NeMO Net

Welcome

Visit the latest NeMO Net site:
NeMO Net

NeMO Project

Vents Program

: A near-real-time system which links instruments located in the caldera of an active submarine volcano, 1 mile underwater and about 250 miles off Oregon's coast, to the Internet.

NeMO Net 2001 was deployed on July 27 with ROPOS. Instruments include 2 temperature probes and a Remote Access Sampler for obtaining chemical samples. The 2001 system stopped transmitting data on August 5 due to failure of the bottom-mounted acoustic modem. However, sampling should proceed weekly and data will be analyzed when the system is recovered in 2002.

Temperature data

Probe 1 | Probe 2 | All Data

Temperature was measured once an hour by both probes. Every 24 hours the resulting 72 temperature measurements were transmitted to the laboratory.

Tides were displayed for comparison.

Chemical sensors

Sampler system test deployment image

Click for larger version of this image of the sampler system in the laboratory

In July, 2001, a time-series sampler capable of collecting vent fluid and particles directly from a seafloor vent was installed. The core of this system is the McLane 48-500 Remote Access Sampler, with hardware and software enhancements done at PMEL. Measurements of pH and H2S will be monitored daily. The sampler will be programmed to take a water/particle sample once per week and collect chemical sensor data twice per week.

Background

NeMO Net 2000

NeMO Net 1999

is a breakthrough in ocean engineering utilizing an acoustic modem to relay data from three temperature probes and a camera to a moored buoy, which in turn send the data to NOAA's Pacific Marine Environmental Laboratory via a GOES satellite. The prototype system, operational for one month in 1999 was succeeded in July 2000 by a more advanced system. The new system uses an ORBCOMM satellite system to send and receive commands and data from shore to the seafloor.