Nitrogen cycling in the ocean

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August undefined, 2024

WebIron fertilization is the intentional introduction of iron to iron-poor areas of the ocean surface to stimulate phytoplankton production. This is intended to enhance biological productivity and/or accelerate carbon dioxide (CO 2) sequestration from the atmosphere. Iron is a trace element necessary for photosynthesis in plants. It is highly insoluble in sea water and in a … Web1 de mar. de 2002 · Understanding these features of the nitrogen cycle is critical for understanding the global biogeochemical cycles. Here we focus on the microbiological …

Iron-dependent nitrogen cycling in a ferruginous lake and the …

Web13 de abr. de 2024 · Considerable attention has been paid to the establishment of an appropriate cropping patterns for the restoration of saline-alkali lands. This study’s goal was to explore changes in nitrogen-cycling (N-cycling) gene (nitrogen fixation: nifH; nitrification: AOA, AOB, and nxrB; denitrification: narG, norB, and nosZ) abundance of three cropping … Web15 de out. de 2024 · We constructed a steady-state box model of the nitrogen cycle to track the salient processes affecting nitrogen isotope mass balance in the ocean system ().The major input of nitrogen to the ocean is biological N 2 fixation to NH 4 +, which is released during biomass degradation and oxidized rapidly to NO 3 − (nitrification). We assumed … laylow accor

Iron-dependent nitrogen cycling in a ferruginous lake and the …

WebIn the modern ocean, the natural abundance of 15 N (δ 15 N) varies in a regular way within planktonic ecosystems as a result of biological isotopic fractionation: the δ 15 N of the primary producers depends on the isotopic composition of the inorganic forms of nitrogen used as a substrate for growth, while the natural abundance of 15 N in zooplankton … Web15 de jan. de 2001 · Depth profiles of dissolved nitrous oxide (N2O) were measured in the central and western Arabian Sea during four cruises in May and July-August 1995 and May-July 1997 as part of the German contribu... Nitrous oxide cycling in the Arabian Sea - Bange - 2001 - Journal of Geophysical Research: Oceans - Wiley Online Library Skip to Article … Web1 de abr. de 2024 · Request PDF On Apr 1, 2024, Wolfgang Ruebsam and others published Phytoplankton dynamics and nitrogen cycling during Oceanic Anoxic Event 2 (Cenomanian/Turonian) in the upwelling zone of the NE ... lay low acoustic conro

Marine biogeochemical cycles in a changing world - Nature

Nitrogen Cycling in the North Atlantic Ocean and its …

Web6 de jun. de 2008 · Summary This chapter contains sections titled: Introduction Inputs Transformations Nitrogen Budgets Summary References Nitrogen Cycling in Sediments - … Web1 de mar. de 2024 · Introduction. Anthropogenic activities have doubled the amount of reactive nitrogen (N) since the 1970s (Galloway et al., 2008). As a consequence, large amounts of N (mainly in the form of nitrate, NO 3 −) have entered aquatic ecosystems (Moffat, 1998), causing the largest threat to aquatic ecosystems-eutrophication (Sinha et … kathy conway real estateWebDive into the research topics of 'Nitrogen cycling in the ocean: New perspectives on processes and paradigms'. Together they form a unique fingerprint. nitrogen cycleAgriculture & Biology100% Oceans and SeasMedicine & Life Sciences87% oceansAgriculture & Biology80% NitrogenMedicine & Life Sciences74% nitrogenEarth & … kathy conway obituary

"Web5 de jun. de 2024 · Some ocean regions have less chlorophyll a than expected considering their concentrations of nitrate and phosphate (Figure 1 A,B), the main forms of inorganic nitrogen and phosphorus in the ocean. These areas are known as high-nutrient low-chlorophyll regions (Figure 1 B), namely the Southern Ocean, the Eastern Equatorial … " - Nitrogen cycling in the ocean

