Figure (IMAGE) Science China Press Caption Spatial distributions of the secular trend variances in (a) January, (b) April, (c) July and (d) October. (e)–(h) as for (a)–(d), but for the ratio of the secular trend to the sum of the secular trend and multi-decadal variations. Credit @Science China Press Usage Restrictions Use with credits License Original 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.