Understanding the impact of changes in climatic variables on reference evapotranspiration (ET_o) is important for predicting possible implications of climate change on the overall hydrology of an area. This study aimed to determine the effects of changes in ET_o with respect to changes in climatic variables. In addition, the specific objective was to determine the sensitivity coefficients of ET_o in seven different locations in Nigeria with distinct agroecology, namely Maiduguri (Sahel savannah), Sokoto (Sudan savannah), Kaduna (Guinea savannah), Jos (Montane), Enugu (Derived Savannah), Ibadan (tropical rainforest), and Port Harcourt (coastal). The results showed that ET_o is most sensitive to changes in maximum temperature (T_max) in Maiduguri, Sokoto, Kaduna, and Jos. In Enugu and Ibadan, ET_o is most sensitive to changes in solar radiation (R_s), while in Port Harcourt, ET_o is most sensitive to relative humidity (RH). Overall, based on the average annual sensitivity coefficients (SCs) of the study area, the SC is ranked in the order: RH > R_s > T_max > U₂ > T_min. Also, the results showed positive SCs of ET_o to R_s, T_max, U₂, T_min, and negative SC for RH. This study can serve as a baseline for sustainable water management in the context of climate change and adapted to areas with a similar climate.

了解气候变量的变化对参考蒸散量（ET _o）的影响，对于预测气候变化对某个地区整体水文学的可能影响至关重要。这项研究旨在确定ET _o变化对气候变量变化的影响。此外，具体目标是确定尼日利亚七个具有不同农业生态特征的不同地区的ET _o敏感性系数，分别是迈杜古里（Sahel savannah），索科托（苏丹savannah），卡杜纳（Guinea savannah），乔斯（Montane），埃努古（Enugu） （衍生自萨凡纳），伊巴丹（热带雨林）和哈科特港（沿海）。结果表明，ET _o对最高温度的变化最敏感（在迈杜古里（Maduguri），索科托（Sokoto），卡杜纳（Kaduna）和乔斯（Jos。）的T _max），ET _o对太阳辐射的变化（R _s）最敏感，而在Harcourt港，ET _o对相对湿度（RH）最为敏感。总体而言，根据研究区域的年平均灵敏度系数（SCs），SC的排列顺序为：RH> R _s > T _max > U ₂ > T _min。此外，结果显示ET _o相对于R _s，T _max，U ₂，T的正SC_min，RH的负SC。这项研究可以作为气候变化背景下可持续水资源管理的基准，并适用于气候相似的地区。