JournalTOCs

Biogeosciences (BG)
Journal Prestige (SJR): 2.072

Citation Impact (citeScore): 4
Number of Followers: 17

This is an Open Access Journal

Open Access journal
ISSN (Print) 1726-4170 - ISSN (Online) 1726-4189
Published by Copernicus Publications

[54 journals]

Assimilation of multiple datasets results in large differences in
regional- to global-scale NEE and GPP budgets simulated by a terrestrial
biosphere model
- Abstract: Assimilation of multiple datasets results in large differences in regional- to global-scale NEE and GPP budgets simulated by a terrestrial biosphere model
  Cédric Bacour, Natasha MacBean, Frédéric Chevallier, Sébastien Léonard, Ernest N. Koffi, and Philippe Peylin
  Biogeosciences, 20, 1089–1111, https://doi.org/10.5194/bg-20-1089-2023, 2023
  The impact of assimilating different dataset combinations on regional to global-scale C budgets is explored with the ORCHIDEE model. Assimilating simultaneously multiple datasets is preferable to optimize the values of the model parameters and avoid model overfitting. The challenges in constraining soil C disequilibrium using atmospheric CO2 data are highlighted for an accurate prediction of the land sink distribution.
  PubDate: Thu, 23 Mar 2023 04:00:01 +010
  DOI: 10.5194/bg-20-1089-2023 2023
Air–sea gas exchange in a seagrass ecosystem – results from a
3He ∕ SF6 tracer release experiment
- Abstract: Air–sea gas exchange in a seagrass ecosystem – results from a 3He ∕ SF6 tracer release experiment
  Ryo Dobashi and David T. Ho
  Biogeosciences, 20, 1075–1087, https://doi.org/10.5194/bg-20-1075-2023, 2023
  Seagrass meadows are productive ecosystems and bury much carbon. Understanding their role in the global carbon cycle requires knowledge of air–sea CO2 fluxes and hence the knowledge of gas transfer velocity (k). In this study, k was determined from the dual tracer technique in Florida Bay. The observed gas transfer velocity was lower than previous studies in the coastal and open oceans at the same wind speeds, most likely due to wave attenuation by seagrass and limited wind fetch in this area.
  PubDate: Thu, 23 Mar 2023 04:00:01 +010
  DOI: 10.5194/bg-20-1075-2023 2023
Observational benchmarks inform representation of soil organic carbon
dynamics in land surface models
- Abstract: Observational benchmarks inform representation of soil organic carbon dynamics in land surface models
  Kamal Nyaupane, Umakant Mishra, Feng Tao, Kyongmin Yeo, William J. Riley, Forrest M. Hoffman, and Sagar Gautam
  Biogeosciences Discuss., https//doi.org/10.5194/bg-2023-50,2023
  Preprint under review for BG (discussion: open, 0 comments)
  Representing soil organic carbon (SOC) dynamics in Earth system models (ESMs) is a key source of uncertainty in predicting carbon climate feedbacks. We used machine learning to develop and compare predictive relationships in observations and ESMs. We found different relationships between environmental factors and SOC stocks in observations and ESMs. SOC predictions in ESMs may be improved by representing the functional relationships of environmental controllers consistent with observations.
  PubDate: Tue, 21 Mar 2023 04:00:01 +010
  DOI: 10.5194/bg-2023-502023
Remote sensing reveals fire-driven facilitation of a C4 rhizomatous alien
grass on a small Mediterranean volcanic island
- Abstract: Remote sensing reveals fire-driven facilitation of a C4 rhizomatous alien grass on a small Mediterranean volcanic island
  Riccardo Guarino, Daniele Cerra, Renzo Zaia, Alessandro Chiarucci, Pietro Lo Cascio, Duccio Rocchini, Piero Zannini, and Salvatore Pasta
  Biogeosciences Discuss., https//doi.org/10.5194/bg-2023-19,2023
  Preprint under review for BG (discussion: open, 0 comments)
  For the first time, we documented the outstanding after-fire resilience of an invasive alien species, Saccharum biflorum, a rhizomatous C4 perennial grass introduced in the 19th century on the small volcanic island of Stromboli (Aeolian archipelago, Italy, Mediterranean Sea). Even if Saccharum biflorum prevails on native species in the early after-fire succession, it counteracts hydrogeological instability, paving the way to the recolonisation by native woody vegetation within a few decades.
