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Proceedings Paper

Diurnal changes in ocean color in coastal waters
Author(s): Robert Arnone; Ryan Vandermeulen; Sherwin Ladner; Michael Ondrusek; Charles Kovach; Haoping Yang; Joseph Salisbury
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Paper Abstract

Coastal processes can change on hourly time scales in response to tides, winds and biological activity, which can influence the color of surface waters. These temporal and spatial ocean color changes require satellite validation for applications using bio-optical products to delineate diurnal processes. The diurnal color change and capability for satellite ocean color response were determined with in situ and satellite observations. Hourly variations in satellite ocean color are dependent on several properties which include: a) sensor characterization b) advection of water masses and c) diurnal response of biological and optical water properties. The in situ diurnal changes in ocean color in a dynamic turbid coastal region in the northern Gulf of Mexico were characterized using above water spectral radiometry from an AErosol RObotic NETwork (AERONET -WavCIS CSI-06) site that provides up to 8-10 observations per day (in 15-30 minute increments). These in situ diurnal changes were used to validate and quantify natural bio-optical fluctuations in satellite ocean color measurements. Satellite capability to detect changes in ocean color was characterized by using overlapping afternoon orbits of the VIIRS–NPP ocean color sensor within 100 minutes. Results show the capability of multiple satellite observations to monitor hourly color changes in dynamic coastal regions that are impacted by tides, re-suspension, and river plume dispersion. Hourly changes in satellite ocean color were validated with in situ observation on multiple occurrences during different times of the afternoon. Also, the spatial variability of VIIRS diurnal changes shows the occurrence and displacement of phytoplankton blooms and decay during the afternoon period. Results suggest that determining the temporal and spatial changes in a color / phytoplankton bloom from the morning to afternoon time period will require additional satellite coverage periods in the coastal zone.

Paper Details

Date Published: 17 May 2016
PDF: 8 pages
Proc. SPIE 9827, Ocean Sensing and Monitoring VIII, 982711 (17 May 2016); doi: 10.1117/12.2241018
Show Author Affiliations
Robert Arnone, The Univ. of Southern Mississippi (United States)
Ryan Vandermeulen, SSAI / NASA (United States)
Sherwin Ladner, U.S. Naval Research Lab. (United States)
Michael Ondrusek, NOAA Ctr. for Weather and Climate Prediction (United States)
Charles Kovach, NOAA Ctr. for Weather and Climate Prediction (United States)
Haoping Yang, The Univ. of Southern Mississippi (United States)
Joseph Salisbury, The Univ. of New Hampshire (United States)

Published in SPIE Proceedings Vol. 9827:
Ocean Sensing and Monitoring VIII
Weilin W. Hou; Robert A. Arnone, Editor(s)

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