Enrique P. Sánchez‐Cañete

Universidad de Granada

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Andrew S. Kowalski

Instituto Andaluz de Ciencias de la Tierra

Penélope Serrano‐Ortiz

Universidad de Granada

Francisco Domingo

Consejo Superior de Investigaciones Científicas

Ana López‐Ballesteros

Centro de Investigación y Tecnología Agroalimentaria de Aragón

Cecilio Oyonarte

University of Almería

Russell L. Scott

Southwest Watershed Research Center

G. Barron-Gafford

University of Arizona

Sergio Aranda-Barranco

Instituto Andaluz de Ciencias de la Tierra

ÓP

Óscar Pérez‐Priego

University of Córdoba

Clément López-Canfín

University of Delaware

Cooperative Institutions

University of California, Berkeley

Universidad de Granada

University of Nebraska–Lincoln

University of Arizona

University of Helsinki

Northern Arizona University

Centre National de la Recherche Scientifique

Finnish Meteorological Institute

Chinese Academy of Sciences

Lawrence Berkeley National Laboratory

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Patterns in CO2 exchange to the atmosphere from a borehole located in a Mediterranean karst system (Málaga, southern Spain)

Enrique P. Sánchez‐Cañete J. Benavente Cristina Liñán Baena Lucía Ojeda Iñaki Vadillo

The vadose zone (VZ), found between the surface and groundwater level, can store massive amounts of CO2, recording values greater than 60,000 ppm to depths of a few tens of meters. The CO2 is produced mostly in the first meters of soil due to root respiration and microorganisms and, to a lesser extent, to geochemical reactions. Although commonly CO2 is produced mostly near the surface, the concentration increases with depth, due mainly to transport in two phases: 1) infiltration of CO2-enriched water followed by precipitation and CO2 release in deeper layers, and 2) percolation of CO2-rich air due to its high density. These transport process contribute to natural CO2 accumulation in the VZ, whose storage capacity depends on its thickness and porosity. All this CO2 storage can be exchange with the atmosphere mainly determined by differences in the temperature between the internal and external atmosphere.Here we study a borehole located next to Nerja Cave (M&#225;laga, Spain) developed within fissured and karstified Triassic dolomitic marbles. Our objective is to determine the main drivers involved in subterranean CO2 exchange with the atmosphere. To do that, CO2 molar fraction, air temperature, relative humidity, wind speed and direction were monitored in the top of the borehole, and were correlated with external variables as air temperature, relative humidity, atmospheric pressure, rain and sea tides. Results shown that within a few hours, the CO2 molar fraction can increase ten times more, showing a pattern with two cycles per day. In periods with low CO2 molar fraction the air penetrates into the borehole, on the other hand, periods with high CO2 values are due to the borehole CO2-rich air is moving toward the external atmosphere. We found that the CO2 emitted to the atmosphere by this borehole is several orders of magnitude than the soil CO2 fluxes in this area. Therefore, we need to produce accurate long-term estimates of borehole CO2 fluxes to improve our understanding of its contribution to local carbon balance.

10.5194/egusphere-egu2020-5650

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Improving soil CO 2 efflux estimates from in-situ soil CO 2 sensors with gas transport measurements

2015 AGU Fall Meeting (2015)

Enrique P. Sánchez‐Cañete G. Barron-Gafford J. L. M. Van Haren Russell L. Scott

Soil gas

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Unravelling the main mechanism responsible for nocturnal CO2 uptake by dryland soils

The Science of The Total Environment (2024)

Minsu Kim Clément López-Canfín Roberto Lázaro Enrique P. Sánchez‐Cañete Bettina Weber

Soil respiration, or CO2 efflux from soil, is a crucial component of the terrestrial carbon cycle in climate models. Contrastingly, many dryland soils absorb atmospheric CO2 at night, but the exact mechanisms driving this uptake are actively debated. Here we used a mechanistic model with heuristic approaches to unravel the underlying processes of the observed patterns of soil-atmosphere CO2 fluxes. We show that the temperature drop during nighttime is the main driver of CO2 uptake by increasing CO2 solubility and local water pH of a thin water film on soil particle surfaces, providing favourable conditions for carbonate precipitation. Our data demonstrate that the nocturnal inorganic carbon absorption is a common soil process, but often offset by biological CO2 production. The uptake rates can be impacted by different successional stages of biocrusts that consume or produce CO2 and modify the pH of the soil water film, which can be maintained by non-rainfall water inputs, such as pore space condensation. Annual estimates of nocturnal carbon uptake, based on in situ continuous measurements at the soil level in drylands are still very scarce, but fluxes of up to several tens of g C m−2 y−1 have been reported, potentially accounting for a considerable fraction of the global residual terrestrial carbon sink.

