Effects of tropical sea surface temperature (SST) errors on the Antarctic atmospheric circulation of HadCM3
Effects of tropical sea surface temperature (SST) errors on the Antarctic atmospheric circulation of HadCM3.
Abstract This paper investigate the large mean sea level pressure errors in the HadCM3 atmosphere-ocean global climate model around Antarctica and finds them to be caused by the sea surface temperature (SST) errors in the winter tropics.
This teleconnection is explained by the warm tropical SST anomalies causing anomalous ascent which strengthens the Hadley circulation and increases the high-level (∼200hPa) divergence.
By imposing SST anomalies, in the atmosphere only model, in different ocean basins it is shown that it is the SST errors over Indonesia and the eastern tropical Atlantic that are responsible for these wave trains; and hence, primarily responsible for the pressure anomalies.
By contrast, a large SST error over the eastern tropical Pacific does not cause a wave train to be generated because it does not generate strong ascent.
Turner (2007 ), Effects of tropical sea surface temperature (SST) errors on the Antarctic atmospheric circulation of HadCM3 , Geophys.
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Abrupt changes in early Holocene tropical sea surface temperature derived from coral records
Corals have recently been shown to provide an important source of tropical climate records because they can be easily and accurately dated, using either 14 C or 230 Th, and because past sea surface temperatures can be recovered from the Sr/Ca ratios in coral skeletons.
Here we use this technique to derive several early Holocene sea surface temperature records from a coral drill core recovered from Espiritu Santo, Vanuatu in the tropical southwest Pacific Ocean.
These records indicate that sea surface temperatures in this region were depressed by as much as 6.5 °C below modern values at 10, 350 calendar years BP, but rose very abruptly during the following 1, 500 years.
This temperature increase lags the post-Younger Dryas increase observed in a coral record from the tropical Atlantic Ocean 3 by about 3, 000 years, an unexpected phase-shift that may ultimately shed light on the mechanisms of deglacial climate change.
| ISI | CLIMAP Project Members Seasonal Reconstructions of the Earth's Surface at the Last Glacial Maximum (Map and Chart Ser., MC-36, Geol.