![]() ![]() We can see that during these episodes the tropical rainfall went up. The main thing that stands out for me in this record are the two biggest El Nino/La Nina episodes, one in 1997-1998, and one in 2009-2010. The p-value is adjusted for autocorrelation by using the Hurst exponent to calculate the effective degrees of freedom. Decomposition of the monthly rainfall record (red line, top panel) into two components-a repeating seasonal component (blue line, middle panel) and a residual component (bottom panel) which is the data minus the seasonal component. Figure 2 shows the month-by-month rainfall averages for the area 40°N to 40°S, decomposed into the seasonal and residual components.įigure 2. ![]() Now, when I look at a timeseries record, I want to be able to separate out the regular seasonal changes from the rest of the data. And when it rains, the rain comes down from the north. When the air rises, it draws in the moist air from off of the Indian Ocean, which pours down as the monsoon rain.īrazil, on the other hand, was a surprise in that I never knew that all of Brazil but the far north has a long dry period from July to January or so. It’s like the earth breathing-in the summer when India gets hot, the hot air rises. It is interesting to see the waves of precipitation wash over places like India. Where the winds meet there is intense rainfall, along with the deep thunderstorm convection that drives the global atmospheric circulation. As the name implies, the winds of both the northern and southern tropics converge near the equator. Note how the rainfall amounts clearly delineate the Inter-Tropical Convergence Zone (ITCZ) that runs along and generally just above the Equator. Note that this covers about two-thirds of the surface of the planet. The coverage of the mission only extends from 40°N to 40°S. Dr phil november 13 2015 movie#Movie loop of the monthly averages of the tropical rainfall, Dec 1997 – Mar 2015. To begin the temporal investigation, Figure 1 shows the month-by-month variations in the average rainfall.įigure 1. For this post, instead of averages over time I’ve looked at the changes in rainfall amounts over time. In that post, I looked at averages over the period of record. This regulation keeps the temperature within a very narrow range (e.g. This is another piece of evidence for my hypothesis that the global temperature is regulated by emergent phenomena, including tropical thunderstorms. There I showed that the cooling from thunderstorm-driven evaporation is a major heat-regulating mechanism in the tropics. I discussed my first look at this rainfall data in a post called Cooling and Warming, Clouds and Thunderstorms. I’ve been looking again into the satellite rainfall measurements from the Tropical Rainfall Measurement Mission (TRMM). ![]()
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