universal power law of the gravity wave manifestation in the aim cips polar mesospheric cloud images
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ID: 136821
2018
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Abstract
We aim to extract a universal law that governs the gravity wave manifestation
in polar mesospheric clouds (PMCs). Gravity wave morphology and the
clarity level of display vary throughout the wave population manifested by
the PMC albedo data. Higher clarity refers to more distinct exhibition of the
features, which often correspond to larger variances and a better-organized
nature. A gravity wave tracking algorithm based on the continuous Morlet
wavelet transform is applied to the PMC albedo data at 83 km altitude taken by
the Aeronomy of Ice in the Mesosphere (AIM) Cloud Imaging and Particle Size (CIPS) instrument to obtain a large
ensemble of the gravity wave detections. The horizontal wavelengths in the
range of ∼ 20–60 km are the focus of the study. It shows that
the albedo (wave) power statistically increases as the background gets
brighter. We resample the wave detections to conform to a normal distribution
to examine the wave morphology and display clarity beyond the cloud
brightness impact. Sample cases are selected at the two tails and the peak of
the normal distribution to represent the full set of wave detections. For
these cases the albedo power spectra follow exponential decay toward smaller
scales. The high-albedo-power category has the most rapid decay (i.e.,
exponent = −3.2) and corresponds to the most distinct wave display. The wave
display becomes increasingly blurrier for the medium- and low-power
categories, which hold the monotonically decreasing spectral exponents of −2.9
and −2.5, respectively. The majority of waves are straight waves whose
clarity levels can collapse between the different brightness levels, but in
the brighter background the wave signatures seem to exhibit mildly
turbulent-like behavior.
| Reference Key |
rong2018atmosphericuniversal
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|---|---|
| Authors | ;P. Rong;J. Yue;J. Yue;J. M. Russell III;D. E. Siskind;C. E. Randall;C. E. Randall |
| Journal | Journal of agricultural and food chemistry |
| Year | 2018 |
| DOI |
10.5194/acp-18-883-2018
|
| URL | |
| Keywords |
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