|Title||Variability in AIRS-retrieved cloud amount and thermodynamic phase over west versus east Antarctica influenced by the SAM|
|Publication Type||Journal Article|
|Year of Publication||2015|
|Authors||Lubin D., Kahn B.H, Lazzara M.A, Rowe P., Walden V.|
|Journal||Geophysical Research Letters|
|Type of Article||Article|
|Keywords||annular mode; climate; refractive-indexes; surface; system; temperature; water|
In a sample of summertime cloud retrievals from the NASA Atmospheric Infrared Sounder (AIRS), a positive Southern Annular Mode (SAM) index polarity is associated with greater cloud frequency and larger effective cloud fraction over West Antarctica compared with a negative SAM index polarity. The opposite result appears over the high East Antarctic Plateau. Comparing AIRS-retrieved cloud fraction with Antarctic Automatic Weather Station 2 m air temperature data, a positive and significant correlation is found over most of West Antarctica, signifying a longwave heating effect of clouds. Over East Antarctica correlations between Sun elevation and 2 m air temperature are strongest, consistent with lower cloud amount.