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154 results for “Dissolved oxygen”
Dissolved oxygen and pH data collected in shallow riparian ponds from June - September 2013 for a study on hypoxia and hyperoxia.
Dissolved Oxygen and pH data collected using YSI sondes in shallow riparian ponds over three 72 hour periods in June, July, and September focused on patches of dominant vegetation within this pond. The differences in data represent the impact of these dominant vegetation patches on the oxygen dynamics and metabolism of the aquatic system. Data was collected either hourly or in five minute increments over the three study periods which were intended to capture spring (June), summer (July), and fall (September) conditions in the pond. The pond did experience successive states of pond vegetation over the seasons so some macrophytes are not represented in all seasons. Data also includes summary information taken from the primary oxygen data showing hours of hypoxia or hyperoxia or basicity in the various vegetation treatments.
High-frequency time series of stage height, stream discharge, and water quality (specific conductivity, dissolved oxygen, pH, temperature, turbidity) for Stroubles Creek in Blacksburg, Virginia, USA 2013-2018
A pressure transducer (CS450, Campbell Scientific Inc., Logan, UT, USA) and a multi-parameter water quality sonde (YSI Series 6:6920 v2, YSI Inc., Yellow Springs, OH, USA) were deployed by the Virginia Tech Biological Systems Engineering (BSE) Stream Research, Education, and Management (StREAM) Lab (vtstreamlab.weebly.com/) from January 2013 to December 2018 to assess stage and water quality, and calculate discharge in Stroubles Creek, Blacksburg, VA (4118326.215 N, 549236.02 W). Stroubles Creek is a 19 km tributary of the New River in Blacksburg, Virginia, USA. Stroubles Creek begins immediately below the Virginia Tech campus and flows north into the Kanawha River in the Valley and Ridge physiographic province. Stroubles Creek was a historic water supply for the town of Blacksburg and remains a highly visible waterway in the town, as it traverses both the downtown area and much of the Virginia Tech campus. In 2002, Stroubles Creek was placed on Virginia’s 303(d) list of impaired water bodies with a benthic impairment by the Virginia Department of Environmental Quality (VADEQ). A total maximum daily load (TMDL) plan was subsequently developed in 2003 for the stream in collaboration with Virginia Tech’s BSE department, the Virginia Department of Environmental Quality, and the Virginia Department of Conservation and Recreation. During 2008-2010, a 2.1 km reach of Stroubles Creek, mostly upstream of the StREAM Lab, was restored by means of cattle exclusion, natural revegetation, bank reshaping, and creating an inset floodplain. The water quality dataset provided here is associated with the upper Stroubles Creek watershed which drains approximately 14.5 km2. Currently, data from the StREAM Lab are used by 8-10 faculty and their graduate students in 7 departments across 5 colleges at Virginia Tech for research and at least 16 classes for field labs and/or assignments.
Seeing the light: high temporal frequency (5-10min resolution) measurements of dissolved oxygen, photosynthetically active radiation, temperature, and depth used to estimate metabolism in restored and unrestored Baltimore streams.
