Fig. 2: The first spatial mode of the EOF analysis of LSWV variations.
From: Analysis of factors influencing tropical lower stratospheric water vapor during 1980–2017
The first spatial mode of the EOF analysis of LSWV variations is EOF_WV1 and the temporal mode is PC_WV1. LSWV variations are at 85 hPa for the period 1980–2017 using MERRA-2 data covering 30°S–30°N. LSWV variations were obtained by removing the annual cycle and linear trend from the original time series at each grid cell. The square-root of the cosine of latitude was used for the weighting function in the EOF analysis. a EOF_WV1. The value in the upper right corner is the explained variance of the mode. b PC_WV1 (black line) and the time series of water vapor anomalies averaged at 85 hPa in the tropics (30°S–30°N; WV; red line). c PC_WV1 (black line) and the time series of CPT anomalies averaged in the tropics (30°S–30°N; CPT; red line). The values in the upper right corner in b and c are the correlation coefficients.
