IAI Workshop: The Assessment of Present, Past and Future Climate Variability in the Americas from Treeline Environments

Luckman树线是山区关键的气候敏感过渡带，一直是许多环境变化研究的焦点。了解这些环境的现在和以前的动态对这些记录的解释至关重要。IGBP-PAGES在美洲采用PEP-I样带概念，为沿着美洲科迪勒拉山脉的树线或附近工作的科学家提供了无与伦比的合作研究机会。这项建议要求IAI开办补助金第一阶段提供资金，以便于1996年9月底至10月初在加拿大阿尔伯塔省贾斯帕举行一次讲习班，集中讨论沿美洲科迪勒拉山脉的树木线环境。会议将汇集来自IAI成员国的科学家，他们是古生态学、树木年代学和气候学等广泛领域的专家。这种混合将使该小组能够制定科学计划，以了解当前树线环境的动态，并重建树线站点的环境和气候变化。与会者将审查目前关于美国科迪勒拉地区树线环境的信息基础，并讨论协作性比较研究的制定，这些研究将评估和基准化在现代树线地点发现的气候信号，并确定这种敏感环境对近期气候变化的响应；建立一个可比较的高分辨率代用气候序列网络，以显示关键地区近1000年来树线上的内部气候变化；并利用这些数据来研究内部和长期气候变率的局部和区域模式，以发展关于强迫函数的关键时空模式的数据。本次会议将为实施这一科学议程的IAI启动资助第二阶段制定一系列合作的、国际的、跨学科的研究建议。树线是气候敏感的关键山区，一直是许多环境变化研究的焦点。了解这些环境的现在和以前的动态对这些记录的解释至关重要。国际地圈生物圈计划的“过去全球变化计划”（IGBP-PAGES）在美洲采用极-赤道-极（PEP-I）样带概念，为沿着美洲科迪勒拉山脉的树线或树线附近工作的科学家提供了无与伦比的合作研究机会。这项建议要求IAI开办补助金第一阶段提供资金，以便于1996年9月底至10月初在加拿大艾伯塔省贾斯帕举行一次会议，并集中讨论沿美洲科迪勒拉山脉的林木线环境。会议将汇集来自IAI成员国的科学家，他们是古生态学、树木年代学和气候学等广泛领域的专家。这种混合将使该小组能够制定科学计划，以了解当前树线环境的动态，并重建树线站点的环境和气候变化。本次会议计划推动一系列合作、国际、跨学科的IAI第二阶段启动资助研究的发展，以实施这一科学议程。这些提案将通过促进在山区环境和气候变化方面有共同利益的几个IAI成员国的科学家和机构的合作研究，促进和加强IAI的科学目标。它们还将把地球、生命和物理科学领域的不同科学专家聚集在一起，并激发他们之间的互动，他们以截然不同的方式关注同一环境。会议的另一项成果将是论文集（“美洲的树线环境”），其中将总结会议上提出的资料和讨论。本提案的与会者来自下列IAI国家：阿根廷；玻利维亚;加拿大;智利;美国；和委内瑞拉。这些国家是美洲全球变化研究倡议的会员国，这是一项促进美洲就全球变化问题进行合作研究的倡议。美国国家科学基金会是美国政府指定的在IAI中履行美国职责的机构。＊＊＊

9530427 Luckman Treelines are critical, climate-sensitive, ecotones in mountain areas that have been the focus of many studies of environmental change. Understanding the present and former dynamics of these environments is crucial to the interpretation of these records. The adoption of PEP-I transect concept for the Americas by IGBP-PAGES offers unparalleled opportunities for collaborative studies by scientists working at or near treelines along the length of the American Cordillera. This proposal requests IAI Start-Up Grant Phase I funding to hold a workshop in Jasper, Alberta, Canada in late September- early October 1996, to focus on treeline environments along the American Cordillera. The meeting will bring together scientists from IAI member countries who are experts in a wide range of fields: paleoecology, dendrochronology, and climatology. This mix will allow the group to formulate a science plan for the understanding of the dynamics of present treeline environments, and the reconstruction of environmental and climate changes at treeline sites. The participants will review the present information base on treeline environments along the American Cordillera and discuss the formulation of collaborative, comparative studies, that will evaluate and benchmark the climate signals found at modern treeline sites and determine the response of this sensitive environment to recent climate variation; develop a network of comparable high resolution proxy climate series that show internal climate variation at treeline over the last ca 1000 years for key localities; and utilize these data to examine the local and regional patterns of internal and longer term climate variability to develop data on key temporal and spatial patterns of forcing functions. This meeting will lead to the development of a series of collaborative, international, interdisciplinary research proposals for Phase II of the IAI Start-Up Grants that implement this scientific agenda. %%% Treelines are critical, climate-sensiti ve mountain areas that have been the focus of many studies of environmental change. Understanding the present and former dynamics of these environments is crucial to the interpretation of these records. The adoption of the Pole-Equator-Pole (PEP-I) transect concept for the Americas by the International Geosphere Biosphere Programme's "Past Global Changes Program" (IGBP-PAGES) offers unparalleled opportunities for collaborative studies by scientists working at or near treelines along the length of the American Cordillera. This proposal requests IAI Start-Up Grant Phase I funding to hold a meeting in Jasper, Alberta, Canada in late September- early October 1996 and to be focused on treeline environments along the American Cordillera. The meeting will bring together scientists from IAI member countries who are experts in a wide range of fields: paleoecology, dendrochronology, and climatology. This mix will allow the group to formulate a science plan for the understanding of the dynamics of present treeline environments, and the reconstruction of environmental and climate changes at treeline sites. This meeting is planned to lead to the development of a series of collaborative, international, interdisciplinary Phase II IAI Start-Up Grants research that implement this scientific agenda. These proposals will promote and enhance the IAI scientific goals by fostering collaborative studies by scientists and institutions in several IAI member states that share common interests in mountain environments and climate change. They will also bring together and provoke interaction among a diverse group of scientific specialists in the earth, life and physical sciences who focus on the same environment in quite different ways. An additional outcome of the meeting will be a proceedings volume ("Treeline Environments of the Americas") that will summarize the information and discussion presented at the meeting. Participants of this proposal are from the following IAI countries: Argentina; Bolivia; Canada ; Chile; the United States; and Venezuela. These countries are Member States of the IAI, an initiative to stimulate cooperative research on global change issues in the Americas. The National Science Foundation is the designated U.S. Government to carry out U.S. responsibilities within the IAI. ***