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Hydrographic data from the GLOBEC long-term observation program off Oregon, 1999 and 2000 Public Deposited

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  • As part of the GLOBEC Northeast Pacific Program, a Long Term Observation Program (LTOP) of repeated hydrographic observations along lines off Oregon began in September 1997 (Fleischbein et al, 1999). Of these lines, NH, off Newport, had been sampled frequently during the decade from 1961 to 1970, and another, FM, off Coos Bay, had been sampled repeatedly in 1981-1983. During 1999 and 2000 the LTOP program continued sampling along these two lines and four additional lines off Oregon and California. The program includes measurements of upper ocean currents by the ship-borne Acoustic Doppler profiling system, zooplankton sampling at selected stations, and deployment of satellite-tracked drifters at selected sites; those results will be presented elsewhere. This report presents the CTD, nutrient and chlorophyll data from nine cruises made between February 1999 and September 2000. During the five 1999 cruises, sampling occurred on five separate lines (Figure 1): the Newport Hydro (NH) line which extends 150 km west along 44°39.1′N off Newport, Oregon; the Heceta Head (HH) line which extends 100 km west along 44°00′N off Heceta Head, Oregon; the Five Mile Point (FM) line which extends 65 km west along 43°13.0′N from Coos Bay, Oregon; the CR line which extends west along 41°54’N from Crescent City, California; and the EUR line which extends west along 40°52’N from Eureka, California. The Eureka line was discontinued at the end of 1999, and the Rogue River (RR) line, which extends west long 42°30'N from the Rogue River, Oregon, was added in 2000. Station names on each line reflect historical usage: for the NH line, the numerical suffix indicates the distance from shore in nautical miles; for all other lines, the station location names are those used during SuperCODE in 1981-1984 (Fleischbein et al., 1985). Each section includes at least two stations beyond the 1000 m isobath, and the maximum CTD sampling depth is 1000 m. The NH-line was sampled on nine cruises, and the FM line on six (Table 1,2). Four cruises included sampling on all five lines (Table 1,2). All of the cruises were on the R/V Wecoma, operated by Oregon State University, and sailed to and from her homeport of Newport, Oregon. The cruise name convention is as follows: the first letter designates the ship (W for Wecoma), the next four digits indicate the beginning year and month, and the final letter distinguishes between cruises starting in the same month (A for first, B for second, etc). Several persons participated in almost all cruises (Table 3). This overlap of personnel ensured that similar sampling protocols were used throughout; these protocols are described below.
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