JournalTOCs

Biogeosciences Discussions (BGD)
Journal Prestige (SJR): 0.228

Number of Followers: 4

This is an Open Access Journal

Open Access journal
ISSN (Print) 1810-6277 - ISSN (Online) 1810-6285
Published by Copernicus Publications

[54 journals]

Impacts and uncertainties of climate-induced changes in watershed inputs
on estuarine hypoxia
- Abstract: Impacts and uncertainties of climate-induced changes in watershed inputs on estuarine hypoxia
  Kyle E. Hinson, Marjorie A. M. Friedrichs, Raymond G. Najjar, Maria Herrmann, Zihao Bian, Gopal Bhatt, Pierre St-Laurent, Hanqin Tian, and Gary Shenk
  Biogeosciences, 20, 1937–1961, https://doi.org/10.5194/bg-20-1937-2023, 2023
  Climate impacts are essential for environmental managers to consider when implementing nutrient reduction plans designed to reduce hypoxia. This work highlights relative sources of uncertainty in modeling regional climate impacts on the Chesapeake Bay watershed and consequent declines in bay oxygen levels. The results demonstrate that planned water quality improvement goals are capable of reducing hypoxia levels by half, offsetting climate-driven impacts on terrestrial runoff.
  PubDate: Fri, 26 May 2023 22:23:36 +020
  DOI: 10.5194/bg-20-1937-2023 2023
Considerations for hypothetical carbon dioxide removal via alkalinity
addition in the Amazon River watershed
- Abstract: Considerations for hypothetical carbon dioxide removal via alkalinity addition in the Amazon River watershed
  Linquan Mu, Jaime B. Palter, and Hongjie Wang
  Biogeosciences, 20, 1963–1977, https://doi.org/10.5194/bg-20-1963-2023, 2023
  Enhancing ocean alkalinity accelerates carbon dioxide removal from the atmosphere. We hypothetically added alkalinity to the Amazon River and examined the increment of the carbon uptake by the Amazon plume. We also investigated the minimum alkalinity addition in which this perturbation at the river mouth could be detected above the natural variability.
  PubDate: Fri, 26 May 2023 22:23:36 +020
  DOI: 10.5194/bg-20-1963-2023 2023
Warming accelerates belowground litter turnover in salt marshes –
insights from a Tea Bag Index study
- Abstract: Warming accelerates belowground litter turnover in salt marshes – insights from a Tea Bag Index study
  Hao Tang, Stefanie Nolte, Kai Jensen, Roy Rich, Julian Mittmann-Goetsch, and Peter Mueller
  Biogeosciences, 20, 1925–1935, https://doi.org/10.5194/bg-20-1925-2023, 2023
  In order to gain the first mechanistic insight into warming effects and litter breakdown dynamics across whole-soil profiles, we used a unique field warming experiment and standardized plant litter to investigate the degree to which rising soil temperatures can accelerate belowground litter breakdown in coastal wetland ecosystems. We found warming strongly increases the initial rate of labile litter decomposition but has less consistent effects on the stabilization of this material.
  PubDate: Wed, 24 May 2023 22:23:36 +020
  DOI: 10.5194/bg-20-1925-2023 2023
The Volyn biota (Ukraine) – indications of 1.5 Gyr old eukaryotes in
3D preservation, a spotlight on the “boring billion”
- Abstract: The Volyn biota (Ukraine) – indications of 1.5 Gyr old eukaryotes in 3D preservation, a spotlight on the “boring billion”
  Gerhard Franz, Vladimir Khomenko, Peter Lyckberg, Vsevolod Chournousenko, Ulrich Struck, Ulrich Gernert, and Jörg Nissen
  Biogeosciences, 20, 1901–1924, https://doi.org/10.5194/bg-20-1901-2023, 2023
  This research describes the occurrence of Precambrian fossils, with exceptionally well preserved morphology in 3D. These microfossils reach a size of millimeters (possibly up to centimeters) and thus indicate the presence of multicellular eukaryotes. Many of them are filamentous, but other types were also found. These fossils lived in a depth of several hundred meters and thus provide good evidence of a continental the deep biosphere, from a time generally considered as the boring billion.
