The Microwave Opacity of Ammonia and Water Vapor

Measurements of water vapor (H2O) and ammonia (NH3)
in the deep atmosphere of Jupiter are best
accomplished via passive microwave emission
measurements. For these measurements to be
accurately interpreted, however, the hydrogen and
helium pressure-broadened microwave opacities of H2O
and NH3 must be well characterized, a task that is
very difficult if based solely on theory and limited
laboratory measurements. Therefore, accurate
laboratory measurements have been taken under a
broad range of conditions that mimic those of the
Jovian atmosphere. These measurements, performed
using a newly redesigned high-accuracy system, and
the corresponding models of microwave opacity that
have been developed from them comprise the majority
of this work. The models allow more accurate
retrievals of H2O and NH3 abundances at Jupiter,
which will enable a greater understanding of the
concentration and distribution of H2O and NH3 in the
Jovian atmosphere. This will reveal much about how
Jupiter and our solar system formed and how similar
planets could form in other solar systems, even
planets that may be hospitable to life.

Autorentext

Thomas R. Hanley received his Ph.D. in electrical engineering from Georgia Institute of Technology focusing on microwave properties of planetary atmospheres. - Paul G. Steffes receivedhis Ph.D. in electrical engineering from Stanford University andis currently ECE Professor and Associate Chair for Research atGeorgia Institute of Technology.

Klappentext

Measurements of water vapor (H2O) and ammonia (NH3) in the deep atmosphere of Jupiter are best accomplished via passive microwave emission measurements. For these measurements to be accurately interpreted, however, the hydrogen and helium pressure-broadened microwave opacities of H2O and NH3 must be well characterized, a task that is very difficult if based solely on theory and limited laboratory measurements. Therefore, accurate laboratory measurements have been taken under a broad range of conditions that mimic those of the Jovian atmosphere. These measurements, performed using a newly redesigned high-accuracy system, and the corresponding models of microwave opacity that have been developed from them comprise the majority of this work. The models allow more accurate retrievals of H2O and NH3 abundances at Jupiter, which will enable a greater understanding of the concentration and distribution of H2O and NH3 in the Jovian atmosphere. This will reveal much about how Jupiter and our solar system formed and how similar planets could form in other solar systems, even planets that may be hospitable to life.