Assessment of three algorithms for the operational estimation of [CHL] from MODIS data in the Western Mediterranean Sea

Pieri, Maurizio; Massi, Luca; Lazzara, Luigi; Nuccio, Caterina; Lapucci, Chiara; Maselli, Fabio

doi:10.5721/eujrs20154822

Cited by 7 publications

(6 citation statements)

References 45 publications

(60 reference statements)

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“…Although planktonic productivity in the region has been relatively well addressed, there have been major challenges in the field, particularly regarding the optical properties of the water column, which are essential for phytoplankton growth and productivity. As phytoplankton are the primary source of the marine food chain, they also control the carbon dioxide uptake by the ocean known as the biological pump and, then play a role in the global carbon cycle (Pieri et al 2015). Evaluating the optical properties of the water column thus plays a key role in determine and understand variations in the fluxes of carbon and associated biogenic elements in the ocean (Platt & Sathyendranath 1988).…”

Section: Introductionmentioning

confidence: 99%

Bio-optical characterization of the waters of the Bay of La Paz, southern Gulf of California, during late spring 2004

Coria-Monter

Monreal‐Gómez

Salas‐de‐León

et al. 2020

Rev. biol. mar. oceanogr.

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Information on selected bio-optical properties and primary production values of the waters of the Bay of La Paz, southern Gulf of California, is reported during June 2004, a region characterized to have very rich biodiversity, including endemic and endangered species, with high ecological relevance. In-situ measurements of natural fluorescence and photosynthetically available radiation (PAR) enabled the subsequent calculation of the incident irradiance (E0), the light extinction coefficient (k), compensation depth (Zc) and critical depth (Zcr). The results suggest the presence of light propitious conditions for phytoplankton community growth and net primary production, which are highly significant for the potential development of models of light penetration, ocean color, primary productivity, and analyses of organic carbon energy flow.

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Section: Introductionmentioning

confidence: 99%

Bio-optical characterization of the waters of the Bay of La Paz, southern Gulf of California, during late spring 2004

Coria-Monter

Monreal‐Gómez

Salas‐de‐León

et al. 2020

Rev. biol. mar. oceanogr.

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“…No in-situ measurements were available in the coastal areas of the AB. Nevertheless, Pieri et al, (2015) have found that the OC3M standard algorithm (used in our work) gives valid results in the Western Mediterranean Sea when the Chl-a concentration does not exceed 1 mg m -3 . In our case, the Chl-a exceeds 1 mg m -3 generally in the three first kilometers from coast (i.e.…”

mentioning

confidence: 68%

“…Previous studies using Chl-a variability as a proxy of the phytoplankton biomass variability along the Algerian basin have focused on large spatial scales, mainly over the continental shelf (Mayot et al, 2016;Pieri et al, 2015;Salgado-Hernanz et al, 2019). They have generally ignored small scales and coastal waters, except locally for sanitary purposes or risk assessment.…”

Section: Sources Of Coastal Enrichmentmentioning

confidence: 99%

Spatio-temporal variability of a chlorophyll-a based biomass index and influence of coastal sources of enrichment in the Algerian Basin

Harid

Demarcq

Keraghel

et al. 2022

Continental Shelf Research

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“…When a pixel from a MODIS L2 image was flagged, it was masked by LAND and CLDICE. HILT was flagged if any of the bands or detectors reaches physical saturation, whereas STRAY-LIGHT showed the brightness of adjacent pixels on a pixel's reflectance value [21]. After this, maps for each month for both SST and Chla were generated using Matlab [17].…”

Section: Methodsmentioning

confidence: 99%

Satellite observations of the effect of the “Godzilla El Niño” on the Tehuantepec upwelling system in the Mexican Pacific

2019

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During 2015-2016, a strong El Niño, the "Godzilla El Niño, " which is similar to El Niño events that occurred in 1982/1983 and 1997/1998, occurred in the Pacific Ocean. In this paper, we report on the influence of the "Godzilla El Niño" on the sea surface temperature (SST) and chlorophyll-a (Chla) concentrations in the Tehuantepec upwelling system using satellite observation data. A time-series of the SST and Chla levels in a circular site with a diameter of approximately 54 km centered at the fixed position (15°N, 94.75°W) for the period from January 2003 to December 2016 was obtained using a Moderate Resolution Imaging Spectroradiometer. To estimate the vertical water velocity, a wind velocity time series was obtained from the Copernicus Marine Environment Monitoring Service to assess its variation over the period from January 2014 to December 2016. The results showed unusually high SSTs (> 28 °C) and atypically low Chla concentrations (< 0.1 mg m −3) in the domain of interest during the winter of 2015/2016. In the region of study, the SST in January 2016 was 5.13 °C higher than it had been in January of 2015, whereas the Chla concentration was 1.56 mg m −3 lower over this period. We found that the "Godzilla El Niño" impacted the Tehuantepec upwelling system in the following ways: (1) the wind and vertical water velocity during the winter of 2015/2016 were slightly higher than those observed during the winters of 2013/2014 and 2014/2015; (2) the coastal SST values were elevated during the winter of 2015/2016 compared to their levels during the previous two winters, revealing nutrientpoor water advection; and (3) the Chla concentrations during the 2015/2016 winter season were unusually low compared to their levels during the previous two winters. Our interpretation of these results is that in the Tehuantepec Gulf the wind was strong and induced vertical water velocities reaching up to 6 m day −1 during the "Godzilla El Niño" event (winter 2015/2016); however, the levels of Chla during this period were lower than they had been in previous years. In particular, the levels were lower than they had been during the previous winters. This suggests that, although the wind during the event favored strong upwelling, the water that was advected to the upper layer was nutrient poor.

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Assessment of three algorithms for the operational estimation of [CHL] from MODIS data in the Western Mediterranean Sea

Cited by 7 publications

References 45 publications

Bio-optical characterization of the waters of the Bay of La Paz, southern Gulf of California, during late spring 2004

Bio-optical characterization of the waters of the Bay of La Paz, southern Gulf of California, during late spring 2004

Spatio-temporal variability of a chlorophyll-a based biomass index and influence of coastal sources of enrichment in the Algerian Basin

Satellite observations of the effect of the “Godzilla El Niño” on the Tehuantepec upwelling system in the Mexican Pacific

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