水科学进展2011，Vol.22Issue(6)：844-850,7.DOI:32.1309.P.20111125.1636.010
太湖水体水温垂向分层特征及其影响因素
Thermal stratification and its influence factors in a large-sized and shallow Lake Taihu
摘要
Abstract
Thermal stratification is an important factor controlling nutrient cycling and phytoplanton production in the aquatic ecosystem. To highlight the stratification characteristic of water temperature and its influence factors in large-sized and shallow lakes, the annual variation of stratification of water temperature was investigated in Lake Taihu using the thermal chain. The analysis of 6-layer water temperature data at the 2. 5-m water depth shows that the vertical difference of water temperature in Lake Taihu is generally ranged between 0 and 11 , but short-term ones also could reach high values between 1 and 4X. ,even over 4t under the extreme condition. Furthermore, the vertical temperature difference in Lake Taihu varies with seasons, months and days, and the corresponding thermocline depth also changes. The many factors such as solar radiation, air temperature, wind speed, water density, specific heat and cya-nobacterial bloom and others impact on thermal stratification. With the increase of solar radiation intensity, the vertical profile of water temperature rises at first and then dips. The maximum temperature appears when the peak solar radiation value of about 700 W/m2 occurs. The thermal stratification weakens as the wind speed increases. However, the stratification will be stabilized when the wind speed exceeds a threshold value of 4m/s. This is especially true in summer and autumn seasons. The quicker the change in air temperature is, the larger the difference in water temperature. The inversion layer may occur during cold winder seasons due to the variation of water density and specific heat. The period of strongest stratification occurs in summer due to cyanobacterial blooms. The study indicates that transient thermal stratification can be found in a large-sized shallow lake that is subjected to frequent hydrodynamic disturbances. The stratification characteristics of water temperature are affected by meteorological conditions. The study provides insight into the internal nutrient release process and highlights the mechanism in cyanobacterial blooms. It also provides valuable information for creating the lake ecological model.关键词
浅水湖泊/水温分层/太阳辐射/气温/风浪扰动/蓝藻水华Key words
shallow lake/ thermal stratification/ solar radiation/ air temperature/ wave disturbance/ cyanobacterial bloom分类
天文与地球科学引用本文复制引用
赵林林,朱广伟,陈元芳,李未,朱梦圆,姚昕,蔡琳琳..太湖水体水温垂向分层特征及其影响因素[J].水科学进展,2011,22(6):844-850,7.基金项目
国家重点基础研究发展计划(973计划)资助项目(2008CB418103) （973计划）
国家自然科学基金资助项目(40730529) （40730529）
