SCIENCE GOALS AND OBJECTIVES: WE PROPOSE TO CREATE A DATASET OF THE (CORRECTED) MERIDIONAL FLOW IN SUB-PHOTOSPHERIC LAYERS (DERIVED MAINLY FROM SDO/HMI) FOR SCIENTIFIC INVESTIGATIONS BY THE HELIOPHYSICS COMMUNITY. THE MERIDIONAL FLOW PLAYS AN IMPORTANT ROLE IN A BROAD RANGE OF SOLAR PHENOMENA FROM THE DYNAMO TO THE EVOLUTION OF POLAR MAGNETIC FIELDS AND THE PREDICTION OF THE SOLAR CYCLE. THE LATITUDINAL PROFILE OF THE MERIDIONAL FLOW IS A KEY INGREDIENT IN SURFACE FLUX-TRANSPORT MODELS AND GREATLY INFLUENCES THE POLAR FIELD EVOLUTION. THE MERIDIONAL FLOW IS THUS A CRUCIAL COMPONENT OF THE EVOLUTION OF SURFACE MAGNETIC FLUX. THE STRUCTURE AND THE STRENGTH OF THE MERIDIONAL FLOW SETS THE TIMING OF THE SOLAR CYCLE IN FLUX-TRANSPORT DYNAMO MODELS. THE MERIDIONAL FLOW AND ITS TEMPORAL VARIATION ARE THUS A CRUCIAL PART IN PREDICTING THE SOLAR CYCLE. WITH ITS COMPARABLY SMALL AMPLITUDE (ABOUT TWO ORDERS OF MAGNITUDE SMALLER THAN THE SOLAR ROTATION RATE) THE MERIDIONAL FLOW IS SUSCEPTIBLE TO SYSTEMATICS AND ROBUST MEASUREMENTS ARE NOT EASILY AVAILABLE. WE PROPOSE TO CREATE A DATA PRODUCT THAT IS CORRECTED FOR SYSTEMATICS AND IS CONSISTENT DURING DIFFERENT PHASES OF THE SOLAR CYCLE. THE PROPOSED DATA PRODUCT CAN THUS BE USED AS INPUT DATA IN MODELING EFFORTS OR AS A BENCHMARK TO COMPARE MODEL PREDICTIONS AGAINST. MAKING THE CORRECTED SUBSURFACE MERIDIONAL FLOW AVAILABLE AS A DATA RESOURCE TO THE HELIOPHYSICS COMMUNITY WILL GREATLY ENHANCE THE SCIENTIFIC RETURN FROM SDO/HMI AND WILL BE CRUCIAL FOR UNDERSTANDING THE POLEWARD TRANSPORT OF MAGNETIC ACTIVITY AND PREDICTING THE SOLAR CYCLE. METHODOLOGY: WE WILL PRODUCE THE FOLLOWING DATA PRODUCT: THE MERIDIONAL FLOW AT SEVERAL DEPTHS IN THE SUBSURFACE LAYERS AS A FUNCTION OF LATITUDE AND TIME. THE INPUT MEASUREMENTS ARE THE SUBSURFACE FLOWS DERIVED FROM SDO/HMI DOPPLERGRAMS ANALYZED WITH THE RING-DIAGRAM TECHNIQUE FROM THE SURFACE TO A DEPTH OF 16 MM. FROM THE DAILY FULL-DISK FLOW MAPS (INPUT DATA) WE WILL CALCULATE THE AVERAGE MERIDIONAL FLOW (PROPOSED DATA PRODUCT) AVERAGED OVER EACH COMPLETE CARRINGTON ROTATION. WE WILL REMOVE SYSTEMATIC EFFECTS PRESENT IN THE SUBSURFACE FLOW MEASUREMENTS SUCH AS SYSTEMATIC VARIATIONS WITH DISK POSITION AND ANNUAL VARIATIONS DUE TO THE B0 AND P ANGLE AND AVERAGE THE CORRECTED FLOWS OVER EACH CARRINGTON ROTATION. THEN WE WILL USE SOHO/MDI AND GONG DATA TO GENERATE THE CORRECTED MERIDIONAL FLOW FOR SOLAR CYCLE 23 IN ADDITION TO CYCLE 24 COVERED BY SDO/HMI DATA. WE HAVE ALREADY TESTED OUR METHOD ON EXISTING (ARCHIVED) SUBSURFACE FLOW DATA AND PLAN TO CREATE THESE DATASETS FIRST INCLUDING THEIR CALIBRATION AND DOCUMENTATION. WE WILL THEN CREATE NEW DATA PRODUCTS AS SOON AS A FULL CARRINGTON ROTATIONS OF SUBSURFACE FLOW MEASUREMENTS BECOME AVAILABLE FROM SDO/HMI (VIA JSOC) AND WILL ADD THEM TO THE DATA SET. IN THIS WAY WE WILL CREATE A DATASET THAT CAN BE USED FOR STUDIES OF THE SOLAR CYCLE AS WELL AS FOR MODELING LATITUDINAL FLUX TRANSPORT OF THE CURRENT SUN.