Accession Number : ADA320370

Title :   Temperature Data Continuity with the Automated Surface Observing System.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s) : Schrumpf, Alison D.

PDF Url : ADA320370

Report Date : 09 JAN 1997

Pagination or Media Count : 256

Abstract : The National Weather Service has been installing Automated Surface Observing Systems (ASOS) at all first-order weather stations since 1991 as a part of their modernization program. The introduction of this new, automated method of observing the atmosphere has brought with it inherent differences in measuring surface meteorological conditions. One such affected variable is surface air temperature. When ASOS temperature readings at various weather stations were compared to simultaneous temperature readings reported by the Model HO83 instrument, which is used in conventional, man-made observations at those stations, discrepancies were often noted. These discrepancies lead to inevitable inhomogeneity in the temperature time series at stations where ASOS is installed. This investigation examines the sources contributing to these temperature differences for each of the 76 stations in this study. Examination of temperature differences between conventional observations (using the Model HO83 and designated as CONV for this study) and pre-commissioned ASOS observations have shown conventional observations are warmer (for a large majority of stations) than the corresponding ASOS temperature measurements. Comparing all synoptic hours for all seasons, the average ASOS - CONV temperature differences ranged from -2.56 deg F (ATL) to +0.61 deg F (ORH), with a mean value of -0.79 deg F.

Descriptors :   *ATMOSPHERIC TEMPERATURE, *TIME SERIES ANALYSIS, *WEATHER STATIONS, AUTOMATION, COMPARISON, THESES, SEASONAL VARIATIONS, MANMADE, DIURNAL VARIATIONS.

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE