The Hemispherical Blackbody (HSBB) for improved traceability of longwave downward radiation
type: CreativeWork
description: In this work, the establishment of a new and metrologically solid traceability chain for the detection of atmospheric longwave downward radiation is presented. Key component of this traceability chain is a new reference cavity blackbody, the Hemispherical Blackbody of the Physikalisch-Technische Bundesanstalt. As a result, climate relevant atmospheric irradiance measurements are via the Hemispherical Blackbody strictly linked to the national standards of the Radiation Temperature Scale of the Physikalisch-Technische Bundesanstalt and consequently to the International System of Units. The new traceability chain serves as a much needed independent validation and metrological improvement of the already existing traceability of the reference for longwave downward radiation measurements. It will therefore pave the way for a consistent traceability of worldwide longwave downward radiation measurements independent of possible specific artefacts hold by a single institute. By this, the expanded uncertainties of longwave downward radiation measurements will then be significantly reduced from currently approximately 10 W/m2 to approximately 2 W/m2. More specifically, longwave downward radiation refers to the infrared radiation that is emitted in the atmosphere and incident on the surface of the Earth. It is directly related to the greenhouse effect of the Earth and therefore particularly interesting for climate related research in the context of climate change. Measurements of longwave downward radiation take place on weather stations and research institutes around the world in areas of different climate conditions. In order to ensure reliability and traceability of the worldwide measurement data, the detecting radiometers need to be calibrated regularly. In the past, a set of stable radiometers, the World Infrared Standard Group operated at the Physikalisch-Meteorologisches Observatorium Davos / World Radiation Center, provided the reference for global longwave downward radi…
abstract: In this work, the establishment of a new and metrologically solid traceability chain for the detection of atmospheric longwave downward radiation is presented. Key component of this traceability chain is a new reference cavity blackbody, the Hemispherical Blackbody of the Physikalisch-Technische Bundesanstalt. As a result, climate relevant atmospheric irradiance measurements are via the Hemispherical Blackbody strictly linked to the national standards of the Radiation Temperature Scale of the Physikalisch-Technische Bundesanstalt and consequently to the International System of Units. The new traceability chain serves as a much needed independent validation and metrological improvement of the already existing traceability of the reference for longwave downward radiation measurements. It will therefore pave the way for a consistent traceability of worldwide longwave downward radiation measurements independent of possible specific artefacts hold by a single institute. By this, the expanded uncertainties of longwave downward radiation measurements will then be significantly reduced from currently approximately 10 W/m2 to approximately 2 W/m2. More specifically, longwave downward radiation refers to the infrared radiation that is emitted in the atmosphere and incident on the surface of the Earth. It is directly related to the greenhouse effect of the Earth and therefore particularly interesting for climate related research in the context of climate change. Measurements of longwave downward radiation take place on weather stations and research institutes around the world in areas of different climate conditions. In order to ensure reliability and traceability of the worldwide measurement data, the detecting radiometers need to be calibrated regularly. In the past, a set of stable radiometers, the World Infrared Standard Group operated at the Physikalisch-Meteorologisches Observatorium Davos / World Radiation Center, provided the reference for global longwave downward radi…
author: Feierabend, Moritz Carl
language: en
license: https://creativecommons.org/licenses/by/4.0/
date published: 2024
date modified: 2026-07-27T21:28:47Z
provider: Technische Universität Berlin
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Technische Universität Berlin

PropertyValue
property ID: DOI
value: 10.14279/depositonce-20476