Average global temperature trends
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Global Average Temperature Trends Since the 19th Century
Multiple studies show that the global average surface temperature has increased significantly over the past century. Analyses of meteorological station data indicate a global warming of about 0.5°C to 0.7°C from 1880 to 1985, with similar warming in both hemispheres. The most recent decades have seen even sharper increases, with a cumulative rise of about 0.83°C from the 1980s to 2019, and an average rate of 0.32°C per decade during this period 1610.
Regional and Hemispheric Differences in Temperature Trends
The rate of warming is not uniform across the globe. High-latitude regions, especially the Arctic, have experienced the fastest warming, with some Arctic permafrost areas warming at more than 2°C per decade in the early 21st century. Europe and Russia have also seen significant increases, while regions like New Zealand and equatorial areas of South America, Southeast Asia, and Southern Africa have warmed more slowly, at rates below 0.15°C per decade 17. The Northern Hemisphere has generally warmed faster than the Southern Hemisphere, but both show clear upward trends 14.
Maximum, Minimum, and Diurnal Temperature Range (DTR) Trends
Research shows that minimum (nighttime) temperatures have increased more rapidly than maximum (daytime) temperatures, leading to a narrowing of the diurnal temperature range (DTR). From 1950 to 2004, minimum temperatures rose by about 0.20°C per decade, while maximum temperatures increased by about 0.14°C per decade. This trend was especially pronounced from 1950 to 1980, but since 1979, both minimum and maximum temperatures have increased at similar rates, muting recent DTR changes 38. These patterns are observed globally, with urban effects found to be negligible on the overall trends .
Tropospheric and Stratospheric Temperature Changes
Temperature increases are most pronounced at the surface and in the lower troposphere. For example, from 1958 to 1987, global surface and tropospheric temperatures increased by about 0.08°C to 0.09°C per decade. However, the lower stratosphere has shown a cooling trend, particularly in the south polar zone, likely linked to ozone depletion 25.
Statistical Evidence and Methodological Advances
Statistical analyses confirm that the observed warming is not due to random fluctuations but follows a clear, deterministic trend. Innovative methodologies, such as the innovative trend template (ITT), estimate global average temperature increases of about 0.75°C to 1.33°C over the past century, consistent with other approaches and IPCC estimates 910.
No Recent Global Warming Hiatus
Contrary to some claims, there has been no significant pause or hiatus in global warming from 1998 to 2019. More than 80% of the global land surface has shown significant warming, and 93% of countries surveyed have experienced a clear upward trend in mean annual temperature .
Conclusion
In summary, global average temperatures have risen steadily since the late 19th century, with the rate of warming accelerating in recent decades. The warming is widespread but varies by region, with the Arctic and high-latitude areas warming fastest. Both maximum and minimum temperatures are rising, with a notable narrowing of the diurnal temperature range. The evidence overwhelmingly supports a persistent and significant upward trend in global temperatures, with no recent hiatus in warming.
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