Dept. of Earth System Science, University of California, Irvine, 3200 Croul Hall, Irvine, CA, USA.
Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA.
Nat Commun. 2023 Apr 20;14(1):2279. doi: 10.1038/s41467-023-37700-9.
The timing and mechanisms of past hydroclimate change in northeast Mexico are poorly constrained, limiting our ability to evaluate climate model performance. To address this, we present a multiproxy speleothem record of past hydroclimate variability spanning 62.5 to 5.1 ka from Tamaulipas, Mexico. Here we show a strong influence of Atlantic and Pacific sea surface temperatures on orbital and millennial scale precipitation changes in the region. Multiple proxies show no clear response to insolation forcing, but strong evidence for dry conditions during Heinrich Stadials. While these trends are consistent with other records from across Mesoamerica and the Caribbean, the relative importance of thermodynamic and dynamic controls in driving this response is debated. An isotope-enabled climate model shows that cool Atlantic SSTs and stronger easterlies drive a strong inter-basin sea surface temperature gradient and a southward shift in moisture convergence, causing drying in this region.
墨西哥东北部过去水文气候变化的时间和机制受到很大限制，限制了我们评估气候模型性能的能力。为了解决这个问题，我们提供了一份来自墨西哥塔毛利帕斯的跨越 62.5 至 5.1 千年前的过去水文气候变化的多代用石笋记录。这里我们表明，大西洋和太平洋海表温度对该地区轨道和千年尺度降水变化有强烈影响。多个代理指标均未对太阳辐射强迫表现出明显的响应，但有大量证据表明 Heinrich 盛冰期期间气候干燥。尽管这些趋势与中美洲和加勒比地区的其他记录一致，但在驱动这种响应中，热力学和动力控制的相对重要性仍存在争议。一个启用同位素的气候模型表明，较冷的大西洋 SST 和更强的东风导致强烈的跨盆地海表温度梯度和水汽辐合向南移动，导致该地区干燥。