  PubDate: Tue, 21 Mar 2023 04:00:01 +010
  DOI: 10.5194/bg-2023-192023
North Atlantic patterns of primary production and phenology in two Earth
System Models
- Abstract: North Atlantic patterns of primary production and phenology in two Earth System Models
  Jenny Hieronymus, Magnus Hieronymus, Matthias Gröger, Jörg Schwinger, Raffaele Bernadello, Etienne Tourigny, Valentina Sicardi, Itzel Ruvalcaba Baroni, and Klaus Wyser
  Biogeosciences Discuss., https//doi.org/10.5194/bg-2023-54,2023
  Preprint under review for BG (discussion: open, 0 comments)
  Changes in the seasonality of primary production has been examined using daily data from two earth system models covering the period 1750–2100. The daily data made it possible to detect shifts in the day of the year during which the net primary production reaches its peak value. It was found that the day of peak primary production occurs earlier and earlier during the 21st century and that a major change in the time series occurs in the beginning of the 21st century.
  PubDate: Mon, 20 Mar 2023 04:00:01 +010
  DOI: 10.5194/bg-2023-542023
Deforestation for agriculture leads to soil warming and enhanced litter
decomposition in subarctic soils
- Abstract: Deforestation for agriculture leads to soil warming and enhanced litter decomposition in subarctic soils
  Tino Peplau, Christopher Poeplau, Edward Gregorich, and Julia Schroeder
  Biogeosciences, 20, 1063–1074, https://doi.org/10.5194/bg-20-1063-2023, 2023
  We buried tea bags and temperature loggers in a paired-plot design in soils under forest and agricultural land and retrieved them after 2 years to quantify the effect of land-use change on soil temperature and litter decomposition in subarctic agricultural systems. We could show that agricultural soils were on average 2 °C warmer than forests and that litter decomposition was enhanced. The results imply that deforestation amplifies effects of climate change on soil organic matter dynamics.
  PubDate: Fri, 17 Mar 2023 04:01:45 +010
  DOI: 10.5194/bg-20-1063-2023 2023
Determination of respiration and photosynthesis fractionation factors for
atmospheric dioxygen inferred from a vegetation–soil–atmosphere
analogue of the terrestrial biosphere in closed chambers
- Abstract: Determination of respiration and photosynthesis fractionation factors for atmospheric dioxygen inferred from a vegetation–soil–atmosphere analogue of the terrestrial biosphere in closed chambers
  Clémence Paul, Clément Piel, Joana Sauze, Nicolas Pasquier, Frédéric Prié, Sébastien Devidal, Roxanne Jacob, Arnaud Dapoigny, Olivier Jossoud, Alexandru Milcu, and Amaëlle Landais
  Biogeosciences, 20, 1047–1062, https://doi.org/10.5194/bg-20-1047-2023, 2023
  To improve the interpretation of the δ18Oatm and Δ17O of O2 in air bubbles in ice cores, we need to better quantify the oxygen fractionation coefficients associated with biological processes. We performed a simplified analogue of the terrestrial biosphere in a closed chamber. We found a respiration fractionation in agreement with the previous estimates at the microorganism scale, and a terrestrial photosynthetic fractionation was found. This has an impact on the estimation of the Dole effect.
  PubDate: Thu, 16 Mar 2023 04:01:45 +010
  DOI: 10.5194/bg-20-1047-2023 2023
Assessing the sensitivity of multi-frequency passive microwave vegetation
optical depth to vegetation properties
- Abstract: Assessing the sensitivity of multi-frequency passive microwave vegetation optical depth to vegetation properties
  Luisa Schmidt, Matthias Forkel, Ruxandra-Maria Zotta, Samuel Scherrer, Wouter A. Dorigo, Alexander Kuhn-Régnier, Robin van der Schalie, and Marta Yebra
  Biogeosciences, 20, 1027–1046, https://doi.org/10.5194/bg-20-1027-2023, 2023
  Vegetation attenuates natural microwave emissions from the land surface. The strength of this attenuation is quantified as the vegetation optical depth (VOD) parameter and is influenced by the vegetation mass, structure, water content, and observation wavelength. Here we model the VOD signal as a multi-variate function of several descriptive vegetation variables. The results help in understanding the effects of ecosystem properties on VOD.
