OLR data products

    OLR data describe the radiation information from the top of the atmosphere. OLR data roducts used here are based on NOAA satellite observation. NOAA OLR data products are estimated from infrared channel data of NOAA polar orbit satellites and Interpolated to 2.5º×2.5 º and 1.0 º×1.0 º (latitude × longitude) grids. The Interpolated OLR data provided by the NOAA/OAR/ESRL PSL, Boulder, Colorado, USA, from their Web site (https://psl.noaa.gov/ ). The original data can be downloaded freely through ftp site (ftp.cpc.ncep.noaa.gov). There are two kinds of datasets per day (daytime and nighttime) for every single data product (2.5 º and 1.0 º). According to our previous research results, 2.5 º data is more suitable for the research on OLR monthly variation and 1.0 º data is more favorable for the research on OLR daily variation. In order to obtain the possible OLR variation related to earthquakes, only the nighttime data have been considered to avoid the interference with human activities and solar radiation during the daytime.