CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; Flux and its Relationship with Water Parameters and Biological Activity in the Ji-Paraná River (Rondônia State – Western Amazon)

Pinto, Thandy Junio da Silva; Gomes, Beatriz Machado

doi:10.5194/bg-2017-407

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…Table 2 summarizes the global averaged discharge, MARCATS segment number, and CO 2 evasion in 24 estuaries calculated using previous data (Abril & Borges, 2004; Araujo et al, 2014; Chen et al, 2013; Chen & Borges, 2009; Dinauer & Mucci, 2017; Evans et al, 2013; Huang et al, 2015; Laruelle et al, 2013; Lefèvre et al, 2017; Less et al, 2018; Li et al, 2013; Murata et al, 2008; Pavel et al, 2019; Pinto & Gomes, 2017; Sarma et al, 2011; Semiletov et al, 2012; Shen et al, 2020; Yao et al, 2007). Spring, summer, autumn, and winter fluxes are the averaged values between March–May, June–August, September–November, and December–February, respectively.…”

Section: Resultsmentioning

confidence: 96%

“…These results show that variations in carbon budget in different rivers reflect various hydrologic and biogeochemical conditions. Less et al, 2018;Li et al, 2013;Murata et al, 2008;Pavel et al, 2019;Pinto & Gomes, 2017;Sarma et al, 2011;Semiletov et al, 2012;Shen et al, 2020;Yao et al, 2007). Spring, summer, autumn, and winter fluxes are the averaged values between March-May, June-August, September-November, and December-February, respectively.…”

Section: Evaluation Of Changes In the Carbon Cycle Due To Nutrient Ad...mentioning

confidence: 99%

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Impact of anthropogenic disturbances on carbon cycle changes in terrestrial‐aquatic‐estuarine continuum by using an advanced process‐based model

Nakayama

2022

Hydrological Processes

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Recent research has shown that inland water—including rivers, lakes, and groundwater—may play some role in carbon cycling, although the extent of its contribution has remained uncertain due to the limited amount of reliable data available. To evaluate global changes in the carbon cycle due to anthropogenic factors, such as application of fertilizer and manure, in major rivers including 130 tidal estuaries over an 18‐year period (1998–2015), the present study used an advanced process‐based model derived by coupling a process‐based national integrated catchment‐based eco‐hydrology (NICE) model with various biogeochemical cycle models (NICE‐BGC). Generally, total nitrogen and phosphorus transports in overland flow were found to increase. In contrast, total suspended sediment in overland flow decreased in some regions because the vegetation was able to expand to cover the ground, resulting in less erosion. NICE‐BGC simulated the difference in carbon budget in major rivers with and without nutrient application. Generally, CO2 degassing across the water‐air interface decreased and particulate organic carbon (POC) increased in most rivers through variations in carbon budget, where excess nutrients might stimulate gross primary production of carbon‐rich algal biomass. The simulated result also showed that the estuarine carbon cycle was sensitive to intense anthropogenic disturbances reflected by nutrient load, seawater temperature, increases in sea level, and ocean acidification. Extension of previous studies only by categorizing MARgins and CATchments Segmentation (MARCATS) segment numbers showed that the estimated total CO2 flux from the world's estuaries was 0.14 Pg C/year. Generally, the simulation showed that incorporation of the nutrient cycle into the terrestrial‐aquatic‐estuarine continuum improved estimates of net land flux and carbon budget in inland waters, thus emphasizing that the effect of estuarine inland water should be explicitly included in the global carbon model to minimize the range of uncertainty.

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Section: Resultsmentioning

confidence: 96%

Section: Evaluation Of Changes In the Carbon Cycle Due To Nutrient Ad...mentioning

confidence: 99%

Impact of anthropogenic disturbances on carbon cycle changes in terrestrial‐aquatic‐estuarine continuum by using an advanced process‐based model

Nakayama

2022

Hydrological Processes

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Spatial and temporal variability of carbon dioxide and methane fluxes in an Amazonian estuary

Castellón¹,

Cattânio²,

Berrêdo³

et al. 2021

IJH

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Despite scarce information in the Amazon regions, aquatic environments in tropical mangroves are important carbon deposits, and little is known about the exchange of carbon dioxide (CO2) and methane (CH4) with the atmosphere. We used a dynamic floating chamber to measure CO2 and CH4 fluxes in different aquatic surfaces (river, bore, and stream) on a monthly basis. Water physical-chemical parameters were also measured. Daily tide level variations have influenced CH4 flux in the rainy season. The water surface in the studied Amazonian estuary was a source of CO2 and CH4 to the atmosphere, and the CO2 output was much greater in the rainy season. Their seasonal flux did not present differences among rivers, bore, and streams in the two assessed seasons, but there was monthly variation in their fluxes, which were much higher than in other studies carried out in the tropics (mean production of 3.35 Gg CO2-e y-1).

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Comparison of Post-fire Patterns in Brazilian Savanna and Tropical Forest from Remote Sensing Time Series

Santana

Júnior

Gomes

et al. 2020

IJGI

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Monitoring of fire-related changes is essential to understand vegetation dynamics in the medium and long term. Remote sensing time series allows estimating biophysical variables of terrestrial vegetation and interference by extreme fires. This research evaluated fire recurrence in the Amazon and Cerrado regions, using Moderate Resolution Imaging Spectroradiometer (MODIS) albedo time series, enhanced vegetation index (EVI), gross primary productivity (GPP), and surface temperature. The annual aggregated time series (AAT) method recognized each pixel’s slope trend in the 2001–2016 period and its statistical significance. A comparison of time trends of EVI, GPP, and surface temperature with total fire recurrence indicates that time trends in vegetation are highly affected by high fire recurrence scenarios (R2 between 0.52 and 0.90). The fire recurrence and the albedo’s persistent changes do not have a consistent relationship. Areas with the biggest evaluated changes may increase up to 0.25 Kelvin/Year at surface temperature and decrease up to −0.012 EVI/year in vegetation index. Although savannas are resistant to low severity fires, fire regime and forest structure changes tend to make vegetation more vulnerable to wildfires, reducing their regeneration capacity. In the Amazon area, protection of forests in conservation units and indigenous lands helped in the low occurrence of fires in these sensitive areas, resulting in positive vegetation index trends.

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CO<sub>2</sub> Flux and its Relationship with Water Parameters and Biological Activity in the Ji-Paraná River (Rondônia State – Western Amazon)

Cited by 3 publications

References 24 publications

Impact of anthropogenic disturbances on carbon cycle changes in terrestrial‐aquatic‐estuarine continuum by using an advanced process‐based model

Impact of anthropogenic disturbances on carbon cycle changes in terrestrial‐aquatic‐estuarine continuum by using an advanced process‐based model

Spatial and temporal variability of carbon dioxide and methane fluxes in an Amazonian estuary

Comparison of Post-fire Patterns in Brazilian Savanna and Tropical Forest from Remote Sensing Time Series

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