  PubDate: Thu, 16 Mar 2023 04:01:45 +010
  DOI: 10.5194/bg-20-1027-2023 2023
Production and accumulation of reef framework by calcifying corals and
macroalgae on a remote Indian Ocean cay
- Abstract: Production and accumulation of reef framework by calcifying corals and macroalgae on a remote Indian Ocean cay
  M. James McLaughlin, Cindy Bessey, Gary A. Kendrick, John Keesing, and Ylva S. Olsen
  Biogeosciences, 20, 1011–1026, https://doi.org/10.5194/bg-20-1011-2023, 2023
  Coral reefs face increasing pressures from environmental change at present. The coral reef framework is produced by corals and calcifying algae. The Kimberley region of Western Australia has escaped land-based anthropogenic impacts. Specimens of the dominant coral and algae were collected from Browse Island's reef platform and incubated in mesocosms to measure calcification and production patterns of oxygen. This study provides important data on reef building and climate-driven effects.
  PubDate: Wed, 15 Mar 2023 04:01:45 +010
  DOI: 10.5194/bg-20-1011-2023 2023
Characteristics of Physical and Biochemical Parameters within Mesoscale
Eddies in the Southern Ocean
- Abstract: Characteristics of Physical and Biochemical Parameters within Mesoscale Eddies in the Southern Ocean
  Qian Liu, Yingjie Liu, and Xiaofeng Li
  Biogeosciences Discuss., https//doi.org/10.5194/bg-2023-39,2023
  Preprint under review for BG (discussion: open, 0 comments)
  In the Southern Ocean, abundant eddies behave opposite to our expectations. That is, anticyclonic (cyclonic) eddies are cold (warm). By investigating the variations of physical and biochemical parameters in eddies, we find that abnormal eddies have unique and significant effects on modulating the parameters. This study fills a gap in understanding the effects of abnormal eddies on physical and biochemical parameters in the Southern Ocean.
  PubDate: Wed, 15 Mar 2023 04:01:45 +010
  DOI: 10.5194/bg-2023-392023
Model estimates of metazoans' contributions to the biological carbon pump
- Abstract: Model estimates of metazoans' contributions to the biological carbon pump
  Jérôme Pinti, Tim DeVries, Tommy Norin, Camila Serra-Pompei, Roland Proud, David A. Siegel, Thomas Kiørboe, Colleen M. Petrik, Ken H. Andersen, Andrew S. Brierley, and André W. Visser
  Biogeosciences, 20, 997–1009, https://doi.org/10.5194/bg-20-997-2023, 2023
  Large numbers of marine organisms such as zooplankton and fish perform daily vertical migration between the surface (at night) and the depths (in the daytime). This fascinating migration is important for the carbon cycle, as these organisms actively bring carbon to depths where it is stored away from the atmosphere for a long time. Here, we quantify the contributions of different animals to this carbon drawdown and storage and show that fish are important to the biological carbon pump.
  PubDate: Tue, 14 Mar 2023 04:01:45 +010
  DOI: 10.5194/bg-20-997-2023 2023
Assessing CO2 and CH4 fluxes from mounds of African fungus-growing
termites
- Abstract: Assessing CO2 and CH4 fluxes from mounds of African fungus-growing termites
  Matti Räsänen, Risto Vesala, Petri Rönnholm, Laura Arppe, Petra Manninen, Markus Jylhä, Jouko Rikkinen, Petri Pellikka, and Janne Rinne
  Biogeosciences Discuss., https//doi.org/10.5194/bg-2023-24,2023
  Preprint under review for BG (discussion: open, 0 comments)
  Fungus-growing termites recycle large part of dead plant material in African savannas and are significant sources of greenhouse gases. We measured CO2 and CH4 fluxes from their mounds and surrounding soils at open and closed habitats. The fluxes scale with mound volume. The results show that emissions from mounds of fungus-growing termites are more stable than those from other termites. The soil fluxes around the mound are affected by the termite colonies up to 2 m distance from the mound.
