venerdì 12 settembre 2014

Climate and Society 1. Celebrating climate anomalies?

"The fog came again that night, not on little cat’s feet but in an improper silent sprawl.  I walked that night.  I had a headache and I walked for air, smelling the wet, misty smell of the spring that was slowly wiping away the reluctant snow, leaving lifeless patches of last year’s grass bare and uncovered, like the head of a sighing old grandmother."  "Strawberry sping", Stephen King

In this novel the murders of a serial killer seem to be linked to an anticipation of spring, the Strawberry Spring of the title, imagined by author in May, but clearly inspired by the so called Indian Summer: also known as Saint Martin's Summer or Saint Luke's Summer, in the northern emisphere it is a period of above-normal temperatures, dry and hazy, occurring in autumn, bettween late September and mid November. 

In ancient times too those recurrent climatic anomalies have been recognised and often connected to myths and legends. The most famous of them is that about Alcyone: daughter of Aeolus, when her husband Ceyx died in a shipwreck, threw herself on the sea. Gods transformed her in a bird, the Halcyon bird. This bird builds its nest in winter on the beach. To permit to do it safely, Aeolus restrains his winds during seven days in each year, the so called Halcyon Days. 



This eziologic myth refers both to the behavior of the bird and the occurrence of these days. In fact a recurrent climatic inversion between Jenuary and Frebruary has been observed in the Mediterranean area in recent times too and, especially, in the region of Athens, Attica. A recently published paper, analysing ancient tragic and comic texts, remarks the link between the Halcyon Days and the Leneia celebrations. In February the mild climate conditions permitted to play comedies and tragedies in open air theaters, despite being in winter. The Lenaia were and important celebration in Athens, with strong cultural and political significance; and immediately after there were place the Anthesteria, the commemoration of the dead. 
February was an important month in Rome too. During this month were two public celebrations: Parentalia, the commemoration of the dead (as in Athens), and the Lupercalia, about the myth of the foundation of Rome. 
It is quite imposiible not to suppose, for this case also, a link with this sort of respite of winter that permitted to make activities and worship otherwise impossible during winter. 



Christian religion inherited those celebrations adapting them to the new cult needs. In particular the commemoration of dead was placed by the Roman liturgy, until XIV century, between January and February, as just now in some conservative oriental cult communities, as the southern Italian Grecìa
But in 998 AD Saint Odilone of Cluny established that the commemoration of the dead in November 2nd, following the tradition of Samhain, the Celtic new year eve. 

The Cluny's tradition has been officialy adopted by the Roman Church only in XIV century; but, why?

Thought that this short post doesn't want to be exhaustive about this topic, we can try to make some hypothesis:

1.  A political reason: the strenght of Cluny's order imfluenced the Roman litirgy; but, why did it take about four centuries? Was it about the Avignon's captivity?

2.   A cultural reason: the tradition of continental Europe has been adopted, despite the Mediterranean one; but you have to exlplain the span of time in this case too!

3.    A climate reason: the XIV century AD is the end of Medieval Warm Period and at the beginning of the Little Ice Age: a such important commemoration has been displaced because the worsening of climate conditions avoiding the regular worship of tombs and cemeteries during the winter, especially in central and northern Europe. The decision to adopt the Cluny's tradition would been purely utilitaristic? 



Obviously there is need for further research to determine what was the cause of such a decision that marked a clear distance between the ancient tradition of Mediterranean and continental Europe.
But this case study shows how the connections between culture and climate are varied and often not easily traceable; it is also evident that the study of these connections requires a deepening and a documentation very wide, in order to dispel the fog that envelops those links.  


  

venerdì 5 settembre 2014

Measures matter...

This morning when I woke up, I instintively checked the meteo forecast on my mobile phone. Having regular and accurate news about the weather is, for us now, as normal as we, probably underestimate the importance of measuring temperature, pressure, and so on.


In fact, after a lot of attempts, only in 1641 a sealed thermometer was constructed by the Grand Duke of Tuscany, Ferdinand II. The Duke stated also the regular measurement of temperature. During the following two centuries, as the instruments were more accurate and were able to record other parameters, such pressure and humidity, measurement of climate parameters became widly diffused all over the world. But for regular and official measurement it takes to wait the XIX century, when have been also the first attempts to predict weather (for military and commercial purposes, mainly). 

