This does indeed happen. For instance, evening winds in southern coastal CA will often blow out to sea ... perhaps in the SFBA it’s similar. But in this parti

This does indeed happen. For instance, evening winds in southern coastal CA will often blow out to sea ... perhaps in the SFBA it’s similar. But in this particular instance, it’s hard to be sure if that’s the explanation without knowing more. The data will only be observed once or twice per day, due to the MODIS orbit, and clouds and other problems will cause dropouts. These website data seem to be interpolated spatially and temporally using wind fields and perhaps other side information. So these areas of apparent high CO concentration could be due to the transport model or the prior as much as the actual observed CO data. The website doesn’t say what data product they are using. The MOPITT website advertises daily data, but the displayed data are faster than that.