Retrievals of the Far Infrared surface emissivity over the Greenland Plateau using the Tropospheric Airborne Fourier Transform Spectrometer (TAFTS).

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Title: Retrievals of the Far Infrared surface emissivity over the Greenland Plateau using the Tropospheric Airborne Fourier Transform Spectrometer (TAFTS).
Authors: Bellisario, C
Brindley, H
Murray, J
Last, A
Pickering, J
Chawn Harlow, R
Fox, S
Fox, C
Newman, S
Smith, M
Anderson, D
Huang, X
Chen, X
Item Type: Journal Article
Abstract: The Tropospheric Airborne Fourier Transform Spectrometer (TAFTS) measured near surface upwelling and downwelling radiances within the far infrared (FIR) over Greenland during two flights in March 2015. Here we exploit observations from one of these flights to provide in-situ estimates of FIR surface emissivity, encompassing the range 80-535 cm-1. The flight campaign and instrumental set-up is described as well as the retrieval method, including the quality control performed on the observations. The combination of measurement and atmospheric profile uncertainties means that the retrieved surface emissivity has the smallest estimated error over the range 360-535 cm-1, (18.7-27.8 μm), lying between 0.89 and 1 with an associated error which is of the order ± 0.06. Between 80 and 360 cm-1, the increasing opacity of the atmosphere, coupled with the uncertainty in the atmospheric state, means that the associated errors are larger and the emissivity values cannot be said to be distinct from 1. These FIR surface emissivity values are, to the best of our knowledge, the first ever from aircraft-based measurements. We have compared them to a recently developed theoretical database designed to predict the infrared surface emissivity of frozen surfaces. When considering the FIR alone, we are able to match the retrievals within uncertainties. However, when we include contemporaneous retrievals from the mid infrared (MIR), no single theoretical representation is able to capture the FIR and MIR behaviour simultaneously. Our results point towards the need for model improvement and further testing, ideally including in-situ characterisation of the underlying surface conditions.
Issue Date: 22-Nov-2017
Date of Acceptance: 31-Oct-2017
ISSN: 0148-0227
Publisher: American Geophysical Union
Start Page: 12152
End Page: 12166
Journal / Book Title: Journal of Geophysical Research
Volume: 122
Issue: 22
Copyright Statement: ©2017. The Authors.This is an open access article under theterms of the Creative CommonsAttribution License, which permits use,distribution and reproduction in anymedium, provided the original work isproperly cited.
Sponsor/Funder: Natural Environment Research Council (NERC)
Natural Environment Research Council (NERC)
Funder's Grant Number: NE/K015133/1
Keywords: Science & Technology
Physical Sciences
Meteorology & Atmospheric Sciences
far infrared
Publication Status: Published
Appears in Collections:Space and Atmospheric Physics
Plasma Physics
Faculty of Natural Sciences

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