GHCN contains reports from several sources, so there often are multiple records for the same location. Occasionally, a single record was divided up by NOAA into several pieces, e.g. if suspicious discontinuities were discovered. USHCN and SCAR contain single source reports but in different formats/units and with different or no identification numbers. For USHCN, the table "ushcn2.tbl" gives a translation key, for SCAR we extended the WMO number if it existed or created a new ID if it did not (2 cases). SCAR stations are treated as new sources. Adding SCAR data to GHCN: The tables were reformatted and the data rescaled to fit the GHCN format; the new stations were added to the inventory file. The site temperature.html has not been updated for several years; we found and corrected a few typos in that file. (Any SCAR data marked "preliminary" are skipped) Replacing USHCN-unmodified by USHCN-corrected data: The reports were converted from F to C and reformatted; data marked as being filled in using interpolation methods were removed. USHCN-IDs were replaced by the corresponding GHCN-ID. The latest common 10 years for each station were used to compare corrected and uncorrected data. The offset so obtained was subtracted from the corrected USHCN reports to match any new incoming GHCN reports for that station (GHCN reports are updated monthly; in the past, USHCN data used to lag by 1-5 years). Filling in missing data for Hohenpeissenberg: This is a version of a GHCN report with missing data filled in, so it is used to fill the gaps of the corresponding GHCN series. Result: v2.mean_comb Step 1 : Simplifications, elimination of dubious records, 2 adjustments (do_comb_step1.sh) ----------------------------------------------------------------------- The various sources at a single location are combined into one record, if possible, using a version of the reference station method. The adjustments are determined in this case using series of estimated annual means. Non-overlapping records are viewed as a single record, unless this would result introducing a discontinuity; in the documented case of St.Helena the discontinuity is eliminated by adding 1C to the early part. After noticing an unusual warming trend in Hawaii, closer investigation showed its origin to be in the Lihue record; it had a discontinuity around 1950 not present in any neighboring station. Based on those data, we added 0.8C to the part before the discontinuity. Some unphysical looking segments were eliminated after manual inspection of unusual looking annual mean graphs and comparing them to the corresponding graphs of all neighboring stations. See CLEANING NOTES for further details. Result: Ts.txt Step 2 : Splitting into zonal sections and homogenization