Examining organic carbon transport by the Orinoco River using SeaWiFS imagery

López, Ramón F. Alonso; Castillo, Carlos E. Del; Miller, Richard L.; Salisbury, Joseph E.; Wisser, Dominik

doi:10.1029/2012jg001986

Cited by 17 publications

(21 citation statements)

References 81 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…). The satellite‐derived values were expected to be higher than the chl‐ a concentrations sampled from the ship due to the likely presence of colored dissolved organic matter, or CDOM, as has been observed previously in the Orinoco River plume (Müller‐Karger et al ., ; del Castillo et al ., ; Salisbury et al ., ; López et al ., ). However, in this case the satellite‐derived estimates of chl‐ a in the plume were in good qualitative agreement with the chl‐ a sample observations from the cruise (which showed a mean of 1.26 ± 0.21 mg m −3 for the seven plume stations, Table ).…”

Section: Resultsmentioning

confidence: 99%

Amazon River water in the northeastern Caribbean Sea and its effect on larval reef fish assemblages during April 2009

Johns

Muhling

Perez

et al. 2014

Fisheries Oceanography

View full text Add to dashboard Cite

During April to June 2009, a large bolus of Amazon River water impacted the northeastern Caribbean Sea. Shipboard observations collected near Saba Bank, the U.S. and British Virgin Islands, and the Anegada Passage showed low surface salinity (35.76 ± 0.05 Practical Salinity Unit (PSU)), elevated surface temperature (26.77 ± 0.14°C), high chlorophyll‐a (1.26 ± 0.21 mg m−3) and high dissolved oxygen (4.90 ± 0.06 mL L−1) in a 20‐ to 30‐m thick surface layer in the riverine plume. The water was ~1°C warmer, 1 PSU fresher, 0.3 mL L−1 higher in oxygen and 1.2 mg m−3 higher in chlorophyll‐a than Atlantic Ocean waters to the north, with Caribbean surface waters showing intermediate values. Plankton net tows obtained in the upper 100 m of the water column revealed larval fish assemblages within the plume that were significantly different from those of the surrounding waters and from those encountered in the area in previous years. The plume waters contained higher concentrations of mesopelagic fish larvae from the families Myctophidae and Nomeidae, which as adults typically inhabit offshore, deep water habitats. Concentrations of larvae from inshore and reef‐associated families such as Scaridae, Serranidae, Labridae and Clupeidae were lower than those found outside the plume in similar shallow areas, particularly in near‐surface waters. An event like the one observed in 2009 had not been documented in at least the past 30 yr, and yet it was followed by another similarly extreme event in 2010. The ecological implications, including any long‐term consequences of such recent extreme events, are important and merit further study.

show abstract

Section: Resultsmentioning

confidence: 99%

Amazon River water in the northeastern Caribbean Sea and its effect on larval reef fish assemblages during April 2009

Johns

Muhling

Perez

et al. 2014

Fisheries Oceanography

View full text Add to dashboard Cite

show abstract

“…Linear relationships of DOC with a CDOM at other wavelengths from <300 nm to 450 nm would have yielded similarly good relationships (Figure S2) based on the strong correlations between DOC and a CDOM at these other wavelengths and equivalent validation results of satellite a CDOM at these other wavelengths from SeaWiFS and MODIS reflectances [ Mannino et al ., ]. Prior studies on satellite retrievals of DOC have involved the utilization of linear relationships between DOC and (1) a CDOM (412) [ Del Castillo and Miller , ], (2) a CDOM (443) [ Matsuoka et al ., ], (3) a CDOM (355) [ Mannino et al ., ; Liu et al ., ], (4) a CDOM (400) [ Griffin et al ., ], (5) salinity computed from a CDOM (443) [ López et al ., ], (6) chlorophyll a and a CDOM (355) [ Liu et al , ], (7) salinity and a CDOM (355) (D. A. Aurin et al, Remote Sensing of CDOM and Dissolved Organic Carbon in the Global Ocean, Remote Sensing Environment , manuscript in revision, 2015), and (8) also a neural network algorithm that employed remote sensing reflectances as model inputs [ Korosov et al ., ]. To our knowledge, the only satellite‐derived DOC distributions that have been formally validated with coincident (±3 h) satellite and in situ matchup data were accomplished by Mannino et al .…”

Section: Discussionmentioning

confidence: 99%

“…DOC correlates strongly with colored dissolved organic matter (CDOM) absorption coefficient ( a CDOM ) for many coastal and inland waters including rivers, estuaries, and continental margins [e.g., Ferrari et al ., ; Vodacek et al ., ; Del Castillo et al ., ; Stedmon et al ., ; Mannino et al ., ; Fichot and Benner , ; Spencer et al ., ]. This permits satellite retrievals of DOC from satellite‐derived a CDOM [ Del Castillo and Miller , ; Mannino et al ., ; Griffin et al ., ; López et al ., ; Liu et al ., ]. Satellite‐derived DOC distributions have also been applied to quantify DOC stocks on continental margins [ Mannino et al ., ; Liu et al ., ], fluxes of DOC from rivers to the continental shelf [ Del Castillo and Miller , ; López et al ., ] and net community production of DOC [ Mannino et al ., ].…”

