Fig. 1. Comparison and correlation analysis between MODIS and AIRS satellite data. (a) Time series diagram; (b) correlation analysis chart

Fig. 2. CTP spatial distribution map of day and night (a), day (b), night (c) and altitude spatial distribution map (d) in East Asia from 2001 to 2021

Fig. 3. Seasonal variation of CTP over East Asia from 2000 to 2020

Fig. 4. Spatial distribution of CTP seasonal variations over East Asia from 2000 to 2020.(a) Spring; (b) summer; (c) autumn; (d) winter

Fig. 5. Results of CTP MK mutation testing in East Asia from 2001 to 2021. (a) Annual variation curve; (b) day and night MK; (c) day MK; (d) night MK

Fig. 6. Variation of CTP in East Asia from 2001 to 2021. (a) Month-on-month trend of East Asia; (b) month-on-month trend of Northeast China; (c) monthly trend of the Eastern Tibetan Plateau region; (d) monthly mean map of East Asia and its sub-regions ; (e) monthly zonal mean map of East Asia ; (f) interannual variation map of different latitudes in East Asia

Fig. 7. Zonal mean distribution of CTP over East Asia from 2001 to 2021

Fig. 8. Spatial distribution of CTP trends over East Asia from 2001 to 2021. (a) MK trend test variation chart; (b) annual rate of change

Fig. 9. EOF1 spatial distribution map (a) and time coefficient map (b) of CTP in East Asia from 2001 to 2021

Fig. 10. Spatial distribution map of the correlation coefficients between CTP and meteorological factors in East Asia from 2003 to 2021. (a) Surface temperature; (b) humidity; (c) atmospheric water vapor; (d) cloud cover

Table 1. Linear fitting and MK trend test for different time periods in East Asia from 2001 to 2021

Table 2. Variance contribution rate of the first six modes in EOF analysis of CTP over East Asia