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    STUDIA GEOLOGIA - Ediţia nr.1 din 2007  
         
  Articol:   RECONSTRUCTING THE HOLOCENE CLIMATE RECORD IN WESTERN USA BASED ON δ18O AND δ13C IN SPELEOTHEMS.

Autori:  VASILE ERSEK, ALAN C. MIX, PETER U. CLARK, HAI CHENG, LAWRENCE R. EDWARDS. 		 
       
         
  Rezumat:  The Pacific Northwest region of the United States is strongly influenced by the Pacific Ocean, which has been one of the strongest sources of regional-to-global climate variability during the Holocene. Although the modern spatial patterns of climate fluctuations affecting the Pacific basin at seasonal, interannual, and decadal timescales are reasonably well understood, the relative brevity of the instrumental record (~120 years) and of the tree ring record (~1000 years) limits our understanding of how this variability may have changed on longer timescales. Given the major influence that the Pacific Ocean exerts on regional-to-global climate, it is particularly important to address this question in order to understand the past role of the Pacific on past climate of North America, as well as its potential role in future climate change. Here we present a high-resolution reconstruction of Holocene climate using stable isotopes in speleothems from Oregon Caves National Monument (OCNM) in southwestern Oregon, USA (42ºN, 123ºW). OCNM is strongly influenced by air masses originating in the Pacific Ocean and is strategically situated in an area where storm track are entering North America.  
         
     
         
         
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