Autumn, Equinox and resharing

Happy Autumn Equinox! With all this lovely weather we have been having it was easy to forget it. I thought it was apt that the weather became more chilly today as it is the official Autumn Equinox, marking, for many, the start of Autumn.

I have written before of how we Irish like to define the seasons in our own bizarre ways. The same post also describes what an equinox is, if you want the nitty, gritty detail. Personally, I judge the seasons more by the cues in Nature and I certainly have noticed the birds starting to gather for their migration, the days beginning to shorten and the leaves on the trees beginning to change colour. I always thing the colour display of Autumn is worth the colder nights and darker days.

Did you ever wonder why and how the leaves change colour? Well it turns out I wrote about that too, in my first ever blog post. Today I get to share it with you again while joining in a blog linky by lovely fellow Galway blogger, Aedin, over at Minis and Mum, as she invites people to share their first ever post in celebration of her lovely blog’s three year anniversary.

So here is a repost of mine…



It’s funny how Autumn comes around every year and I realise how much I love this time of year…. it’s as though I seem to forget I like it all throughout the other seasons.  Of course we have had a particularly nice Autumn this year in the West of Ireland and maybe that has re-enforced my happy memories of the season.  The days have been bright and crisp showing off all the beautiful colours in all their glory and splendour.

photo credit: Stellas mom via photopin cc
photo credit: Stellas mom via photopin cc

I grew up in Co. Wicklow surrounded by some beautiful deciduous woods and forests and this Autumn has really brought my childhood memories flooding back.  My mother brought us often to the woods as children and we would hunt around for hidden treasures and delights to bring home and turn into some “masterful” collage in homage to the season.  There was also the foraging, a distinctive primordial instinct in us all, there is nothing as pleasing as returning home with your bounty… be it blackberries or sweet horse chestnuts- to be turned into jams and tarts or painstakingly peeled off all nasty layers to reveal  the divinely sweet, fruity, nutty delight beneath.  In fact the joy that came with eating the nut always made it suddenly worth your while to start the arduous task of peeling all over again!

…and I hope that I will never outgrow the delight of running, kicking, shuffling through a crisp new crop of fallen leaves!

As many people know, the lovely green of most leaves is caused by the pigment chlorophyll… green in colour (obviously) and capable of using sunlight to convert water and carbon dioxide into energy (sugar) for the plant.  However, when the sunlight hours fade coming into winter so too does the chlorophyll in the leaves of trees, or, to be more precise, the pigment begins to degrade and is not replaced.  Once the green colour is gone other pigments that are often present in the leaf come into view… carotenoids are pigments responsible for the yellow/orange colour of leaves, anthocyanins are responsible for the redder colour of leaves and tannins are responsible for the brown colour of leaves.  There is, within this pigmented system, a sense of hierarchy, at least in part.  But did you ever wonder about the science behind those wonderful colours?  I did… why the green suddenly disappears, where does it go and how do the other colours get there in its place? So, if like me, you ever wondered about these things… here is some insight into the why and what of Autumn!


photo credit: looseends via photopin cc
photo credit: looseends via photopin cc

Carotenoids are the pigments responsible for the orange colour of carrots. If carotenoids are present their colour tends to dominate leaving the leaves yellowy and orange.

In the absence of carotenoid, anthocyanin is the dominant pigment. Anthocyanin (the same pigment found in red onions, red grapes, red apples and red cabbage) is a natural pH indicator, meaning that it can change colour depending on the levels of acids or bases/alkali in its environment.  In fact one of my favourite experiments that I often do with children is to demonstrate this colour changing using anthocyanin extracted from red cabbage (but that’s a whole other blog in itself).  At the beginning of Autumn the levels of sugar in the leaves tends to be quite high, increasing the acid levels in the leaves, this strengthens the red colour of Anthocyanin if it is present in the leaves.

At the end of Autumn the leaves die off and the levels of carotenoids and anthocynins die off too, leaving another pigment to dominate… and this is the brown pigment of tannin, the same pigment that give a cup of tea it’s colour!

So there you have it… next time you are crunching through those leaves you may wonder why you are suddenly thinking of carrots and cabbages and cups of tea!!!


There are lots of lovely “first steps” posts to read in this linky, just click on the image below to find some more.

Minis and Mon - First Steps Liny
Minis and Mum – First Steps Linky



Science blogger and writer; Owner of Dr. How's Science Wows; Mother of three junior scientists who have taught me that to be a great scientist you need to look at life through the eyes of a child!

10 thoughts on “Autumn, Equinox and resharing

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  • September 28, 2014 at 9:53 pm

    Great first post!I love this time of year too!It was great to find out why leaves change colour-thanks for that and for linking up!x

  • September 24, 2014 at 1:16 pm

    This is brilliant – my junior infant has homework all about Autumn – we have to discuss the changes and he needs to report back so this a very timely reposting!

    • September 25, 2014 at 1:03 pm

      Thanks Jill, glad it is of some help 🙂

    • September 25, 2014 at 2:26 pm

      I got treated to my first ever song about Autumn from Montessori last night before bedtime. It was adorable! He whispered it the first time but then when he got a round of applause he sang it again with gusto. Love this time of the year. Lovely first post Naomi!

      • September 25, 2014 at 3:16 pm

        Thanks, and how lovely to get your own private concert 🙂

  • September 24, 2014 at 10:20 am

    Lovely first post! Now I have to print it off and hand it to the kids to answer all their questions 🙂

    • September 24, 2014 at 10:58 am

      I think I might do the same here now that you mention it 🙂

    • September 24, 2014 at 9:22 am

      Thanks 🙂

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