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Department of Estuarine and Ocean Sciences Weekly Seminar

When: Wednesday, October 7, 2015
12:30 PM - 1:30 PM
Where: > See description for location
Description: The School for Marine Science and Technology
Department of Estuarine and Ocean Sciences
Seminar Announcement


At-sea measurement of N2/Ar ratio for studying N-loss processes in the Mexican ODZ


Mark Altabet
Professor
Department of Estuarine and Ocean Sciences
SMAST
UMass Dartmouth


Wednesday, October 7, 2015
12:30 pm - 1:30 pm
SMAST I, Room 204
706 S. Rodney French Blvd
New Bedford, MA

Abstract:
Microbial conversion of nitrate to N2 gas in oceanic O2 deficient zones (ODZ's) is among the most important routes for the loss of fixed nitrogen from the ocean. Detecting directly this biogenic production of N2 is difficult due to the large background of N2 of atmospheric origin, but is feasible through precise determination of the ratio of N2 to inert Ar gas. Typically this is done on samples returned to the lab for mass spectrometer analysis. Here we present the first results for at-sea measurement of N2/Ar on both discrete samples and from continuous pump profiles that have the advantages of greater certainty in the fidelity of the samples and very high vertical resolution.


Note: Seminar will be simulcast to SMAST II, Room 325.
You can view the seminar live by logging into
https://echosystem.umassd.edu:8443/ess/portal/section/9f732442-8871-46c1-a9c1-d11db930bb39
Please note: the earliest you will be able to log in is
15 minutes before the regularly scheduled time.

To view a video of an SMAST seminar (post-October 1st), go to http://www.umassd.edu/smast/newsandevents/seminarseries/ and click on a highlighted title.

For additional information, please contact Sue Silva at s1silva@umassd.edu
Contact: > See Description for contact information
Topical Areas: University Community