Monterey Bay Aquarium Research Institute


Mike DeGrandpre , Ph.D.
University of Montana

Development of indicator-based chemical sensors for
ocean carbon cycle research

Wednesday – May 23, 2007
Pacific Forum – 3:00 p.m.

The seminar will focus on optical chemical sensors developed over the years by my research group. Successful development of an autonomous pCO2 sensor (SAMI-CO2) (DeGrandpre et al. 1995) led to use of the sensors for surface ocean carbon cycle studies (e.g. DeGrandpre et al. 1998, 2006) along with the design of other “spin-off” sensors for inorganic carbon cycle parameters (pH and total alkalinity) (Martz et al. 2003, 2006).  All of these sensors, which are really sensor-analyzer hybrids, utilize pH indicators and similar plumbing and optical designs.  I will present our strategies for maximizing signal-to-noise and long-term stability while minimizing power consumption and complexity (e.g. DeGrandpre et al. 1999).  A variety of in situ data sets will be presented to illustrate the capabilities and weaknesses of the technology.

Next: Craig Taylor, Ph.D.