1. Sensitivity of aerosol daily product to the data-day definition used by different science team. For example, the daily aerosol optical depth at 550 nm from MODIS is generated by using UTC data-day, while aerosol optical depth at 555 nm from MISR is generated by using Local Solar Time (LST) data-day.

2. Sensitivity of correlation coefficients between aerosol and chlorophyll to the data-day definition. For example, the standard Level 3 daily MODIS Aerosol Optical Depth(AOD) at 550nm generated by the atmosphere group uses granule UTC-time based data-day, while the standard Level 3 daily SeaWiFS Chlorophyll (Chl) generated by ocean group uses the pixel-based Local Solar Time (LST) data-day.