{"title":"华盛顿和北俄勒冈州树木年轮序列的长期环境记录","authors":"L. Brubaker, L. Graumlich, S. Vega-gonzález","doi":"10.1109/OCEANS.1989.592878","DOIUrl":null,"url":null,"abstract":"Tree-growth records provide an important source of proxy climatic data for evaluating the uniqueness of 20th-century climates in the Pacific Northwest. Reconstructions of mean annual temperature from upper treeline sites show a prolonged temperature increase during the 20th-century that exceeded the magnitude and duration of any warm period over the past four centuries. Growth of low to mid-elevation continuous forests of western Washington increase during the 20th-century, suggesting an amelioration of climatic limitations. In contrast, tree growth reached minimum values during the 20th-century at drought-sensitive, forest-grassland borders east of the Cascade Mountains. Precipitation reconstructions based on lower treeline sites show severe droughts during 20th-century, but no longterm change in mean precipitation compared to earlier centuries.","PeriodicalId":331017,"journal":{"name":"Proceedings OCEANS","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"1989-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Long Environmental Records Derived From Tree-ring Sequence In Washington And Northern Oregon\",\"authors\":\"L. Brubaker, L. Graumlich, S. Vega-gonzález\",\"doi\":\"10.1109/OCEANS.1989.592878\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Tree-growth records provide an important source of proxy climatic data for evaluating the uniqueness of 20th-century climates in the Pacific Northwest. Reconstructions of mean annual temperature from upper treeline sites show a prolonged temperature increase during the 20th-century that exceeded the magnitude and duration of any warm period over the past four centuries. Growth of low to mid-elevation continuous forests of western Washington increase during the 20th-century, suggesting an amelioration of climatic limitations. In contrast, tree growth reached minimum values during the 20th-century at drought-sensitive, forest-grassland borders east of the Cascade Mountains. Precipitation reconstructions based on lower treeline sites show severe droughts during 20th-century, but no longterm change in mean precipitation compared to earlier centuries.\",\"PeriodicalId\":331017,\"journal\":{\"name\":\"Proceedings OCEANS\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1989-09-18\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Proceedings OCEANS\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/OCEANS.1989.592878\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings OCEANS","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/OCEANS.1989.592878","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Long Environmental Records Derived From Tree-ring Sequence In Washington And Northern Oregon
Tree-growth records provide an important source of proxy climatic data for evaluating the uniqueness of 20th-century climates in the Pacific Northwest. Reconstructions of mean annual temperature from upper treeline sites show a prolonged temperature increase during the 20th-century that exceeded the magnitude and duration of any warm period over the past four centuries. Growth of low to mid-elevation continuous forests of western Washington increase during the 20th-century, suggesting an amelioration of climatic limitations. In contrast, tree growth reached minimum values during the 20th-century at drought-sensitive, forest-grassland borders east of the Cascade Mountains. Precipitation reconstructions based on lower treeline sites show severe droughts during 20th-century, but no longterm change in mean precipitation compared to earlier centuries.