https://bg.copernicus.org/articles/ Combined list of the recent articles of the journal Biogeosciences and the recent discussion forum Biogeosciences Discussions en https://doi.org/10.5194/bg-23-7009-2026 https://doi.org/10.5194/bg-23-7009-2026 <b>Physicochemical and urban land-use characteristics associated with resistance to precipitation in estuaries vary across scales</b><br> Anna B. Tureţcaia, Nicole G. Dix, Hannah Nicklay, Matthew C. Ferner, and Emily B. Graham<br> Biogeosciences, 23, 7009–7027, https://doi.org/10.5194/bg-23-7009-2026, 2026<br> We investigated what physicochemical and land-use factors relate to estuarine resistance to precipitation across spatial scales and salinity gradient. Urbanized estuaries generally showed higher apparent resistance. Water temperature, depth, turbidity, nitrogen, and chlorophyll-a were associated with resistance at the continental scale, but relationships varied across salinity groups and individual estuaries, highlighting context-dependent responses to precipitation. Wed, 07 Oct 2026 11:18:16 +0200 https://doi.org/10.5194/bg-23-6979-2026 https://doi.org/10.5194/bg-23-6979-2026 <b>Biomarkers and diatoms as tracers of phytoplankton communities and past sea ice conditions in the southwestern Ross Sea, Antarctica: drivers and variability over the last 200 years</b><br> Emma M. de Jong, Xavier Crosta, Sebastian Naeher, Bella Duncan, Johan Etourneau, Jae Il Lee, Robert McKay, and V. Holly L. Winton<br> Biogeosciences, 23, 6979–7008, https://doi.org/10.5194/bg-23-6979-2026, 2026<br> This study examines chemical and biological traces (biomarkers) of microscopic algae in Antarctic sediments. We show how sea ice conditions and different phytoplankton communities influence the types of biomarkers preserved on the seafloor, and how these records reveal an overall increase in sea ice duration in the Ross Sea over the past 200 years.   Wed, 07 Oct 2026 11:18:16 +0200 https://doi.org/10.5194/bg-23-7029-2026 https://doi.org/10.5194/bg-23-7029-2026 <b>Ideas and perspectives: Beyond microbes – integrating termites into global soil carbon cycling models</b><br> Umar Farooq, Chiara Pasut, Ying-Ping Wang, Amy E. Zanne, Habacuc Flores-Moreno, Baptiste Joseph Wijas, David I. Forrester, Jacqueline R. England, Bennett Macdonald, Zachary A. Brown, and Senani Karunaratne<br> Biogeosciences, 23, 7029–7041, https://doi.org/10.5194/bg-23-7029-2026, 2026<br> Global soil carbon models largely focus on microbes and overlook the role of termites in decomposing dead plant material. Here, we present a new framework for representing termite activity in carbon models and estimating how termites redistribute carbon between the atmosphere and soils. Our results suggest that termites strongly influence greenhouse gas emissions and soil carbon cycling, particularly in tropical and seasonally dry regions that are vulnerable to climate change. Wed, 07 Oct 2026 11:18:16 +0200 https://doi.org/10.5194/bg-23-6879-2026 https://doi.org/10.5194/bg-23-6879-2026 <b>Solving calibration and reanalysis challenges of ocean biogeochemical dynamics with neural schemes: a 1D vertical model case-study</b><br> Jean Littaye, Laurent Memery, and Ronan Fablet<br> Biogeosciences, 23, 6879–6914, https://doi.org/10.5194/bg-23-6879-2026, 2026<br> A realistic representation of ocean carbon exchanges through a biogeochemical (BGC) model depends heavily on its parameterisation. However, this calibration is often hindered by an inaccurate representation of small-scale ocean physical dynamics, which are common in physical reanalysis. Here, a novel learning-based method enables a robust estimation of BGC states and parameters, and correction of physical forcing, despite physical forcing uncertainties and sparse observations. Tue, 06 Oct 2026 11:18:16 +0200 https://doi.org/10.5194/bg-23-6947-2026 https://doi.org/10.5194/bg-23-6947-2026 <b>Towards constraining the drivers of variability and trends in subantarctic productivity</b><br> Christopher D. Traill, Tyler W. Rohr, Elizabeth H. Shadwick, Pearse J. Buchanan, Alessandro Tagliabue, and Andrew R. Bowie<br> Biogeosciences, 23, 6947–6977, https://doi.org/10.5194/bg-23-6947-2026, 2026<br> Southern Ocean phytoplankton are a key part of the carbon cycle, yet year-to-year changes in ocean productivity are poorly understood. Using model simulations, this study shows how deeper mixing in the most productive years increases nutrient supply and changes the predator-prey relationship between phytoplankton and zooplankton. This helps explain why