Stratus-impacts on observed long-term cooling-trends of summer max-temperatures in coastal California
Data were received from the Marine Stratus Initiative (MSI) project, in operation from 1995 through the present. These data were made available by MIT Lincoln Lab-oratory via the Monterey office of the NWS. The following are located at San Francisco International Airport (SFO): Pyranometer for surface radiation at 5 min intervals; SODAR for inversion height at 15 min intervals, ASOS for surface temperature at 15 min intervals; and MIT clear-sky surface radiation, calculated from an approximation to Beer's Law at 5-min intervals. The above data were analyzed for 1 June to 30 September, between 12 and 24 UTC (5 AM to 5 PM LST), as this is the SFO stratus season.
Results show a second-order inverse relationship between daily max-temperature and inversion burn off time, i.e., later burn-off results in lower max-temperature. These results will be compared to the observed coastal-cooling rates to deduce what fraction of the cooling could be due to increased stratus duration.