air parcel

What is the concept of an air parcel? ? In many fluid mechanics problems, mixing is viewed as a aresult of the random motions of individual molecules. In the atmosphere, molecular mixing is important only within a centimeter of the Earth's surface and at levels above the turbopause (~105km). At intermediate levels, virtually all mixing n the vertical is accomplished by the xchange of macroscale "air parcels" with horizontal dimensions ranging from millimiters to the scale of the Earth itself.

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