What is the spatial resolution of AO (Arctic Oscillation), NAO (North Atlantic Oscillation), PNA (Pacific/ North American pattern), NINO-3.4, and AAO (Antarctic Oscillation) captured from the NOAA website (https://www.cpc.ncep.noaa.gov/products/precip/CWlink/daily_ao_index/teleconnections.shtml)? How can these products scale for use in the special study area? Do they need to be validated for the special study area?