scholarly journals Distribution of black carbon in Ponderosa pine litter and soils following the High Park wildfire

2014 ◽  
Vol 11 (12) ◽  
pp. 16799-16824 ◽  
Author(s):  
C. M. Boot ◽  
M. Haddix ◽  
K. Paustian ◽  
M. F. Cotrufo
Keyword(s):  
Carbon Cycle ◽  
Black Carbon ◽  
Ponderosa Pine ◽  
Land Surface ◽  
Global Carbon Cycle ◽  
Soil Layers ◽  
C Stocks ◽  
Future Work ◽  
Global Carbon ◽  
Black Carbon Content

Abstract. Black carbon (BC), the heterogeneous product of burned biomass, is a critical component in the global carbon cycle, yet timescales and mechanisms for incorporation into the soil profile are not well understood. The High Park Fire, which took place in northwestern Colorado in the summer of 2012, provided an opportunity to study the effects of both fire intenstiy and geomorphology on properties of carbon (C), nitrogen (N), and BC in the Cache La Poudre River drainage. We sampled montane Ponderosa pine litter, 0–5 cm soils, and 5–15 cm soils four months post-fire in order to examine the effects of slope and burn intensity on %C, C stocks, %N and black carbon (g kg−1 C, and g m−2). We developed and implemented the benzene polycarboxylic acid (BPCA) method for quantifying BC. With regard to slope, we found that steeper slopes had higher C : N than shallow slopes, but that there was no difference in black carbon content or stocks. BC content was greatest in the litter in burned sites (19 g kg−1 C), while BC stocks were greatest in the 5–15 cm subsurface soils (23 g m−2). At the time of sampling, none of the BC deposited on the land surface post-fire had been incorporated into to either the 0–5 cm or 5–15 cm soil layers. The ratio of B5CA : B6CA (less condensed to more condensed BC) indicated there was significantly more older, more processed BC at depth. Total BC soil stocks were relatively low compared to other fire-prone grassland and boreal forest systems, indicating most of the BC produced in this system is likely transported off the surface through erosion events. Future work examining mechanisms for BC transport will be required for understanding the role BC plays in the global carbon cycle.

Black carbon formation by savanna fires: Measurements and implications for the global carbon cycle

1996 ◽  
Vol 101 (D19) ◽  
pp. 23651-23665 ◽  
Author(s):  
T. A. J. Kuhlbusch ◽  
M. O. Andreae ◽  
H. Cachier ◽  
J. G. Goldammer ◽  
J.-P. Lacaux ◽  
...  
Keyword(s):  
Carbon Cycle ◽  
Black Carbon ◽  
Global Carbon Cycle ◽  
Carbon Formation ◽  
Savanna Fires ◽  
Global Carbon

scholarly journals Distribution of black carbon in ponderosa pine forest floor and soils following the High Park wildfire

2015 ◽  
Vol 12 (10) ◽  
pp. 3029-3039 ◽  
Author(s):  
C. M. Boot ◽  
M. Haddix ◽  
K. Paustian ◽  
M. F. Cotrufo
Keyword(s):  
Black Carbon ◽  
Ponderosa Pine ◽  
Land Surface ◽  
Forest Floor ◽  
Fire Severity ◽  
Soil Layer ◽  
Pine Forest ◽  
Selective Degradation ◽  
C Stocks ◽  
Ponderosa Pine Forest

Abstract. Biomass burning produces black carbon (BC), effectively transferring a fraction of the biomass C from an actively cycling pool to a passive C pool, which may be stored in the soil. Yet the timescales and mechanisms for incorporation of BC into the soil profile are not well understood. The High Park fire (HPF), which occurred in northwestern Colorado in the summer of 2012, provided an opportunity to study the effects of both fire severity and geomorphology on properties of carbon (C), nitrogen (N) and BC in the Cache La Poudre River drainage. We sampled montane ponderosa pine forest floor (litter plus O-horizon) and soils at 0–5 and 5–15 cm depth 4 months post-fire in order to examine the effects of slope and burn severity on %C, C stocks, %N and BC. We used the benzene polycarboxylic acid (BPCA) method for quantifying BC. With regard to slope, we found that steeper slopes had higher C : N than shallow slopes but that there was no difference in BPCA-C content or stocks. BC content was greatest in the forest floor at burned sites (19 g BPCA-C kg−1 C), while BC stocks were greatest in the 5–15 cm subsurface soils (23 g BPCA-C m−2). At the time of sampling, unburned and burned soils had equivalent BC content, indicating none of the BC deposited on the land surface post-fire had been incorporated into either the 0–5 or 5–15 cm soil layers. The ratio of B6CA : total BPCAs, an index of the degree of aromatic C condensation, suggested that BC in the 5–15 cm soil layer may have been formed at higher temperatures or experienced selective degradation relative to the forest floor and 0–5 cm soils. Total BC soil stocks were relatively low compared to other fire-prone grassland and boreal forest systems, indicating most of the BC produced in this system is likely lost, either through erosion events, degradation or translocation to deeper soils. Future work examining mechanisms for BC losses from forest soils will be required for understanding the role BC plays in the global carbon cycle.

scholarly journals Glacial weathering, sulfide oxidation, and global carbon cycle feedbacks

2017 ◽  
Vol 114 (33) ◽  
pp. 8716-8721 ◽  
Author(s):  
Mark A. Torres ◽  
Nils Moosdorf ◽  
Jens Hartmann ◽  
Jess F. Adkins ◽  
A. Joshua West
Keyword(s):  
Carbon Cycle ◽  
Chemical Weathering ◽  
Dissolved Inorganic Carbon ◽  
Global Climate ◽  
Sulfide Oxidation ◽  
Global Carbon Cycle ◽  
Hydrochemical Data ◽  
Future Work ◽  
Global Carbon

