scholarly journals Modeling Global Riverine DOC Flux Dynamics From 1951 to 2015

2019 ◽  
Vol 11 (2) ◽  
pp. 514-530 ◽  
Author(s):  
Mingxu Li ◽  
Changhui Peng ◽  
Xiaolu Zhou ◽  
Yanzheng Yang ◽  
Yanrong Guo ◽  
...  
Keyword(s):  
Flux Dynamics ◽  
Doc Flux

scholarly journals Flux dynamics at the groundwater-surface water interface in a tropical catchment

Limnologica ◽  
2018 ◽  
Vol 68 ◽  
pp. 36-45 ◽  
Author(s):  
Hai Manh Vu ◽  
Margaret Shanafield ◽  
Okke Batelaan
Keyword(s):  
Surface Water ◽  
Water Interface ◽  
Flux Dynamics

scholarly journals Particle concentration and flux dynamics in the atmospheric boundary layer as the indicator of formation mechanism

2011 ◽  
Vol 11 (12) ◽  
pp. 5591-5601 ◽  
Author(s):  
J. Lauros ◽  
A. Sogachev ◽  
S. Smolander ◽  
H. Vuollekoski ◽  
S.-L. Sihto ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Formation Mechanism ◽  
Turbulent Transport ◽  
Particle Formation ◽  
Formation Mechanisms ◽  
Forest Site ◽  
Aerosol Formation ◽  
Flux Dynamics ◽  
Layer Deposition

Abstract. We carried out column model simulations to study particle fluxes and deposition and to evaluate different particle formation mechanisms at a boreal forest site in Finland. We show that kinetic nucleation of sulphuric acid cannot be responsible for new particle formation alone as the simulated vertical profile of particle number concentration does not correspond to observations. Instead organic induced nucleation leads to good agreement confirming the relevance of the aerosol formation mechanism including organic compounds emitted by the biosphere. The simulation of aerosol concentration within the atmospheric boundary layer during nucleation event days shows a highly dynamical picture, where particle formation is coupled with chemistry and turbulent transport. We have demonstrated the suitability of our turbulent mixing scheme in reproducing the most important characteristics of particle dynamics within the boundary layer. Deposition and particle flux simulations show that deposition affects noticeably only the smallest particles in the lowest part of the atmospheric boundary layer.

scholarly journals Carbon budget estimation of a subarctic catchment using a dynamic ecosystem model at high spatial resolution

2015 ◽  
Vol 12 (9) ◽  
pp. 2791-2808 ◽  
Author(s):  
J. Tang ◽  
P. A. Miller ◽  
A. Persson ◽  
D. Olefeldt ◽  
P. Pilesjö ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Carbon Budget ◽  
High Spatial Resolution ◽  
Carbon Sink ◽  
Carbon Fluxes ◽  
Ecosystem Model ◽  
Carbon Exchange ◽  
Arctic Ecosystems ◽  
Flux Dynamics ◽  
Ecosystem Responses

Abstract. A large amount of organic carbon is stored in high-latitude soils. A substantial proportion of this carbon stock is vulnerable and may decompose rapidly due to temperature increases that are already greater than the global average. It is therefore crucial to quantify and understand carbon exchange between the atmosphere and subarctic/arctic ecosystems. In this paper, we combine an Arctic-enabled version of the process-based dynamic ecosystem model, LPJ-GUESS (version LPJG-WHyMe-TFM) with comprehensive observations of terrestrial and aquatic carbon fluxes to simulate long-term carbon exchange in a subarctic catchment at 50 m resolution. Integrating the observed carbon fluxes from aquatic systems with the modeled terrestrial carbon fluxes across the whole catchment, we estimate that the area is a carbon sink at present and will become an even stronger carbon sink by 2080, which is mainly a result of a projected densification of birch forest and its encroachment into tundra heath. However, the magnitudes of the modeled sinks are very dependent on future atmospheric CO2 concentrations. Furthermore, comparisons of global warming potentials between two simulations with and without CO2 increase since 1960 reveal that the increased methane emission from the peatland could double the warming effects of the whole catchment by 2080 in the absence of CO2 fertilization of the vegetation. This is the first process-based model study of the temporal evolution of a catchment-level carbon budget at high spatial resolution, including both terrestrial and aquatic carbon. Though this study also highlights some limitations in modeling subarctic ecosystem responses to climate change, such as aquatic system flux dynamics, nutrient limitation, herbivory and other disturbances, and peatland expansion, our study provides one process-based approach to resolve the complexity of carbon cycling in subarctic ecosystems while simultaneously pointing out the key model developments for capturing complex subarctic processes.