  PubDate: Wed, 24 May 2023 22:23:36 +020
  DOI: 10.5194/bg-20-1901-2023 2023
Effect of droughts and climate change on future soil weathering rates in
Sweden
- Abstract: Effect of droughts and climate change on future soil weathering rates in Sweden
  Veronika Kronnäs, Klas Lucander, Giuliana Zanchi, Nadja Stadlinger, Salim Belyazid, and Cecilia Akselsson
  Biogeosciences, 20, 1879–1899, https://doi.org/10.5194/bg-20-1879-2023, 2023
  In a future climate, extreme droughts might become more common. Climate change and droughts can have negative effects on soil weathering and plant health.In this study, climate change effects on weathering were studied on sites in Sweden using the model ForSAFE, a climate change scenario and an extreme drought scenario. The modelling shows that weathering is higher during summer and increases with global warming but that weathering during drought summers can become as low as winter weathering.
  PubDate: Tue, 23 May 2023 22:23:36 +020
  DOI: 10.5194/bg-20-1879-2023 2023
A comparison of the climate and carbon cycle effects of carbon removal by
afforestation and an equivalent reduction in fossil fuel emissions
- Abstract: A comparison of the climate and carbon cycle effects of carbon removal by afforestation and an equivalent reduction in fossil fuel emissions
  Koramanghat Unnikrishnan Jayakrishnan and Govindasamy Bala
  Biogeosciences, 20, 1863–1877, https://doi.org/10.5194/bg-20-1863-2023, 2023
  Afforestation and reducing fossil fuel emissions are two important mitigation strategies to reduce the amount of global warming. Our work shows that reducing fossil fuel emissions is relatively more effective than afforestation for the same amount of carbon removed from the atmosphere. However, understanding of the processes that govern the biophysical effects of afforestation should be improved before considering our results for climate policy.
  PubDate: Tue, 23 May 2023 22:23:36 +020
  DOI: 10.5194/bg-20-1863-2023 2023
Late Quaternary palaeoenvironmental evolution and sea level oscillation of
Santa Catarina Island (southern Brazil)
- Abstract: Late Quaternary palaeoenvironmental evolution and sea level oscillation of Santa Catarina Island (southern Brazil)
  Lidia A. Kuhn, Karin A. F. Zonneveld, Paulo A. Souza, and Rodrigo R. Cancelli
  Biogeosciences, 20, 1843–1861, https://doi.org/10.5194/bg-20-1843-2023, 2023
  This study investigated changes in coastal ecosystems that reflect environmental changes over the past 6500 years on Brazil's largest oceanic island. This study was motivated by the need to understand the natural evolution of coastal areas to predict future changes. The results highlight the sensitivity of this ecosystem to changes caused by relative sea level variations. As such, it contributes to the debate about potential effects of current climate change induced by global sea level changes.
  PubDate: Tue, 23 May 2023 22:23:36 +020
  DOI: 10.5194/bg-20-1843-2023 2023
Differentiation of cognate bacterial communities in thermokarst
landscapes: implications for ecological consequences of permafrost
degradation
- Abstract: Differentiation of cognate bacterial communities in thermokarst landscapes: implications for ecological consequences of permafrost degradation
  Ze Ren, Shudan Ye, Hongxuan Li, Xilei Huang, and Luyao Chen
  Biogeosciences Discuss., https//doi.org/10.5194/bg-2023-85,2023
  Preprint under review for BG (discussion: open, 0 comments)
  Permafrost thaw initiates thermokarst landscape formation, resulting in distinct new habitats, including degraded permafrost soil, thermokarst lake sediments, and lake water. These distinct habitats harbored differentiated bacterial communities that originated from the same source, differing in diversity, assembly mechanisms, and environmental influences. The results implied ecological consequences of permafrost degradation in the face of further climate change.
