NVAP – Next Generation (NVAP-NG) will incorporate additional sensors not available in previous versions of NVAP. These include operational ATOVS soundings and microwave-only retrievals from AMSU and SSM/T-2. Heritage retrievals such as SSM/I precipitable water, HIRS moisture profiles, and TOVS Pathfinder soundings will be included. The retrieval results will be blended to produce a global, 50 km resolution, twice daily water vapor product for July 1999 – June 2001. Total precipitable water vapor will be produced as well as 5 layer values (1000 – 850, 850 – 700, 700 – 500, 500 – 300, < 300 mb).
In order to explore the temporal consistency of NVAP-NG, 1999 has been chosen as a “bridge” year. We will produce NVAP using the heritage approach and compare it to the NVAP-NG product. This will serve as a first look at systematic or regional differences between the two data sets which could affect future users. Future objectives to overlap NVAP with Aqua instruments (AIRS, AMSR) in the year 2002 will be discussed.