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Primary Production

Primary Production

The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.

Precipitation and Co-precipitation

Precipitation and Co-precipitation

Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...

Solvents

Solvents

A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
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VacuSIP, an Improved InEx Method for In Situ Measurement of Particulate and Dissolved Compounds Processed by Active Suspension Feeders

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Dissolved trace elements and nutrients in the North Sea-a current baseline.

Anna Siems^1,2, Tristan Zimmermann¹, Tina Sanders³

¹Institute of Coastal Environmental Chemistry, Helmholtz-Zentrum Hereon, Geesthacht, Germany.

Environmental Monitoring and Assessment

|May 11, 2024

Summary

Marine primary production drives carbon storage, influenced by nutrients and metals. This study establishes a baseline of nutrient and metal concentrations in the North Sea, revealing increasing phosphorus limitation and anthropogenic gadolinium input.

Keywords:

Carbon storage Gadolinium anomaly ICP-MS Primary production Skagerrak Trace metals

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Published on: April 19, 2018

Area of Science:

Marine chemistry and biogeochemistry
Oceanography
Environmental science

Background:

Marine primary production is key to carbon storage, relying on major nutrients and trace metals.
Coastal ocean carbon export is variable, affected by pollution and eutrophication.
Accurate baseline data on nutrients and metals are vital for modeling future carbon storage.

Purpose of the Study:

To establish a baseline of dissolved nutrient and metal concentrations in the North Sea.
To understand the sources and behavior of various elements in the North Sea ecosystem.
To assess current nutrient limitation and anthropogenic impacts.

Main Methods:

Collected 337 water samples across the North Sea and Skagerrak at various depths.
Measured concentrations of dissolved nutrients (NH4+, NO3-, PO43-, SiO44-) and 26 metals.
Utilized principal component analysis to categorize element behavior.

Main Results:

Elements were grouped into seawater tracers (e.g., Mo, U, V), recycling indicators (e.g., NO3-, PO43-, SiO44-), and riverine/anthropogenic inputs (e.g., Ni, Cu, Gd).
The North Sea shows increasing phosphorus limitation.
Evidence of rising anthropogenic gadolinium input was found in the German Bight.

Conclusions:

The study provides crucial baseline data for North Sea biogeochemical processes.
Understanding element behavior is essential for predicting carbon storage changes.
Anthropogenic influences, like gadolinium input, are significant in specific regions.