NOAA/WDS Paleoclimatology - Northern Hemisphere Extra-Tropics 2,000yr Decadal Temperature Reconstruction

A new temperature reconstruction with decadal resolution, covering the last two millennia, is presented for the extratropical Northern Hemisphere (90-30°N), utilizing many palaeotemperature proxy records never previously included in any large-scale temperature reconstruction. The amplitude of the reconstructed temperature variability on centennial time-scales exceeds 0.6°C. This reconstruction is the first to show a distinct Roman Warm Period c. AD 1-300, reaching up to the 1961-1990 mean temperature level, followed by the Dark Age Cold Period c. AD 300-800. The Medieval Warm Period is seen c. AD 800–1300 and the Little Ice Age is clearly visible c. AD 1300-1900, followed by a rapid temperature increase in the twentieth century. The highest average temperatures in the reconstruction are encountered in the mid to late tenth century and the lowest in the late seventeenth century. Decadal mean temperatures seem to have reached or exceeded the 1961-1990 mean temperature level during substantial parts of the Roman Warm Period and the Medieval Warm Period. The temperature of the last two decades, however, is possibly higher than during any previous time in the past two millennia, although this is only seen in the instrumental temperature data and not in the multi-proxy reconstruction itself. Our temperature reconstruction agrees well with the reconstructions by Moberg et al. (2005) and Mann et al. (2008) with regard to the amplitude of the variability as well as the timing of warm and cold periods, except for the period c. AD 300-800, despite significant differences in both data coverage and methodology.

这份存档的古气候学研究（Paleoclimatology Study）可从NOAA国家环境信息中心（NCEI）获取，该中心隶属于古气候学世界数据服务（WDS）。相关的NCEI研究类型为气候重建（Climate Reconstruction）。数据包含北半球地区的气候重建参数。时间覆盖范围为公元纪年的距今时间（BP）从1950年到-49年。有关参数和研究地点的详细信息，请参阅元数据。使用数据时请引用本研究。