satellite productivity estimates disagree, and the reasons for why climate projections might be getting inaccurate estimates of future production. Tue, 06 Oct 2026 11:18:16 +0200 https://doi.org/10.5194/bg-23-6931-2026 https://doi.org/10.5194/bg-23-6931-2026 <b>Unlocking the air: DNA metabarcoding sheds light on seasonal fungal dynamics in a temperate floodplain forest</b><br> Ettore Fedele, Christina M. Müller, Volker Wissemann, Birgit Gemeinholzer, Christian Wirth, and Beatriz Sánchez-Parra<br> Biogeosciences, 23, 6931–6945, https://doi.org/10.5194/bg-23-6931-2026, 2026<br> Fungi are key component of the air we breathe. They travel short and long distances, influencing ecosystems, agriculture and human health worldwide. Using advanced DNA techniques, we monitored airborne fungi in a European floodplain forest and linked their presence to climatic conditions. We found that temperature can shape airborne fungal communities, including the presence of allergenic and pathogenic fungi. This highlights the importance of long-term monitoring under climate change scenarios. Tue, 06 Oct 2026 11:18:16 +0200 https://doi.org/10.5194/bg-23-6915-2026 https://doi.org/10.5194/bg-23-6915-2026 <b>Summer oxygen dynamics in the bottom waters of a wide, temperate shelf sea</b><br> Xin Meng, Claire Mahaffey, Juliane Wihsgott, and Jonathan Sharples<br> Biogeosciences, 23, 6915–6929, https://doi.org/10.5194/bg-23-6915-2026, 2026<br> Summer oxygen loss in Celtic Sea bottom waters was investigated using ship observations and an oxygen budget. Seasonal layering cuts deep water off from the air, while microbes breaking down organic matter consume most oxygen. Winds can mix oxygen downward, but warming may worsen oxygen loss by speeding microbial activity and lowering oxygen solubility. This could push parts of the shelf sea toward oxygen deficiency, with risks for seafloor life and ecosystem health. Tue, 06 Oct 2026 11:18:16 +0200 https://doi.org/10.5194/bg-23-6817-2026 https://doi.org/10.5194/bg-23-6817-2026 <b>Modeling microbial regulatory feedback in organic matter decomposition identifies copiotrophic traits as key drivers of positive priming</b><br> Firnaaz Ahamed, James C. Stegen, Emily B. Graham, Timothy D. Scheibe, and Hyun-Seob Song<br> Biogeosciences, 23, 6817–6833, https://doi.org/10.5194/bg-23-6817-2026, 2026<br> This research examines how labile organic matter influences the breakdown of complex organic matter  (termed priming). Using a new modeling method, the study shows how microbial growth traits and interactions determine whether priming effects are positive or negative. By identifying microbial strategies as critical drivers of decomposition, this work provides a unified framework to improve predictions of nutrient cycling and carbon sequestration across diverse ecosystems. Mon, 05 Oct 2026 11:18:16 +0200 https://doi.org/10.5194/bg-23-6857-2026 https://doi.org/10.5194/bg-23-6857-2026 <b>Variations in Arctic aerosol iron solubility in relation to leaching methodology, air mass characteristics, and seasonality</b><br> Chris M. Marsay, Alina M. Ebling, Peter L. Morton, William M. Landing, and Clifton S. Buck<br> Biogeosciences, 23, 6857–6877, https://doi.org/10.5194/bg-23-6857-2026, 2026<br> Solubility of the micronutrient, iron, was measured in Arctic aerosols collected during the GEOTRACES GN01 section (summer 2015). Solubility is compared across three different methods and used to estimate the atmospheric input of bioavailable iron to the Arctic Ocean. Variations in solubility are described in terms of air mass characteristics. Combining this dataset with winter/spring aerosol iron data from another project, we assess the seasonality of aerosol iron solubility in the Arctic. Mon, 05 Oct 2026 11:18:16 +0200 https://doi.org/10.5194/bg-23-6835-2026 https://doi.org/10.5194/bg-23-6835-2026 <b>Reviews and syntheses: Snow algae on the move – biased motility and snowpack interaction from a biophysics perspective</b><br> Caitlin S. de Vries, Melody J. Sandells, Matthew P. Davey, Gary S. Caldwell, and Ottavio A. Croze<br> Biogeosciences, 23, 6835–6855, https://doi.org/10.5194/bg-23-6835-2026, 2026<br> Snow algae are photosynthetic microorganisms that form colourful blooms on snow surfaces in polar and alpine regions worldwide. The mechanisms governing snow algae motility and migration within snow are currently poorly understood. From a biophysical perspective, we review the current literature available that describes snow algae migration on both macroscopic and microscopic scales, as