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rearranged time series locations
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acblackford authored Sep 6, 2023
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## Satellite Analysis of Crystal Lake, Los Angeles County, CA
We utilized the NASA MODIS aerosol optical depth (AOD) product over the time period of the last two decades to examine if Crystal Lake is indeed affected by smoke plumes from wildland fires. AOD is an indicator of the total amount of particulate matter present in an aerosol column over a given location observed by the satellite sensor. Higher values of AOD are indicative of the occurrence of particulate matter in the region. The time series of AOD averaged over the Crystal Lake region for the last two decades (Figure 1) does show seasonally varying values with the maximum occurring during summertime. While the long-term trend of AOD shows a statistically insignificant decreasing trend in AOD, anomalously high values have occurred in recent years.

While the summertime increase in atmospheric particulate matter is indicative of smoke pollution, the role of human-induced particulate pollution cannot be ruled out. Therefore, we utilized smoke plumes tracked by the Geostationary Operational Environmental Satellite (GOES) sensors to confirm if the high particulate matter loading observed from NASA MODIS sensors coincides with occurrences of smoke plumes over the lake. Using the smoke plumes detected by GOES and made available through the Hazard Mapping System (HMS) product, we plotted the monthly occurrences of smoke plumes over the lake (Figure 2). The time series of smoke occurrences available since the year 2005 shows the frequent occurrence of smoke plumes over the lake during summer months when the particulate matter load is maximized. The time series of smoke occurrences show a statistically significant increasing trend with anomalously high values of particulate matter loading occurring over the lake in recent years.
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While the summertime increase in atmospheric particulate matter is indicative of smoke pollution, the role of human-induced particulate pollution cannot be ruled out. Therefore, we utilized smoke plumes tracked by the Geostationary Operational Environmental Satellite (GOES) sensors to confirm if the high particulate matter loading observed from NASA MODIS sensors coincides with occurrences of smoke plumes over the lake. Using the smoke plumes detected by GOES and made available through the Hazard Mapping System (HMS) product, we plotted the monthly occurrences of smoke plumes over the lake (Figure 2). The time series of smoke occurrences available since the year 2005 shows the frequent occurrence of smoke plumes over the lake during summer months when the particulate matter load is maximized. The time series of smoke occurrences show a statistically significant increasing trend with anomalously high values of particulate matter loading occurring over the lake in recent years.
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