It all starts with the acquisition of more and more data

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santos
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Joined: Sat Apr 15, 2023 4:54 am

It all starts with the acquisition of more and more data

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Proposing a summary vision, essential to orient oneself in these complex questions, this is the fundamental contribution of the IPCC.Could you tell us about your specialty? I am a paleoclimatologist . I study climates in the past and their variations. We try to establish what the environmental conditions were in the different climatic periods. I study the clues that past climate variations have left on the natural environment, for example on ice cores and tree rings. Take water molecules. Hydrogen and oxygen atoms each have a variable number of neutrons (deuterium or hydrogen, oxygen with mass number 16, 17 or 18).


The abundance of these heavy or light water molecules in precipitation depends on the history of water vapor in the atmosphere (from its evaporation to the formation of precipitation in the form of rain or snow ) and therefore Phone Number List climatic conditions. From well-mastered physical principles, mathematical models, and computer simulations, we can understand the climate a few centuries ago, several hundred thousand years ago, perhaps up to 1.5 million years ago if we manage to identify and extract the oldest ice in Antarctica. It's detective work, it's exciting. Data acquisition Can you explain to us how we manage to predict the weather, to predict how the climate will evolve? You have to start by observing the weather.

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Weather observation networks have been built up gradually and are coordinated by the World Meteorological Organization . There is a lot of work on the standards so that the observations are standard, homogeneous, and that we can integrate them into large databases. Some of this data is freely accessible; these are often the raw standard data. Others represent a certain work; they can be redeemed, for example in very specific services for farmers. A characteristic of the data collected is their heterogeneity. We have measurements on land, at sea, by satellite, vertical in the atmosphere… The sampling scales vary in time, in space, as do the precisions, the uncertainties… Grids used to model the atmosphere, the ocean and the continental surfaces (imperfectly because in particular the depth grid for the ocean is missing). IPSL and CEA , Author provided Short-term forecasts All of this data makes it possible to predict the evolution of the weather, to a few days.
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