scholarly journals Flux dynamics and avalanches in the 122 pnictide superconductor Ba0.65Na0.35Fe2As2

2013 ◽  
Vol 25 (49) ◽  
pp. 495701 ◽  
Author(s):  
A K Pramanik ◽  
S Aswartham ◽  
A U B Wolter ◽  
S Wurmehl ◽  
V Kataev ◽  
...  
Keyword(s):  
Flux Dynamics

Magnetic properties of two-dimensional Josephson networks: Self-organized criticality in magnetic flux dynamics

JETP Letters ◽  
2000 ◽  
Vol 72 (1) ◽  
pp. 26-29 ◽  
Author(s):  
S. M. Ishikaev ◽  
É. V. Matizen ◽  
V. V. Ryazanov ◽  
V. A. Oboznov ◽  
A. V. Veretennikov
Keyword(s):  
Magnetic Properties ◽  
Magnetic Flux ◽  
Two Dimensional ◽  
Flux Dynamics ◽  
Self Organized ◽  
Self Organized Criticality

scholarly journals DOC sources and DOC transport pathways in a small headwater catchment as revealed by carbon isotope fluctuation during storm events

2014 ◽  
Vol 11 (11) ◽  
pp. 3043-3056 ◽  
Author(s):  
T. Lambert ◽  
A.-C. Pierson-Wickmann ◽  
G. Gruau ◽  
A. Jaffrezic ◽  
P. Petitjean ◽  
...  
Keyword(s):  
High Resolution ◽  
High Flow ◽  
Published Data ◽  
Storm Events ◽  
Transport Pathways ◽  
Relative Contribution ◽  
Temporal And Spatial ◽  
High Flow Period ◽  
Doc Flux ◽  
Headwater Catchment

Abstract. Monitoring the isotopic composition (δ13CDOC) of dissolved organic carbon (DOC) during flood events can be helpful for locating DOC sources in catchments and quantifying their relative contribution to stream DOC flux. High-resolution (< hourly basis) δ13CDOC data were obtained during six successive storm events occurring during the high-flow period in a small headwater catchment in western France. Intra-storm δ13CDOC values exhibit a marked temporal variability, with some storms showing large variations (> 2 ‰), and others yielding a very restricted range of values (< 1 ‰). Comparison of these results with previously published data shows that the range of intra-storm δ13CDOC values closely reflects the temporal and spatial variation in δ13CDOC observed in the riparian soils of this catchment during the same period. Using δ13CDOC data in conjunction with hydrometric monitoring and an end-member mixing approach (EMMA), we show that (i) > 80% of the stream DOC flux flows through the most superficial soil horizons of the riparian domain and (ii) the riparian soil DOC flux is comprised of DOC coming ultimately from both riparian and upland domains. Based on its δ13C fingerprint, we find that the upland DOC contribution decreases from ca.~30% of the stream DOC flux at the beginning of the high-flow period to < 10% later in this period. Overall, upland domains contribute significantly to stream DOC export, but act as a size-limited reservoir, whereas soils in the wetland domains act as a near-infinite reservoir. Through this study, we show that δ13CDOC provides a powerful tool for tracing DOC sources and DOC transport mechanisms in headwater catchments, having a high-resolution assessment of temporal and spatial variability.

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