well as their migratory behaviour in response to light, nutrients, gravity, fluid flow and heat. Mon, 05 Oct 2026 11:18:16 +0200 https://doi.org/10.5194/bg-23-6803-2026 https://doi.org/10.5194/bg-23-6803-2026 <b>Quantifying aggregation bias in marsh carbon flux estimates caused by rhizosphere oxygen heterogeneity</b><br> Youssef Saadaoui, Christian Beer, Peter Mueller, Friederike Neiske, Joscha N. Becker, Annette Eschenbach, and Philipp Porada<br> Biogeosciences, 23, 6803–6816, https://doi.org/10.5194/bg-23-6803-2026, 2026<br> In marsh soils, oxygen concentrations are high close to plant roots and decline to near zero within millimetres. Microorganisms do not decompose organic matter in proportion to oxygen. Many models nevertheless use a single average oxygen concentration. Using Elbe River soils, we compared this approach with a calculation over the full range. The single average overestimated carbon dioxide release by about 12 %. Marsh soils may therefore store more carbon than models predict. Fri, 02 Oct 2026 11:18:16 +0200 https://doi.org/10.5194/bg-23-6781-2026 https://doi.org/10.5194/bg-23-6781-2026 <b>Roles of planktonic metabolism in CO2 fluxes along the river-estuary continuum in a rapidly uplifting catchment of eastern Taiwan</b><br> Jhen-Nien Chen, Pei-En Chen, Yu-Shiang Yen, Tzu-Hsuan Tu, Lu-Yu Wang, Wan-Yin Lien, Yueh-Ting Lin, and Pei-Ling Wang<br> Biogeosciences, 23, 6781–6802, https://doi.org/10.5194/bg-23-6781-2026, 2026<br> This study quantifies planktonic autotrophy and heterotrophy in the Beinan River, a tectonically active mountainous catchment in SE Taiwan. Metabolic rates were higher in the wet season, reflecting strong net heterotrophy. Scaled to the catchment, planktonic CO2 production (~7.9 x 107 mol yr-1) accounts for ~3.8% of total catchment CO2 flux. Microbial communities shifted seasonally, showing planktonic metabolism is a vital part of the riverine carbon cycle. Fri, 02 Oct 2026 11:18:16 +0200 https://doi.org/10.5194/bg-23-6763-2026 https://doi.org/10.5194/bg-23-6763-2026 <b>Tree-microbe-soil interactions affecting soil organic carbon fractions in Mediterranean forest soils</b><br> Stav Livne-Luzon, Assaf Yaakobi, David Yalin, Dagan Sade, Efrat Dener, Yaara Oppenheimer-Shaanan, and Tamir Klein<br> Biogeosciences, 23, 6763–6779, https://doi.org/10.5194/bg-23-6763-2026, 2026<br> We studied how tree species and local soil conditions shape carbon storage in Mediterranean forest soils. By comparing mixed and single-species stands and sampling beneath trees and in nearby open gaps, we found that soils under canopies held much more carbon. Mixed stands stored extra carbon mainly in faster-cycling forms, while longer-lasting carbon was limited mostly by soil texture. This shows that forest structure can influence carbon storage in a warming, drier climate. Tue, 29 Sep 2026 11:18:16 +0200 https://doi.org/10.5194/bg-23-6741-2026 https://doi.org/10.5194/bg-23-6741-2026 <b>Balancing nitrogen use efficiency, losses and soil nitrogen depletion to evaluate national scale agri-environmental performance over 40 years</b><br> Jize Jiang, Lenny H. E. Winkel, Chloé Wüst-Galley, Daniel Bretscher, Magdalena Necpalova, Andrea Stenke, and Johan Six<br> Biogeosciences, 23, 6741–6761, https://doi.org/10.5194/bg-23-6741-2026, 2026<br> We studied nitrogen use in Swiss agriculture for four decades using detailed data and modelling. We found that nitrogen use efficiency improved, while nitrogen losses decreased. Yet, modelling results suggested that cropland soils may lose nitrogen. The results show that policies implementation benefited productivity and reduced pollution. On the other hand, soil nitrogen balance should also be monitored, underscoring the need for integrated nitrogen management. Thu, 24 Sep 2026 11:18:16 +0200 https://doi.org/10.5194/bg-23-6705-2026 https://doi.org/10.5194/bg-23-6705-2026 <b>High nitrous oxide isotopic variability during denitrification by Pseudomonas species bearing NirK and NirS</b><br> Noémy Chénier, Paul M. Magyar, Jakob Zopfi, Claudia Frey, Thomas Kuhn, Moritz F. Lehmann, and Joachim Mohn<br> Biogeosciences, 23, 6705–6724, https://doi.org/10.5194/bg-23-6705-2026, 2026<br> N₂O is a greenhouse gas produced by microbes during nitrogen cycling. We studied two bacterial species and found that the isotope signatures of the N₂O they produced changed strongly depending on growth conditions and cell activity. Early during growth, the distribution of N isotopes within the N₂O molecule also changed unexpectedly. These results