An in situ Validation of Chlorophyll Satellite Imagery

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Abstract/Contents

Abstract: Ocean color satellite imagery has become a useful tool for many areas of oceanographic research. Even with advanced remote sensing technology, shipboard measurements are important for satellite validation. A transect from 16° S to 14° N across the Equatorial Pacific provided the opportunity to compare satellite values of chlorophyll a with shipboard measurements of flow-through fluorometry, vertical fluorometry integrals, and extracted chlorophyll values. There is a strong correlation between satellite measurements and filtered chlorophyll extractions from depths of 50 meters or less. This relationship dramatically decreases for chlorophyll extractions from depths of 75 meters or more. Additionally, there is a weak correlation between satellite measurements and fluorometry values at all depths. The results from this in situ validation indicate that for this region of the Pacific Ocean, satellite values are representative of chlorophyll concentrations in the upper 50 meters of the water column but not down to the chlorophyll maximum (~75 meters). The discrepancy at all depths between fluorometry values and satellite measurements suggests that in situ fluorometer values may not be an appropriate proxy for chlorophyll a concentrations in this region. Future work includes dividing the data set into distinct latitudinal zones for further regional validation.

Type of resource	text
Date created	June 6, 2009

Author	Lowry, Kate

Subject	Stanford@SEA
Subject	S-223
Subject	Hopkins Marine Station
Subject	Department of Biology
Subject	Department of Earth System Science
Subject	BIOHOPK 182H
Subject	BIOHOPK 323H
Subject	EARTHSYS 323
Subject	ESS 323
Subject	satellite
Subject	ocean color
Subject	remote sensing
Subject	validation
Subject	Equatorial Pacific
Subject	chlorophyll
Subject	flow-through fluorometry
Subject	fluorometry
Subject	Pacific Ocean
Genre	Student project report

Location	https://purl.stanford.edu/nq056kr6430

Use and reproduction: User agrees that, where applicable, content will not be used to identify or to otherwise infringe the privacy or confidentiality rights of individuals. Content distributed via the Stanford Digital Repository may be subject to additional license and use restrictions applied by the depositor.
License: This work is licensed under a Creative Commons Attribution 3.0 Unported license (CC BY).

Preferred Citation: Lowry, Kate. 2009. An in situ Validation of Chlorophyll Satellite Imagery. Unpublished Student Work, S-223, Stanford@SEA, Stanford Digital Repository. https://purl.stanford.edu/nq056kr6430.

Stanford@SEA -- Student papers

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