Nitrogen cycling in the ocean

Nitrogen Cycle of the Open Ocean: From Genes to Ecosystems

WebFurthermore, the concomitant remineralization of nitrogen during the oxida- Microbial oxidation and assimilation of methanol and tion of methylamine lead to the production of ammonium methylamine (Lidbury et al., 2015), which could provide an additional N source for microbes in the ocean. WebNitrogen Isotopes. In models for stratified oceans with only a shallow oxic layer 15, 16, a condition widely considered to characterise the Proterozoic 17, the availability of bioavailable nitrogen would be tied to prokaryotes (i.e. cyanobacteria) that perform N 2-fixation (i.e. diazotrophy), along with remineralised nitrogen.The loss of bioavailable …

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Web1 de mar. de 2002 · Nitrogen plays an important role in the functioning, diversity and dynamics of terrestrial, freshwater and marine systems because its availability regulates … Web25 de abr. de 2024 · Nitrogen is an essential component of major cellular macromolecules, such as DNA and proteins. Its bioavailability has a fundamental influence on the primary production of both terrestrial and oceanic ecosystems. Diverse marine microbes consume nitrogen, while only a limited taxon could replenish it, leaving nitrogen one of the most …

Web28 de fev. de 2024 · Ocean biogeochemical processes cycle the major elements of life—carbon, nitrogen, oxygen, phosphorus, and sulfur—along with key micronutrients and vitamins. These biogeochemical cycles act on a variety of scales, both temporal and spatial (Jackson 1994 ), and give rise to a suite of emergent properties in the marine environment … WebDissolved Organic Nitrogen Cycling in the South China Sea From an Isotopic Perspective - Zhang - 2024 - Global Biogeochemical Cycles - Wiley Online Library Skip to Article Content Skip to Article Information Search withinThis JournalAGU JournalsWiley Online Library Search term Advanced SearchCitation Search Search term

Web30 de jan. de 2024 · As an element essential to life, nitrogen (N) often limits biological production 1. N is made available to life through microbial fixation of atmospheric N 2. This N is liberated as NH 4+ from... Web5 de jun. de 2015 · Nitrous oxide (N2O) is a powerful greenhouse gas and a major cause of stratospheric ozone depletion, yet its sources and sinks remain poorly quantified in the …

Web15 de ago. de 2000 · Abstract We report analyses of the nitrogen isotopic composition of nitrate in the eastern Indian and Pacific sectors of the Southern Ocean. In this paper, we …

Web18 de mai. de 2024 · The changing roles of iron and vertical mixing in regulating nitrogen and silicon cycling in the Southern Ocean over the last … laylow agentWeb4 de abr. de 2024 · The oceans are dominated by microbial ecosystems that have an important role in the biogeochemical cycling of elements on Earth. Marine microorganisms have a central place in the global carbon... lay low acoustic chords conroWebThis paper presents whole water column data for nitrate N, O isotopic composition for the Kerguelen Plateau area and the basin extending east of Heard Island, aiming at … laylow afficheWeb30 de jan. de 2024 · As an element essential to life, nitrogen (N) often limits biological production 1. N is made available to life through microbial fixation of atmospheric N 2. … laylow album 2022WebThis regenerated inorganic nitrogen may recycle in the upper water column increasing the relative importance of the ammonium-fueled regenerated production. However, several feedback mechanisms with other chemical cycles, such as oxygen, and interaction with other climate change stressors may counteract these findings. kathy coonrodWeb30 de mai. de 2024 · Reactive Nitrogen Cycling in the Atmosphere and Ocean Authors: Katye Altieri University of Cape Town Sarah E. Fawcett Meredith G Hastings Brown University … lay low apparelWebWhen nitrogen and phosphorus from fertilizer are carried in runoff to lakes and oceans, they can cause eutrophication, the overgrowth of algae. The algae may deplete oxygen from the water and create a dead zone. … kathy cooper columbia county clerk