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| Lachniet, Matthew S.; Johnson, Leah; Asmerom, Yemane; Burns, Stephen J.; Polyak, Victor; Patterson, William P.; Burt, Lindsay; Azouz, April. |
| We present a high-resolution terrestrial archive of Central American rainfall over the period 100-24 and 8.1-6.5 ka, based on delta(18)O time series from U-series dated stalagmites collected from a cave on the Pacific Coast of Costa Rica. Our results indicate substantial delta(18)O variability on millennial to orbital time scales that is interpreted to reflect rainfall variations over the cave site. Correlations with other paleoclimate proxy records suggest that the rainfall variations are forced by sea surface temperatures (SST) in the Atlantic and Pacific Oceans in a fashion analogous to the modern climate cycle. Higher rainfall is associated with periods of a warm tropical North Atlantic Ocean and large SST gradients between the Atlantic and Pacific... |
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| Ano: 2009 |
URL: https://archimer.ifremer.fr/doc/00219/33020/31488.pdf |
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| Pilcher, Darren J.; Brody, Sarah R.; Johnson, Leah; Bronselaer, Benjamin. |
| The ability of Earth System Models to accurately simulate the seasonal cycle of the partial pressure of CO2 in surface water (pCO(2)(SW)) has important implications for projecting future ocean carbon uptake. Here we develop objective model skill score metrics and assess the abilities of 18 CMIP5 models to simulate the seasonal mean, amplitude, and timing of pCO(2)(SW) in biogeographically defined ocean biomes. The models perform well at simulating the monthly timing of the seasonal minimum and maximum of pCO(2)(SW), but perform somewhat worse at simulating the seasonal mean values, particularly in polar and equatorial regions. The results also illustrate that a single "best'' model can be difficult to determine, despite an analysis restricted to the... |
| Tipo: Text |
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| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00292/40368/38952.pdf |
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