Geography
Document Type
Article
Abstract
We analyzed a variety of satellite-based ocean color products derived using MODIS-Aqua to investigate the most accurate empirical and semi-analytical algorithms for representing in-situ chromophoric dissolved organic matter (CDOM) across a large latitudinal transect in the Bering, Chukchi, and western Beaufort Seas of the Pacific Arctic region. In particular, we compared the performance of empirical (CDOM index) and several semi-analytical algorithms (quasi-analytical algorithm (QAA), Carder, Garver-Siegel-Maritorena (GSM), and GSM-A) with field measurements of CDOM absorption (aCDOM) at 412 nanometers (nm) and 443 nm. These algorithms were compared with in-situ CDOM measurements collected on cruises during July 2011, 2013, 2014, 2015, 2016, and 2017. Our findings show that the QAA a443 and GSM-A a443 algorithms are the most accurate and robust representation of in-situ conditions, and that the GSM-A a443 algorithm is the most accurate algorithm when considering all statistical metrics utilized here. Our further assessments indicate that geographic variables (distance to coast, latitude, and sampling transects) did not obviously re-late to algorithm accuracy. In general, none of the algorithms investigated showed a statistically significant agreement with field measurements beyond an approximately ± 60 h offset, likely owing to the highly variable environmental conditions found across the Pacific Arctic region. As such, we suggest that satellite observations of CDOM in these Arctic regions should not be used to represent in-situ conditions beyond a ± 60 h timeframe.
Publication Title
Remote Sensing
Publication Date
2021
Volume
13
Issue
18
DOI
10.3390/rs13183673
Keywords
Arctic, Arctic ocean, Beaufort sea, Bering sea, CDOM, Chukchi sea, MODIS-aqua, semi-analytical algorithm
Repository Citation
Santiago, Melishia I. and Frey, Karen E., "Assessment of empirical and semi-analytical algorithms using modis-aqua for representing in-situ chromophoric dissolved organic matter (Cdom) in the bering, chukchi, and western beaufort seas of the pacific arctic region" (2021). Geography. 189.
https://commons.clarku.edu/faculty_geography/189
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.