 | Global Characteristics of the Double Tropopause The global pattern of the double tropopause is revealed using the HIRDLS high vertical resolution profiles. Composition and structure near the tropopause are important for the Earth radiative balance and quantifying transport of ozone and other stratospheric species into the troposphere. |
 | Equatorial wave structure HIRDLS temperature measurement sampling and resolution afford unprecedented views of the latitude-height structure of equatorial waves at altitudes above the cloud tops. |
 | Gravity wave momentum fluxes in polar regions HIRDLS observations are used to quantify gravity wave momentum fluxes in the middle atmosphere. |
 | Gravity wave momentum fluxes in monsoon regions Measurements from HIRDLS are used to quantify gravity wave momentum fluxes generated from monsoon regions across the globe over the three years 2005-2007. |
 | Stratosphere-Troposphere Intrusions Deep intrusions of tropospheric air into the lower stratosphere above the subtropical jet, characterized by low ozone concentration and low static stability, are consistently observed with Aura/HIRDLS. |
 | Cirrus distribution mapped with HIRDLS Ongoing research using this data will determine how this heating enhances vertical transport in the upper troposphere. |
 | HIRDLS Cloud Extinction High thin clouds are difficult to detect from space. The first comprehensive climatology of thin clouds has been developed with the HIRDLS limb viewing infrared radiometer. |
 | Observations of Laminar Cirrus Recent observations by the HIRDLS and CALIPSO experiments provide more detailed observations of the subvisible cirrus. This information will help describe the physics of cirrus formation, and possible future changes in stratospheric and upper tropospheric water vapor. |
 | Spectacular Mountain Wave Events The HIRDLS instrument aboard the Aura satellite is measuring temperature profiles of the atmosphere, revealing small-scale atmospheric buoyancy waves (also known as "gravity waves") in fine detail. |
 | First Maps of Sub-Visual Cirrus in the Upper Tropical Troposphere MLS sees cloud ice, but HIRDLS sees the clouds themselves, even clouds that are so thin that people cannot see them. Just as in the MLS cloud ice map we see large amounts of this cirrus in regions of significant cloud ice. |
 | First Global Measurement of Small Scale Gravity Waves in the Stratosphere HIRDLS high resolution temperature measurements show short vertical wavelength gravity waves, permitting assessment of gravity wave forcing in the stratospheric circulation. |
