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首页> 外文期刊>Scientific reports. >Extent of Night Warming and Spatially Heterogeneous Cloudiness Differentiate Temporal Trend of Greenness in Mountainous Tropics in the New Century
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Extent of Night Warming and Spatially Heterogeneous Cloudiness Differentiate Temporal Trend of Greenness in Mountainous Tropics in the New Century

机译：夜间变暖的程度和空间异质浑浊区分新世纪山热带山区绿色的时间趋势

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Tropical forests have essential functions in global C dynamics but vulnerable to changes in land cover land use (LCLUC) and climate. The tropics of Caribbean are experiencing warming and drying climate and diverse LCLUC. However, large-scale studies to detect long-term trends of C and mechanisms behind are still rare. Using MODIS Enhanced Vegetation Index (EVI), we investigated greenness trend in the Greater Antilles Caribbean during 2000–2015, and analyzed trend of vegetation patches without LCLUC to give prominence to climate impacts. We hypothesized that night warming and heavy cloudiness would reduce EVI in this mountainous tropical region. Over the 15 years, EVI decreased significantly in Jamaica, Haiti, Dominican Republic, and Puerto Rico, but increased in Cuba partly due to its strong reforestation. Haiti had the largest decreasing trend because of continuous deforestation for charcoals. After LCLUC was excluded, EVI trend still varied greatly, decreasing in the windward but increasing in the leeward of Puerto Rico. Nighttime warming reinforced by spatially heterogeneous cloudiness was found to significantly and negatively correlate with EVI trend, and explained the spatial pattern of the latter. Although cooled daytime and increased rainfall might enhance EVI, nighttime warming dominated the climate impacts and differentiated the EVI trend.
机译：热带森林在全球C动力学中具有重要作用，但易于土地覆盖土地使用（Lcluc）和气候变化。加勒比海的热带氛围正在经历暖和气候和多样化的Lcluc。然而，大规模研究检测C的长期趋势和背后的机制仍然很少见。使用MODIS增强植被指数（EVI），我们在2000 - 2015年期间调查了GREESTILLINGS CARIBBEAN的绿色趋势，并分析了植被斑块的趋势，没有LCLUC突出气候影响。我们假设这种夜间变暖和沉重的浑浊会减少这个山区热带地区的EVI。在15年来，EVI在牙买加，海地，多米尼加共和国和波多黎各减少了大幅下降，但在古巴的重新造林中，古巴均增加。由于持续砍伐特写镜头，海地具有最大的趋势。在Lcluc被排除之后，EVI趋势仍然大大变化，在迎风中减少，但波多黎各的Leeward越来越多。发现通过空间异质浑浊加固的夜间变暖，与EVI趋势显着和负面相关，并解释了后者的空间模式。虽然冷却白天和降雨量增加可能会增强EVI，但夜间变暖占据了气候影响并区分了EVI趋势。

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