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Title: Development of a high spectral resolution surface albedo product for the ARM Southern Great Plains Central Facility

Abstract

We present a method for identifying dominant surface type and estimating high spectral resolution surface albedo at the Atmospheric Radiation Measurement (ARM) facility at the Southern Great Plains (SGP) site in Oklahoma for use in radiative transfer calculations. Given a set of 6-channel narrowband visible and near-infrared irradiance measurements from upward and downward looking multi-filter radiometers (MFRs), four different surface types (snow-covered, green vegetation, partial vegetation, non-vegetated) can be identified. A normalized difference vegetation index (NDVI) is used to distinguish between vegetated and non-vegetated surfaces, and a scaled NDVI index is used to estimate the percentage of green vegetation in partially vegetated surfaces. Based on libraries of spectral albedo measurements, a piecewise continuous function is developed to estimate the high spectral resolution surface albedo for each surface type given the MFR albedo values as input. For partially vegetated surfaces, the albedo is estimated as a linear combination of the green vegetation and non-vegetated surface albedo values. The estimated albedo values are evaluated through comparison to high spectral resolution albedo measurements taken during several Intensive Observational Periods (IOPs) and through comparison of the integrated spectral albedo values to observed broadband albedo measurements. The estimated spectral albedo values agree well with observationsmore » for the visible wavelengths constrained by the MFR measurements, but have larger biases and variability at longer wavelengths. Additional MFR channels at 1100 nm and/or 1600 nm would help constrain the high resolution spectral albedo in the near infrared region.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1025663
Report Number(s):
PNNL-SA-79416
KP1704010; TRN: US201120%%674
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Atmospheric Measurement Techniques, 4(9):1713-1733
Additional Journal Information:
Journal Volume: 4; Journal Issue: 9
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ALBEDO; PLANTS; RADIANT FLUX DENSITY; RADIANT HEAT TRANSFER; RADIATIONS; RADIOMETERS; RESOLUTION; WAVELENGTHS

Citation Formats

McFarlane, Sally A, Gaustad, Krista L, Mlawer, Eli J, Long, Charles N, and Delamere, Jennifer. Development of a high spectral resolution surface albedo product for the ARM Southern Great Plains Central Facility. United States: N. p., 2011. Web. doi:10.5194/amt-4-1713-2011.
McFarlane, Sally A, Gaustad, Krista L, Mlawer, Eli J, Long, Charles N, & Delamere, Jennifer. Development of a high spectral resolution surface albedo product for the ARM Southern Great Plains Central Facility. United States. https://doi.org/10.5194/amt-4-1713-2011
McFarlane, Sally A, Gaustad, Krista L, Mlawer, Eli J, Long, Charles N, and Delamere, Jennifer. 2011. "Development of a high spectral resolution surface albedo product for the ARM Southern Great Plains Central Facility". United States. https://doi.org/10.5194/amt-4-1713-2011.
@article{osti_1025663,
title = {Development of a high spectral resolution surface albedo product for the ARM Southern Great Plains Central Facility},
author = {McFarlane, Sally A and Gaustad, Krista L and Mlawer, Eli J and Long, Charles N and Delamere, Jennifer},
abstractNote = {We present a method for identifying dominant surface type and estimating high spectral resolution surface albedo at the Atmospheric Radiation Measurement (ARM) facility at the Southern Great Plains (SGP) site in Oklahoma for use in radiative transfer calculations. Given a set of 6-channel narrowband visible and near-infrared irradiance measurements from upward and downward looking multi-filter radiometers (MFRs), four different surface types (snow-covered, green vegetation, partial vegetation, non-vegetated) can be identified. A normalized difference vegetation index (NDVI) is used to distinguish between vegetated and non-vegetated surfaces, and a scaled NDVI index is used to estimate the percentage of green vegetation in partially vegetated surfaces. Based on libraries of spectral albedo measurements, a piecewise continuous function is developed to estimate the high spectral resolution surface albedo for each surface type given the MFR albedo values as input. For partially vegetated surfaces, the albedo is estimated as a linear combination of the green vegetation and non-vegetated surface albedo values. The estimated albedo values are evaluated through comparison to high spectral resolution albedo measurements taken during several Intensive Observational Periods (IOPs) and through comparison of the integrated spectral albedo values to observed broadband albedo measurements. The estimated spectral albedo values agree well with observations for the visible wavelengths constrained by the MFR measurements, but have larger biases and variability at longer wavelengths. Additional MFR channels at 1100 nm and/or 1600 nm would help constrain the high resolution spectral albedo in the near infrared region.},
doi = {10.5194/amt-4-1713-2011},
url = {https://www.osti.gov/biblio/1025663}, journal = {Atmospheric Measurement Techniques, 4(9):1713-1733},
number = 9,
volume = 4,
place = {United States},
year = {Thu Sep 01 00:00:00 EDT 2011},
month = {Thu Sep 01 00:00:00 EDT 2011}
}