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|MEDSPIRATION: Proof of a warming world could be written on water
|A new ESA-funded office in the UK is co-ordinating international efforts to map global sea surface temperature in unprecedented detail.
|The oceans function as vast reservoirs of heat: the top two metres of ocean alone store all the equivalent energy contained in the atmosphere, while the whole of their waters store more than a thousand times this same value. Because they cover 71% of the Earth's surface the oceans directly absorb the majority of solar heat, storing it for long periods of time by comparison to either the land or atmosphere. In effect, the oceans act as the Earthâ€™s battery.
It takes a lot of energy and time to shift sea temperature: it is for this reason that oceans are termed the 'memory' of the Earth's climate system, and it means that tracking sea surface temperature (SST) over a long period is the most reliable way researchers know of proving whether global temperatures really are increasing.
Besides answering this fundamental question, measuring the SST value also improves the accuracy of our climate change models and weather forecasts. Heat energy slowly released from the sea is the dominant driver of atmospheric circulation and weather patterns. SST influences the rate of energy transfer to the atmosphere, as evaporation increases with temperature.
An international endeavour called the Global Ocean Data Assimilation Experiment (GODAE) is intended to develop a range of operational ocean analysis and prediction systems for the world's oceans. Among the most ambitious is known as the GODAE High Resolution Sea Surface Temperature Pilot Project (GHRSST-PP) and aims to deliver to the user community a new generation of highly accurate worldwide SST products with a space resolution of less than 10 km every six hours.
Achieving a reliable operational system requires the integration of near real time SST data gathered from a variety of different satellites as well as in-situ sources. The two types of data complement one another: spacecraft provide wide-area sea views, but their resolution may be limited and the time they take to revisit the same stretch of ocean is too high:
Under the GHRSST-PP framework, satellite and in-situ data streams will be converted into common international format products on regional basis by Regional Data Assembly Centres (RDACs). A Global Data Analysis Centre (GDAC) will then analyses these data and produce global coverage products.
The GHRSST-PP International project office is based at the Hadley Centre for climate prediction and research, Met Office, UK, which provides a unique blend of operational ocean and weather prediction and world class research. The Met Office has recently relocated to purpose built headquarters in Exeter, UK.
Over the next 3 years, the project office will coordinate GHRSST-PP activities in the USA, Japan, Australia and Europe including close collaboration with the user operational and scientific user community driving the project forwards.