Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 41, Issue 15, Pages 5644-5652Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL060205
Keywords
heatwave; supersites; analogs of circulation; mesoscale model
Categories
Funding
- Cloudnet project (European Union) [EVK2-2000-00611]
- ERC [338965-A2C2]
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July 2006 was particularly warm in Europe. The consistency of this kind of anomaly with large-scale circulation conditions or local processes is a key issue for regional climate evolution. Using observations from space and ground-based observatory, together with simulations from regional model, shows that two concomitant but disconnected drivers explain this heatwave. The first driver corresponds to large-scale conditions (specific atmospheric condition with advection of continental air favoring clear sky). The second condition relates to local processes (dry soil, amplifying surface temperature in heatwave for first 5days, and making this event warm enough to induce a monthly mean anomaly). This large-scale event is studied at a site in northern France, where comprehensive observation data carefully reanalyzed are available. A regional model is able to produce the amplitude of the event, for both temperature and cloud large-scale anomalies. Coupling model and observations allow discriminating the surface contribution to the temperature anomaly.
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