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Peng Zhang,정지훈,Hans W. Linderholm,정지윤,Riikka Salo,김백민,김민석 한국기상학회 2019 Asia-Pacific Journal of Atmospheric Sciences Vol.55 No.3
Annual rings from trees have been used to infer past climate variability beyond the observational records. Here, we assess if two conifer species from the humid subtropical island of Jeju, South Korea, can be used as proxies for past regional climate variability and large-scale ocean current variability, such as the Kuroshio Current, over the Western North Pacific. Korean red pine (Pinus densiflora) and Korean fir (Abies koreana) were sampled close to their altitudinal limits of distribution on the southern slopes of the volcano Mt. Halla at 1320 m and 1640 m a.s.l., respectively. Comparison with climate variables from nearby meteorological stations indicated a significant positive association between temperature in January/April and Korean red pine growth, which suggests that the red pine can be used to reconstruct mid-winter/spring temperatures back in time. Positive correlations were also found between the tree-ring growth and October (for Korean fir) and January (for Korean red pine) precipitation. Moreover, pine tree growth showed significant multi-month associations with sea surface temperatures over the Western North Pacific and variability of the Kuroshio Extension. The results suggest that subtropical trees from South Korea can be used as indicators of past climate variability on local to regional scales, and possibly also to infer the past variability of the Kuroshio Current in the Western North Pacific.
Impact of urban warming on earlier spring flowering in Korea
Jeong, Jee‐,Hoon,Ho, Chang‐,Hoi,Linderholm, Hans W.,Jeong, Su‐,Jong,Chen, Deliang,Choi, Yong‐,Sang John Wiley Sons, Ltd. 2011 International journal of climatology Vol.31 No.10
<P><B>Abstract</B></P><P>Using long‐term (1954–2004) observations of four selected species in South Korea: goldenbell (<I>Forsythia koreana</I>), azalea (<I>Rhododendron mucronulatum</I>), cherry (<I>Prunus yedoensis</I>), and peach (<I>Prunus persica</I>), the impact of urban warming on spring flowering was investigated. Trends of early spring temperatures and first‐flowering dates (FFDs) of the four plants were cross‐compared among nine differently urbanized cities. It was clearly observed that urban warming has led to an advance in the timing of first‐flowering of several days to weeks during recent decades, while the intrinsic physiology of plants to sense thermal energy has not been changed. The degree of advancement of the FFD was observed to be roughly proportional to degree of urbanization. Moreover, the sensitivity of the FFD to urban warming was estimated to be higher for the shrub species (−9.07 and −6.64 days °C<SUP>−1</SUP> for goldenbell and azalea, respectively) than the tree species (−2.46 and −2.90 days °C<SUP>−1</SUP> for peach and cherry, respectively). Our results suggest that the impact of urban warming should be considered as an influential factor which drives changes in the regional natural environment, especially in regions of rapid urbanization. Copyright © 2010 Royal Meteorological Society</P>