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Open AccessArticle

Evaluation of Chlorophyll-a and POC MODIS Aqua Products in the Southern Ocean

1
Southern Ocean Carbon and Climate Observatory (SOCCO), CSIR, Rosebank, Cape Town 7700, South Africa
2
Department of Oceanography, University of Cape Town, Rondebosch, Cape Town 7701, South Africa
3
Marine Research Institute (MaRe), University of Cape Town, Rondebosch, Cape Town 7701, South Africa
4
Earth Observation, Council for Scientific and Industrial Research (CSIR), Rosebank, Cape Town 7700, South Africa
5
NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
6
SSAI, Inc., 10210 Greenbelt Road, Suite 600, Lanham, MD 20706, USA
*
Author to whom correspondence should be addressed.
Current address: Royal Meteorological Institute of Belgium, Avenue Circulaire 3, 1180 Brussels, Belgium.
Remote Sens. 2019, 11(15), 1793; https://doi.org/10.3390/rs11151793
Received: 13 June 2019 / Revised: 4 July 2019 / Accepted: 9 July 2019 / Published: 31 July 2019
(This article belongs to the Special Issue Satellite Derived Global Ocean Product Validation/Evaluation)
The Southern Ocean (SO) is highly sensitive to climate change. Therefore, an accurate estimate of phytoplankton biomass is key to being able to predict the climate trajectory of the 21st century. In this study, MODerate resolution Imaging Spectroradiometer (MODIS), on board EOS Aqua spacecraft, Level 2 (nominal 1 km × 1 km resolution) chlorophyll-a (C S a t ) and Particulate Organic Carbon (POC s a t ) products are evaluated by comparison with an in situ dataset from 11 research cruises (2008–2017) to the SO, across multiple seasons, which includes measurements of POC and chlorophyll-a (C i n s i t u ) from both High Performance Liquid Chromatography (C H P L C ) and fluorometry (C F l u o ). Contrary to a number of previous studies, results highlighted good performance of the algorithm in the SO when comparing estimations with HPLC measurements. Using a time window of ±12 h and a mean satellite chlorophyll from a 5 × 5 pixel box centered on the in situ location, the median C S a t :C i n s i t u ratios were 0.89 (N = 46) and 0.49 (N = 73) for C H P L C and C F l u o respectively. Differences between C H P L C and C F l u o were associated with the presence of diatoms containing chlorophyll-c pigments, which induced an overestimation of chlorophyll-a when measured fluorometrically due to a potential overlap of the chlorophyll-a and chlorophyll-c emission spectra. An underestimation of ∼0.13 mg m 3 was observed for the global POC algorithm. This error was likely due to an overestimate of in situ POC i n s i t u measurements from the impact of dissolved organic carbon not accounted for in the blank correction. These results highlight the important implications of different in situ methodologies when validating ocean colour products. View Full-Text
Keywords: remote sensing; ocean color; algorithm; chlorophyll; HPLC; fluorometry; particulate organic carbon; southern ocean remote sensing; ocean color; algorithm; chlorophyll; HPLC; fluorometry; particulate organic carbon; southern ocean
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MDPI and ACS Style

Moutier, W.; Thomalla, S.J; Bernard, S.; Wind, G.; Ryan-Keogh, T.J; Smith, M.E. Evaluation of Chlorophyll-a and POC MODIS Aqua Products in the Southern Ocean. Remote Sens. 2019, 11, 1793. https://doi.org/10.3390/rs11151793

AMA Style

Moutier W, Thomalla SJ, Bernard S, Wind G, Ryan-Keogh TJ, Smith ME. Evaluation of Chlorophyll-a and POC MODIS Aqua Products in the Southern Ocean. Remote Sensing. 2019; 11(15):1793. https://doi.org/10.3390/rs11151793

Chicago/Turabian Style

Moutier, William; Thomalla, Sandy J; Bernard, Stewart; Wind, Galina; Ryan-Keogh, Thomas J; Smith, Marié E 2019. "Evaluation of Chlorophyll-a and POC MODIS Aqua Products in the Southern Ocean" Remote Sens. 11, no. 15: 1793. https://doi.org/10.3390/rs11151793

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