Weather is not climate...

...but climate derives from combining weather's conditions in a given time and space. So measuring climatic parameters and recording type and intensity of precipitations is foundamental to describe the climate; those observations have, also, to be taken for an enough long time frame, to appreciate the changes of climate patterns. In fact changes happen not suddenly, normally, and you've got to analyse a great amount of data to establish correlations and appreciate the evolutionary trends. 
It's clear that, almost, complete informations are available only for the last two centuries, and so what about for all the time humans lived without thermometers, barometers...and mobile phone apps?

A hole in the ice

The earth is naturally able to record changes occurred during its history. The geological deposits are, for example, important archives of the evolution of lithosphere during the millenia. More difficult is the analysis of changes occurred in the atmosphere, but not impossible. In fact, another type of deposit helps scholars to determine the global climate of the past: ICE. 


Icecores drilled mainly in Antartica, record climate for a time frame of millennia: ice, in fact, during the solidification, freeze in it all the components of the atmosphere in the same time of its formation. In this way, each icecore shows a succession of layers, different in thickness and chemical composition. Each layer corresponds to a climate stage, with peculiar characteristics of temperature and balance of gases in the air. 

From global to local

Antartica is a giant and almost complete archive of the climate of the past; but it's a GLOBAL archive. 
We learned at school that climate is linked to latitude, altitude and proximity to the sea. And so every point on the surface of the planet has a peculiar local climate. If you want to study the relationship between the history of local communities, environment and climate, you can't only take in account the global climatological data. 
Moving from a GLOBAL TO A LOCAL SCALE is not so easy, as it's not easy modelling the climate for a given region and for times instrumental measures are not available. At local scale several parameters and archives can be take in account: lake sediments, pollen analysis are able to provide important information about the environment in the past and, in consequence, about the local climate; but, considering the human impact in the landscape, they also record the anthropic modification of the landscape itself. Related to the presence of human communities are the alluvial deposits, dated by archaeological remains and witnessing the effects of climate patterns, but also the use of the soil of the communities themselves. 



Giving a light in this almost deep dark scenario scholars can take in account the written sources, various in types and information provided. They are NOT QUANTITATIVE sources, but are important to relate natural phenomena and their effects in the landscape. 

That's it: modelling the local climate of the past is not so easy as you can imagine. I'll need a lot of information, but also I'll must to record and relate data very different in type and origin. 
And the scheme became more and more complex.


             

   

    

mercoledì 3 settembre 2014

Clmate Change is a Human(ities) affair!

Climate change is a reality: in spite of sceptics, a very little amount really, the effects are in front of everyone's eyes. The causes of the change are also well known, as the implications for our everyday life: violent and sudden precipitations, floods are all events considered to be related to climate change.

Media and governments repeat that we must reduce carbon emissions, even that IPCC reports draw a future of disasters and decline for humankind. Sure, I can buy a low emissions car (as I've done yet), but what about my neighbour? He would like to do the same? That is what happens in the different States or regions around the world: that is an effort we have to do together if we want to act effectively.

Waiting for it, we can only to cope with the change. Climate change, in fact, is a GLOBAL PROBLEM WITH LOCAL ISSUES. In this perspective, local communities are in the first line in that battle. From this point of view, we easily can recognize that is not the first time that humans have to challenge it. Natural climate changes has in fact occurred many times during the history of humankind. Generally, these changes have been low, gradual; often instead they have been sudden, catastrophic with their effects. The destiny of ancient cultures has been different too, collapsing or successfully coping with it.





How the study of the past can be useful to plan the future? Because climate change is a HUMAN AFFAIR: we are not only responsible of the change itself, as science has well demonstrated, but we are also able to find the right strategies to cope with changes, both in an adapting way, and finding the resources to be resilient in face of the changes; because we live in a human-environmental system, where society is closely linked to the nature. In this way, climate change is a HUMANITIES AFFAIR, a multidisciplinary collaborative field of study between the "hard sciences" and anthropology, geography, history and archaeology.


This is the aim of this research: studying the past to find the relation between society and environment and to investigate the critical relation between them. I'll try to report it as a storytelling, to drive you in this fascinating and challenging journey.