scholarly journals Characteristics of wet carbon deposition in a semi-arid catchment at Loess Plateau, China

2018 ◽  
Author(s):  
Linhua Wang ◽  
Haw Yen ◽  
Liding Chen ◽  
Xinhui E ◽  
Yafeng Wang
Keyword(s):  
Carbon Cycle ◽  
Loess Plateau ◽  
Large Scale ◽  
Carbon Deposition ◽  
Deposition Process ◽  
Global Carbon Cycle ◽  
Deposition Flux ◽  
Dust Deposition ◽  
Global Carbon ◽  
Semi Arid

Abstract. Wet carbon deposition is a critical node of the global carbon cycle, but little is known about dissolved organic and inorganic carbon (DOC and DIC) variation and flux in semi arid area of the Loess Plateau Region (LPR). In this study, concentration of DOC and DIC in rainfall was monitored in the period of July to September 2015 at Yangjuangou catchment in the LPR. Results showed that the Volume-Weighted Mean (VWM) concentration of DOC and DIC were 24.62 and 4.30 (July), 3.58 and 10.52 (August), 1.01 and 5.89 (September) mg C L−1. VWM concentrations of DOC and DIC for the concentrated rainy season (July–September) in the studied region were 7.06 and 7.00 mg C L−1, respectively. In addition, the monthly deposition flux of DOC and DIC were 541.64/94.60, 131.03/385.03, and 44.44/259.16 mg C m−2 for July, August and September. The estimated annual wet carbon depositions were 1.91, 1.89 g C m−2 yr−1 for DOC and DIC, which were higher than those of other sites and lower than those in the tropical and sub-tropical sites. Furthermore, the loess dust deposition process provides soil parental material in soil formation process and might be another source of carbon at the LPR. Therefore, the given results reflect characteristics of wet carbon deposition process during concentrated rainfall season in a semi-arid catchment of the LPR. Our preliminary results suggest that further investigation is needed on carbon source and deposition flux from atmosphere at long term temporal and large scale for revealing the global carbon cycle.

scholarly journals The Impact of Agricultural Soil Erosion on the Global Carbon Cycle

Science ◽  
2007 ◽  
Vol 318 (5850) ◽  
pp. 626-629 ◽  
Author(s):  
K. Van Oost ◽  
T. A. Quine ◽  
G. Govers ◽  
S. De Gryze ◽  
J. Six ◽  
...  
Keyword(s):  
Soil Erosion ◽  
Carbon Cycle ◽  
Agricultural Soil ◽  
Large Scale ◽  
Carbon Sink ◽  
Global Carbon Cycle ◽  
Agricultural Landscapes ◽  
Carbon Equivalent ◽  
The Impact ◽  
Global Carbon

Agricultural soil erosion is thought to perturb the global carbon cycle, but estimates of its effect range from a source of 1 petagram per year–1to a sink of the same magnitude. By using caesium-137 and carbon inventory measurements from a large-scale survey, we found consistent evidence for an erosion-induced sink of atmospheric carbon equivalent to approximately 26% of the carbon transported by erosion. Based on this relationship, we estimated a global carbon sink of 0.12 (range 0.06 to 0.27) petagrams of carbon per year–1resulting from erosion in the world's agricultural landscapes. Our analysis directly challenges the view that agricultural erosion represents an important source or sink for atmospheric CO2.

scholarly journals Contribution of semi-arid ecosystems to interannual variability of the global carbon cycle

Nature ◽  
2014 ◽  
Vol 509 (7502) ◽  
pp. 600-603 ◽  
Author(s):  
Benjamin Poulter ◽  
David Frank ◽  
Philippe Ciais ◽  
Ranga B. Myneni ◽  
Niels Andela ◽  
...  
Keyword(s):  
Carbon Cycle ◽  
Interannual Variability ◽  
Global Carbon Cycle ◽  
Arid Ecosystems ◽  
Global Carbon ◽  
Semi Arid

scholarly journals Characteristics of wet dissolved carbon deposition in a semi-arid catchment at the Loess Plateau, China

2018 ◽  
Vol 15 (11) ◽  
pp. 3345-3356
Author(s):  
Linhua Wang ◽  
Haw Yen ◽  
Liding Chen ◽  
Xinhui E ◽  
Yafeng Wang
Keyword(s):  
Loess Plateau ◽  
Carbon Deposition ◽  
Terrestrial Ecosystems ◽  
External Input ◽  
The Loess Plateau ◽  
Dissolved Carbon ◽  
Rainfall Season ◽  
Event Based ◽  
Global Carbon ◽  
Semi Arid

Abstract. Wet dissolved carbon deposition is a critical node of the global carbon cycle, but little is known about dissolved organic and inorganic carbon (DOC and DIC) concentrations and fluxes in the semi-arid areas of the Loess Plateau Region (LPR). In this study, we measured variations in DOC and DIC concentrations in rainfalls at Yangjuangou Ecological Restoration and Soil and Water Observatory. Rainwater samples were collected in 16 rainfall events from July to September and the event-based, monthly concentrations and fluxes of DOC and DIC were quantified. The results showed that the event-based concentrations and fluxes of DOC and DIC were highly variable, ranging from 0.56 to 28.71 mg C L−1 and from 3.47 to 17.49 mg C L−1, respectively. The corresponding event-based fluxes ranged from 0.21–258.36 mg C m−2 and from 4.12 to 42.32 mg C m−2. The monthly concentrations of DOC and DIC were 24.62 and 4.30 (July), 3.58 and 10.52 (August), and 1.01 and 5.89 (September) mg C L−1, respectively. Thus, the monthly deposition fluxes of DOC and DIC were 541.64/94.60, 131.03/385.03, and 44.44/259.16 mg C m−2 for July, August, and September, respectively. In addition, the concentrations of DOC and DIC for the concentrated rainfall season (July–September) in the studied catchment were 7.06 and 7.00 mg C L−1, respectively. The estimated annual wet dissolved carbon depositions were 1.91 and 1.89 g C m−2 yr−1 for DOC and DIC, respectively. The results of this study suggest the variation in concentrations and fluxes of DOC and DIC and explore that these variation may be related to the dissolved carbon source and the rainfall characteristics during the concentrated rainfall season in the semi-arid catchment of the LPR. Furthermore, these results also suggest that dissolved carbon may be an important external input of carbon into terrestrial ecosystems.

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.

Distribution of radiocarbon as a test of global carbon cycle models

1995 ◽  
Vol 9 (1) ◽  
pp. 153-166 ◽  
Author(s):  
Atul K. Jain ◽  
Haroon S. Kheshgi ◽  
Martin I. Hoffert ◽  
Donald J. Wuebbles
Keyword(s):  
Carbon Cycle ◽  
Global Carbon Cycle ◽  
Global Carbon
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