Incoherency in Central American Hydroclimate Proxy Records Spanning the Last Millennium
Incoherency in Central American Hydroclimate Proxy Records Spanning the Last Millennium
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DOI：
10.1029/2022pa004445
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发表时间：
2023-03
影响因子：
3.5
通讯作者：
Jonathan Obrist‐Farner;B. Steinman;N. Stansell;J. Maurer
中科院分区：
文献类型：
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作者：
Jonathan Obrist‐Farner;B. Steinman;N. Stansell;J. Maurer
持续的全球变暖预计会导致精确度降低，并且在中美洲的驾驶员气氛中，由于模型的空间分辨率限制和跨时空的观察数据覆盖率不足，因此对未来的变化的预测非常不确定。因此，在全球气候重组时期了解区域气候反应至关重要。危地马拉的变化以及跨越上千年的中美洲氢化记录的合成（800-2000 CE）。热带收敛区的位置，这已被大量研究引用，以解释中美洲的可变性圆周的代理记录，不能单独解释观察到的氢化变化模式，而是多种海洋 - 大气过程之间的相互作用及其在可变地形外观上的不同影响，从而导致了这些复杂性的复杂性。整个中美洲的降水变化，并指出需要在外部强迫和氢化气候变化之间的关系可以鲁spard，有助于基于模型的对未来对全球变暖的反应的预测。
Continued global warming is expected to result in reduced precipitation and a drier climate in Central America. Projections of future changes are highly uncertain, however, due to the spatial resolution limitations of models and insufficient observational data coverage across space and time. Paleoclimate proxy data are therefore critical for understanding regional climate responses during times of global climate reorganization. Here we present two lake‐sediment based records of precipitation variability in Guatemala along with a synthesis of Central American hydroclimate records spanning the last millennium (800–2000 CE). The synthesis reveals that regional climate changes have been strikingly heterogeneous, even over relatively short distances. Our analysis further suggests that shifts in the mean position of the Intertropical Convergence Zone, which have been invoked by numerous studies to explain variability in Central American and circum‐Caribbean proxy records, cannot alone explain the observed pattern of hydroclimate variability. Instead, interactions between several ocean‐atmosphere processes and their disparate influences across variable topography appear to have resulted in complex precipitation responses. These complexities highlight the difficulty of reconstructing past precipitation changes across Central America and point to the need for additional paleo‐record development and analysis before the relationships between external forcing and hydroclimate change can be robustly determined. Such efforts should help anchor model‐based predictions of future responses to continued global warming.