id summary reporter owner description type status priority milestone component version resolution keywords cc 242 Updated weak constraint 4DVAR impulse forcing arango arango Updated both weak constraint drivers '''W4DVAR''' and '''W4DPSAS''' conjugate gradient algorithm ('''congrad.F''') and allowed full weak constraint. Added new code to allow the time intepolation of the impulse forcing that is used in the outer loop by the representer model. We also corrected a couple of critical bugs in '''W4DVAR'''. Many thanks to Andy Moore for finding these bugs. upgrade closed major Adjoint Based Algorithms Adjoint 3.2 Done