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USGS Seminar

November 27, 3:00pm - 4:15pm
Manoa Campus, St. John 11 Add to Calendar

Seeing the light: Applications of in-situ optical sensors for high frequency water quality monitoring and research

Dr. Brian A. Pellerin, USGS California Water Science Center

A challenge for accurately measuring the sources, loads and cycling of dissolved organic matter (DOM) and nutrients is making measurements at the time scales in which changes occur in aquatic systems. Traditional approaches for data collection (daily to monthly discrete samples) are often limited by high analytical and field costs, difficult site access, and logistical challenges, particularly for long-term sampling at a large number of sites. The ability to make optical measurements (absorbance and fluorescence) in-situ has been known for more than 50 years, but much of the work using commercially-available sensors in rivers and streams has taken place in only the last few years. Relatively simple optical measurements made in-situ are being incorporated into several USGS research and monitoring programs, resulting in advanced understanding of constituent loads, sources, and cycling in freshwater systems. This talk will present several examples from rivers and streams that highlight the application of continuous optical measurements for understanding DOM and nutrient dynamics at intervals of minutes to hours, as well as proxy measurements for constituents that are significantly more difficult and expensive to measure at high frequencies such as methylmercury and trihalomethane.

Short bio: Received B.S. (1998) and Ph.D. (2004) from the University of New Hampshire, M.S. (2000) from the University of Maine. Ph.D. was in the interdisciplinary Natural Resources and Earth Systems Science program and focused on the hydrology and nutrient biogeochemistry of small urban watersheds. I have been at the USGS CA Water Science Center since 2004 as an NRC Post-Doc (2004-2007) and Soil Scientist/Research Soil Scientist (2007-present). Most of my current work is on the use of in situ optical sensors for carbon and nutrients in small watersheds and large coastal rivers across the country.

Event Sponsor
Water Resources Research Center, Manoa Campus

More Information
Philip Moravcik, 956-3097,

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Tuesday, November 27
8:00am American Studies Coffee Hour: FAFSA, Scholarships, & Financial Aid
Manoa Campus, Tokioka Room (Moore Hall 319)
10:00am Students Helping Aloha United Way Silent Auction
Manoa Campus, Campus Center Dining Room 203 E
10:30am Graduate & Law Schools Fair
Manoa Campus, Legacy Path
12:00pm Linguistics Seminar
Manoa Campus, St. John Auditiorium (St. John, Room 011)
1:30pm Chris Petersen, cello
Manoa Campus, Orvis Auditorium
3:00pm USGS Seminar
Manoa Campus, St. John 11
3:00pm Academic Preparation & Application Process for Graduate School Workshop
Manoa Campus, Campus Center 309
5:00pm Take Time to Take Care of You!
Manoa Campus, University of Hawaii at Manoa Childrenʻs Center, 2320 Dole Street, Honolulu, HI 96822
5:30pm CR2: West Coast Consortium of Private Law School Panel
Manoa Campus, Classroom 2
5:30pm Law Admissions Panel
Manoa Campus, 2600 Campus Road
5:30pm Admissions: JD Info Session
Manoa Campus, Law School, Classroom 2
6:30pm Public Health Movie Night: Forks Over Knives
Manoa Campus, Biomed B103
7:30pm Marina Mitsuta, piano
Manoa Campus, Orvis Auditorium
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