Monterey Bay Aquarium Research Institute

Paull Fluid Flow Cruise
October 2 - October 8, 2000
Monterey Bay
Cruise Description


Purpose

The primary objective is to dive in lower Monterey canyon to investigate the location, sources, and mechanisms that control fluid flow. Secondary objectives include dynamics of the canyon floor, stratigraphy and structure of the canyon flanks, and the penetration of pesticides into the canyon. 

Equipment Description

The ROV should be equipped with push cores (12-16 per dive, 24+ onboard), scoop-bags (6 per dive), heat flow probe with the hydraulic inserter, two Niskin bottles and four peepers. The peepers will be mounted onto Tiburon’s the swing-arm in a bucket that Hans is preparing to allow them to have minimum oxygen exposure before the dive. We will want to have 5 long life homers available for to mark the peeper deployment sites. Some of the peepers will be picked up during a dive series of Greene, Barry and Jannasch (Oct 30- Nov. 7). We also wish to have ~25 simple disposable visual markers that can be more accurately mark the thermal measurement sites. Since thermal measurements are an important objective on some of these dives, we request that both of the MBARI heat flow probes be onboard. The clathrate bucket may be used on some dives. The pore water van needs to be onboard.

At night we will be sampling with our small gravity corer. Thus, the wire rope should be on the hydro-winch. We will determine if there is a grab sampler available.

Participants

Charlie Paull (Co-Chief), Hans Jannasch (Co-Chief), Bill Ussler, Norm Maher, Josh Plant, Patrick Mitts, Aroon Melwani (MLML), Jenny Paduan, Shana Goffredi, Verena Tunnicliffe (MBARI visiting scientist), Judy Donaldson.

Planned Transit

Oct. 2. Dive at Extravert Cliff (36.7755° N 122.0868’W in 970 m water depth). There is a Homer (#36) that is already here. On this dive we will want to switch out this homer. The main objective of this dive will be to conduct 16+ thermal gradient measurements using the hydraulically inserted heat flow probe. These measurements will consists of several couples of measurements made inside and outside seeps, as well as along a short (<1 km) transect along the ridge crest. At each thermal measurement site will want to put out a simple marker so that we can subsequently re-occupy the area. 

Oct. 3 Dive at 36° 34.22987' N, 122° 11.19528' W in 2432 m water and proceed up the northern flanks of the canyon.

Oct. 4. Dive at 36° 36.07013' N, 122° 18.45043' W in 2701m and proceed up the northern flank of canyon.

Oct. 5, 6 and 7.Will either conduct other vertical transects up the canyon flanks or horizontal transects along contours near the top of Smooth Ridge. The location of these dives will be determined on the basis of the first three dives.

Oct. 8. Proceed to ~36° 37.52062' N, 122° 08.78500' W , which is ~39 km from Moss Landing. Dive at a site in axis of canyon in ~2246 m and proceed up the northern flank of the canyon. At night conduct sediment sampling along transect across Smooth Ridge.

 

Click on the links to the left to find out more about this exciting cruise!