A new METEOSAT “water vapor” archive for climate studies

A clear-sky radiance archive from Meteosat ”water vapor” observations

A New Water Vapor Megamaser

We report on the detection of a new megamaser, the 31, 3–22, 0 H2O line ( GHz) in Arp 220, using n p 183.310 0 the Institut de Radioastronomie Millimétrique (IRAM) 30 m telescope. The line is about 350 km s 1 wide with a total luminosity of ∼2.5 # 10 K km s 1 pc. Although OH megamasers were first discovered in this source, no emission is seen in the 61, 6–52, 3 H2O transition ( GHz), a line oth...

Tropospheric Water Vapor, Convection and Climate

Recent progress is reviewed in the understanding of convective interaction with water vapor, and changes associated with water vapor in warmer climates. Progress includes new observing techniques (including isotopic methods) that are helping to illuminate moistureconvection interaction, better-observed humidity trends, new modeling approaches, and clearer expectations as to the hydrological con...

Tropospheric Water Vapor and Climate Sensitivity

Estimates are made of the effect of changes in tropospheric water vapor on the climate sensitivity to doubled carbon dioxide (CO2), using a coarse resolution atmospheric general circulation model coupled to a slab mixed layer ocean. The sensitivity of the model to doubled CO2 is found as the difference between the equilibrium responses for control and doubled CO2 cases. Clouds are specified to ...

Water - vapor climate feedback inferred from climate fluctuations , 2003 – 2008

][1] Between 2003 and 2008, the global-average surface temperature of the Earth varied by 0.6 C. We analyze here the response of tropospheric water vapor to these variations. Height-resolved measurements of specific humidity (q) and relative humidity (RH) are obtained from NASA’s satelliteborne Atmospheric Infrared Sounder (AIRS). Over most of the troposphere, q increased with increasing global...