Collaborative Rsrch: Species Responses to Changes in Climate Across Arctic Gradients Using the North America ITEX Network (NATEX): Influences On Community and Ecosystem Processe

协作研究：利用北美 ITEX 网络（NATEX）对北极梯度气候变化的物种反应：对群落和生态系统过程的影响

• 批准号: 9907127
• 负责人: Marilyn Walker
• 金额: $ 98.5万
• 依托单位: University of Alaska Fairbanks Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-15 至 2004-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9907127&HistoricalAwards=false
• 关键词: Collaborative; Rsrch; Species; Responses; Changes

The researchers will continue to provide the US component to the International Tundra EXperiment (ITEX). ITEX uses a very simple experiment throughout the Arctic to examine the potential effects of global warming on Arctic tundra. Small open-topped plexiglass cones are placed on the tundra to cause a 2-4 degree warming similar to that predicted for atmospheric temperatures in response to a doubling of carbon dioxide in the atmosphere from increased emission of greenhouse gases. Botanical variables are measured within and outside the cones to determine effects caused by the induced warming. The relationship of the changes in the tundra produced by the manipulative heating experiment are used to predict future change occurring in response to global warming. The US research component of conducts a research program at Toolik Lake, Atqasuk, and Barrow Alaska and at one site in Canada in conjunction with Canadian researchers. The results of the ITEX Project are very important for reliable forecasts of the response of Arctic tundra to global warming. Those forecasts are critical to understanding the role of the Arctic in the global carbon cycle and the sustainability of natural resources in response to global change.

研究人员将继续为国际苔原实验(ITEX)提供美国部分。ITEX在整个北极地区进行了一项非常简单的实验，以研究全球变暖对北极冻土带的潜在影响。小的开顶有机玻璃锥体被放置在冻土带上，以引起2-4度的升温，与预测的大气温度类似，以应对温室气体排放增加导致大气中二氧化碳增加一倍。测量锥体内外的植物学变量，以确定诱导变暖所造成的影响。操纵加热实验产生的冻土带变化之间的关系被用来预测未来发生的变化，以应对全球变暖。的美国研究部分与加拿大研究人员一起在图利克湖、阿特卡苏克和阿拉斯加巴罗以及加拿大的一个地点开展了一项研究计划。ITEX项目的结果对于可靠预测北极冻土带对全球变暖的反应非常重要。这些预测对于理解北极在全球碳循环中的作用以及应对全球变化的自然资源的可持续性至关重要。