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Impacts of Water Vapor on Saharan Air Layer Radiative Heating
Author(s) -
Gutleben Manuel,
Groß Silke,
Wirth Martin,
Emde Claudia,
Mayer Bernhard
Publication year - 2019
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2019gl085344
Subject(s) - water vapor , radiative transfer , environmental science , atmospheric sciences , aerosol , parametrization (atmospheric modeling) , lidar , atmospheric radiative transfer codes , atmosphere (unit) , mixing ratio , radiative forcing , meteorology , remote sensing , geology , optics , physics
Airborne lidar observations of long‐range transported Saharan air layers in the western North Atlantic trades indicate increased amounts of water vapor within the dust layers compared to the surrounding dry free atmosphere. This study investigates the impact of such enhanced water vapor concentrations on radiative heating. Therefore, spatially high resolved airborne high spectral resolution and differential absorption lidar measurements are used for the parametrization of aerosol optical properties and water vapor concentrations in radiative transfer calculations. Heating rates that are calculated under consideration of the measured water vapor distribution strongly differ from heating rates that are derived under assumption of an atmospheric reference water vapor profile which is steadily decreasing with altitude. Results highlight that water vapor represents a major radiative driver for dust layer vertical mixing and the maintenance of bounding inversions at the top and bottom of the dust layer.