当前国际古全球变化研究的主要科学问题和任务——极地—赤道—极地大断面

国际地圈－生物圈计划（ＩＧＢＰ）是当前地学领域最重要的科学活动之一，其核心项目“古全球变化（ＰＡＧＥＳ）”的主要目标是研究过去的全球变化问题。而ＰＡＮＡＳＨ计划（南北半球古气候计划）是当前ＰＡＧＥＳ活动的焦点。其主要目标是通过三个ＰＥＰ（极地—赤道—极地）大断面，建立气候变化的序列和相位关系。文章对ＰＡＮＡＳＨ及其三个ＰＥＰ项目的主要科学目标和科学问题进行介绍，并对它们共同的科学问题进行分析。我国是ＰＥＰ－Ⅱ断面的重要组成部分，在该方面研究的程度直接关系到整个ＰＥＰ－Ⅱ的工作。组织好该方面的研究是我们重要的国际科学责任和义务。

SCIENTIFIC QUESTIONS AND TASKS OF PAGES AND THE POLE EQUATOR POLE TRANSECTS

The international geosphere biosphere program (IGBP) is one of the most important activities in the field of geoscience. Its core project “past global change (PAGES)” aims to reconstruct the environmental history in the past and the PANASH program represents the focal task of PAGES. The most important objective of PANASH is to establish the sequences of past climate changes and to determine the phase relationships of different localities of the two hemispheres through the study along three pole equator pole transects (PEPs). In this paper, the major objectives and scientific questions of the three PEP projects are presented and some common scientific interests are analyzed. The Chinese territory represents a highly important part of the PEP Ⅱtransect and the research activities in our country are crucial to the whole PEP Ⅱ project.