TY - JOUR
T1 - Persistent Layers of Enhanced Gravity Wave Dissipation in the Upper Mesosphere Revealed From SABER Observations
AU - Liu, Xiao
AU - Xu, Jiyao
AU - Yue, Jia
AU - Kogure, Masaru
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (41831073, 41874182, 42174196), the Natural Science Foundation of Henan (212300410011), the Open Research Project of Large Research Infrastructures of CAS “Study on the interaction between low/mid‐latitude atmosphere and ionosphere based on the Chinese Meridian Project”, “the Informatization Plan of Chinese Academy of Sciences (CAS‐WX2021PY‐0101)”, and “the Project of Stable Support for Youth Team in Basic Research Field, CAS (YSBR‐018)”. This work was also supported in part by the Specialized Research Fund and the Open Research Program of the State Key Laboratory of Space Weather.
Publisher Copyright:
© 2022. American Geophysical Union. All Rights Reserved.
PY - 2022/3/16
Y1 - 2022/3/16
N2 - Dissipation of gravity waves (GWs) and resultant momentum flux deposition and eddy diffusion significantly influence the atmospheric structure and circulation. Using the temperature profiles measured by the SABER instrument (2002–2021), we derive the global GW action and its scale height (HAm). Comparing to the background scale height (H), we identify a persistent layer of enhanced GW dissipation (HAm/H > 2) in the upper mesosphere. The enhanced dissipation is primarily centered at 80–85 km with a vertical range of ∼8–20 km. At middle and high latitudes, the enhanced dissipation extends down to ∼60 km and is located above the eastward (westward) wind peak in winter (summer). At low latitudes, enhanced dissipation occurs around the wind reversals. The possible mechanisms of enhanced dissipation include wave refraction, wind filtering, and reduced static stability. The persistent layer of enhanced dissipation identified here provide observational evidence for GW dissipation constrains in models.
AB - Dissipation of gravity waves (GWs) and resultant momentum flux deposition and eddy diffusion significantly influence the atmospheric structure and circulation. Using the temperature profiles measured by the SABER instrument (2002–2021), we derive the global GW action and its scale height (HAm). Comparing to the background scale height (H), we identify a persistent layer of enhanced GW dissipation (HAm/H > 2) in the upper mesosphere. The enhanced dissipation is primarily centered at 80–85 km with a vertical range of ∼8–20 km. At middle and high latitudes, the enhanced dissipation extends down to ∼60 km and is located above the eastward (westward) wind peak in winter (summer). At low latitudes, enhanced dissipation occurs around the wind reversals. The possible mechanisms of enhanced dissipation include wave refraction, wind filtering, and reduced static stability. The persistent layer of enhanced dissipation identified here provide observational evidence for GW dissipation constrains in models.
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U2 - 10.1029/2021GL097038
DO - 10.1029/2021GL097038
M3 - Article
AN - SCOPUS:85126655130
SN - 0094-8276
VL - 49
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 5
M1 - e2021GL097038
ER -