Collaborative Research: A Holocene History of the El Nino/Southern Oscillation, Solar Variability, and the Central American Monsoon from Speleothem Calcite

该奖项将测试热带全新世气候是否受到与厄尔尼诺/南方涛动(ENSO)有关的降雨量的十年至千年尺度变化和/或太阳辐射变化的影响，ENSO是巴拿马地峡气候年际变化的最大来源。将生成覆盖全新世的中美洲石笋的同位素古气候替代记录，并将其与ENSO、太阳辐射和温度的替代记录和气象记录进行比较。这项研究的主要目的是记录全新世ENSO和降雨量的变化。这些记录将使用质谱学方法来分析水和碳酸盐中氧、氢和碳的稳定同位素，使用放射性U系列同位素来确定石笋年代学，并在适当的情况下使用年层厚度计数。这项研究具有原创性和针对性，应该对理解整个全新世的ENSO变异性做出重要贡献。在这项研究期间开发的数据应该有助于与其他热带古气候记录进行比较和关联。

This award will test whether tropical Holocene climate was subject to decadal to millennial scale changes in rainfall amount associated with the El Nino/Southern Oscillation (ENSO), which is the largest source of interannual climate variability on the isthmus of Panama, and/or solar irradiance changes. Isotopic paleoclimate proxy records from Central American stalagmites covering the Holocene will be generated and compared with proxy and meteorological records of ENSO, solar irradiance, and temperature. The primary objective of this research is to document Holocene ENSO and rainfall variability. The records will be produced using mass spectrometric methods to analyze the stable isotopes of oxygen, deuterium, and carbon in water and carbonate, radiogenic U-series isotopes to determine stalagmite chronology, and annual layer thickness counts where appropriate. This research is original and pertinent and should make important contributions to understanding of ENSO variability through the Holocene. Data developed during this study should be useful for comparisons and correlations to other tropical paleoclimate records.