  PubDate: Tue, 23 May 2023 22:23:36 +020
  DOI: 10.5194/bg-2023-852023
Approaching the diversity and density dilemma of the
lebensspuren-tracemaker tandem: a study case from abyssal Northwest
Pacific
- Abstract: Approaching the diversity and density dilemma of the lebensspuren-tracemaker tandem: a study case from abyssal Northwest Pacific
  Olmo Miguez-Salas, Angelika Brandt, Henry Knauber, and Torben Riehl
  Biogeosciences Discuss., https//doi.org/10.5194/bg-2023-81,2023
  Preprint under review for BG (discussion: open, 0 comments)
  In the deep-sea, the interaction between benthic fauna (tracemaker) and substrate can be preserved as traces (i.e., lebensspuren) which are common features of deep seafloor landscapes, rendering them promising proxies to infer biodiversity. No general correlation could be observed between traces and benthic fauna. However, local correlation was observed between specific stations. Density was either positively or negatively correlated with tracemaker densities, depending on the traces.
  PubDate: Tue, 23 May 2023 22:23:36 +020
  DOI: 10.5194/bg-2023-812023
Origin of secondary fatty alcohols in atmospheric aerosols in a
cool-temperate forest based on their mass size distributions
- Abstract: Origin of secondary fatty alcohols in atmospheric aerosols in a cool-temperate forest based on their mass size distributions
  Yuhao Cui, Eri Tachibana, Kimitaka Kawamura, and Yuzo Miyazaki
  Biogeosciences Discuss., https//doi.org/10.5194/bg-2023-73,2023
  Preprint under review for BG (discussion: open, 0 comments)
  Fatty alcohols (FAs) are major components of surface lipids in plant leaves and serve as surface-active aerosols. Our study on the aerosol size distributions in a forest suggested that secondary FAs (SFAs) originated from plant waxes, and that leaf senescence status is likely an important factor controlling the size distribution of SFAs. This study provides new insights into the sources of primary biological aerosol particles (PBAPs) and their effects on the aerosol ice nucleation activity.
  PubDate: Tue, 23 May 2023 22:23:36 +020
  DOI: 10.5194/bg-2023-732023
A reanalysis of the foundations of the macromolecular rate theory
- Abstract: A reanalysis of the foundations of the macromolecular rate theory
  Jinyun Tang and William J. Riley
  Biogeosciences Discuss., https//doi.org/10.5194/bg-2023-77,2023
  Preprint under review for BG (discussion: open, 0 comments)
  A chemical kinetics theory is proposed to explain the non-monotonic relationship between temperature and biochemical rates. It revealed some problems in the popular macromolecular rate theory, and is more consistent with our current understanding of proteins that they may denature reversibly as a function of temperature. Our results imply that plants, microbes and animals may be able to perform optimally under different temperatures by adjusting their internal substrate for enzymatic processes.
  PubDate: Tue, 23 May 2023 22:23:36 +020
  DOI: 10.5194/bg-2023-772023
Carbon cycle extremes accelerate weakening of the land carbon sink in the
late 21st century
- Abstract: Carbon cycle extremes accelerate weakening of the land carbon sink in the late 21st century
  Bharat Sharma, Jitendra Kumar, Auroop R. Ganguly, and Forrest M. Hoffman
  Biogeosciences, 20, 1829–1841, https://doi.org/10.5194/bg-20-1829-2023, 2023
  Rising atmospheric carbon dioxide increases vegetation growth and causes more heatwaves and droughts. The impact of such climate extremes is detrimental to terrestrial carbon uptake capacity. We found that due to overall climate warming, about 88 % of the world's regions towards the end of 2100 will show anomalous losses in net biospheric productivity (NBP) rather than gains. More than 50 % of all negative NBP extremes were driven by the compound effect of dry, hot, and fire conditions.
