The service of the atmospheric angular momentum forecast

Abstract:

In 2015 we launched the service of the atmospheric angular momentum
(AAM) forecast. We use a suite of numerical weather models that are running
operationally by the NASA Global Modeling and Assimilation Office: MERRA,
GEOS-FP, and GEOS-FPIT. Snapshots of 3D field of the parameters that describes
the state of the atmosphere provided by the output of the models are used for
computation of several AAM time series with resolution of 3 hours. We compute
the AAM for the past using the assimilation flavor of the models and for up to
72 hours in the future using the forecast flavor of GEOS-FP model. The AAM
is updated 4 times a day within 1 hour of the numerical weather model update.
The time series of the AAM available on-line run since 1979 in the past and
24-48 hours in the future.