  PubDate: Tue, 14 Mar 2023 04:01:45 +010
  DOI: 10.5194/bg-2023-242023
Ideas and perspectives: Beyond model evaluation – combining experiments
and models to advance terrestrial ecosystem science
- Abstract: Ideas and perspectives: Beyond model evaluation – combining experiments and models to advance terrestrial ecosystem science
  Silvia Caldararu, Victor Rolo, Benjamin D. Stocker, Teresa E. Gimeno, and Richard Nair
  Biogeosciences Discuss., https//doi.org/10.5194/bg-2023-47,2023
  Preprint under review for BG (discussion: open, 0 comments)
  Ecosystem manipulative experiments are large experiments in real ecosystems. They include processes such as species interactions and weather which would be omitted in more controlled settings. They offer a high level of realism, but are underused in combination with vegetation models, used to predict the response of ecosystems to global change. We propose a workflow using models and ecosystem experiments together, taking advantage of the benefits of both tools for earth system understanding.
  PubDate: Tue, 14 Mar 2023 04:01:45 +010
  DOI: 10.5194/bg-2023-472023
Atmospheric deposition of reactive nitrogen to a deciduous forest in the
southern Appalachian Mountains
- Abstract: Atmospheric deposition of reactive nitrogen to a deciduous forest in the southern Appalachian Mountains
  John T. Walker, Xi Chen, Zhiyong Wu, Donna Schwede, Ryan Daly, Aleksandra Djurkovic, A. Christopher Oishi, Eric Edgerton, Jesse Bash, Jennifer Knoepp, Melissa Puchalski, John Iiames, and Chelcy F. Miniat
  Biogeosciences, 20, 971–995, https://doi.org/10.5194/bg-20-971-2023, 2023
  Better estimates of atmospheric nitrogen (N) deposition are needed to accurately assess ecosystem risk and impacts from deposition of nutrients and acidity. Using measurements and modeling, we estimate total N deposition of 6.7 kg N ha−1 yr−1 at a forest site in the southern Appalachian Mountains, a region sensitive to atmospheric deposition. Reductions in deposition of reduced forms of N (ammonia and ammonium) will be needed to meet the lowest estimates of N critical loads for the region.
  PubDate: Thu, 09 Mar 2023 02:41:49 +010
  DOI: 10.5194/bg-20-971-2023 2023
Zooplankton community succession and trophic links during a mesocosm
experiment in the coastal upwelling off Callao Bay (Peru)
- Abstract: Zooplankton community succession and trophic links during a mesocosm experiment in the coastal upwelling off Callao Bay (Peru)
  Patricia Ayón Dejo, Elda Luz Pinedo Arteaga, Anna Schukat, Jan Taucher, Rainer Kiko, Helena Hauss, Sabrina Dorschner, Wilhelm Hagen, Mariona Segura-Noguera, and Silke Lischka
  Biogeosciences, 20, 945–969, https://doi.org/10.5194/bg-20-945-2023, 2023
  Ocean upwelling regions are highly productive. With ocean warming, severe changes in upwelling frequency and/or intensity and expansion of accompanying oxygen minimum zones are projected. In a field experiment off Peru, we investigated how different upwelling intensities affect the pelagic food web and found failed reproduction of dominant zooplankton. The changes projected could severely impact the reproductive success of zooplankton communities and the pelagic food web in upwelling regions.
  PubDate: Thu, 09 Mar 2023 02:41:49 +010
  DOI: 10.5194/bg-20-945-2023 2023
Abrasion of sedimentary rocks as a source of hydrogen peroxide and
nutrients to subglacial ecosystems
- Abstract: Abrasion of sedimentary rocks as a source of hydrogen peroxide and nutrients to subglacial ecosystems
  Beatriz Gill-Olivas, Jon Telling, Mark Skidmore, and Martyn Tranter
  Biogeosciences, 20, 929–943, https://doi.org/10.5194/bg-20-929-2023, 2023
  Microbial ecosystems have been found in all subglacial environments sampled to date. Yet, little is known of the sources of energy and nutrients that sustain these microbial populations. This study shows that crushing of sedimentary rocks, which contain organic carbon, carbonate and sulfide minerals, along with previously weathered silicate minerals, produces a range of compounds and nutrients which can be utilised by the diverse suite of microbes that inhabit glacier beds.
