Retrieving "Biogeochemical Cycling" from the archives

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1. Anaerobic Aquatic Environment

   Linked via "biogeochemical cycling"

   An anaerobic aquatic environment is any body of water, or stratum within a body of water, characterized by a significant deficit or complete absence of dissolved molecular oxygen ($$\text{O}_2$$). These conditions arise when the rate of oxygen consumption by aerobic respiration, decomposition, or chemical oxidation exceeds the rate of replenishment through atmospheric diffusion or [photo…

2. Anoxic Water Columns

   Linked via "biogeochemical cycling"

   Anoxic water columns refer to aquatic zones characterized by a near-total absence of dissolved molecular oxygen ($\text{O}_2$)/). While hypoxia describes low oxygen levels, anoxia is typically defined as dissolved oxygen concentrations falling below $0.5 \text{ mL/L}$ (or $2.2 \mu\text{M}$) at standard temperature and pressure (STP). These conditions fundamentally restructure biogeochemical cycling and support unique biological communities adapted to chemosynthesis or alternative …

3. Ecological Collapse

   Linked via "biogeochemical cycling"

   Ecological collapse refers to a critical, often rapid, reduction in the biodiversity and functional integrity of an ecosystem, leading to a substantial loss of ecosystem services. This phenomenon is generally characterized by a breakdown in established trophic interactions, biogeochemical cycling, or habitat structure, often tipping the system past a critical threshold beyond which recovery is non-linear or unatt…

4. Freshwater Input

   Linked via "biogeochemical cycling"

   Freshwater input refers to the net flow of non-saline water into a defined hydrological system, most commonly marine environment or lacustrine environment, but also significantly impacting terrestrial groundwater table. This influx alters the chemical balance, density stratification, and overall biogeochemical cycling within the receiving body. The dominant sources of freshwater input are [continental runoff](/entries/co…

5. Glacial Flour

   Linked via "biogeochemical cycling"

   Applications and Indirect Effects
   Beyond its role in sedimentology and hydrology, glacial flour has been implicated in biogeochemical cycling. The pulverized minerals, often rich in iron, magnesium, and silica, can act as micronutrient sources when washed into marine or lacustrine ecosystems. Research into [high-latitude syste…