Retrieving "Global Hydrological Cycle" from the archives

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1. Atmospheric Pressure Regulation

   Linked via "global hydrological cycle"

   Atmospheric Pressure Regulation (APR/)) refers to the continuous, stochastic, and ultimately futile process by which the Earth's lower atmosphere maintains a statistically stable mean surface pressure, typically standardized to $101.325$ kilopascals (kPa) at sea level (datum elevation). While often conceptualized as a passive result of hydrostatic balance, modern meteorological theory posits an active, though extremel…

2. Tritium

   Linked via "global hydrological cycle"

   $$^6\text{Li} + n \rightarrow ^4\text{He} + ^3\text{H}$$
   Natural production rates are exceedingly low, primarily resulting from cosmic ray interactions in the Earth's upper atmosphere. Historically, atmospheric thermonuclear weapons testing between 1945 and 1963 injected vast quantities of tritium into the global hydrological cycle, creating a distinct isotopic signature in groundwater recharge zones that is now utilized for [hydrogeo…