EDUCATION

B.S. Biology with Honors Trinity University, San Antonio, Texas 1992
Ph.D. Biological Oceanography University of Rhode Island 1998

WORK EXPERIENCE

Research Assistant
Microbiology and Bioengineering, Trinity University 1989 - 1992
Research Assistant
Grad. School of Oceanography, University of Rhode Island 1992 - 1998
Research Associate (Post-doc)
WET Labs Environmental Optics Fellowship, 1998 - 1999
COAS, Oregon State University
Research Associate
COAS, Oregon State University with Ronald Zaneveld 1999 - present

RESEARCH INTERESTS

Conducting process-oriented research in bio-optics and developing new methodological approaches for the in situ optical characterization of dissolved and particulate material. Present work focuses on developing techniques for the in situ measurement of detrital absorption, elucidating the processes affecting the distribution of chromophoric and fluorophoric dissolved materials in natural waters, and deriving particle size distributions and particle shape information from the inversion of scattering spectra and phase functions.

RECENT PUBLICATIONS

Twardowski, M.S., J.M. Sullivan, P.L. Donaghay, and J.R.V. Zaneveld. 1999. Microscale quantification of the absorption by dissolved and particulate material in coastal waters with an ac-9. J. Atmos. Ocean. Technol. 16(12):691-707.

Twardowski, M.S., and P.L. Donaghay. 1999. Separating in situ and terrigenous sources of absorption by dissolved material in coastal waters. Limnol. Oceanogr., submitted.

Twardowski, M.S., and P.L. Donaghay. 1999. Solar photobleaching of the spectral absorption by dissolved materials in the visible domain: estimating finescale absorption and carbon losses. J. Geophys. Res., submitted.

Twardowski, M.S., and P.L. Donaghay. 1998. The spectral signature associated with the photobleaching of CDOM absorption. Proceedings from Ocean Optics XIV, Kona, HA.

Twardowski, M.S., and P.L. Donaghay. Photobleaching of the absorption by dissolved materials in the visible domain: rates in coastal waters. in prep.

Twardowski, M.S., and P.L. Donaghay. The non-exponential behavior of the absorption spectrum of dissolved materials in the UV and visible domains. in prep.

Twardowski, M.S., R.A. Desiderio, and P.L. Donaghay. The effects of pH and temperature on the absorption by aquatic dissolved materials. in prep.

Ph.D. Advisor: Percy Donaghay (URI)
Post-doc Advisor: Timothy Cowles (OSU)

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Oregon State University
College of Oceanic and Atmospheric Sciences
Environmental Optics - 1999