Section: Introductionmentioning

confidence: 99%

Dissolved organic carbon fluxes in the Middle Atlantic Bight: An integrated approach based on satellite data and ocean model products

et al. 2016

View full text Add to dashboard Cite

Continental margins play an important role in global carbon cycle, accounting for 15-21% of the global marine primary production. Since carbon fluxes across continental margins from land to the open ocean are not well constrained, we undertook a study to develop satellite algorithms to retrieve dissolved organic carbon (DOC) and combined these satellite data with physical circulation model products to quantify the shelf boundary fluxes of DOC for the U.S. Middle Atlantic Bight (MAB). Satellite DOC was computed through seasonal relationships of DOC with colored dissolved organic matter absorption coefficients, which were derived from an extensive set of in situ measurements. The multiyear time series of satellite-derived DOC stocks (4.9 Teragrams C; Tg) shows that freshwater discharge influences the magnitude and seasonal variability of DOC on the continental shelf. For the 2010-2012 period studied, the average total estuarine export of DOC into the MAB shelf is 0.77 Tg C yr (year). The integrated DOC tracer fluxes across the shelf boundaries are 12.1 Tg C yr entering the MAB from the southwest alongshore boundary, 18.5 Tg C yr entering the MAB from the northeast alongshore boundary, and 29.0 Tg C yr flowing out of the MAB across the entire length of the 100 m isobath. The magnitude of the cross-shelf DOC flux is quite variable in time (monthly) and space (north to south). The highly dynamic exchange of water along the shelf boundaries regulates the DOC budget of the MAB at subseasonal time scales.

show abstract

“…10). The areanormalized DOC export of 1.0 ton km -2 year -1 , is comparable to that of many arctic or temperate watersheds, but less than many tropical or peatdominated watersheds (Table 1, Aitkenhead and McDowell 2000;Giesler et al 2014;Jones and Schilling 2012;Khadka et al 2014;Lopez et al 2012;Wilson et al 2013). The portion of DOC calculated to be groundwater-derived ranged from 67 % for the upper watershed to 94 % in the lower watershed, both recorded during higher flow conditions.…”

Section: Riverine Carbon Exportmentioning

confidence: 74%

Spatiotemporal variations in carbon dynamics during a low flow period in a carbonate karst watershed: Santa Fe River, Florida, USA

et al. 2014

View full text Add to dashboard Cite

To understand role of biogeochemical reactions in controlling the amount and molecular form of dissolved carbon exported from carbonate terrains, spatiotemporal variations in dissolved organic carbon (DOC) and dissolved inorganic carbon (DIC) were observed over one year in the Santa Fe River system, a period of base flow or below. A water mixing model developed using concentrations of Na ? , Cl -, and SO 4 -2 identified three major water sources: soil water, groundwater and deep aquifer water. After accounting for mixing of these water sources, additional chemical signatures resulting from biogeochemical processes in the riparian zone were identified. Net mineralization of DOC occurred throughout the Santa Fe River watershed, particularly during the lowest flow conditions and in the upper watershed. However, natural dissolved organic matter was more labile during low flow and in the lower watershed, and predominantly derived from groundwater (rather than soil water) in all samples, likely via releases during carbonate dissolution. Carbonate dissolution commonly occurred in the upper watershed during low flow conditions, while carbonate minerals precipitated during baseflow, as well as in the lower watershed during very low flow conditions. Thus, riparian zone biogeochemical processes were strongly mediated by watershed hydrology, whose spatiotemporal variations resulted in greater inorganic and organic C export production in the lower watershed than the upper watershed, and during higher flow versus lower flow periods. During this lower flow period, the Santa Fe River watershed exported *1.0 and 10.3 ton km -2 year -1 DOC and DIC, respectively, representing higher C yields than many other types of watersheds.

show abstract

Examining organic carbon transport by the Orinoco River using SeaWiFS imagery

Cited by 17 publications

References 81 publications

Amazon River water in the northeastern Caribbean Sea and its effect on larval reef fish assemblages during April 2009

Amazon River water in the northeastern Caribbean Sea and its effect on larval reef fish assemblages during April 2009

Dissolved organic carbon fluxes in the Middle Atlantic Bight: An integrated approach based on satellite data and ocean model products

Spatiotemporal variations in carbon dynamics during a low flow period in a carbonate karst watershed: Santa Fe River, Florida, USA

Contact Info

Product

Resources

About