Return to Little Harbor, Santa Catalina Island, California: A Critique of the Marine Paleotemperature Model
Return to Little Harbor, Santa Catalina Island, California: A Critique of the Marine Paleotemperature Model
复制标题
返回加利福尼亚州圣卡塔利娜岛的小港：对海洋古温度模型的批判
作者：
L. Raab;K. Bradford;Judith F. Porcasi;W. J. Howard
海洋古温度是许多沿海地区维持生计的一个重要因素，也可能是海洋社会演变的一个重要因素。加州一个跨越8000个历年的古温度模型，将海洋表面温度较高的时期与海洋生存生产力下降联系在一起。最近一项涉及这一模型的案例研究表明，公元1150至1300年间的气候变暖是海峡群岛北部居民生存困难的一个主要原因。根据与其他地点和高海温时期的数据比较，这些结果是有问题的。小港湾遗址是海峡群岛研究最广泛的遗址之一，它的研究表明，大约5200年前的高海温可能导致了温暖水域的动物群，但并没有造成饥饿。来自随后变暖周期的其他地点的证据，包括公元1150至1300年间的事件，也表明了类似的结论。了解长期和短期海洋温度循环的影响，只关注全新世古温度曲线的一小部分，以及食物丰度受海洋温度影响的证据薄弱，这些都是在可以接受古温度模型的有效性之前必须克服的问题。
Marine paleotemperature is a significant factor in the subsistence productivity of many coastal regions and may be an important factor in the evolution of maritime societies. A California paleotemperature model, spanning 8,000 calendar years, correlates periods of high sea surface temperatures with decreased marine subsistence productivity. A recent case study involving this model identified warming conditions between A.D. 1150 to 1300 as a major cause of subsistence distress for dwellers of the northern Channel Islands. These results are questionable, based on a comparison with data from other sites and periods of high sea temperature. Research at the Little Harbor site, one of the most extensively researched in the Channel Islands, shows that high sea temperature about 5,200 calendar years ago may have introduced warm-water faunas but not starvation conditions. Evidence from other sites occupied during subsequent warming cycles, including the event between A.D. 1150 to 1300, points to similar conclusions. Understanding the effects of long- and short-term ocean temperature cycles, a focus on only a small segment of the Holocene paleotemperature curve, and weak evidence that food abundance was affected by sea temperature are problems that must be overcome before the validity of the paleotemperature model can be accepted.