  PubDate: Mon, 22 May 2023 22:23:36 +020
  DOI: 10.5194/bg-20-1829-2023 2023
Technical note: Enhancement of float-pH data quality control methods: A
study case in the Subpolar Northwestern Atlantic region
- Abstract: Technical note: Enhancement of float-pH data quality control methods: A study case in the Subpolar Northwestern Atlantic region
  Cathy Wimart-Rousseau, Tobias Steinhoff, Birgit Klein, Henry Bittig, and Arne Körtzinger
  Biogeosciences Discuss., https//doi.org/10.5194/bg-2023-76,2023
  Preprint under review for BG (discussion: open, 0 comments)
  The marine CO2 system can be measured independently and continuously by BGC-Argo floats since numerous pH sensors have been developed to suit on these autonomous measurements platforms. By applying the Argo correction routines to float-pH data acquired in the subpolar North Atlantic Ocean, we report the uncertainty and lack of objective criteria associated with the choice of the reference method as well the reference depth for the pH correction.
  PubDate: Mon, 22 May 2023 22:23:36 +020
  DOI: 10.5194/bg-2023-762023
Central Arctic Ocean surface-atmosphere exchange of CO2 and CH4
constrained by direct measurements
- Abstract: Central Arctic Ocean surface-atmosphere exchange of CO2 and CH4 constrained by direct measurements
  John Prytherch, Sonja Murto, Ian Brown, Adam Ulfsbo, Brett F. Thornton, Volker Brüchert, Michael Tjernström, Anna Lunde Hermansson, Amanda T. Nylund, and Lina A. Holthusen
  Biogeosciences Discuss., https//doi.org/10.5194/bg-2023-82,2023
  Preprint under review for BG (discussion: open, 0 comments)
  We used chamber-flux systems to directly measure methane and carbon dioxide exchange between the ocean or sea ice and the atmosphere during an icebreaker-based expedition to the Central Arctic Ocean in summer 2021. These measurement-based constraints inform climate modeling and carbon budgets. The methane exchange measurements, the first such made in the CAO, are lower than previous estimates and imply that the CAO is an insignificant contributor to Arctic methane emission.
  PubDate: Mon, 22 May 2023 22:23:36 +020
  DOI: 10.5194/bg-2023-822023
Deciphering the origin of dubiofossils from the Pennsylvanian of the
Paraná Basin, Brazil
- Abstract: Deciphering the origin of dubiofossils from the Pennsylvanian of the Paraná Basin, Brazil
  João Pedro Saldanha Saldanha, Joice Cagliari, Rodrigo Sacalise Horodyski, Lucas Del Mouro, and Mírian Liza Alves Forancelli Pacheco
  Biogeosciences Discuss., https//doi.org/10.5194/bg-2023-56,2023
  Preprint under review for BG (discussion: open, 0 comments)
  the geological record is complex regardless of whether it is the result of biotic or abiotic processes. Overlapping and repeating chemical reactions occur over time, producing objects with exotic shapes or compositions distinct from the norm. Assessing the geological history is crucial particularly given the ubiquitous presence of life throughout the planet's surface and crust. We provide a detailed description to unravel the material's intricate history and evaluate the role of microorganisms.
  PubDate: Wed, 17 May 2023 21:52:34 +020
  DOI: 10.5194/bg-2023-562023
Ocean acidification enhances primary productivity and nocturnal carbonate
dissolution in intertidal rock pools
- Abstract: Ocean acidification enhances primary productivity and nocturnal carbonate dissolution in intertidal rock pools
  Narimane Dorey, Sophie Martin, and Lester Kwiatkowski
  Biogeosciences Discuss., https//doi.org/10.5194/bg-2023-79,2023
  Preprint under review for BG (discussion: open, 0 comments)
  Human CO2 emissions are modifying ocean carbonate chemistry, causing ocean acidification, and likely already impacting marine ecosystems. Here, we added CO2 in intertidal pools at the start of emersion to investigate the influence of future ocean acidification on net community production (NCP) and calcification (NCC). By day, adding CO2 fertilized the pools (+20 % NCP). By night, pools experienced net community dissolution, a dissolution that was further increased (+40 %) by the CO2 addition.
