scholarly journals Methane Emissions From the Salt Marshes of Doñana Wetlands: Spatio-Temporal Variability and Controlling Factors

2019 ◽  
Vol 7 ◽  
Author(s):  
I. Emma Huertas ◽  
Mercedes de la Paz ◽  
Fiz F. Perez ◽  
Gabriel Navarro ◽  
Susana Flecha
Keyword(s):  
Salt Marshes ◽  
Temporal Variability ◽  
Methane Emissions ◽  
Controlling Factors ◽  
Spatio Temporal

Spatio-temporal variability of carbon dioxide and methane emissions from a Mediterranean reservoir

Limnetica ◽  
2022 ◽  
Vol 41 (1) ◽  
pp. 43-60
Author(s):  
J. J. Montes-Pérez ◽  
B. Obrador ◽  
T. Conejo-Orosa ◽  
V. Rodríguez ◽  
R. Marcé ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Temporal Variability ◽  
Methane Emissions ◽  
Mediterranean Reservoir ◽  
Spatio Temporal

scholarly journals How effective is information on soil-landscape units for determining spatio-temporal variability of near-surface soil moisture?

2018 ◽  
Vol 49 (3) ◽  
pp. 174-182 ◽  
Author(s):  
Paolo Nasta ◽  
Benedetto Sica ◽  
Caterina Mazzitelli ◽  
Paola Di Fiore ◽  
Ugo Lazzaro ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Temporal Variability ◽  
Surface Soil ◽  
Controlling Factors ◽  
Surface Soil Moisture ◽  
Near Surface ◽  
Soil Landscape ◽  
Spatio Temporal ◽  
Landscape Units ◽  
Mapping Units

In the last decades, a growing interest in fostering advanced interdisciplinary studies is leading to the establishment of observatories in pilot catchments for long-term monitoring of hydrological variables and fluxes. Nevertheless prior to sensor network installation, this investment necessitates preliminary surveys on key-variables such as near-surface soil moisture in order to prevent risks of erronously distributing sensors by missing sufficient spatial information for understanding hydrological processes within the landatmosphere interactions. The availability of maps describing areas with similar morphological, topographical, soil, and vegetation characteristics enable preliminary surveys to be organized for capturing spatio-temporal variability of soil moisture as best as possible. The soil-landscape classification can be considered as an interesting approach for grouping mapping units with similar hydrological behavior. Therefore, we assume the soil-landscape units as hydrotopes or hydrological similar units. Six transects were established along two hillsides of the Upper Alento River catchment (southern Italy) which is a proper candidate to become a Critical Zone Observatory. In this paper we use a soil-landscape map to infer spatial and temporal dynamics of soil moisture measured along these transects, whereas quantitative analyses were obtained by using multivariate techniques. The effectiveness of available information on soil-landscape mapping units is evaluated with respect to different observed patterns of soil moisture: wetter- and drier-than average observation points belong to agricultural and forested hillslopes, respectively. Soil texture and topographical controlling factors, especially clay content and slope gradient, are found to explain approximately 70% of the observed spatial variations in soil moisture along the forested hillslopes. The spatial structure explained by the environmental controlling factors decreases to 45% in the cases of the agricultural hillslopes mainly due to perturbations induced by grazing and tillage practices.

Emissions of methane from temperate artificial reservoirs – what is already known

2020 ◽  
Author(s):  
Jaroslava Frouzova ◽  
Jan Bašta
Keyword(s):  
Temporal Variability ◽  
Uniform Design ◽  
Methane Emissions ◽  
Limited Attention ◽  
Reservoir Properties ◽  
Good Tool ◽  
Factors Affecting ◽  
Spatio Temporal ◽  
Artificial Reservoirs ◽  
Critical Resources

<p>Methane is assumed to belong to the most  important greenhouse gases, however factors affecting methane production and emission are still not satisfactory elucidated. Artificial reservoirs which are critical resources to obtain water and hydropover in many countries are  one of the methane sources which received only limited attention so far.   We reviewed existing information about methane emissions from them.  Emissions  are combination of diffusion, ebullition and degassing under dam, but not all pathway must be presented. Nineteen studies, mainly from North America and Europe were compared, Only small portion of the studies was focusing on all pathways of methane release. Spatio-temporal variability, which is especially high for ebullition (ebullition is probably responsible for the most of the methane emissions), was covered in 3 reservoirs only. For this purposes is newly used acoustical method good tool, hydroacoustics cover mainly spatial variability of ebullition, which is poorly couth by traditional bubble traps. The most of the  studies was performed in summer period only and for low number of localities.  Future studies should use more uniform design covering better all potential pathway of methane emissions and  taking care of spatio-temporal variability of ebullition.  More systematic studies covering effect of climate and landscape variables as well as reservoir properties (morphology management etc.) are needed.</p>

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