August 3, 2007

Smoke and Low Level Jet

Since early Wednesday the air mass advecting over ELF, based on backtrajectories from NOAA's Hysplit , came from Idaho and Montana. Smoke from fires of these states has been covered in the past few days by Kamonayi, Jill, and Ana. Dark red counts around 2km throughout the timeseries (left panel) are representatitive of clouds. At 15:00 UTC for both days the boundary rose to 2.5 and 2 km, on Aug.2 and Aug. 3, respectively. Smoke was observed between 5.5 to 8 km (aqua-light green counts). Atmospheric conditions favored the formation of a nocturnal low level jet. Its presence was confirmed by Maryland Department of the Enviroment wind profiler, located in Beltsville, MD. At Beltsville the MDE wind profiler remotely detected the low level jet at a height of 0.2 - 1.1 km for a period of 11 hours. ELF detected a residual aerosol layer expericing enhanced turbulent homogenities and stratification at the same heights and for the same period of time (right panel). Colorbar scale was changed on left plot to make noticeable the presence of the low level jet.

Wind profile provided by Matthew Seybold from Maryland's Department of the Environment.

Posted by Ruben Delgado at August 3, 2007 11:52 PM