IPCC Fourth Assessment Report (AR4) Observed Climate Change Impacts Database

The Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4) Observed Climate Change Impacts Database contains observed responses to climate change across a wide range of systems as well as regions. These data were taken from the Intergovernmental Panel on Climate Change Fourth Assessment Report and Rosenzweig et al. (2008). It consists of responses in the the physical, terrestrial biological systems and marine-ecosystems. The observations that were selected include data that demonstrate a statistically significant trend in change in either direction in systems related to temperature or other climate change variable, and the is for at least 20 years between 1970 and 2004, although study periods may extend earlier or later. For each observation, the data series is described in terms of system, region, longitude and latitude, dates and duration, statistical significance, type of impact, and whether or not land use was identified as a driving factor. System changes are taken from ~80 studies (of which ~75 are new since the IPCC Third Assessment Report) containing more than 29,500 data series. Observations in the database are characterized as a "change consistent with warming" or a "change not consistent with warming", based on information from the underlying studies.

政府间气候变化专门委员会（Intergovernmental Panel on Climate Change，IPCC）第四次评估报告（Fourth Assessment Report，AR4）观测气候变化影响数据库，收录了多系统、多区域针对气候变化的实测响应数据。该数据集源自政府间气候变化专门委员会第四次评估报告以及Rosenzweig等人（2008）的研究成果，涵盖物理系统、陆地生物系统与海洋生态系统的相关响应。
入选的观测数据需满足：在与气温或其他气候变化变量相关的系统中，呈现出任一方向的统计学显著变化趋势，且观测时段至少持续20年；观测时段可覆盖1970年至2004年，也可提前或延后。
每条观测数据均包含系统类型、所在区域、经纬度、观测日期与持续时长、统计学显著性、影响类型，以及土地利用是否被认定为驱动因子等信息。本数据库的系统变化相关数据来自约80项研究（其中约75项为IPCC第三次评估报告发布后新增的研究），总计包含超过29500条数据序列。
数据库内的观测结果可依据原始研究信息，划分为"与变暖趋势一致的变化"与"与变暖趋势不一致的变化"两类。