These compounds are masked by the chlorophyll. The spectacular yellow and orange hues we associate with autumn are actually present in the leaf all the time in the form of carotenoids. At the end of the growing season, rather than spend the energy to keep the leaves alive the tree simply lets them die and fall off, knowing that newer, stronger ones will grow in the spring. When the spring brings more sunlight and higher temperatures, new leaves filled with chlorophyll provide energy for the tree to flower, grow fruit and seeds, as well as woody growth as the tree increases in size. Although many plants simply die with the coming of winter, deciduous trees have evolved a strategy dropping their leaves and going into a dormant state until spring. One important phenomenon associated with the change in the color of fall foliage. The days actually begin getting shorter after the summer Solstice, the longest day of the year, and when you see the signs of autumn will depend upon how far North you are as well as your elevation above sea level. Many people say that the Equinox is the beginning of autumn, but when you begin to see the signs of fall will depend on upon conditions in your local region. The tilt away from the Sun as the Sun moves from Autumnal Equinox to the Winter Solstice is the reason for the shorter daylight hours and shorter days also mean that the Sun does not have as long to heat the Earth’s surface. At the Spring and Autumnal Equinox, the tilt is perpendicular to the Sun. At the Winter and Summer Solstice, the South pole (during the Northern winter) or the North Pole (during Northern Summer) is pointed directly at the Sun at a tilt of 23°. This occurs because the axes upon which the planet Earth spins is set at an angle relative to the path the planet travels around the Sun.
The drop in daily average temperature we notice in the autumn is a result of shortening daylight hours. While the killing frost signals the end of the gardening season, it also triggers a number of other seasonal biological changes.
Martin’s (November 11) brings out Indian summer,” the condition is better described as a period of warm weather which occurs after the first hard frost of the season. Although The Old Farmer’s Almanac has tried to tie Indian Summer to the calendar, saying “If All Saints’ (November 1) brings out winter, St. European immigrants named the phenomena for the North American Indians whose land they were settling, elsewhere it is known as “altweibersommer” (Old women’s summer), or “gypsy summer”. What Causes Fall?Īutumn is a time of transition between the warmth of summer and the cold of winter, which makes the concept of Indian Summer all the more precious.
#WEATHER PHENOMENA FULL#
This time of year while the whole game animal population is at its peak of health when hunters go into the woods, hoping to harvest a freezer full of meat for the lean months ahead. Most deer species go into the rut during this time of year when the healthiest males are best equipped to pass their genes to the next generation. For outdoor sportsmen, the wildlife who gave birth has had all winter to grow healthy on the abundant plant growth through the summer months and is now at its fattest and healthiest stage of the year. On the sporting front, all those summer evenings spent cheering for your favorite baseball club eventually climax in the Fall Classic of the World Series, and Football stretches from the sweaty, dehydrating workouts of training camp in the late summer, through the autumn weekends, and will have its dramatic wrap-up during the first cold of the early winter. Many of the great fall festivals, like Oktoberfest in its many forms and the American Traditional Thanksgiving Feast, are harvest celebrations. The crops have been tended since planting in the spring, irrigated and cultivated through the long, hot summer, and it is finally time to enjoy the fruits of those long months of labor. In agricultural communities, autumn is the season of harvest. Although by outward appearance, Nature seems to simply be preparing for the big sleep of winter, there is a lot going on during the autumn months. It is easy to understand why many people would list autumn weather as their favorite time of the year.
0 kommentar(er)
