Comparison of Electrochemical Concentration Cell Ozonesonde and Microwave Limb Sounder Satellite Remote Sensing Ozone Profiles for the Center of the South Asian High

Abstract

Abstract:To further verify the ozone profile reliability of satellite remote sensing for the ozone valley over the Tibetan Plateau in the core area of the South Asian high in summer, we validate the ozone products from the microwave limb sounder (MLS) onboard the Aura satellite over the Tibetan plateau using electrochemical concentration cell (ECC) ozonesonde data of 2016 for Ngari, Tibet. The MLS version four ozone profiles have lower standard deviation in the middle stratosphere (38-10 hPa), whereas the ozonesonde profiles have lower standard deviation in the upper troposphere and lower stratosphere region (200-83 hPa). There are statistically significant differences between these two datasets in most of the stratosphere (10-83 hPa). The mean value of MLS ozone is about 0.8-1.5 mPa greater than that of ECC ozone, which corresponds to a relative deviation of 59 ± 24% at 83 hPa, 24 ± 13% at 68 hPa, 20 ± 5% at 56 hPa, 14 ± 4% at 46 hPa and 38 hPa, and 9 ± 4% in the layers between 32 and 10 hPa. However, there is no statistically significant difference between the two datasets in the upper troposphere (100-200 hPa).

Dehydration and low ozone in the tropopause layer over the Asian monsoon caused by tropical cyclones: Lagrangian transport calculations using ERA-Interim and ERA5 reanalysis data

“…Precision on individual ozone profiles is within 5 % or better in the lower stratosphere and is approximately 15 %-25 % at 100 hPa, with poor behaviour at low latitudes in the upper troposphere. The mean deviation is lower than 20 % between the MLS and the ECC ozone values in the upper troposphere over the Tibetan Plateau (Shi et al, 2017).…”

Dehydration and low ozone in the tropopause layer over the Asian monsoon caused by tropical cyclones: Lagrangian transport calculations using ERA-Interim and ERA5 reanalysis data

“…Precision on individual ozone profiles is within 5% or better in the lower stratosphere, and is approximately 15%-25% at 100 hPa, while with poor behavior at low latitudes in the upper troposphere. The mean deviation is lower than 20% between the MLS and the ECC ozone values in the upper troposphere over the Tibetan Plateau (Shi et al, 2017).…”

The 10–20 d Low-Frequency Oscillation Characteristics of Summer Precipitation in Eastern China in the Decaying Year of CP ENSO

“…The selected region in Figure 2 is the region where the precipitation anomaly center was located, and the variation rate of precipitation in this region was large (figures not shown), indicating that the summer low-frequency precipitation may be active in the region. A total of 53 stations (Figure 2c) within the quadrilateral region were selected to represent the mid-latitude region of eastern China (28)(29)(30)(31)(32)(33)(34)(35).5° N, 108-118° E).…”

“…The circulation fields at different layers of the troposphere of the following summer of CP ENSO are shown in Figure 4. Previous studies [29][30][31] indicated that the South Asia High (SAH) and the Western Pacific Subtropical High (WPSH) are two crucial systems affecting atmospheric circulation in east Asia. On day −6 of CP El Niño (Figure 4a), the east ridge point of the SAH was located west of 110 • E, a westerly jet at 200 hPa was excited in the northern part of the study area, and the west ridge point of the Western Pacific Subtropical High (WPSH) was near 126 • E. The "two ridges and one trough" situation was quite stable at middle and high latitudes of 500 hPa.…”