Geoscience Reference
In-Depth Information
Likewise, selecting deployment platforms and knowledge of study environment is essential
to collecting measurements over appropriate temporal and spatial scales. Beyond gathering
measurements is the need for analysts to adhere collectively to standardized methodolo-
gies for calibration of sensors. Whatever methods are conducted (e.g., blank subtraction,
temperature correction, intensity standardization) need to be documented clearly in the
literature. This will result in high-quality assurance of data throughout the community and
the ability for intercomparison of data among laboratories.
Forging ahead, continuous advancements in sensor development and materials research
are enabling measurements with LEDs and filters centered on shorter wavelengths, lower
power consumption, and longer deployment durations. Emerging are reliable sensors with
multiwavelength capabilities, sondes that include fluorescent NOM measurements for
characterizing CDOM and “smart” FDOM sensors that include algorithms to utilize con-
temporaneous ancillary water quality measurements to calculate corrections in situ . These
advancements lend promise to improved biogeochemical investigations, both qualitatively
and quantitatively, of DOM in aquatic environments.
Acknowledgments
The authors wish to thank the science and engineering pioneers who forged ahead to
develop and demonstrate the utility of in situ NOM fluorescence measurements. We
greatly appreciate the reviewers of this chapter and all those who contributed pictures,
data or diagrams to this chapter, particularly Paul Soderlind for redrawing of previously
published figures. The information in this document has been funded in part by the U.S.
Environmental Protection Agency. It has been subjected to review by the National Health
and Environmental Effects Research Laboratory and approved for publication. Approval
does not signify that the contents reflect the views of the Agency, nor does mention of trade
names or commercial products constitute endorsement or recommendation for use. This is
a contribution from the Gulf Ecology Division.
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