January 9, 2001 To: Sid Stillwaugh, NODC From: Sharon Walker, PMEL Re: Data submission Per our conversation I am providing you with 2 copies (PC compatible CD) of CTD data collected by the VENTS program during the 1985-2001 time period. All files, with a few exceptions, are plain ASCII text files with data columns labeled. A few data files are either Excel (file type .xls) or Kaleidagraph (file type .qda) formats. Some comments may be included in Word (.doc) files within certain directories. Data is organized by cruise, with a separate folder for each cruise. Below is a list summarizing the cruises. The CTD data acquired by the VENTS program includes both vertical profiles and tow-yo's. All data files are presented in a time-averaged format. For earlier cruises, data for tows were generally averaged in 15-sec time bins, vertical profiles in 10-sec time bins. For more recent cruises, all data are averaged in 5-sec time bins. Time (UTC as hh:mm:ss) is always in the first column and is the central time for that time bin. All files include the following variables: Time Pressure (db) Depth (m) Temperature (oC) Conductivity (Siemens/m) Salinity (PSU) Theta (oC) Sigma-Theta (kg/m3) Altitude (m) Data products specific to VENTS are optical measurements and the derived variable temperature anomaly (or Delta-Theta). Optical measurements were made with one of several types of transmissometers or Light Back Scattering Sensors (LBSS). Data is reported as light attenuation, attenuation anomaly, voltage, NTU (Nephelometric Turbidity Units) or dNTU (an anomaly value of NTU). Temperature anomaly (Delta-Theta), is an estimate of additional temperature due to hydrothermal input and is derived from a relationship between potential temperature (Theta) and potential density (Sigma-Theta). For each profile or tow where Delta-Theta was calculated, the specific relationship used is included in the first few lines of each file. Tow data files also include Latitude, Longitude and cumulative distance along the tow in additional columns. Station locations are available in summarized, tabular form in some of the directories (mostly later ones). Study areas are generally identified in the cruise summary list below. More detailed information for all cruises is available, but not tabulated in a convenient form for transmittal with these files. This information would, however, be readily available if there were a specific request for it. Some of this data has been submitted previously either by Dave Pashinski or myself. I am including all data here, even if previously submitted, for convenience, completeness and perhaps redundancy since the media used for previous submissions may not be accessible anymore. Please do not hesitate to contact me if you need additional information or if requests for this data are received. Originating Lab: Pacific Marine Environmental Laboratory 7600 Sand Point Way NE, Bldg#3 Seattle, WA 98115 Project: VENTS Time: 1985 - 2001 Contact: Sharon Walker OR Ed Baker address as above address as above (206)526-6788 (206)526-6251 walker@pmel.noaa.gov baker@pmel.noaa.gov Cruise (folder name) Cruise Dates Ship Name Operating Area #vertical profiles #tows Vents85 June 1985 Surveyor NE Pacific/JDFR 23 7 Vents86 Aug-Sept 1986 Discoverer NE Pacific/JDFR 25 9 Vents87 Sept 1987 Discoverer NE Pacific/JDFR 18 14 Vents88 Sept 1988 Discoverer NE Pacific/JDFR 58 12 Vents89 Aug 1989 Discoverer NE Pacific/JDFR 63 11 Vents90-leg1 July 1990 Discoverer NE Pacific/JDFR 21 4 Vents90-leg4 Sept 1990 Discoverer NE Pacific/JDFR 27 8 Vents91-A2 Aug 1991 Atlantis II NE Pacific/JDFR 3 5 Vents91-EPR Nov 1991 New Horizon ERP/9-11oN 38 18 Vents91-leg2 June 1991 Discoverer NE Pacific/JDFR 48 15 Vents92 May-June 1992 Discoverer NE Pacific/JDFR 88 15 Vents93-A2 Oct 1993 Atlantis II NE Pacific/JDFR 2 14 Vents93-EPR Nov-Dec 1993 Melville NE Pacific/JDFR 31 7 Vents93-leg1 June 1993 Discoverer NE Pacific/JDFR 33 9 Vents93-leg2 July-Aug 1993 Discoverer NE Pacific/JDFR 5 13 Vents93-leg3 Aug 1993 Discoverer NE Pacific/JDFR 4 5 Vents94-A2 June-July 1994 Atlantis II NE Pacific/JDFR 10 8 Vents94-leg1 Jul-Aug 1994 Discoverer NE Pacific/JDFR 9 19 Vents94-leg3A Sept 1994 Discoverer NE Pacific/JDFR 14 3 Vents94-Surveyor April 1994 Surveyor NE Pacific/JDFR 18 6 Vents95-A2 Aug 1995 Atlantis II NE Pacific/ 'Bare' outcrop sites 16 12 Vents95-leg1 June 1995 Discoverer NE Pacific/JDFR 21 15 Vents96-leg1 June 1996 Discoverer NE Pacific/ JDFR, Gorda 13 20 Vents96-McArthur March 1996 McArthur NE Pacific/Gorda 14 none Vents96-Wecoma April 1996 Wecoma NE Pacific/Gorda 12 6 Vents97-RBleg2 Sept-Oct 1997 RH Brown NE Pacific/JDFR 38 9 Vents98A-Melville March-April 1998 Melville SEPR/27-32oS 34 11 Vents98B-RBleg1 July-Aug 1998 RH Brown NE Pacific/JDFR 29 21 Vents98C-RBleg2B Aug-Sept 1998 RH Brown NE Pacific/JDFR 11 2 Vents98D-Atlantis Dec 1998 - Jan 1999 Atlantis SEPR/4-32oS 11 7 Vents98-Wecoma-AxialResponse Feb 1998 Wecoma NE Pacific/Axial 16 none Vents99A-Tangaroa March 1999 Tangaroa SW Pacific/ Kermadec Arc 64 13 Vents99B-Wecoma June 1999 Wecoma NE Pacific/JDFR 23 12 Vents2000A-Franklin May 1999 Franklin SW Pacific/ Solomon Islands *not PMEL data Vents2000B-RBleg3 July-Aug 2000 RH Brown NE Pacific/JDFR 39 16 Vents2001-NewHorizon-GordaResponse April 2001 New Horizon NE Pacific/Gorda 25 none Vents2001-Wecoma July-Aug 2001 Wecoma NE Pacific/JDFR 44 14 JDFR = Juan de Fuca Ridge, includes Cleft, N.Cleft, Axial, CoAxial, Vance and Endeavour segments, generally located between 44.25-48.0oN, 129.0-130.75oW. Some cruises also acquired samples in the Blanco Fracture Zone (generally located 40.5-44.25 oN, 127.5-129.0 oW). Axial = Axial Volcano, located on the Juan de Fuca Ridge at about 46.0 oN, 130.0 oW Gorda = Gorda Ridge, generally located 40.5-43. 0oN, 126.5-127.5oW EPR = East Pacific Rise, latitudes of study areas indicated SEPR = Southern East Pacific Rise, latitudes of study areas indicated NODC Platform Codes 1) Discoverer - 31DS 2) Surveyor - 31SU 3) Atlantis II - 31AN 4) Melville - 318M 5) New Horizon - 32NM 6) Ron Brown - 33RO 7) Wecoma - 32WC 8) Franklin - 09FA 9) Tangaroa - 0999 Institute - 313F Project - 0222 File Alias 1) CTD - L303 2) Towed CTD - L301