  PubDate: Tue, 07 Mar 2023 02:41:49 +010
  DOI: 10.5194/bg-20-929-2023 2023
Reviews and syntheses: Expanding the global coverage of gross primary
production and net community production measurements using BGC-Argo floats
- Abstract: Reviews and syntheses: Expanding the global coverage of gross primary production and net community production measurements using BGC-Argo floats
  Robert W. Izett, Katja Fennel, Adam C. Stoer, and David P. Nicholson
  Biogeosciences Discuss., https//doi.org/10.5194/bg-2023-46,2023
  Preprint under review for BG (discussion: open, 0 comments)
  This manuscript provides an overview of the capacity to expand the global coverage of marine primary production estimates using autonomous ocean-going instruments, called Biogeochemical-Argo floats. We review existing approaches to quantifying primary production using floats, provide examples of the current implementation of the methods, and offer insights into how they can be better exploited. This paper is timely, given the ongoing expansion of the biogeochemical Argo array.
  PubDate: Tue, 07 Mar 2023 02:41:49 +010
  DOI: 10.5194/bg-2023-462023
Long-term additions of ammonium nitrate to montane forest ecosystems may
cause limited soil acidification, even in presence of soil carbonate
- Abstract: Long-term additions of ammonium nitrate to montane forest ecosystems may cause limited soil acidification, even in presence of soil carbonate
  Thomas Baer, Gerhard Furrer, Stephan Zimmermann, and Patrick Schleppi
  Biogeosciences Discuss., https//doi.org/10.5194/bg-2023-38,2023
  Preprint under review for BG (discussion: open, 0 comments)
  Nitrogen (N) deposition to forest ecosystems is a matter of concern because it affects their nutrient status and make their soil acidic. We observed an ongoing acidification in a montane forest in central Switzerland even if the sub-soil of this site contains carbonates and is thus well-buffered. We experimentally added N to simulate a higher pollution and this increased the acidification. After 25 years of study, however, we can see first signs of recovery, also in under higher N deposition.
  PubDate: Tue, 07 Mar 2023 02:41:49 +010
  DOI: 10.5194/bg-2023-382023
Reviews and syntheses: Foraminifera from anaerobic environments –
Survival strategies, biogeochemistry, ecology and applications for
paleoceanography
- Abstract: Reviews and syntheses: Foraminifera from anaerobic environments – Survival strategies, biogeochemistry, ecology and applications for paleoceanography
  Nicolaas Glock
  Biogeosciences Discuss., https//doi.org/10.5194/bg-2023-49,2023
  Preprint under review for BG (discussion: open, 0 comments)
  Ocean deoxygenation due to climate warming is an evolving threat for organisms that are not well adapted to O2 depleted conditions, such as many pelagic fish species. Other better adapted organisms, such as benthic foraminifera, might benefit from ocean deoxygenation. Benthic foraminifera are a group of marine protists and can have specific adaptations to O2 depletion such as the ability to respire nitrate instead of O2. This paper reviews the current state of knowledge about these organisms.
  PubDate: Tue, 07 Mar 2023 02:41:49 +010
  DOI: 10.5194/bg-2023-492023
Capabilities of optical and radar Earth observation data for up-scaling
methane emissions linked to subsidence and permafrost degradation in
sub-Arctic peatlands
- Abstract: Capabilities of optical and radar Earth observation data for up-scaling methane emissions linked to subsidence and permafrost degradation in sub-Arctic peatlands
  Sofie Sjogersten, Martha Ledger, Matthias Siewert, Betsabé de la Barreda-Bautista, Andrew Sowter, David Gee, Giles Foody, and Doreen S. Boyd
  Biogeosciences Discuss., https//doi.org/10.5194/bg-2023-17,2023
  Preprint under review for BG (discussion: open, 1 comment)
  Permafrost thaw in Arctic regions is increasing methane emissions but quantification is difficult given the large and remote areas impacted. We show that drone data together with satellite data can be used to extrapolate emissions across the wider landscape as well as detecting areas at risk of higher emissions. A transition of currently degrading areas to fen type vegetation can increase emission with several orders of magnitude highlighting the importance of quantifying areas at risk.
  PubDate: Mon, 06 Mar 2023 02:41:49 +010
  DOI: 10.5194/bg-2023-172023