Assimilation of Passive Microwave Radiances Into U.S. Navy Operational NWP Models

Status of GSI adjoint development

· Tangent linear version of GSI (autumn release) has been developed and tested extensively for a range of perturbation types...major step toward generation of adjoint.

· Adjoint testing planned for early summer

· Tangent linear system is well behaved (representative of GSI) overall:

- good to excellent results for perturbed observations of u, v, T, q, radiance

- results improve, especially for q, when penalties for negative moisture/super saturation are removed or reduced

- response to ozone perturbations poor (highly nonlinear), but significance is unclear

· Update to March release of GSI underway:

- variational QC

- begin consolidation of nonlinear and tangent codes


	Error is vertically integrated, includes T, vor, div, ps.

	Show map example of error pattern – synoptic-scale features (see Slide #19)

	Error measure Includes vorticity, divergence, temperature, pressure

	e24-e30 is not the same as x24 – x30