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The Tropopause Inversion Layer Interaction With the Inertial Gravity Wave Activities and Its Latitudinal Variability
Author(s) -
Zhang Yehui,
Zhang Shaodong,
Huang Chunming,
Huang Kaiming,
Gong Yun
Publication year - 2019
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
eISSN - 2169-8996
pISSN - 2169-897X
DOI - 10.1029/2019jd030309
Subject(s) - tropopause , atmospheric sciences , middle latitudes , gravity wave , arctic , latitude , climatology , latent heat , geology , radiosonde , inversion (geology) , environmental science , stratosphere , gravitational wave , meteorology , physics , astrophysics , geodesy , structural basin , geomorphology , oceanography
By using 90 radiosonde stations with high vertical resolution data during the period 1998–2011, the latitudinal variation of the tropopause inversion layer (TIL) in different seasons and the interactions with the inertial gravity wave (IGW) activities in the region covering the Northern Hemispheric latitudes from 5° to 75° are studied. For the midlatitudes, the TIL features show obviously seasonal variations. In the Arctic region, TIL is strong and thick. The averaged Arctic TIL intensity peaks in summer. The intense interaction between the TIL and IGW is found in the region of 5°N to 75°N. The TIL could inhibit the upward propagation of IGWs from ~2 km below the tropopause in a larger region (40–75°N). It is found that for the middle‐latitude regions, the enhanced wind shear layer just above the tropopause could lead to instability and finally result in IGW breaking and intensive turbulence, which then leads to strong wave energy dissipation and a downward heat flux. The IGW‐induced cooling around the tropopause, which resulted from the downward heat flux, then makes a colder and sharper tropopause and finally form the TIL. The IGW‐associated strong downward heat flux is also found around the Arctic tropopause. However, there is no corresponding wind shear enhancement above the tropopause. This indicates that this strong heat flux may result from some other processes and then form the strong TIL in the Arctic.