| http://www.w3.org/ns/prov#value | - Some of this drag could result from topographically-generated gravity waves (particularly in the Northern Hemisphere extratropics in winter), but nonstationary gravity waves excited by mechanisms such as convection or jet stream excitation must also be very important (and likely dominant in the tropics, in the SH extratropics and in the summer season in the NH extratropics.
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