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|Title: ||探討海平面溫度對中美洲巴拿馬地區 降雨與森林物候之非線性與非穩態性影響;Exploring the Non-linear and Non-stationary Effects of Sea Surface Temperature on Regional Precipitation and Forest Phenology in Panama|
|Authors: ||柯明格;Vasquez,Miguel Conrado Valdez|
|Keywords: ||海平面溫度;降雨;森林物候;遙相關;Sea Surface Temperature;Precipitation;Forest Phenology;Teleconnection|
|Issue Date: ||2015-09-23 10:12:12 (UTC+8)|
;The inherent effects of global Sea Surface Temperature (SST) anomalies on hydrological cycle and vegetation cover complicate the structure of tropical climate at the regional scale. Assessing hydrological processes related to climate forcing is important in Central America because it is surrounded by both the Pacific and Atlantic oceans and two continental landmasses. In this study, the use of high-resolution remote sensing imagery and wavelet analysis helps identify nonstationary characteristics of hydrological and ecological responses. The study is conducted in two different time frames, 10 years and 30 years. In this study, a series of non-stationary and non-linear leading and non-leading teleconnection signals are identified between SST at the Atlantic and Pacific oceans and the Enhanced Vegetation Index (EVI) and precipitation in the La Amistad international Park at Panama, Central America. The site was selected to avoid anthropogenic influences that could mask climate teleconnection signals. Linear teleconnection patterns across anomalous datasets found significant correlation regions between SST and the terrestrial sites. Biennial and triennial Non-stationary signals are also exhibited between terrestrial responses and SST anomalies across ocean regions related with the El Niño Southern Oscillation (ENSO), North Atlantic Oscillation (NAO) signals as well as constant low frequency signals, which may coincide with the seasonality changes.
The Wavelet-based Empirical Orthogonal Function (WEOF) further reflects the nonlinear relationship between the Atlantic and Pacific SST and the greenness of a pristine forested site in Panama, La Amistad International Park.
The results of our remote sensing based wavelet analysis showed intra-annual high-frequency and biennial to triennial low-frequency signals between EVI/precipitation datasets and SST indices in both Atlantic and Pacific oceans. A spatiotemporal priority search further confirmed the importance of the effects of the ENSO over terrestrial responses in the selected study site. In addition, a series of potential non-leading teleconnection patterns were identified in the Pacific ocean.
Coincidence of the effect of ENSO teleconnection patterns on precipitation and vegetation suggests possible impacts of El Niño-associated droughts in Central America, accompanied by reduced rainfall, specifically during the first months of rainy season, and decline in vegetation cover during the dry season. In addition, this identified long-term teleconnection signals can aid for understanding the climate change impacts at local scales, and can aid to forecast precipitation by establishing a relationship in the information identified.
|Appears in Collections:||[土木工程研究所] 博碩士論文|
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