The continually increasing global population residing in urban landscapes impacts numerous ecosystem functions and services provided by urban streams. Urban stream restoration is often employed to offset these impacts and conserve or enhance the various functions and services these streams provide. Despite the assumption that ‘if you build it, [the function] will come’, current understanding of the effects of urban stream restoration on stream ecosystem functions are based on short term studies which may not capture variation in restoration effectiveness over time. We quantified the impact of stream restoration on nutrient and energy dynamics of urban streams by studying 10 urban stream reaches (five restored, five unrestored) in the Baltimore, Maryland, USA, region over a two-year period. We measured gross primary production (GPP) and ecosystem respiration (ER) at the whole-stream scale continuously throughout the study and nitrate (NO3-N) spiraling rates seasonally (spring, summer, autumn) across all reaches. There was no significant restoration effect on NO3-N spiraling across reaches. However, there was a significant canopy cover effect on NO3-N spiraling, and directly comparing paired sets of unrestored-restored reaches showed that restoration does affect NO3-N spiraling after accounting for other environmental variation. Furthermore, there was a change in GPP:ER seasonality, with restored and open-canopied reaches exhibiting higher GPP:ER during summer. The restoration effect, though, appears contingent upon altered canopy cover, which is likely to be a temporary effect of restoration and is a driver of multiple ecosystem services, e.g., habitat, riparian nutrient processing. Our results suggest that decision-making about stream restoration, including evaluations of nutrient benefits, clearly needs to consider spatial and temporal dynamics of canopy cover and tradeoffs among multiple ecosystem services. Here we provide the raw dissolved oxygen, temperature, li
Caribou-Poker Creeks Research Watershed (CPCRW): 15 min stream temperature and chemistry (nitrate-N, fDOM, specific conductivity, turbidity, dissolved oxygen, PAR) from May-Sept 2017
This dataset contains 15 min stream temperature and chemistry (nitrate-N, fDOM, specific conductivity, turbidity, dissolved oxygen) of streams draining the C2, C3, P6, and C4 subcatchments of the Caribou-Poker Creeks Research Watershed (CPCRW). Photosynthetic active radiation at the stream surface is also provided. Data is given in tidy format: each variable forms 1 column, each 15-min observation forms 1 row, and data is sortable by site and timestamp.
McMurdo Dry Valleys LTER: Dissolved oxygen measurements in supraglacial streams on Canada Glacier, Antarctica, January 2019
We installed dissolved oxygen sensors in three locations on a supraglacial stream network on Canada Glacier in Taylor Valley, Antarctica in conjunction with a series of nutrient tracer injection experiments. This data collection was intended to provide context for respiration and primary productivity via dissolved oxygen dynamics during our nutrient tracer injections. Sensors were deployed a day before the start of the tracer series and collected on the last day of experiments. Over the course of their deployment, two of the three locations had issues with freezing around the sensor and produced large artifacts (swings) in the data.Â
Sediment profiles of dissolved oxygen and nitrous oxide along with temperature and sediment water content, Rowley River, Rowley, MA
Environmental pulses, or sudden, marked changes to the conditions within an ecosystem, can be important drivers of resource availability in many systems. In this study, we investigated the effect of tidal pulsing on the fluxes of nitrous oxide (N2O), a powerful greenhouse gas, from a marine intertidal mudflat on the north shore of Massachusetts, USA. We found these tidal flat sediments to be a sink of N2O at low tide with an average uptake rate of ??6.7 6 2 lmol??m??2??h??1. Further, this N2O sink increased the longer sediments were tidally exposed. These field measurements, in conjunction with laboratory nutrient additions, revealed that this flux appears to be driven primarily by sediment denitrification. Additionally, N2O uptake was most responsive to dissolved inorganic nitrogen with phosphorus (DINþDIP) addition, suggesting that the N2O consumption process may be P limited. Furthermore, nutrient addition experiments suggest that dissimilatory nitrate reduction to ammonium (DNRA) releases N2O at the highest levels of nitrate fertilization. Our findings indicate that tidal flats are important sinks of N2O, potentially capable of offsetting the release of this potent greenhouse gas by other, nearby ecosystems.
PIE LTER year 2013, 15 minute measurements of dissolved oxygen, water temperature in a small headwater stream draining draining a mainly forested catchment (55% forest + 19% wetland), Cart Cr., Newbury, MA.
Year 2013, continuous measurements every 15 minutes were made of dissolved oxygen, water temperature in Cart Creek, Newbury, MA, a small headwater stream draining a mainly forested catchment (55% forest + 19% wetland) in the Parker River watershed.
PIE LTER year 2014, 15 minute measurements of dissolved oxygen, water temperature in a small headwater stream draining draining a mainly forested catchment (55% forest + 19% wetland), Cart Cr., Newbury, MA.
