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Title: Monte Carlo Study of UAV-Measurable Albedo over Arctic Sea Ice

Abstract

In anticipation that unmanned aerial vehicles (UAVs) will have a useful role in atmospheric energy budget studies over sea ice, a Monte Carlo model is used in this study to investigate three-dimensional radiative transfer over a highly inhomogeneous surface albedo involving open water, sea ice, and melt ponds. The model simulates the spatial variability in 550-nm downwelling irradiance and albedo that a UAV would measure above this surface and underneath an optically thick, horizontally homogeneous cloud. At flight altitudes higher than 100 m above the surface, an airborne radiometer will sample irradiances that are greatly smoothed horizontally as a result of photon multiple reflection. If one is interested in sampling the local energy budget contrasts between specific surface types, then the UAV must fly at a low altitude, typically within 20 m of the surface. Spatial upwelling irradiance variability in larger open water features, on the order of 1000 m wide, will remain apparent as high as 500 m above the surface. To fully investigate the impact of surface feature variability on the energy budget of the lower troposphere ice–ocean system, a UAV needs to fly at a variety of altitudes to determine how individual features contribute to the area-averagemore » albedo.« less

Authors:
 [1];  [2];  [3]
  1. Arctic Research and Consulting, San Diego, California
  2. Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California
  3. Dartmouth University, Hanover, New Hampshire
Publication Date:
Research Org.:
Univ. of California, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1417525
Alternate Identifier(s):
OSTI ID: 1541861
Grant/Contract Number:  
SC0008502
Resource Type:
Published Article
Journal Name:
Journal of Atmospheric and Oceanic Technology
Additional Journal Information:
Journal Name: Journal of Atmospheric and Oceanic Technology Journal Volume: 35 Journal Issue: 1; Journal ID: ISSN 0739-0572
Publisher:
American Meteorological Society
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; engineering; meteorology & atmospheric sciences; atmosphere; sea ice; radiative fluxes; aircraft observations

Citation Formats

Podgorny, Igor, Lubin, Dan, and Perovich, Donald K. Monte Carlo Study of UAV-Measurable Albedo over Arctic Sea Ice. United States: N. p., 2018. Web. doi:10.1175/JTECH-D-17-0066.1.
Podgorny, Igor, Lubin, Dan, & Perovich, Donald K. Monte Carlo Study of UAV-Measurable Albedo over Arctic Sea Ice. United States. doi:10.1175/JTECH-D-17-0066.1.
Podgorny, Igor, Lubin, Dan, and Perovich, Donald K. Mon . "Monte Carlo Study of UAV-Measurable Albedo over Arctic Sea Ice". United States. doi:10.1175/JTECH-D-17-0066.1.
@article{osti_1417525,
title = {Monte Carlo Study of UAV-Measurable Albedo over Arctic Sea Ice},
author = {Podgorny, Igor and Lubin, Dan and Perovich, Donald K.},
abstractNote = {In anticipation that unmanned aerial vehicles (UAVs) will have a useful role in atmospheric energy budget studies over sea ice, a Monte Carlo model is used in this study to investigate three-dimensional radiative transfer over a highly inhomogeneous surface albedo involving open water, sea ice, and melt ponds. The model simulates the spatial variability in 550-nm downwelling irradiance and albedo that a UAV would measure above this surface and underneath an optically thick, horizontally homogeneous cloud. At flight altitudes higher than 100 m above the surface, an airborne radiometer will sample irradiances that are greatly smoothed horizontally as a result of photon multiple reflection. If one is interested in sampling the local energy budget contrasts between specific surface types, then the UAV must fly at a low altitude, typically within 20 m of the surface. Spatial upwelling irradiance variability in larger open water features, on the order of 1000 m wide, will remain apparent as high as 500 m above the surface. To fully investigate the impact of surface feature variability on the energy budget of the lower troposphere ice–ocean system, a UAV needs to fly at a variety of altitudes to determine how individual features contribute to the area-average albedo.},
doi = {10.1175/JTECH-D-17-0066.1},
journal = {Journal of Atmospheric and Oceanic Technology},
number = 1,
volume = 35,
place = {United States},
year = {2018},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1175/JTECH-D-17-0066.1

Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

Figures / Tables:

FIG. 1 FIG. 1: (left) SHEBA mosaic (original) image 4653 × 5687 pixels with a pixel size of 2.0m, (top right) subset of the original image 500 × 500 pixels, and (bottom right) segmented subset of the original image. Red dots on the original image show locations of the subset image, andmore » red dots on the subset images show the area used for the simulations that follow. Open water areas are shown in blue, and melt ponds are depicted in turquoise.« less

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