Sink (geography)

Soil respiration

Carbon sink

10.1016/j.scitotenv.2024.171751

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Subterranean CO2 dynamics are driven by air pressure fluctuations in two semi-arid grassland in SE Spain

EGUGA (2018)

María Rosario Moya Jiménez Enrique P. Sánchez‐Cañete Rodrigo Vargas Andrew S. Kowalski Penélope Serrano‐Ortiz

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Influence of land degradation on ventilation and pressure tidal effect in the CO2 exchange: Evidence from two semi-arid grasslands in the southeast of Spain

M. Rosario Moya Enrique P. Sánchez‐Cañete Andrew S. Kowalski Penélope Serrano‐Ortiz Ana López‐Ballesteros

Trabajo presentado al 9th European Society for Soil Conservation (ESSC) International Congress, celebrado en Tirana (Albania) del 26 al 28 de septiembre de 2019.

Environmental degradation

Degradation

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Author Correction: The FLUXNET2015 dataset and the ONEFlux processing pipeline for eddy covariance data

Scientific Data (2021)

Gilberto Pastorello Carlo Trotta Eleonora Canfora Housen Chu Danielle Christianson

A Correction to this paper has been published: https://doi.org/10.1038/s41597-021-00851-9.

10.1038/s41597-021-00851-9

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Spatial and temporal heterogeneity of soil respiration in a bare-soil Mediterranean olive grove

SOIL (2025)

Sergio Aranda-Barranco Penélope Serrano‐Ortiz Andrew S. Kowalski Enrique P. Sánchez‐Cañete

Abstract. Soil respiration (Rs) is an important carbon flux in terrestrial ecosystems, and knowledge about this CO2 release process and the drivers involved is a key topic in the context of global change. However, temporal and spatial variability has not been studied extensively in semi-arid systems such as olive groves. In this study, we show a full year of continuous measurements of Rs with six automatic chambers in a fertigated olive grove with bare soil in the Mediterranean accompanied by modeled ecosystem respiration (Reco) estimated by decomposing net ecosystem exchange (NEE) measured using the eddy covariance (EC) technique. To study spatial variability, the automatic chambers were distributed equally under the canopy (Rs Under-Tree) and in the center of the alley (Rs Alley), and the gradient of Rs between both locations was measured in several manual campaigns in addition to angular changes about the olive trees. The results indicate that Rs Under-Tree was 3 times higher than Rs Alley in the annual computations. Higher Rs was found on the southern face, and an exponential decay of Rs was observed until the alley's center was reached. These spatial changes were used to weigh and project Rs onto the ecosystem scale, whose annual balance was 1.6–2.3 times higher than the Reco estimated using EC-derived models. Rs Under-Tree represented 39 % of the Rs of the olive grove. We found values of Q10<1 in the vicinity of the olive tree in the warm period. Outbursts of CO2 emissions associated with precipitation events were detected, especially in the alley, during dry periods and after extended periods without rain, but they were not accurately detected by EC-derived respiration models. We point out an interaction between several effects that vary in time, that are different under the canopy than in the alleys, and that the accepted models for estimating Q10 and Reco do not consider. These results show high spatial and temporal heterogeneity in soil respiration and the factors involved, which must be considered in future works in semi-arid agroecosystems.

Soil respiration

Spatial heterogeneity

10.5194/soil-11-213-2025

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Surface-Parallel Sensor Orientation for Assessing Energy Balance Components on Mountain Slopes

Boundary-Layer Meteorology (2015)

Penélope Serrano‐Ortiz Enrique P. Sánchez‐Cañete F.J. Olmo Stefan Metzger Óscar Pérez‐Priego

Closure (psychology)

Temperature Gradient

10.1007/s10546-015-0099-4

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Citations (22)

Supplementary material to "Atmospheric turbulence triggers pronounced diel pattern in karst carbonate geochemistry"

M. Roland P. Serrano-Ortiz A. S. Kowalski Y. Goddéris Enrique P. Sánchez‐Cañete

Diel vertical migration

10.5194/bgd-10-1207-2013-supplement

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Transition Period Between Vegetation Growth and Senescence Controlling Interannual Variability of C Fluxes in a Mediterranean Reed Wetland

Journal of Geophysical Research Biogeosciences (2019)

Penélope Serrano‐Ortiz Sergio Aranda-Barranco Ana López‐Ballesteros Clément López-Canfín Enrique P. Sánchez‐Cañete

Key Points Interannual variability of C fluxes of the Mediterranean wetland mainly depends on the behavior of reed dynamics during the transition to senescence period Evapotranspiration of the Mediterranean reed wetland does not present a relevant interannual variability The role of the Mediterranean reed wetland in the global warming is determined far more by the CO 2 than the CH 4

Senescence

10.1029/2019jg005169

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Citations (4)