气象条件对滇池水华分布的影响  

Effect of meteorological conditions on blue algal bloom distribution in Dianchi Lake

作　　者：李蒙[1] 谢国清[2] 鲁韦坤[1] 戴丛蕊[1] 

机构地区：[1]云南省气候中心,昆明650034 [2]云南省气象局,昆明650034

出　　处：《气象科学》2011年第5期639-645,共7页Journal of the Meteorological Sciences

基　　金：中国气象局滇池蓝藻监测项目;昆明市环境监测中心滇池蓝藻监测项目

摘　　要：使用MODIS卫星资料,利用假彩色合成法和归一化植被指数法对滇池蓝藻水华进行监测,得到滇池水华的分布特征是:初现于5月,7月最盛,5—10月均有分布,盛时滇池水华分布区域直至南部海口一线。滇池水华分布总体北部最多,湖岸高于中心湖区,西岸高于东岸和南岸。在营养盐条件满足的条件下,高温对水华有促进作用,但不是决定因素。充足的日照是水华形成的必要条件。降水通过改变水温及日照对水华有抑制作用。小风(小于3 m/s)利于水华形成,大风对水华尤其是稀薄水华分布影响较大。气象条件通过相互影响,共同作用对水华产生影响。With the use of MODIS remote sensing image data,the algal bloom in Dianchi Lake is monitored by false colored synthesis and the Normalized Difference Vegetation Index（NDVI） vegetation exponential methods.According to the monitoring,the algal bloom in Dianchi Lake firstly occurred on May 7 and reached the highest point in July.Although in June,August and October it was not so serious,but its distribution was still much higher than in May.The distribution area of the algal bloom extended to Haikou and reached the far south of Dianchi Lake during its active bloom.The bulk algal bloom concentrated in the north and showed a characteristic of a higher distribution near the lake bank than in the center of lake,higher in the west bank than in the east and south banks.In conditions of enough nutrients,a high temperature plays a catalytic role,but it is not the determining factor of the algal bloom.Sufficient sunshine is necessary for the formation of the algal bloom.However,rainfall may change water temperature and sunshine conditions,therefore,it will inhibit the growth of the algal bloom.Gentle breeze（velocity less than 3 m/s） is good for its formation.While strong blast obviously limits the distribution of the algal bloom,especially when it is not so dense one.In short,meteorological conditions through interaction and working together affect the formation of the algal bloom.

关 键 词：卫星遥感 水华特征 气象条件 

分 类 号：P464[天文地球—大气科学及气象学]