Program and Agenda

Abstract

MAPPING THE MARINE MAGNETIC FIELD USING AUTONOMOUS MAGNETIC DRIFTERS

Marine magnetic data are critical for understanding ocean basin origin, evolution, and structure yet their density and availability are spatially biased with large gaps remaining in many regions (e.g., the Southern Ocean). We evaluate a new and cost effective approach using autonomous drifters to gather high-density magnetic data at sea. In 2012 we deployed five drifters off the U.S. West Coast, each consisting of one of two types of 3-axis magnetic sensor, GPS, iridium satellite modem, and battery housed within a modified oceanographic surface buoy. Each was programmed to log a 1 minute field average every 20 minutes, a calibration record once-a-day and temperature. Data were transmitted every 4 hours and tracked in quasi-real time. Drifter tracks, dictated by surface currents, exhibit eddy patterns and we observed surface current speeds of 0.1, 0.2, and 3.2 m/s at 25%, 50%, and 75% quantiles, respectively. Preliminary total field data show challenges in extracting the crustal field: (1) a large offset field due to battery and motion induced fields; (2) a calibration function is needed to correct for magnetic sensor temperature change.

ePoster: http://deeptow.whoi.edu/research/magdrifter.html

Authors

Chandler, M. T., Michigan State University, USA, mikec@msu.edu

Tominaga, M., Michigan State University, USA, tominaga@msu.edu

Sager, W. W., University of Houston, USA, wwsager@uh.edu

Tivey, M. A., Woods Hole Oceanographic Institution, USA, mtivey@whoi.edu

Fucile, P., Woods Hole Oceanographic Institution, USA, pfucile@whoi.edu

Details

Poster presentation

Session #:071
Date: 2/27/2014
Time: 16:00 - 18:00
Location: Poster/Exhibit Hall

Presentation is given by student: No

PosterID: 1683