Arctic hydroclimate variability during the last 2000 years: current understanding and research challenges-猫眼课题宝

DOI：

10.5194/cp-14-473-2018

发表时间：

2017-03

期刊：

Climate of The Past

影响因子：

4.3

通讯作者：

中科院分区：

地球科学2区

文献类型：

作者：

H. Linderholm;M. Nicolle;P. Francus;K. Gajewski;S. Helama;A. Korhola;O. Solomina;Zicheng Yu;Peng Zhang;W. D'Andrea;M. Debret;D. Divine;B. Gunnarson;N. Loader;N. Massei;Kristina Seftigen;E. Thomas;J. Werner;Sofia Andersson;Annika Berntsson;T. Luoto;Liisa Nevalainen;S. Saarni;M. Väliranta

抽象的。再分析数据显示，北极降水在20世纪有增加的趋势，但不同季节或空间的变化并不均匀。所观察到的水气候变化预计将在下个世纪继续并可能加速，不仅影响泛北极自然生态系统和人类活动，而且通过大气和海洋环流影响较低纬度。然而，由于缺乏时空观测数据，很难对北极水气候变化进行可靠的量化，特别是在长期背景下。为了在仪器记录之前了解北极水气候及其变异性，需要气候替代记录。本综述的目的是总结过去2000年来对北极水气候的当前认识。首先，本文回顾了用于推断这一偏远地区过去水文气候变化的主要自然档案和指标，并概述了在这些记录中从温度信号中分离水分的困难。其次，对来自北美和芬诺斯坎迪亚两个数据丰富地区的两套涵盖共同时代的水文气候记录进行比较，揭示了区域间和区域内的差异。第三，在前人工作的基础上，本文展示了为北极提供高分辨率水文气候重建的潜力，并与完全耦合气候模式的上一个千年的模拟进行了比较。总体而言，水文气候指标和模拟表明，中世纪气候异常倾向于比小冰期(LIA)更潮湿，但存在很大的区域差异。然而，代理数据的区域覆盖范围不够，欧亚大陆大部分地区和北美部分地区存在明显的数据差距，使得目前无法对整个北极地区进行强有力的评估。为了全面评估过去2000年的泛北极水气候变异性，需要更多的替代记录。

Abstract. Reanalysis data show an increasing trend in Arctic precipitation over the 20th century, but changes are not homogenous across seasons or space. The observed hydroclimate changes are expected to continue and possibly accelerate in the coming century, not only affecting pan-Arctic natural ecosystems and human activities, but also lower latitudes through the atmospheric and ocean circulations. However, a lack of spatiotemporal observational data makes reliable quantification of Arctic hydroclimate change difficult, especially in a long-term context. To understand Arctic hydroclimate and its variability prior to the instrumental record, climate proxy records are needed. The purpose of this review is to summarise the current understanding of Arctic hydroclimate during the past 2000 years. First, the paper reviews the main natural archives and proxies used to infer past hydroclimate variations in this remote region and outlines the difficulty of disentangling the moisture from the temperature signal in these records. Second, a comparison of two sets of hydroclimate records covering the Common Era from two data-rich regions, North America and Fennoscandia, reveals inter- and intra-regional differences. Third, building on earlier work, this paper shows the potential for providing a high-resolution hydroclimate reconstruction for the Arctic and a comparison with last-millennium simulations from fully coupled climate models. In general, hydroclimate proxies and simulations indicate that the Medieval Climate Anomaly tends to have been wetter than the Little Ice Age (LIA), but there are large regional differences. However, the regional coverage of the proxy data is inadequate, with distinct data gaps in most of Eurasia and parts of North America, making robust assessments for the whole Arctic impossible at present. To fully assess pan-Arctic hydroclimate variability for the last 2 millennia, additional proxy records are required.

Arctic hydroclimate variability during the last 2000 years: current understanding and research challenges

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