Distributions of dissolved manganese and fluorescent dissolved organic matter in the Columbia River estuary and plume as determined by in situ measurement

1997 ◽  
Vol 56 (1-2) ◽  
pp. 1-14 ◽  
Author(s):  
G.P. Klinkhammer ◽  
C.S. Chin ◽  
C. Wilson ◽  
M.D. Rudnicki ◽  
C.R. German
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
River Estuary ◽  
Columbia River ◽  
In Situ Measurement ◽  
Columbia River Estuary ◽  
Fluorescent Dissolved Organic Matter

scholarly journals Sedimentary supply of humic-like fluorescent dissolved organic matter and its implication for chemoautotrophic microbial activity in the Izu-Ogasawara Trench

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
M. Shigemitsu ◽  
T. Yokokawa ◽  
H. Uchida ◽  
S. Kawagucci ◽  
A. Murata
Keyword(s):  
Organic Matter ◽  
Community Structure ◽  
Dissolved Organic Matter ◽  
Oxygen Utilization ◽  
Fluorescent Dissolved Organic Matter ◽  
Vertical Distributions ◽  
The Difference ◽  
The Relationship ◽  
Apparent Oxygen Utilization

AbstractMicrobial community structure in the hadal water is reported to be different from that in the upper abyssal water. However, the mechanism governing the difference has not been fully understood. In this study, we investigate the vertical distributions of humic-like fluorescent dissolved organic matter (FDOMH), chemoautotrophic production, apparent oxygen utilization (AOU), and N* in the Izu-Ogasawara Trench. In the upper abyssal waters (< 6000 m), FDOMH has a significantly positive correlation with AOU; FDOMH deviates from the relationship and increases with depth without involving the increment of AOU in the hadal waters. This suggests that FDOMH is transferred from the sediments to the hadal waters through pore water, while the FDOMH is produced in situ in the upper abyssal waters. Chemoautotrophic production and N* increases and decreases with depth in the hadal waters, respectively. This corroborates the effluxes of dissolved substances, including dissolved organic matter and electron donors from sediments, which fuels the heterotrophic/chemoautotrophic microbial communities in the hadal waters. A simple box model analysis reveals that the funnel-like trench topography facilitates the increase in dissolved substances with depth in the hadal waters, which might contribute to the unique microbiological community structure in these waters.

scholarly journals Impacts of Hurricane Disturbance on Water Quality across the Aquatic Continuum of a Blackwater River to Estuary Complex

2020 ◽  
Vol 8 (6) ◽  
pp. 412
Author(s):  
Tracey Schafer ◽  
Nicholas Ward ◽  
Paul Julian ◽  
K. Ramesh Reddy ◽  
Todd Z. Osborne
Keyword(s):  
Water Quality ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Saline Water ◽  
System Response ◽  
Blackwater River ◽  
Fluorescent Dissolved Organic Matter ◽  
Hurricane Disturbance ◽  
Wind Velocities

Hurricanes cause landscape-scale disturbances that affect biogeochemical cycling and water quality in coastal ecosystems. During Hurricane Irma’s passage through northern Florida, water movements driven by wind velocities up to 105 km h−1 caused a salinity peak in an estuary/blackwater river complex. Water quality was monitored across the 15 km site to detect the magnitude and duration of disturbance. Saline water intruded 15 km inland into a freshwater portion of the river that peaked at a salinity of 2 psu. Due to the volume of precipitation from the hurricane, significant runoff of freshwater and dissolved organic matter (DOM) caused a decrease in salinity, dissolved oxygen (DO), and Chlorophyll-a concentrations while increasing turbidity and fluorescent dissolved organic matter (fDOM). The disturbance caused rapid changes observed by in-situ water quality monitors over a 3-week period, but some effects persisted for longer periods as shown by 3-month weekly water sampling. This disturbance caused shifts in DOM loading, altered salinity dynamics, and reshaped landscapes due to wind and wave surge both in upland marsh and downstream estuary. Hurricane disturbance temporarily and abruptly alters the aquatic continuum, and observations of system response can help us understand the mechanisms associated with ecosystem resilience and recovery.

