Summer winds are predominantly southward in both locations but the southward winds are stronger on the CR line. Sampling included CTD/rosette casts (to measure temperature, salinity, dissolved oxygen, nutrients, chlorophyll), zooplankton net tows and continuous operation of an Acoustic Doppler Current Profiler. We summarize and compare July-August observations from the two locations. We find significant summer-season differences in the coastal upwelling domains north and south of Cape Blanco. Compared to the domain off Newport, the domain off Crescent City has a more saline, cooler, denser and thicker surface mixed layer, a wider coastal zone inshore of the upwelling front and jet, higher nutrient concentrations in the photic zone and higher phytoplankton biomass. The southward coastal jet lies near the coast (about 20–30 km offshore, over the shelf) on the NH line, but far from shore (about 120 km) on the CR line; a weak secondary jet lies near the shelf-break (35 km from shore) off Crescent City. Phytoplankton tend to be light-limited on the CR line and nutrient-limited on the NH line. Copepod biomass is high (15 mg C m−3) inshore of the mid-shelf on both NH and CR lines, and is also high in the core of the coastal jet off Crescent City. The CR line shows evidence of deep chlorophyll pockets that have been subducted from the surface layer. We attribute these significant differences to stronger mean southward wind stress over the southern domain, to strong small-scale wind stress curl in the lee of Cape Blanco, and to the reduced influence of the Columbia River discharge in this region
- …