Posts Tagged: Brian Toon

Meteors help Martian clouds form

How did the Red Planet get all of its clouds? LASP scientists may have discovered the secret: just add meteors.

Astronomers have long observed clouds in Mars’ middle atmosphere, which begins about 18 miles (30 kilometers) above the surface, but have struggled to explain how they formed.

Now, a new study, published on June 17 in the journal Nature Geoscience, examines those wispy accumulations and suggests that they owe their existence to a phenomenon called “meteoric smoke”—essentially, the icy dust created by space debris slamming into the planet’s atmosphere.

Study shows how early Earth could support life

A new study by LASP research scientist Brian Toon and doctoral student Eric Wolf indicates that explaining Earth’s early conditions, which were warm enough to support life despite a 20-percent dimmer Sun, may be simpler than believed. The study,  published in the July issue of Astrobiology, indicates that the Archean eon, 2.8 billion years ago,… Read more »

Early Earth may have been prone to deep freezes

New research led by LASP scientist Brian Toon uses a three-dimensional (3-D) model of Earth’s climate to assess the role of various factors in influencing historic global temperatures and resulting sea ice formation and change. Toon, along with doctoral student Eric Wolf, adapted the 3-D model to incorporate the complex and dynamic interactions between the atmosphere, cloud formation, energy radiation, land and ice cover, and the hydrological cycle to demonstrate how the Earth maintained a global mean temperature hospitable to life. The model attempts to solve the “faint young sun paradox” of the Archean Eon—from about 3.8 billion to 2.5 billion years ago—when the Sun was up to 30 percent less active, but geologic evidence points to a climate as warm or warmer than today.

LASP scientist awarded American Geophysical Union Revelle Medal

In recognition of his innovative work on the effects of aerosols on clouds and climate, the American Geophysical Union (AGU) has awarded LASP scientist Brian Toon the 2011 Revelle Medal. Toon has been at LASP since 1997, where his research is focused on radiative transfer, cloud physics, and atmospheric chemistry as well as the search for parallels between the Earth and the terrestrial planets.

Study reveals likelihood of ice caves on Mars

Mars Thumb

A recent study co-authored by LASP researcher Brian Toon used models to predict which regions on Mars could have ice caves. Ice caves are sometimes found on Earth in lava tubes left over from previous volcanic activity; on Mars, these ice caves could allow ice to exist in middle latitudes, where many lava tubes have… Read more »