Department of Physics, São Paulo State University (UNESP), School of Sciences, Bauru, SP, 17033-360, Brazil.
Center of Meteorology (IPMet), São Paulo State University (UNESP), Bauru, SP, 17033-360, Brazil.
Int J Biometeorol. 2019 Nov;63(11):1507-1516. doi: 10.1007/s00484-018-1622-3. Epub 2018 Oct 3.
Brazil is an extensive country with five administrative regions that have different climates, mainly due to their geographic locations. The El Niño-Southern Oscillation influences the regime of temperature and precipitation of the Brazilian regions, which can directly affect the thermal discomfort of the population. The objective of this study was to evaluate the human thermal discomfort index (HDI) in the five regions of Brazil for El Niño, La Niña, and neutral years from 1979 to 2017, as well as the influence of the degree of intensity of the Pacific Ocean anomaly in the thermal conditions of the Brazilian regions. Monthly data on air temperature and dewpoint temperature obtained from the ERA-Interim reanalysis were used. The HDI was calculated using specific equations. The results were analyzed by means of composition fields. From the results, it was possible to conclude that the El Niño and La Niña phenomena influence the HDI of the Brazilian regions. El Niño increases the discomfort due to the heat and the La Niña causes them to decrease. This study is important since these phenomena, by influencing thermal conditions, directly affect the well-being and health of the Brazilian population.
巴西是一个幅员辽阔的国家，分为五个行政区域，由于地理位置的不同，这些地区的气候也存在差异。厄尔尼诺-南方涛动现象会影响巴西各地区的温度和降水模式，这可能会直接影响到当地居民的热舒适度。本研究旨在评估 1979 年至 2017 年间巴西五个地区在厄尔尼诺、拉尼娜和中性年份的人体热舒适度指数（HDI），以及太平洋异常程度对巴西各地区热条件的影响。使用来自 ERA-Interim 再分析的月平均气温和露点温度数据。通过特定的方程计算了 HDI。结果通过组合场进行分析。结果表明，厄尔尼诺和拉尼娜现象会影响巴西各地区的 HDI。厄尔尼诺现象会增加热量引起的不适，而拉尼娜现象则会导致其减少。本研究具有重要意义，因为这些现象通过影响热条件，直接影响到巴西民众的福祉和健康。
