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Figure 6‐1. Locations <strong>of</strong> <strong>the</strong> PMCH tracer release point in Monterfil , France <strong>and</strong> sampling<br />

receptors for <strong>the</strong> 1994 European Tracer Experiment (ETEX).<br />

6.1.2 Synoptic Conditions<br />

Numerous synoptic surface <strong>and</strong> upper air observations were made by participating<br />

meteorological agencies as part <strong>of</strong> this experiment. Two separate extratropical cyclonic<br />

systems were present over <strong>the</strong> European continent at <strong>the</strong> time <strong>of</strong> <strong>the</strong> release. A strong<br />

extratropical cyclone was located over <strong>the</strong> North Sea with a central pressure <strong>of</strong> 980 mb. A<br />

second, significantly weaker, extratropical cyclone was located near <strong>the</strong> Balkan Peninsula over<br />

<strong>the</strong> Black Sea, having a central pressure <strong>of</strong> 1010 mb. These cyclonic systems were important to<br />

<strong>the</strong> transport <strong>of</strong> <strong>the</strong> PMCH tracer cloud. Figure 6‐2 depicts <strong>the</strong> locations <strong>of</strong> <strong>the</strong> extratropical<br />

cyclonic systems during <strong>the</strong> ETEX field study.<br />

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