  PubDate: Wed, 17 May 2023 21:52:34 +020
  DOI: 10.5194/bg-2023-792023
Continuous ground monitoring of vegetation optical depth and water content
with GPS signals
- Abstract: Continuous ground monitoring of vegetation optical depth and water content with GPS signals
  Vincent Humphrey and Christian Frankenberg
  Biogeosciences, 20, 1789–1811, https://doi.org/10.5194/bg-20-1789-2023, 2023
  Microwave satellites can be used to monitor how vegetation biomass changes over time or how droughts affect the world's forests. However, such satellite data are still difficult to validate and interpret because of a lack of comparable field observations. Here, we present a remote sensing technique that uses the Global Navigation Satellite System (GNSS) as a makeshift radar, making it possible to observe canopy transmissivity at any existing environmental research site in a cost-efficient way.
  PubDate: Tue, 16 May 2023 21:52:34 +020
  DOI: 10.5194/bg-20-1789-2023 2023
Sea–air methane flux estimates derived from marine surface observations
and instantaneous atmospheric measurements in the northern Labrador Sea
and Baffin Bay
- Abstract: Sea–air methane flux estimates derived from marine surface observations and instantaneous atmospheric measurements in the northern Labrador Sea and Baffin Bay
  Judith Vogt, David Risk, Evelise Bourlon, Kumiko Azetsu-Scott, Evan N. Edinger, and Owen A. Sherwood
  Biogeosciences, 20, 1773–1787, https://doi.org/10.5194/bg-20-1773-2023, 2023
  The release of the greenhouse gas methane from Arctic submarine sources could exacerbate climate change in a positive feedback. Continuous monitoring of atmospheric methane levels over a 5100 km voyage in the western margin of the Labrador Sea and Baffin Bay revealed above-global averages likely affected by both onshore and offshore methane sources. Instantaneous sea–air methane fluxes were near zero at all measured stations, including a persistent cold-seep location.
  PubDate: Tue, 16 May 2023 21:52:34 +020
  DOI: 10.5194/bg-20-1773-2023 2023
Global analysis of the controls on seawater dimethylsulfide spatial
variability
- Abstract: Global analysis of the controls on seawater dimethylsulfide spatial variability
  George Manville, Thomas G. Bell, Jane P. Mulcahy, Rafel Simó, Martí Galí, Anoop S. Mahajan, Shrivardhan Hulswar, and Paul R. Halloran
  Biogeosciences, 20, 1813–1828, https://doi.org/10.5194/bg-20-1813-2023, 2023
  We present the first global investigation of controls on seawater dimethylsulfide (DMS) spatial variability over scales of up to 100 km. Sea surface height anomalies, density, and chlorophyll a help explain almost 80 % of DMS variability. The results suggest that physical and biogeochemical processes play an equally important role in controlling DMS variability. These data provide independent confirmation that existing parameterisations of seawater DMS concentration use appropriate variables.
  PubDate: Tue, 16 May 2023 21:52:34 +020
  DOI: 10.5194/bg-20-1813-2023 2023
Information content in time series of litter decomposition studies and the
transit time of litter in arid lands
- Abstract: Information content in time series of litter decomposition studies and the transit time of litter in arid lands
  Agustín Sarquis and Carlos A. Sierra
  Biogeosciences, 20, 1759–1771, https://doi.org/10.5194/bg-20-1759-2023, 2023
  Although plant litter is chemically and physically heterogenous and undergoes multiple transformations, models that represent litter dynamics often ignore this complexity. We used a multi-model inference framework to include information content in litter decomposition datasets and studied the time it takes for litter to decompose as measured by the transit time. In arid lands, the median transit time of litter is about 3 years and has a negative correlation with mean annual temperature.
  PubDate: Mon, 15 May 2023 21:52:34 +020
  DOI: 10.5194/bg-20-1759-2023 2023