Year 2014, continuous measurements every 15 minutes were made of dissolved oxygen, water temperature in Cart Creek, Newbury, MA, a small headwater stream draining a mainly forested catchment (55% forest + 19% wetland) in the Parker River watershed.
PIE LTER year 2015, 15 minute measurements of dissolved oxygen, water temperature in a small headwater stream draining draining a mainly forested catchment (55% forest + 19% wetland), Cart Cr., Newbury, MA.
Year 2015, continuous measurements every 15 minutes were made of dissolved oxygen, water temperature in Cart Creek, Newbury, MA, a small headwater stream draining a mainly forested catchment (55% forest + 19% wetland) in the Parker River watershed.
PIE LTER Year 2015, 15 minute measurements of dissolved oxygen, water temperature at the Ipswich River head of tide, Sylvania Dam in Ipswich, MA.
Year 2015, continuous measurements, every 15 minutes were made of dissolved oxygen, water temperature in the Ipswich River behind the head of tide Sylvania Dam in Ipswich, MA.
Forecasts, score summary files, target observational data and meteorological driver files to accompany the manuscript "Skill of process-based forecasts relative to multiple null models varies across time and depth for water temperature and dissolved oxygen"
<p>This data publication includes raw ensemble forecast output (forecasts.zip), as well as summary score files (scores.zip) for process-based forecasts produced with the Forecasting Lake and Reservoir Ecosystems (FLARE) framework. In addition, it includes scores for climatology (climatology_scores.csv) and random walk (RW_scores.csv) null forecasts, formatted observational data of target variables (sunp-targets-insitu.csv), and meteorological driver files required for analysis to accompany the manuscript "Skill of process-based forecasts relative to multiple null models varies across time and depth for water temperature and dissolved oxygen". Forecasts were made of water temperature and dissolved oxygen at Lake Sunapee, NH in 2021 and 2022.</p>
Data from: Interplay between wind-driven advection and mixing of salt and dissolved oxygen in a microtidal estuary
<p>Most work on how estuarine dynamics impact dissolved oxygen (DO) distributions has focused on tides as the primary mixing mechanism, but in shallow estuaries with large fetch or small tides, wind can be the primary mixing agent and also drives advection. To investigate how these processes interact and affect DO distributions, an observational study was conducted in the shallow, micro-tidal Neuse Estuary (NRE). Salinity, DO, and velocity profiles were measured at multiple positions along and across the estuary over a 6-month period. A one-dimensional model (General Ocean Turbulence Model) provided additional insight into the response of salinity and DO to wind. Salinity and oxygen conservation equation terms were calculated from observations and simulations to investigate the roles of advection and mixing under different conditions. Cross-estuary wind drove lateral circulations and tilted the isohalines, reducing stratification; lateral advection and enhanced vertical mixing reduced vertical gradients and increased the bottom DO. Down-estuary wind tended to increase the exchange flow and increase stratification, but concurrently the wind-driven surface turbulent boundary layer deepened over time. The balance of these processes determined if the water column became fully mixed or remained stratified, and the depth of the pycnocline and oxycline. Up-estuary wind inhibited the exchange flow and ultimately the combination of advection and vertical mixing homogenized the water column. While these patterns generally held for purely across- or along-channel wind, the response was often more complex because the wind vector could have any orientation and wind speed and direction varied continuously with time.</p>
Oxygen availability regulates the quality of soil dissolved organic matter by mediating microbial metabolism and iron oxidation
