- Climate change.
- Four seasons (winter, spring, summer, and autumn).
Here in Nepal, the seasons are pre-monsoon (March, April, and May), monsoon (June, July, and August), post-monsoon (September, October, and November), and winter (December, January, and February).
An earlier spring and later autumn are two of the strongest signals of climate change in temperate and boreal climates. meaning that winter is getting shorter and summer longer. In the tropics and subtropics, where seasons are defined largely by rainfall, there have also been changes, but not consistently, and there isn't one global pattern.
Dear Malik,
it`s just an addition to Richard Corlett`s reply - phenological season may change as shwon by King et al (2018) for boreal zone: https://www.nature.com/articles/s41598-018-26321-8.
Best
Nils
It seems to me that the seasons are astronomical phenomena to do with the tilt of the earth on its axis. The first day of winter is 21 Dec., when the northern hemisphere is tilted furthest away from the sun and the sun at noon is over the Tropic of Capricorn (23.5° south). , first day of spring, 21 March, is when the sun is over the equator at noon, etc. As so defined, the seasons are fixed periods of time, 1/4 of the year each. What the question is really about is changes of the climatic phenomena - snowmelt, bud burst and so forth - that we generally associate with spring, that have been occurring earlier lately than they have in the past. That is certainly true, but the length of the seasons, just like the length of day and night, have not changed as a result of climate change.
Thank you for adding Rakesh Prasad Bhagat , known for each region of its climatic seasons that vary in the time it occupies, accept my greetings@@@
Thank you Nils Borchard I will read it and read it, and this research you mentioned is related to the definition of climatic seasons.
Best regards
Thanks Andrew V Z Brower The change in actual thermal and rain seasons has affected different ecosystems. What I mean is that the thermal seasons have changed because of climate change so that the actual summer has increased its days and the days of spring and autumn have been observed.
Best regards
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