NDLI: Visible Reflectance Spectroscopy on a Buoy-Mounted Aerosol Sampler: Development of a Sensor for Quantifying the Deposition of Mineral Dust to the Oceans

Content Provider	IEEE Xplore Digital Library
Author	White, S.N. Sholkovitz, E. Farr, N.
Copyright Year	2006
Description	Author affiliation: Woods Hole Oceanogr. Inst., MA (White, S.N.; Sholkovitz, E.; Farr, N.)
Abstract	Iron deficiency has been shown to limit the growth of phytoplankton in the high-nutrient, low-chlorophyll regions of the Equatorial Pacific, Southern Ocean, and Subarctic North Pacific, and is a potentially limiting nutrient for nitrogen-fixing phytoplankton, which represent an important component of primary production in oceans. The major source of iron to the open ocean is the atmospheric transport and deposition of iron-bearing soil dust from the arid regions of North Africa, central Asia and Australia. A buoy-mounted aerosol sampler deployed on the Bermuda Testbed Mooring collected a time series of samples allowing quantification of the deposition of African aerosol iron to the Sargasso Sea. We are developing a sensor using visible reflectance spectroscopy (VRS) that can be integrated with this sampler to make real-time measurements of the concentration of iron in aerosol dust over the oceans. In VRS, a white light source illuminates the sample and the spectrum of the reflected light is recorded. Analyses of the spectra include calculating percent color and the first derivative of the spectrum. As the amount of iron in the sample increases, the percentage of red increases. The first derivatives of the spectra contain peaks which can identify iron minerals (e.g., hematite & goethite). The ability to couple aerosol dust analysis with in-water iron measurements will increase our understanding of how iron enters the oceans and what role it plays in the marine biosphere
Starting Page	1
Ending Page	6
File Size	6806900
Page Count	6
File Format	PDF
ISBN	1424401143
DOI	10.1109/OCEANS.2006.307047
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-09-18
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Reflectivity Spectroscopy Aerosols Minerals Oceans Iron Sea measurements Production Soil Africa
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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