深圳夏季沙面温度变化特征及天气对其影响的分析

利用大运会沙滩排球场馆自动气象站的气温、沙面温度（以下简称沙温）、降水等观测资料，分析了深圳夏季沙温在两类天气（晴天、雨天）条件下的日变化规律，结果表明：1）沙温受云况、降水影响很大，降水除了直接给沙面降温，还影响次日的沙温。2）晴天沙温日变化大，白天的平均沙温呈正弦曲线变化，一天中沙温最高的时段出现在12-14时，最高沙温可达62.9℃；夜间沙温呈现缓慢线性下降，且与气温差逐渐减小，在日出前后达到最低。沙温日最低值一般比日最低气温略高0.2-0.6℃；降水天气时，沙温日较差小，降水时段的初期或雨强突然加大，均能使沙温和气温同步骤降。

An analysis on the variation characteristic of the sand temperature and the influence of weather on it in the summer of Shenzhen

Based on the data of automatic weather station at the Universiade beach volleyball venue,the sand temperature variation characteristic in the summer of Shenzhen was analyzed under two kinds of weathers,namely,sunny day and rainy day.The results show that cloud condition and precipitation have obvious influences on sand temperature.Precipitation can even influence the sand temperature on next day.In sunny days the sand temperature has an obvious diurnal variation,and it shows like sinusoidal in daytime.The sand temperature become highest at 12:00—14:00,the maximum can up to 62.9 ℃ in sunny day,which shows a slow linear decline and reach the lowest value before the sunrise.The minimum sand temperature is about(0.2—0.6) ℃ higher than the minimum air temperature.The magnitude of the sand temperature variation in rainy days is much smaller than that in sunny days,and it would drastically drop at the beginning of precipitation or when the rainfall intensity suddenly increases.