A210-0006
Water Vapour Retrieval Development for a Portable Spectrometer in the Canadian High Arctic

Wednesday, 16 December 2020
Poster
Paul Sydney Jeffery1, Kaley A Walker1, Lin Dan1, James R Drummond2, Ellen Eckert1, Pierre Fogal1, Dejian Fu3, Debora Griffin4, Ashley Harrett1, Felicia Kolonjari5, Gloria L Manney6,7 and Kimberly Strong1, (1)University of Toronto, Department of Physics, Toronto, ON, Canada, (2)Dalhousie University, Department of Physics and Atmospheric Science, Halifax, NS, Canada, (3)Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States, (4)Environment and Climate Change Canada, Air Quality Research Division, Toronto, ON, Canada, (5)Environment and Climate Change Canada, Watershed Hydrology and Ecology Division, Victoria, BC, Canada, (6)NorthWest Research Associates, Inc, Socorro, NM, United States, (7)New Mexico Institute of Mining and Technology, Department of Physics, Socorro, NM, United States
Abstract:
The Arctic is warming at approximately twice the rate of the global mean through an effect known as Arctic amplification, wherein changes in the Arctic climate are magnified by a series of radiative feedback pathways. As a potent greenhouse gas water vapour plays a key role in many of these pathways, and so studying changes in Arctic water vapour can lead to a more thorough understanding of the changing Arctic climate. One instrument that has been used to study trace gases in the Arctic is the Portable Atmospheric Research Interferometric Spectrometer for the InfraRed (PARIS-IR; 750-4400 cm-1 spectra range; 0.02 cm-1 spectral resolution). From 2004 to 2017 PARIS-IR was operated at the Polar Environment Atmospheric Research Laboratory (PEARL; Ridge Lab., 80.05° N, 86.42° W) in Eureka, Nunavut as part of the annual Canadian Arctic ACE/OSIRIS Validation Campaigns. These six-week campaigns commence just after polar sunrise in late February, during which PARIS-IR recorded solar absorption spectra every seven minutes, weather permitting. Prior studies have used the PARIS-IR springtime measurement dataset to analyze a variety of trace gases (O3, HNO3, HCl, HF, CH4, C2H6, N2O, and CO). The focus of this study is on expanding this product list with a water vapour retrieval, the development of which is complicated by the strong vertical gradient and high variability of atmospheric water vapour. In this contribution, the development and implementation of the PARIS-IR water vapor retrieval will be presented, and comparisons will be made between these and coincident measurements made by other instruments including the CANDAC PEARL Bruker 125HR, in-situ radiosondes, and the Atmospheric Chemistry Experiment – Fourier Transform Spectrometer (ACE-FTS).
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