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Title: Measuring cloud thermodynamic phase with shortwave infrared imaging spectroscopy

Shortwave Infrared imaging spectroscopy enables accurate remote mapping of cloud thermodynamic phase at high spatial resolution. We describe a measurement strategy to exploit signatures of liquid and ice absorption in cloud top apparent reflectance spectra from 1.4 to 1.8 μm. This signal is generally insensitive to confounding factors such as solar angles, view angles, and surface albedo. We first evaluate the approach in simulation and then apply it to airborne data acquired in the Calwater-2/ACAPEX campaign of Winter 2015. Here NASA’s “Classic” Airborne Visible Infrared Imaging Spectrometer (AVIRIS-C) remotely observed diverse cloud formations while the U.S. Department of Energy ARM Aerial Facility G-1 aircraft measured cloud integral and microphysical properties in situ. Finally, the coincident measurements demonstrate good separation of the thermodynamic phases for relatively homogeneous clouds.
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [1] ;  [4] ;  [4] ;  [5] ;  [6] ;  [4] ;  [4] ;  [7]
  1. Jet Propulsion Laboratory, California Institute of Technology, Pasadena California USA
  2. Jet Propulsion Laboratory, California Institute of Technology, Pasadena California USA; Desert Research Institute, Reno Nevada USA
  3. Naval Research Laboratory, Washington District of Columbia USA
  4. Pacific Northwest National Laboratory, Richland Washington USA
  5. Goddard Earth Science Technology and Research, Universities Space Research Association, Columbia Maryland USA; NASA Goddard Space Flight Center, Greenland Maryland USA
  6. NASA Goddard Space Flight Center, Greenland Maryland USA
  7. Desert Research Institute, Reno Nevada USA
Publication Date:
OSTI Identifier:
1328835
Report Number(s):
PNNL-SA--121275
Journal ID: ISSN 2169-897X; KP1704010
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Geophysical Research: Atmospheres; Journal Volume: 121; Journal Issue: 15
Publisher:
American Geophysical Union
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English