Imágenes TRMM para identificar patrones de precipitación e índices ENSO en Ecuador
Imágenes TRMM para identificar patrones de precipitación e índices ENSO en Ecuador
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厄瓜多尔 ENSO 降水和指标的 TRMM 识别图片
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
A. Cueva
中科院分区：
文献类型：
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作者：
Lenin Campozano;D. Ballari;Rolando Célleri;A. Cueva
了解时空降水模式及其与厄尔尼诺/南方涛动的关系，对于预测厄尔尼诺/南方涛动事件的空间影响和发展预警系统十分重要。虽然厄瓜多尔以前曾利用雨量计数据研究过厄尔尼诺/南方涛动现象，但其对降雨空间格局的影响基本上是未知的。因此，本研究的目的是利用热带降雨测量使命任务卫星图像，查明厄瓜多尔受厄尔尼诺/南方涛动影响较大的1月至4月的降水时空格局及其与厄尔尼诺/南方涛动指数的关系。对16 a TRMM遥感图像进行主成分分析，将得分时间序列与Nino 1 + 2区热带太平洋海温（tP SST）以及Trans Nino指数（TNI）进行相关分析。结果表明，TNI和Nino 1 + 2指标均能较好地反映海温对JA季降水的影响。厄尔尼诺1 + 2的强正异常与厄瓜多尔沿海平原的降水量较高和亚马逊地区的降水量低于平均水平呈正相关。TNI的高值与全国降水的增加直接相关。
Understanding spatio-temporal precipitation patterns and how they are related to ENSO are important to predict the spatial impact of ENSO events and develop early warning systems. While ENSO has been previously studied in Ecuador using rain gauge data, its impact on the spatial rainfall pattern is largely unknown. Thus, the purpose of this study was to use the Tropical Rainfall Measuring Mission satellite imagery (TRMM) to identify spatio-temporal patterns of precipitation from January to April, the season more affected by ENSO in Ecuador, and their relation with ENSO indexes. Principal component analysis was applied over the 16-year TRMM imagery, and score time series were correlated with the tropical Pacific surface sea temperature (tP SST) of Nino 1+2 region as well as with the Trans Nino Index (TNI). Results suggest that TNI and Nino 1+2 indicators are both needed to estimate the impact of tP SST on the precipitation during JA season. Strong positive anomalies on Nino 1+2 are positively correlated with higher precipitation in coastal plain of Ecuador and below average precipitation in the Amazon region. High values of TNI are directly related to an enhancement of precipitation all over the country.