排序方式: 共有1条查询结果,搜索用时 15 毫秒
1
1.
Climatic signals in beech tree-ring width series from Central Italy have been studied over different periods of time. Prewhitened
tree-ring chronologies respond mainly to summer precipitation and they do not correlate in a significant manner with the winter
North Atlantic oscillation (NAO) index. In this high-frequency pattern the NAO signs are only found on a small number of rings
characterized by being very narrow or wide. By contrast, tree-ring width chronologies in which all the frequency components
are conserved were significantly related to the NAO. The significant inverse correlation between actual measurements of ring
width and NAO is a consequence of the availability of water in the soil at the beginning of the growing season. In fact, in
the Mediterranean area the recharging of soil moisture depends on the amount of winter precipitation, which is inversely correlated
with the NAO. Strong signals of winter precipitation and NAO are found in the low-frequency components of tree-ring growth.
Received: 18 March 1999 / Revised: 29 February 2000 / Accepted: 1 March 2000 相似文献
1