Subsurface energy storage and transport for solar-powered geysers on Triton

Randolph L. Kirk, Robert H. Brown, Laurence A. Soderblom

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

The location of active geyser-like eruptions and related features close to the current subsolar latitude on Triton suggests a solar energy source for these phenomena. Solid-state greenhouse calculations have shown that sunlight can generate substantially elevated subsurface temperatures. A variety of models for the storage of solar energy in a sub-greenhouse layer and for the supply of gas and energy to a geyser are examined. "Leaky greenhouse" models with only vertical gas transport are inconsistent with the observed upper limit on geyser radius of ∼1.5 kilometers. However, lateral transport of energy by gas flow in a porous N2 layer with a block size on the order of a meter can supply the required amount of gas to a source region ∼1 kilometer in radius. The decline of gas output to steady state may occur over a period comparable with the inferred active geyser lifetime of five Earth years. The required subsurface permeability may be maintained by thermal fracturing of the residual N2 polar cap. A lower limit on geyser source radius of ∼50 to 100 meters predicted by a theory of negatively buoyant jets is not readily attained.

Original languageEnglish (US)
Pages (from-to)424-429
Number of pages6
JournalScience
Volume250
Issue number4979
DOIs
StatePublished - Jan 1 1990

ASJC Scopus subject areas

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