宿迁市高低温发生规律及其与土壤湿度关系研究

Study on the Occurrence Law of High and Low Temperature in Suqian City and Its Relationship with Soil Moisture

摘要: 本文基于2010~2020年站点温度资料，探究宿迁市高低温的变化规律，利用趋势分析的方法，从极端性角度讨论极端高低温的强度、频次的时空分布特征，并探究高低温与土壤湿度的相关关系及其成因。结果表明，1) 2010~2020年宿迁市日最高、最低气温均呈增长趋势，且存在明显的年际变化特征；2) 宿迁、沭阳极端高温强度较强，极端低温强度也较强，气候极端性较好；泗洪、泗阳则反之。沭阳、泗阳极端高低温日数较少；宿迁、泗洪极端高低温日数较多。3) 宿迁市夏(冬)季气温与土壤湿度存在明显负(正)相关关系，当土壤湿度减弱时，蒸发量减少，从而导致感热通量增加，进而导致气温升高。

Abstract: Based on the station temperature data from 2010 to 2020, this paper explores the variation law of high and low temperature in Suqian City, discusses the temporal and spatial distribution charac-teristics of intensity and frequency of extreme high and low temperature from the perspective of extreme nature by using trend analysis, and explores the correlation between high and low temperature and soil moisture and its causes. The results show that 1) From 2010 to 2020, the daily maximum and minimum temperatures in Suqian City showed an increasing trend, and there were obvious interannual variation characteristics. 2) Suqian and Shuyang have strong extreme high temperature intensity, strong extreme low temperature intensity, and good climate extremes; Si-hong and Siyang are the opposite. Shuyang and Siyang have fewer extreme high and low tempera-ture days; Suqian and Sihong have a large number of extreme high and low temperature days. 3) There is an obvious negative (positive) correlation between summer (winter) season temperature and soil moisture in Suqian City, and when soil moisture weakens, the evaporation decreases, re-sulting in an increase in the sensible heat flux, which in turn leads to an increase in temperature.