Meridional Energy Transport: Uncertainty in Zonal Means
نویسنده
چکیده
The meridional energy transport in the atmosphere and ocean is computed using atmospheric analyses from ECMWF and NMC, and net radiative ux from ERBE. An error analysis of the zonally-averaged total transport shows that errors of 7 Wm 2 in net ux produce transport errors of 0:5PW at the equator, an error of 9% in midlatitudes. Methods for correcting the mass non-conservation in transports derived from operational analyses are discussed. The ECMWF and NMC analysis systems now show remarkably similar zonally-averaged total energy transports, with normalized RMS di erences of only 11%, despite 23% di erences in Hadley-cell transports. The implied oceanic transport is derived along with an error estimate, and it is found to be broadly consistent with more direct measures of oceanic transport. The energy transport in NCAR's CCM1 and CCM2 is computed and is found to be about 20% larger than observations.
منابع مشابه
5. the Mean Meridional Circulation
(3) Here the square brackets denote zonal means, RΤ is the net radiation at the top of the atmosphere, and a time average has been used to eliminate the tendency term. Eq. (3) expresses the requirement of total energy balance for a “ring” of air along a latitude circle. By further integration of (3) with respect to latitude, we can obtain the meridional energy transport by the atmosphere, with ...
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