Distribution of nutrients and chlorophyll across an equatorial reef region: Insights on coastal gradients

Abstract

Environmental variability and hazards on the coastal and continental shelf regions of South America and the Caribbean Special Article CollectionNutrients and chlorophyll across a coral reef

Global Chlorophyll Concentration Distribution and Effects on Bottom Reflectance of Coral Reefs

“…This is reflected in the estimation of mChl-a, for instance, in Costa dos Corais, where [50] conducted monthly sampling of in situ data over a year between 2018 and 2019, reporting a mean Chl-a concentration of 0.78 ± 0.43 mg•m −3 , slightly lower than the satellite-derived mChl-a (1.191 ± 1.973 mg•m −3 ). Furthermore, mChl-a in the Abrolhos reef was highly overestimated compared to observations by [51] (0.92 ± 1.1 mg•m −3 vs. 0.22 ± 0.08 mg•m −3 ). However, it is important to note that the results reported by [51] were based on in situ data collected solely in July 2019, supplemented with 8-day Chl-a data from the MODIS Aqua sensor spanning from 2003 to 2019.…”

“…Furthermore, mChl-a in the Abrolhos reef was highly overestimated compared to observations by [51] (0.92 ± 1.1 mg•m −3 vs. 0.22 ± 0.08 mg•m −3 ). However, it is important to note that the results reported by [51] were based on in situ data collected solely in July 2019, supplemented with 8-day Chl-a data from the MODIS Aqua sensor spanning from 2003 to 2019. Given the temporal limitations of the in situ data, they may not fully capture the overall characteristics of the region.…”

Heatwaves and a decrease in turbidity drive coral bleaching in Atlantic marginal equatorial reefs

“…The MHW is an indicator produced from NOAA's daily optimally interpolated sea surface temperature data and is available at http:// www.marineheatwaves.org/tracker.html (Schlegel and Smit, 2018). It is emphasized that the remote sensing data are valid for assessing the thermal stress in this reef at 18 m depth because the water column is well mixed up to 30 m depth in this region (Soares et al, 2019;Barroso et al, 2023). Wind speeds (m.s -1 ) were obtained through the Brazilian Meteorological Database from an automatic meteorological station in Fortaleza (Ceara, NE Brazil).…”

Environmental variability and hazards in the coastal and continental shelf regions of South America and the Caribbean

“…The authors also used satellite-derived data (including chlorophyll concentration) and water level data to describe the influence of physical parameters in promoting the growth and accumulation of cyanobacteria inside Patos Lagoon. Barroso et al (2023) studied the variability and correlations between phytoplankton biomass and the concentration of inorganic nutrients (phosphate, nitrogen, silicon) in seawater. These authors investigated an area off the Brazilian Semi-Arid Coast (BSC), between 2 o S to 5 o S in the Equatorial Southwestern Atlantic.…”