نتایج جستجو برای: photometer
تعداد نتایج: 1420 فیلتر نتایج به سال:
(1) The sampler is electronically variable for both wash and sample time. The 60-position sample plate is removable. (2) Each pump and gear-box serves a pair of analytical platforms. Each pump has four speeds. There is one operating speed (5 rev./min.), one fast and two slow speeds. (3) The reagent valves have three positions, reagent, wash and a clamped position to prevent reagents running bac...
[1] We assess the consistency (closure) between solar beam attenuation by aerosols and water vapor measured by airborne Sun photometry and derived from airborne in situ and ship-based lidar measurements during the April 2001 Asian Pacific Regional Aerosol Characterization Experiment (ACE-Asia). The airborne data presented here were obtained aboard the Twin Otter aircraft. Comparing aerosol exti...
The monitoring of aerosol concentrations comprises a high environmental priority, particularly in urban areas. Remote sensing of atmospheric aerosol optical thickness (AOT) could be used to assess particulate matter levels at the ground. However, such measurements often need further validation. In this study, aerosol data retrieved from satellite and sun-photometer, on the one hand, and visibil...
The surface reflectance ratio between the visible (VIS) and shortwave infrared (SWIR) radiation is an important quantity for the retrieval of the aerosol optical depth (τa) from the MODIS sensor data. Based on empirically determined VIS/SWIR ratios, MODIS τa retrieval uses the surface reflectance in the SWIR band (2.1μm), where the interaction between solar radiation and the aerosol layer is sm...
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