Line P Program

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Map and list of stations

Map of Line P


Station Latitude N Longitude W Depth Station type
(see Present sampling)
P1 48°34.5 125°30.0 120 CTD
P2 48°36.0 126°00.0 114 Rosette/Bongo
P3 48°37.5 126°20.0 750 CTD
P4 48°39.0 126°40.0 1300 Rosette/Bongo
P5 48°41.5 127°10.0 2100 CTD
P6 48°44.6 127°40.0 2500 CTD
P7 48°46.6 128°10.0 2450 CTD
P8 48°49.0 128°40.0 2440 Rosette/Bongo
P9 48°51.4 129°10.0 2340 CTD
P10 48°53.6 129°40.0 2660 CTD
P11 48°56.0 130°10.0 2700 CTD
P12 48°58.2 130°40.0 3300 Rosette/Bongo
P13 49°02.6 131°40.0 2875 CTD
P14 49°07.4 132°40.0 3275 CTD
P15 49°12.0 133°40.0 3200 CTD
P16 49°17.0 134°40.0 3550 Rosette/Bongo
P17 49°21.0 135°40.0 3200 CTD
P18 49°26.0 136°40.0 3775 CTD
P19 49°30.0 137°40.0 3850 CTD
P20 49°34.0 138°40.0 3890 Rosette/Bongo
P21 49°38.0 139°40.0 3840 CTD
P22 49°42.0 140°40.0 3880 CTD
P23 49°46.0 141°40.0 3970 CTD
P24 49°50.2 142°40.0 3910 CTD
P25 50°00.0 143°36.3 3890 CTD
P35 50°00.0 144°18.2 4170 CTD
P26 50°00.0 145°00.0 4300 Rosette/Bongo/Mooring

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Present sampling

Our present sampling consists of the following:
Station type: CTD
A CTD cast is done to 2000 dbar. The standard CTD measurements are:
  • Temperature
  • Conductivity
  • Transmissivity
  • Fluorescence
  • Dissolved Oxygen
No water samples are taken except for a "Surface" sample at 5 dbar for Nutrients, Salinity, and Chlorophyll.
Station type: Rosette/Bongo
A "deep rosette" cast is done down to 10 m above the ocean floor. The CTD measurements listed above are recorded. In addition, water samples are taken for:
  • Dissolved Oxygen
  • Dissolved Inorganic Carbon
  • Alkalinity
  • pH
  • Nutrients (Nitrate plus Nitrite, Phosphate, Silicate)
  • Salinity
These samples are collected at the following pressures: 5, 10, 25, 50, 75, 100, 125, 150, 175, 200, 250, 300, 400, 600, 800, 1000, 1250, 1500, 2000, 2500, 3000, 3500, 4000 dbar and 10 m above the ocean floor.
A "shallow rosette" cast is done down to 200 dbar.

In addition to the CTD measurements listed above, Irradiance (PAR)is also recorded. Water samples are taken for:
  • DMS (Dimethylsulfide)
  • DMSP-d (Dimethylsulfoniopropionate dissolved)
  • DMSP-t (Dimethylsulfoniopropionate total)
  • Nutrients (Nitrate plus Nitrite, Phosphate, Silicate)
  • Chlorophyll
  • HPLC (Phytoplankton Pigment Concentrations)
These samples are collected at the following pressures: 0, 5, 10, 15, 20, 25, 30, 40, 50, 75, 100, 175, 200, 300 dbar.
A vertical net haul is performed down to 250 m using a set of Bongos with a mesh size of 236 μm.

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