scholarly journals Quantity and quality of particulate organic matter controls bacterial production in the Columbia River estuary

2017 ◽  
Vol 62 (6) ◽  
pp. 2713-2731 ◽  
Author(s):  
Byron C. Crump ◽  
Lindy M. Fine ◽  
Caroline S. Fortunato ◽  
Lydie Herfort ◽  
Joseph A. Needoba ◽  
...  
Keyword(s):  
Organic Matter ◽  
Particulate Organic Matter ◽  
Bacterial Production ◽  
River Estuary ◽  
Columbia River ◽  
Columbia River Estuary

scholarly journals Sources, fluxes, and behaviors of fluorescent dissolved organic matter (FDOM) in the Nakdong River Estuary, Korea

2018 ◽  
Vol 15 (4) ◽  
pp. 1115-1122 ◽  
Author(s):  
Shin-Ah Lee ◽  
Guebuem Kim
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Stable Carbon Isotope ◽  
Spring Tide ◽  
River Estuary ◽  
Mixing Zone ◽  
Nakdong River ◽  
Estuarine Mixing ◽  
Fluorescent Dissolved Organic Matter ◽  
The Nakdong River

Abstract. We monitored seasonal variations in dissolved organic carbon (DOC), the stable carbon isotope of DOC (δ13C-DOC), and fluorescent dissolved organic matter (FDOM) in water samples from a fixed station in the Nakdong River Estuary, Korea. Sampling was performed every hour during spring tide once a month from October 2014 to August 2015. The concentrations of DOC and humic-like FDOM showed significant negative correlations against salinity (r2= 0.42–0.98, p < 0.0001), indicating that the river-originated DOM components were the major source and behave conservatively in the estuarine mixing zone. The extrapolated δ13C-DOC values (−27.5 to −24.5 ‰) in fresh water confirm that both components are mainly of terrestrial origin. The slopes of humic-like FDOM against salinity were 60–80 % higher in the summer and fall due to higher terrestrial production of humic-like FDOM. The slopes of protein-like FDOM against salinity, however, were 70–80 % higher in spring due to higher biological production in river water. Our results suggest that there are large seasonal changes in riverine fluxes of humic- and protein-like FDOM to the ocean.

scholarly journals Seasonal variability of dissolved organic matter in the Columbia River: In situ sensors elucidate biogeochemical and molecular analyses

2016 ◽  
Author(s):  
Urban Johannes Wünsch ◽  
Boris Peter Koch ◽  
Matthias Witt ◽  
Joseph Andrew Needoba
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Seasonal Variability ◽  
Columbia River ◽  
Doc Concentration ◽  
Highly Correlated ◽  
The Relationship ◽  
Ft Icr Ms ◽  
Ft Icr

Abstract. The in situ detection of fluorescent dissolved organic matter (FDOM) at high temporal resolution is a powerful proxy to follow dissolved organic matter (DOM) dynamics and DOM flux to coastal oceans when FDOM measurements and dissolved organic carbon (DOC) are highly correlated. Here, we investigated the relationship between FDOM sensors and DOC concentration in the lower Columbia River, USA in spring and summer 2013. Furthermore, we studied the seasonal variability of FDOM and chromophoric DOM (CDOM) optical indices, as well as the seasonal and spatial variability for the molecular characteristics of DOM using ultrahigh resolution electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS). The fieldwork was conducted concurrently with the operation of in situ sensor platforms that recorded physical and biogeochemical data at hourly intervals. In situ FDOM and DOC concentration was highly correlated and the relationship was used to quantify the river's DOC flux between March and August 2013. The average flux was 0.93 Gg d−1, which included over three-fold temporal variability (0.45 to 1.62 Gg d−1) associated with seasonal biogeochemical variability. Spectrofluorometry measurements demonstrated that FDOM parameters correlated with major seasonal biogeochemical shifts in the river associated with phytoplankton blooms and river discharge and thus revealed predictable seasonal patterns in DOM quality. FT-ICR-MS analyses elucidated these shifts on the molecular level: the relative abundance of 561 formulas, most of which contained N and S, correlated significantly with chlorophyll a, while 417 formulas (mostly CHO) correlated with CDOM absorbance at 254 nm.

