analyses are not interchangeable and should be Comments on treated differently I. n this essay, a “measurement” “Reanalyses and is a direct traceable observation of some geophysical quantity; a “retrieval” is a combination of meas -ure Observations: What’s ments (e.g., radiances from a satellite) and prio- r in formation and is an indirect observation or derived the Difference?” measurement in the terminology of Parker; and an “analysis” is the result of a data assimilation (DA) —Ross N. Hoffman or other interpolative process that combines diverse NOAA/Atlantic Oceanographic and Meteorological Laboratory, observations and a background or prior, normally a and Cooperative Institute for Marine and Atmospheric Studies, short-range forecas A t. s used here, measurements University of Miami, Miami, Florida and retrievals are “observations,” and observations and analyses are “data.” Second, different scales and —Nikki Privé different quantities are observed or represented by Morgan State University, Baltimore, Maryland an in situ sensor (e.g., a temperature measured by a sensor on a radiosonde), a satellite sensor [e.g., a —Mark Bourassa retrieved Atmospheric Infrared Sounder (AIRS) The Florida State University, Tallahassee, Florida temperature], and an analysis [e.g., the temperature at a grid location in a European Centre for Medium- Range Weather Forecasts
Bulletin of the American Meteorological Society – American Meteorological Society
Published: Nov 1, 2017
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