<p>Dissolved organic matter (DOM) plays a vital role in biogeochemical processes and in determining the responses of soil organic matter (SOM) to global change. Although the quantity of soil DOM has been inventoried across diverse spatio-temporal scales, the underlying mechanisms accounting for variability in DOM dynamics remain unclear, especially in upland ecosystems. Here, a gradient of SOM storage across twelve croplands in northeast China was used to understand links between DOM dynamics, microbial metabolism, and abiotic conditions. We assessed the composition, biodegradability and key biodegradable components of DOM. In addition, SOM and mineral-associated organic matter (MAOM) composition, soil enzyme activities, oxygen availability, soil texture, iron (Fe), Fe-bound organic matter and nutrient concentrations were quantified to clarify the drivers of DOM quality (composition and biodegradability). The proportion of biodegradable DOM increased exponentially with decreasing initial DOM concentration due to larger fractions of depolymerized DOM that was rich in small-molecular phenols and proteinaceous components. Unexpectedly, the composition of DOM was decoupled from that of SOM or MAOM, but significantly related to enzymatic properties. These results indicate that microbial metabolism exhibited a dominant role in DOM generation. As DOM concentration declined, increased soil oxygen availability regulated DOM composition and enhanced its biodegradability mainly through mediating microbial metabolism and Fe oxidation. The oxygen-induced oxidation of Fe(II) to Fe(III) removed complex DOM compounds with large molecular weight. Moreover, increased oxygen availability stimulated oxidase-catalyzed depolymerization of aromatic substances, and promoted production of protein-like DOM components due to lower enzymatic C/N acquisition ratio. As global changes in temperature and moisture will have large impacts on soil oxygen availability, the role of oxygen in regulating DOM dynamics highlights the importance of integrating soil oxygen supply with microbial metabolism and Fe redox status to improve model predictions of soil carbon under climate change.</p>
Data for: Beyond signal quality: The value of unmaintained pH, dissolved oxygen, and oxidation-reduction potential sensors for remote performance monitoring of on-site sequencing batch reactors
<p>Sensor maintenance is time-consuming and is a bottleneck for monitoring on-site wastewater treatment systems. Hence, we compare maintained and unmaintained sensors to monitor the biological performance of a small-scale sequencing batch reactor (SBR). The sensor types are ion-selective pH, optical dissolved oxygen (DO), and oxidation-reduction potential (ORP) with platinum electrode. We created soft sensors using engineered features: ammonium valley for pH, oxidation ramp for DO, and nitrite ramp for the ORP. Four soft sensors based on unmaintained pH sensors correctly identified the completion of the ammonium oxidation (89 to 91 out of 107 cycles), about as many times as soft sensors based on a maintained pH sensor (91 out of 107 cycles). In contrast, the DO soft sensor using data from a maintained sensor showed slightly better (89 out of 96 cycles) detection performance than that using data from two unmaintained sensors (77, respectively 82 out of 96 correct). Furthermore, the DO soft sensor using maintained data is much less sensitive to the optimisation of cut-off frequency and slope tolerance than the soft sensor using unmaintained data. The nitrite ramp provided no useful information on the state of nitrite oxidation, so no comparison of maintained and unmaintained ORP sensors was possible in this case. We identified two hurdles when designing soft sensors for unmaintained sensors: i) Sensors' type- and design-specific deterioration affects performance. ii) Feature engineering for soft sensors is sensor type specific, and the outcome is strongly influenced by operational parameters such as the aeration rate. In summary, the results with the provided soft sensors show that frequent sensor maintenance is not necessarily needed to monitor the performance of SBRs. Without sensor maintenance monitoring smalls-scale SBRs becomes practicable, which could improve the reliability of unstaffed on-site treatment systems substantially.</p>
Figure An1. Distribution of salinity (a), temperature (b), dissolved oxygen (c), and AOU (d). in Phytoplankton assemblages under hydrochemical conditions of the Volga River Delta
Figure An1. Distribution of salinity (a), temperature (b), dissolved oxygen (c), and AOU (d).
