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Search Results for: cycle
Cycle Change: Arctic Sea Ice Edition
After my last post, a reader asked: What’s most noticeable about this is the massive change in variability since 2007. Could you do some analysis of that? Sure.
Posted in climate change, Global Warming
Sea Ice Seasonal Cycle
Several readers mentioned that the plot of sea ice anomaly in the Arctic shown in the last post has much greater fluctuation after about 2007. Anomaly values are the difference between a given time’s extent, and the average for that … Continue reading
Posted in climate change, Global Warming
Annual Cycle of CO2
The question arose, whether the size of the annual cycle in atmospheric CO2 concentration has been changing recently. We’ve previously shown that it increased several decades ago, but has it increased or decreased more recently than that?
Trend and Cycle Together
Many climate signals show both trend and cycle (usually an annual cycle) together. A typical example is the concentration of carbon dioxide (CO2) in the atmosphere. If you look at the data (say, from the Mauna Loa atmospheric obsevatory) both … Continue reading
Glacial Cycles, part 2
In the previous post (also this) we established that without doubt, astronomical cycles — in particular, changes of obliquity (earth’s axial tilt) and precession (the relationship between the seasons and closest approach to the sun) — are related to the … Continue reading
Glacial Cycles, part 1b
This is just a “quickie” to show the results of Fourier analysis of a stack of delta-oxygen-18 records from benthic (i.e., ocean floor) sediment cores, which is not orbitally tuned.
Posted in Global Warming
Glacial Cycles, part 1
There’s really no doubt that astronomical cycles have influenced the growth and decay of ice on planet earth for the last 5 million years or so. The subject came up recently, and there seems to be a lot of confusion … Continue reading
Milankovitch Cycles
James Hansen has a new paper (a draft for review), “Paleoclimate Implications for Human-Made Climate Change.” We’ll discuss it in a future post. There’s a so-called “review” by Martin Hertzberg at WUWT in which he claims that Hansen fails to … Continue reading
How Fast is the Sea Rising?
I’m not asking how fast it was rising. I looked at that in the last post, using three different reconstructions of sea level since 1900 based on tide gauge data. And my goal wasn’t really to estimate the rate of … Continue reading
Hurricane Ida: Climate Change makes a Monster Storm
Warm sea water is what powers hurricanes. Usually, sea surface temperature (SST) in the Gulf of Mexico needs to exceed 29°C to intensify a hurricane, and every fraction of a degree above 29°C increases the chance — dramatically — of … Continue reading
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