Optical Turbulence Characteristics in the Upper Troposphere–Lower Stratosphere over the Lhasa within the Asian Summer Monsoon Anticyclone

The high elevation, complex topography, and unique atmospheric circulations of the Tibetan Plateau (TP) make its optical turbulence characteristics different from those in low-elevation regions. In this study, refractive index structure constant (Cn2) profiles Lhasa area at strength states Asian summer monsoon anticyclone (ASMA) are analyzed based on precious situ sounding data measured over August 2018. Cn2 upper troposphere–lower stratosphere fluctuates significantly within a few days during ASMA, particularly troposphere. effect ASMA varies among troposphere, tropopause, lower stratosphere. stronger closer is to Lhasa, more pronounced “upper highs lows” pressure field structure, which beneficial for decreasing potential temperature lapse rate. decrease static stability an important condition developing turbulence, elevating tropopause height, reducing temperature. However, if strong high-pressure activity occurs layer, such as 500 hPa, highs” forms increasing rate suppressing convective intensity. Being almost unaffected by low-level activities, main influencing factor, mainly inhibits variations intensity UTLS caused activities also have great influence astronomical parameters, will certain guiding significance site testing observations.