Denommee K C, Bentley S J, Droxler A W
1] Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA, 70803, USA [2] Coastal Studies Institute, Louisiana State University, Baton Rouge, LA, 70803, USA.
Department of Earth Sciences, Rice University, Houston, TX, 77005, USA.
Sci Rep. 2014 Jan 27;4:3876. doi: 10.1038/srep03876.
Tropical cyclones (TCs) are powerful agents of destruction, and understanding climatic controls on TC patterns is of great importance. Over timescales of seasons to several decades, relationships among TC track, frequency, intensity and basin-scale climate changes are well documented by instrumental records. Over centuries to millennia, climate-shift influence on TC regimes remains poorly constrained. To better understand these relationships, records from multiple locations of TC strikes spanning millennia with high temporal resolution are required, but such records are rare. Here we report on a highly detailed sedimentary proxy record of paleo-TC strikes from the Blue Hole of Lighthouse Reef, Belize. Our findings provide an important addition to other high-resolution records, which collectively demonstrate that shifts between active and inactive TC regimes have occurred contemporaneously with shifts hemispheric-scale oceanic and atmospheric circulation patterns such as MDR SSTs and NAO mode, rather than with changes in local climate phenomena as has previously been suggested.
热带气旋(TCs)是强大的破坏力量,了解气候对热带气旋模式的控制至关重要。在季节到几十年的时间尺度上,仪器记录充分记录了热带气旋路径、频率、强度与流域尺度气候变化之间的关系。在几个世纪到几千年的时间里,气候转变对热带气旋状态的影响仍然受到很大限制。为了更好地理解这些关系,需要来自多个地点的跨越数千年且具有高时间分辨率的热带气旋袭击记录,但这样的记录很少见。在这里,我们报告了来自伯利兹灯塔礁蓝洞的古热带气旋袭击的高度详细的沉积代理记录。我们的发现为其他高分辨率记录提供了重要补充,这些记录共同表明,活跃和不活跃的热带气旋状态之间的转变与半球尺度的海洋和大气环流模式(如大西洋副热带海域海表温度和北大西洋涛动模式)的转变同时发生,而不是像之前所认为的那样与当地气候现象的变化同时发生。