Authors: Ting Zhang*, , Chang Xiu Cheng, Beijing Normal University
Topics: Climatology and Meteorology, Global Change, Hazards, Risks, and Disasters
Keywords: Global Climate Change；Global temperature； Temperature change rate；Spatial heterogeneity
Session Type: Poster
Start / End Time: 8:00 AM / 9:40 AM
Room: Lincoln 2, Marriott, Exhibition Level
Presentation File: No File Uploaded
Global warming has been obvious in the last decades. However, the temperature change may display different trends and rates at different periods and different regions. Exploring the spatiotemporal heterogeneity of temperature change is very important for revealing the driving factors of temperature change in specific regions and periods.
The ERA interim temperature data is obtained to ascertain the temperature changes from 1979-2017. Mann-Kendall method is utilized to test the trend of global annual cumulative maximum temperature (ACMT). Results show that the global temperature is presented two stages in the past 39 years. In the first stage (1979-2003), the global ACMT showed a steady fluctuation; in the second stage (2004-2017), it showed a wavelike rise. ACMT change rates of these two stages are calculated for all regions in the world separately to analysis its spatial heterogeneity. In the first stage, the region with increasing ACMT is accounted for 45.43% of the total global area. Significant warming aggregated area is mainly distributed in the northern hemisphere mainland and the small area in Antarctica. Significant cooling aggregated area is mainly distributed in the southern hemisphere oceans and the Antarctica. In the second stage, the region with increasing ACMT is accounted for 62.40% of the total global area. Significant warming aggregated area is distributed in the Arctic Ocean. Significant cooling aggregated area is mainly in Antarctica. Though the warming region has expanded globally, it has reduced almost 9% of land warming region after climate transition. After transition, ocean warming region expanded more than 30%.