Tree-Ring Formation, Isotopes, and El Nino in Ponderosa Pine of the Southwest

西南黄松的年轮形成、同位素和厄尔尼诺现象

• 批准号: 9810474
• 负责人: Steven Leavitt
• 金额: $ 30.7万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-10-01 至 2002-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9810474&HistoricalAwards=false
• 关键词: Tree; Ring; Formation; Isotopes; El

Abstract ATM-9810474 Leavitt, Steven W. University of Arizona Title: Tree-Ring Formation, Isotopes, and El Nino in Ponderosa Pine of the Southwest Climate conditions and variability over several centuries in the American Southwest have been investigated via standard dendroclimatological research during the past few decades. Analysis of reconstructed data and modern instrumental data indicates this region's climate appears particularly impacted by El Nino teleconnections and the vagaries of the annual southwestern summer monsoon. New tools in the form of stable isotopes have recently become a viable option for probing present and past climate by means of analysis of tree rings and precipitation. This award supports a study designed to establish the linkage between tree-ring isotopic composition and environment (including climate). The primary focus of the proposed research will be to advance the numerical tree-ring growth process model through the addition of isotopic subroutines. The fundamental goal of the process model development is to take inputs of climate and isotopic composition of atmosphere and soil (water), and accurately generate the detailed patterns of isotopic variation (and cell size) for individual wood cells within rings. The isotopic experimentation and model development will go hand-in-hand to better understand relationships of isotopic composition and climate. With escalating use of tree-ring isotopes in climate research, especially at the subannual level, this model should provide important guidance to understanding the isotopic results.

在过去的几十年里，通过标准的树木气候学研究，研究了美国西南部几个世纪以来的气候条件和变率。对重建数据和现代仪器数据的分析表明，该地区的气候似乎特别受到厄尔尼诺遥相关和每年西南夏季风的变幻莫测的影响。稳定同位素形式的新工具最近已成为通过分析树木年轮和降水来探测现在和过去气候的可行选择。该奖项支持一项旨在建立树木年轮同位素组成与环境（包括气候）之间联系的研究。提出的研究重点将是通过增加同位素子程序来推进树木年轮生长过程的数值模型。过程模型开发的基本目标是接受气候和大气、土壤（水）同位素组成的输入，并准确生成年轮内单个木材细胞的同位素变化（和细胞大小）的详细模式。同位素实验和模式开发将携手并进，以更好地了解同位素组成与气候的关系。随着年轮同位素在气候研究中的应用不断增加，特别是在次年水平上，该模型将为理解同位素结果提供重要的指导。