show that N₂O isotope signatures are more variable than previously assumed and depend strongly on physiology. Thu, 24 Sep 2026 11:18:16 +0200 https://doi.org/10.5194/bg-23-6725-2026 https://doi.org/10.5194/bg-23-6725-2026 <b>Exploratory characterization of bacterial communities and predicted functional profiles in six water samples from four Colombian Andean lakes using 16S rRNA gene amplicon sequencing</b><br> Andrés Gómez-Palacio, Johana Marín-Suarez, Adriana Pedroza-Ramos, and Nelson Aranguren-Riaño<br> Biogeosciences, 23, 6725–6739, https://doi.org/10.5194/bg-23-6725-2026, 2026<br> We surveyed bacterial communities in six water samples from four Colombian Andean highland lakes using 16S rRNA gene sequencing. Samples differed in taxonomic composition, diversity, and predicted functional profiles, and low-abundance genera of potential health relevance were detected. Given the limited sampling and lack of concurrent environmental measurements, these findings provide an exploratory baseline rather than evidence of specific environmental or anthropogenic effects. Thu, 24 Sep 2026 11:18:16 +0200 https://doi.org/10.5194/bg-23-6671-2026 https://doi.org/10.5194/bg-23-6671-2026 <b>Profile-wide desalinization is associated with increased deep-soil microbial biomass and reduced iron-bound carbon in coastal wetland restoration</b><br> Jingwen Gao, Pengcheng Jiang, Xiaofei Ye, Xingna Lin, Xuexin Shao, Ming Wu, and Niu Li<br> Biogeosciences, 23, 6671–6685, https://doi.org/10.5194/bg-23-6671-2026, 2026<br> Coastal wetland restoration often removes invasive plants, but its effects on deep soil carbon are uncertain. We compared plastic mulching and deep tillage for eighteen months in an invaded wetland. Mulching reduced soil salt, increased microbial biomass in deep soil, and coincided with lower carbon and iron-bound carbon through one metre of soil. These results show that restoration methods can affect hidden deep soil carbon, so monitoring should include the whole soil profile. Wed, 23 Sep 2026 11:18:16 +0200 https://doi.org/10.5194/bg-23-6687-2026 https://doi.org/10.5194/bg-23-6687-2026 <b>Using deep learning to assimilate sun-induced fluorescence satellite observations in the ISBA land surface model</b><br> Pierre Vanderbecken, Jasmin Vural, Oscar Rojas-Muñoz, Sébastien Garrigues, Bertrand Bonan, Cédric Bacour, Uwe Rascher, Bastian Siegmann, Patricia de Rosnay, and Jean-Christophe Calvet<br> Biogeosciences, 23, 6687–6703, https://doi.org/10.5194/bg-23-6687-2026, 2026<br> New satellite observations are used to improve our understanding of regional-scale vegetation. Innovative artificial intelligence methods are employed to combine the available information. The effectiveness of this approach is evaluated using independent observations. The results show that agricultural practices such as irrigation can be modelled more accurately. Wed, 23 Sep 2026 11:18:16 +0200 https://doi.org/10.5194/bg-23-6583-2026 https://doi.org/10.5194/bg-23-6583-2026 <b>Natural wetland methane emissions simulated by ICON-XPP</b><br> Stiig Wilkenskjeld, Thomas Kleinen, Tobias Stacke, and Victor Brovkin<br> Biogeosciences, 23, 6583–6598, https://doi.org/10.5194/bg-23-6583-2026, 2026<br> Methane is the second most important greenhouse gas with high potential for short term reductions of human induced global warming. We model methane emissions from the most important and most uncertain natural source: wetlands. We investigate how a number of assumptions, including human impact on natural wetlands, influences the wetlands and their methane emissions. Of the tested influences we find the most important to be how humans are altering the soil surface. Mon, 21 Sep 2026 11:18:16 +0200 https://doi.org/10.5194/bg-23-6599-2026 https://doi.org/10.5194/bg-23-6599-2026 <b>Landscape- and site-scale spatial variability of blue carbon stocks and fluxes in tropical seagrass meadows</b><br> Naima Iram, Kiah Eng Lim, Muhammad Ariq Khalingga, Pierre Taillardat, Sheryl Chan Si Ern, Lian Pin Koh, and Daniel A. Friess<br> Biogeosciences, 23, 6599–6611, https://doi.org/10.5194/bg-23-6599-2026, 2026<br> We studied how blue carbon stocks and CO2 and CH4 fluxes vary at the landscape scale in tropical seagrass meadows. By testing six seagrass meadows across Singapore, we found that carbon stocks 0-25 cm and flux variability is not shaped by geomorphic settings, at least at the intermediate landscape scale. Our results support the inclusion of greenhouse gas fluxes in carbon accounting schemes. Mon, 21 Sep 2026 11:18:16 +0200