Data of the effects of temperature and dissolved oxygen on thermal biology and aerobic metabolism of tropical Callinectes sapidus crabs
<p>This file contains raw data on the effects of temperature and dissolved oxygen on several aspects of the physiology of the Callinectes sapidus tropical population. </p> <p>I. Data on thermal biology includes the effects of acclimation temperatures on 1) Preferred temperature; 2) Critical thermal minima and maxima; 3) Thermal safety margin (TSM); Thermal metabolic scope (TMS).</p> <p>II. Data on the combined effects of temperature and dissolved oxygen on routine oxygen consumption of C. sapidus. </p> <p>Those data was sent as a scientific paper to the Journal of Thermal Biology. </p> <p> </p>
Data for Seasonal Modulation of Dissolved Oxygen in the Equatorial Pacific by Tropical Instability Vortices
<p>This repository contains data used for the Analysis of "Seasonal Modulation of Dissolved Oxygen in the Equatorial Pacific by Tropical Instability Vortices" By Eddebbar et al. Submitted to JGR Oceans.</p> <p>Code used for the analysis of CESM-HR and CESM-LR model outputs and running and analyzing the particle tracking simulations are available at Zenodo on https://zenodo.org/record/5266337</p> <p>This repository contains the following items: </p> <ol> <li> Observational datasets used for model validation Figure 1 and 2 (obs.tar.gz) </li> <li>Low Resolution CESM outputs used for model resolution comparison Figure 1-3 (CESM_LR.tar.gz)</li> <li>High resolution CESM climatological output (CESM_HR_CLM.tar.gz and CESM_HR_CLM_all.tar.gz)</li> <li>Physical and BGC outputs from high resolution CESM from snapshot for Oct, 03, 0005 (CESM-HR_BGC.0005-10-03.tar.gz and CESM_HR_0005_10_03.tar.gz) used in Fig 3, 4, 5, 6, and 9 and Supp Fig 3.</li> <li>Outputs for year 5 of simulation for select variables from CESM-HR (CESM_HR_0005.tar.gz)</li> <li>Model Grid file: CESM_HR_grid.tar.gz</li> <li>Output for month 8, 9, 10, and 11 of year 5 of CESM-HR simulation used in figure 10, 11, and 12 for select variables including: CESM_HR_HMXL_08_09.tar.gz, CESM_HR_HMXL_10_11.tar.gz, CESM_HR_O2_08_09.tar.gz, CESM_HR_O2_10_11.tar.gz, CESM_HR_PD_08_09.tar.gz, CESM_HR_PD_10_11.tar.gz, CESM_HR_SSH_08_09.tar.gz, CESM_HR_SSH_10_11.tar.gz, CESM_HR_STF_O2_10_11.tar.gz, CESM_HR_TEMP_08_09.tar.gz, CESM_HR_TEMP_10_11.tar.gz, CESM_HR_UVEL_08_09.tar.gz)</li> <li>Near surface (15m) meridional and zonal velocity for the full CESM-HR simulation (CESM_HR_UV.tar.gz) for Fig 7</li> <li>Integrated O2 budget terms for CESM-HR (CESM_HR_O2_budget.tar.gz) used in figure 8</li> <li>Monthly mean O2 and PD (CESM_HR_O2_mon.tar.gz and CESM_HR_PD_mon.tar.gz) for Fig 7</li> <li>Particle trajectories for forward and backward parcels simulations used in fig 10-12 (particle_tracking_bwd_.tar.gz and particle_tracking_fwd_.tar.gz)</li> </ol>
Dataset for 'Effects of bubble plumes on lake dynamics, near-bottom turbulence, and transfer of dissolved oxygen at the sediment-water interface'
<p>The dataset associated with the article "Effects of bubble plumes on lake dynamics, near-bottom turbulence, and transfer of dissolved oxygen at the sediment-water interface". </p>
Data from: Century-scale changes in temperature, salinity, and dissolved oxygen in Puget Sound
Open the record for dataset details and reuse information.
Data from: Interplay between wind-driven advection and mixing of salt and dissolved oxygen in a microtidal estuary
Open the record for dataset details and reuse information.
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