Connections between glaciation, chemical weathering, and the global carbon cycle could steer the evolution of global climate over geologic time, but even the directionality of feedbacks in this system remain to be resolved. Here, we assemble a compilation of hydrochemical data from glacierized catchments, use this data to evaluate the dominant chemical reactions associated with glacial weathering, and explore the implications for long-term geochemical cycles. Weathering yields from catchments in our compilation are higher than the global average, which results, in part, from higher runoff in glaciated catchments. Our analysis supports the theory that glacial weathering is characterized predominantly by weathering of trace sulfide and carbonate minerals. To evaluate the effects of glacial weathering on atmospheric pCO2, we use a solute mixing model to predict the ratio of alkalinity to dissolved inorganic carbon (DIC) generated by weathering reactions. Compared with nonglacial weathering, glacial weathering is more likely to yield alkalinity/DIC ratios less than 1, suggesting that enhanced sulfide oxidation as a result of glaciation may act as a source of CO2 to the atmosphere. Back-of-the-envelope calculations indicate that oxidative fluxes could change ocean–atmosphere CO2 equilibrium by 25 ppm or more over 10 ky. Over longer timescales, CO2 release could act as a negative feedback, limiting progress of glaciation, dependent on lithology and the concentration of atmospheric O2. Future work on glaciation–weathering–carbon cycle feedbacks should consider weathering of trace sulfide minerals in addition to silicate minerals.

Black Carbon from the Mississippi River:  Quantities, Sources, and Potential Implications for the Global Carbon Cycle

2002 ◽  
Vol 36 (11) ◽  
pp. 2296-2302 ◽  
Author(s):  
Siddhartha Mitra ◽  
Thomas S. Bianchi ◽  
Brent A. McKee ◽  
Martha Sutula
Keyword(s):  
Carbon Cycle ◽  
Black Carbon ◽  
Mississippi River ◽  
Global Carbon Cycle ◽  
Global Carbon

Are response function representations of the global carbon cycle ever interpretable?

Tellus B ◽  
2009 ◽  
Vol 61 (2) ◽  
Author(s):  
Sile Li ◽  
Andrew J. Jarvis ◽  
David T. Leedal
Keyword(s):  
Carbon Cycle ◽  
Response Function ◽  
Global Carbon Cycle ◽  
Global Carbon

EPR-derived structures of flavin radical and iron-sulfur clusters from Methylosinus sporium 5 reductase

2021 ◽  
Author(s):  
Han Sol Jeong ◽  
Sugyeong Hong ◽  
Hee Seon Yoo ◽  
Jin Kim ◽  
Yujeong Kim ◽  
...  
Keyword(s):  
Carbon Cycle ◽  
Crucial Role ◽  
Methane Monooxygenase ◽  
Global Carbon Cycle ◽  
Ambient Conditions ◽  
Iron Sulfur Clusters ◽  
Iron Sulfur ◽  
Greenhouse Effects ◽  
Global Carbon ◽  
Significant Attention

Methane monooxygenase (MMO) has attracted significant attention owing to its crucial role in the global carbon cycle; it impedes greenhouse effects by converting methane to methanol under ambient conditions. The...

scholarly journals Amazonian Fire Events Disturbed the Global Carbon Cycle: A Study from 2019 Amazon Wildfire Using Google Earth Engine

2020 ◽  
Vol 3 (1) ◽  
pp. 43
Author(s):  
Subhajit Bandopadhyay ◽  
Dany A. Cotrina Sánchez
Keyword(s):  
Carbon Cycle ◽  
Carbon Sink ◽  
Brazilian Amazon ◽  
Global Carbon Cycle ◽  
Forest Productivity ◽  
Google Earth ◽  
Comparative Approach ◽  
Burned Area ◽  
Google Earth Engine ◽  
Global Carbon

An unprecedented number of wildfire events during 2019 throughout the Brazilian Amazon caught global attention, due to their massive extent and the associated loss in the Amazonian forest—an ecosystem on which the whole world depends. Such devastating wildfires in the Amazon has strongly hampered the global carbon cycle and significantly reduced forest productivity. In this study, we have quantified such loss of forest productivity in terms of gross primary productivity (GPP), applying a comparative approach using Google Earth Engine. A total of 12 wildfire spots have been identified based on the fire’s extension over the Brazilian Amazon, and we quantified the loss in productivity between 2018 and 2019. The Moderate Resolution Imaging Spectroradiometer (MODIS) GPP and MODIS burned area satellite imageries, with a revisit time of 8 days and 30 days, respectively, have been used for this study. We have observed that compared to 2018, the number of wildfire events increased during 2019. But such wildfire events did not hamper the natural annual trend of GPP of the Amazonian ecosystem. However, a significant drop in forest productivity in terms of GPP has been observed. Among all 11 observational sites were recorded with GPP loss, ranging from −18.88 gC m−2 yr−1 to −120.11 gC m−2 yr−1, except site number 3. Such drastic loss in GPP indicates that during 2019 fire events, all of these sites acted as carbon sources rather than carbon sink sites, which may hamper the global carbon cycle and terrestrial CO2 fluxes. Therefore, it is assumed that these findings will also fit for the other Amazonian wildfire sites, as well as for the tropical forest ecosystem as a whole. We hope this study will provide a significant contribution to global carbon cycle research, terrestrial ecosystem studies, sustainable forest management, and climate change in contemporary environmental sciences.

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