scholarly journals Multi-Parameter Compensation Method for Accurate In Situ Fluorescent Dissolved Organic Matter Monitoring and Properties Characterization

Water ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 1146 ◽  
Author(s):  
Guilherme de Oliveira ◽  
Edoardo Bertone ◽  
Rodney Stewart ◽  
John Awad ◽  
Aleicia Holland ◽  
...  
Keyword(s):  
Organic Matter ◽  
Water Treatment ◽  
Dissolved Organic Matter ◽  
Treatment Plant ◽  
Drinking Water Treatment ◽  
Water Quality Monitoring ◽  
Suspended Particles ◽  
Site Specific ◽  
Fluorescent Dissolved Organic Matter

The recent deployment of fluorescent dissolved organic matter (fDOM) probes in dam catchments and drinking water treatment plants (DWTP) for water quality monitoring purposes has resulted in the production of a large amount of data that requires scientific evaluation. This study introduces a comprehensive, transferable methodological framework for scientists and water professionals to model fluorescence site-specific quenching on fDOM probe readings caused by temperature, suspended particles, and the inner filter effect (IFE) and applies it to an Australian subtropical reservoir. The findings revealed that quenching due to turbidity and IFE effects were best predicted by threshold autoregressive models. Raw fDOM probe measurements were validated as being more reliable if they were systematically compensated using the proposed procedure. The developed fDOM compensation procedure must consider the instrument features (i.e., wavelength broadband and responsiveness) and site-specific conditions (i.e., DOM characteristics and suspended particles). A finding of particular interest was that the compensated normalized fDOM readings had a high correlation with the low (<500 Da) molecular weight fraction of the DOM, which is more recalcitrant to removal by coagulation. As a consequence, there is potential to use compensated fDOM probe readings to provide real-time, in situ information on DOM properties in freshwater systems, which will enable water treatment plant operators to optimize the coagulation process.

scholarly journals Distribution, seasonality, optical characteristics, and fluxes of dissolved organic matter (DOM) in the Pearl River (Zhujiang) estuary, China

2018 ◽  
Author(s):  
Yang Li ◽  
Guisheng Song ◽  
Philippe Massicotte ◽  
Fangming Yang ◽  
Ruihuan Li ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Pearl River ◽  
Fluorescent Dissolved Organic Matter ◽  
Organic Carbon Concentration ◽  
Parallel Factor ◽  
Zhujiang Estuary ◽  
The Pearl River

Abstract. Dissolved organic carbon concentration in the Pearl River estuary (PRE) of China was measured in May, August, and October 2015 and January 2016. Chromophoric and fluorescent dissolved organic matter (CDOM and FDOM) in the latter three seasons were characterized by absorption and fluorescence spectroscopy. Parallel factor analysis of the fluorescence spectra identified two protein-like, two humic-like, and one oxidized quinone-like FDOM components. The seasonality of average DOM abundance varied as follows: DOC: May (156 μmol L−1) > January (114 μmol L−1) ≈ August (112 μmol L−1) > November (86 μmol L−1); CDOM absorption at 330 nm: August (1.76 m−1) > November (1.39 m−1) ≈ January (1.30 m−1); FDOM expressed as the sum of the maximum fluorescence intensities of all FDOM components: November (1.77 R.U.) > August (1.54 R.U.) ≈ January (1.49 R.U.). Average DOM abundance in surface water was higher than in bottom water, their difference being marginal (0.1–10 %) for DOC in all seasons and for CDOM and FDOM in November and January, and moderate (16–21 %) for CDOM and FDOM in August. DOC showed little cross-estuary variations in all seasons while CDOM and FDOM in January were higher on the west side of the estuary than in the middle and on the east side. All three variables exhibited large variations and/or rapid drawdowns at the head of the estuary (salinity 

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