Figure 2 (IMAGE) Science China Press Caption First EOF mode of temperature in the PN section: (a) spatial mode, and (b) principle component. The grey line in (b) indicates the trend. Credit Copyright of Science China Press Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.