On average mass loading

In April 2015 recomputed the regression model for MERRA surface pressure. In particular, I computed the model over 2013.0, 2015.0 period. The model includes the average pressure field, secular drift and amplitudes of a number of harmonics. Here is the average Up pressure loading over exactly the same time range as the the regression model, 2013.0, 2015.0. The average loading is very close to zero.

As a test I computed Up pressure loading for a place with lat=50° and lon=20° (Krakow, Poland). The average is close to zero.

However, if to compute the average loading over the period of time not equal to the period of time of the model, a noticeable deviation of the average from zero will be observed. Here are two examples: average up loading over 2013.0, 2014.0 and average up loading over 2014.0, 2015.0. In both cases the regression mode of the surface pressure was computed for the period 2013.0, 2015.0

Movie of the pressure anomaly wrt the regression model with the land-sea mask applied.

Movie of the up pressure loading over 2013.0-2015.0.

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Last update: 2015.04.26_09:38:01 Web page was prepared by Leonid Petrov ()