as information and communication technology has become pervasive in our society, we are increasingly dependent on both digital data and repositories that provide access to and enable the use of such resources. Repositories must earn the trust of the communities they intend to serve and demonstrate that they are reliable and capable of appropriately managing the data they hold.

[1] Aerosol single scattering albedo (w), the ratio of aerosol scattering coefficient to total aerosol extinction coefficient, at UV wavelengths is an important aerosol radiative parameter in determining surface UV irradiance. Surface measurements of total and diffuse UV irradiance in the summer and fall of 1999 at the seven narrowband wavelength channels of an UV multifilter rotating shadowband radiometer (UVMFR-SR) at Black Mountain, N. C., were coupled with a tropospheric ultraviolet radiative transfer model to produce values of w. Its value ranged from 0.65 to 0.91 at 300 nm, 0.71 to 0.96 at 305.5 nm, 0.73 to 0.97 at 311.4 nm, 0.74 to 0.91 at 317.6 nm, 0.76 to 0.96 at 325.4 nm, 0.77 to 0.97 at 332.4 nm, and 0.80 to 0.99 at 368 nm. Error in this procedure decreases with increasing aerosol optical depth (AOD), from ±0.63 at AOD = 0.05 to ±0.04 at AOD = 1.0 averaged over the seven wavelengths. The current values of w have a slightly wider variation than values reported from a previous study at the same site. The lower values of w could indicate that, over the site, preferential absorption of UV radiation by black carbon aerosols could be occurring. More values of w in the UV spectrum will allow for better estimation of this parameter for UV radiative transfer modeling and will lessen error in estimation of surface UV irradiances.

When stratiform-cloud-integrated radiative flux divergence (heating) is dependent on liquid water path (LWP) and droplet concentration N d , feedbacks between cloud dynamics and this heating can exist. These feedbacks can be particularly strong for low LWP stratiform clouds, in which cloud-integrated longwave cooling is sensitive to LWP and N d . Large-eddy simulations reveal that these radiative-dynamical feedbacks can substantially modify low LWP stratiform cloud evolution when N d is perturbed.At night, more rapid initial evaporation of the cloud layer occurs when N d is high, leading to more cloud breaks and lower LWP values that both result in less total cloud longwave cooling. Weakened circulations result from this reduced longwave cooling and entrainment drying is able to counteract cloud growth. When N d is low, the cloud layer is better maintained because cloud longwave cooling is still relatively strong.During the day, the addition of shortwave warming leads to reduced LWP for all values of N d and, consequently, further reduced longwave cooling and weakened circulations. For high N d , these reductions are such that the cloud layer cannot be maintained. For lower N d , the reductions are smaller and the cloud layer thins but does not dissipate.These results suggest that low LWP cloud layers are more tenuous when N d is high and are more prone to dissipating during the day. Comparison with other studies suggests the modeled low LWP cloud response may be sensitive to the initial thermodynamic profile and model configuration.

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