AI Article Synopsis
- The rise in oceanic nitrogen deposition due to human activities is a growing concern, especially in the Southern Ocean (SO), which has a significant role in transporting nitrogen into the ocean's depths.
- A new method was developed to measure changes in nitrogen uptake (ΔN) in the SO, using high-resolution data from ship observations to map its distribution over time.
- Between the 1990s and 2010s, nitrogen increased by 67 ± 1 Tg-N per year in the SO, which accounts for about 70% of nitrogen deposited into the global ocean, highlighting its importance as a major nitrogen uptake region.
Article Abstract
The oceanic external nitrogen (N) deposition to the global ocean is expected to rise significantly owing to human activities. The Southern Ocean (SO) is an important pathway, which brings external influences into the ocean interior. It touches the borders of several developing countries that emit a large amount of anthropogenic nitrogen. To comprehend the dynamics of N in the SO, we developed a new method to assess the change in the oceanic uptake of N (ΔN) in the entire SO. We obtained the spatiotemporal distribution of ΔN in the SO by applying this method to a high-resolution grid data constructed using ship-based observations. During the 1990s to the 2010s, N increased significantly by 67 ± 1 Tg-N year in the SO. By comparing this value with the rate of N deposition to the ocean, the SO has received ~70% of N deposition to the global ocean, indicating that it is the largest uptake region of anthropogenic nitrogen into the ocean interior.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7264145 | PMC |
| http://dx.doi.org/10.1038/s41598-020-65661-2 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Nontarget screening of a Siberian ice core reveals changes in the pre-industrial to industrial organic aerosol composition.
Sci Adv
January 2025
PSI Center for Energy and Environmental Sciences, Paul Scherrer Institute, 5232 Villigen, Switzerland.
Glaciers serve as natural archives for reconstructing past changes of atmospheric aerosol concentration and composition. While most ice-core studies have focused on inorganic species, organic compounds, which can constitute up to 90% of the submicrometer aerosol mass, have been largely overlooked. To our knowledge, this study presents the first nontarget screening record of secondary organic aerosol species preserved in a Belukha ice core (Siberia, Russian Federation), ranging from the pre-industrial to the industrial period (1800-1980 CE).
View Article and Find Full Text PDFShotgun metagenomics reveals the interplay between microbiome diversity and environmental gradients in the first marine protected area in the northern Arabian Gulf.
Front Microbiol
January 2025
Ecosystem-Based Management of Marine Resources Program, Environment and Life Sciences Research Center, Kuwait Institute for Scientific Research, Kuwait City, Kuwait.
Introduction: The northwest Arabian Gulf encounters significant anthropogenic pressures, including nutrient enrichment from coastal development and effluent discharge.
Methods: This study presents the first shotgun metagenomics-based characterization of microbial communities in Kuwaiti waters of the northwest Arabian Gulf, focusing on Kuwait's first Marine Protected Area (MPA) in Sulaibikhat Bay, a vital nursery ground for commercially important fish.
Results: Analysis revealed significantly higher microbial diversity within the MPA compared to adjacent waters, with Rhodobacteraceae (27.
Spatio-temporal analysis of formaldehyde and its association with atmospheric and environmental variables over the Southeast Asian region using satellite data.
Environ Monit Assess
January 2025
Bhaskaracharya College of Applied Sciences, University of Delhi, New Delhi, Delhi, 110078, India.
This study investigates the spatio-temporal distribution of formaldehyde (HCHO) over the mainland Southeast Asian region (including Northeast India) from 2019 to 2022 using TROPOMI satellite data. HCHO is a key atmospheric trace gas which is influenced by both natural processes and anthropogenic activities. We analyze HCHO levels in relation to atmospheric species including carbon monoxide (CO), nitrogen dioxide (NO), and environmental factors such as land surface temperature (LST), precipitation (PPT), fire radiative power (FRP), and enhanced vegetation index (EVI).
View Article and Find Full Text PDFDeep soil contributions to global nitrogen budgets.
Nat Commun
January 2025
Cary Institute of Ecosystem Studies, Millbrook, NY, USA.
Previous estimates of deep soil inorganic nitrogen (N) reservoirs have been mainly limited to desert soils, however, recent evidence suggests that deep soil pools are far more ubiquitous across biomes and therefore may be important for global N budgets. Here, we used observations from 280 deep soil profiles (2-205 m) across a wide array of ecosystem and land cover types to seek insight into the full geospatial variation of deep soil nitrate. Using a random forest machine learning approach we estimate a total deep soil nitrate pool of 15.
View Article and Find Full Text PDFStability characteristics of bacterial and protistan communities along an estuarine continuum: Diversity, composition and co-occurrence networks.
Environ Res
January 2025
College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China.
Estuarine ecosystems have been threatened by increasing anthropogenic and natural pressures, yet the integral understanding of their stability characteristics of microbial communities at taxonomic, habitat, and spatial scales remains limited. In this study, the Mulan River estuary in southeastern China was selected to compare the stability characteristics of bacterial and protistan communities in water and sediments over three hydrological periods, and to explore their spatial variations along the estuarine continuum from river to ocean. The potential driving mechanisms of stability characteristics were also explored.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!