深圳气象梯度观测塔近地层通量数据初步分析

Preliminary Analysis of Near-Surface Flux Data from Meteorological Gradient Observation Tower in Shenzhen

作者：

张春生深圳市国家气候观象台深圳 518040
卢超深圳市国家气候观象台深圳 518040
钟晓勇深圳市国家气候观象台深圳 518040
高瑞泉深圳市气象局深圳 518040
刘爱明深圳市国家气候观象台深圳 518040
古锐昌深圳市国家气候观象台深圳 518040

中文摘要：

涡度相关系统是测量近地面湍流输送通量最普遍的观测仪器，利用2017年9月—2018年2月深圳石岩地区气象梯度塔的涡动通量观测资料，分析了秋冬季节石岩地区近地面动量、感热、潜热和CO2通量结果，得出如下结论：秋季和冬季近地面动量通量日变化非常一致。秋季近地面感热通量小于冬季，但潜热通量远大于冬季，导致总热通量大于冬季，这可能与该地区秋冬季下垫面性质，如土壤湿度等的改变有关。秋、冬季CO2通量日平均为负值，表明该地区为碳汇，秋季CO2负值更强，这可能与秋季植被更茂盛有关。

中文关键词：

涡度相关，湍流通量，梯度塔，地气交换

KeyWords：

eddy covariance, turbulent flux, meteorological gradient observation tower, land-atmosphere exchange

Abstract：

Eddy covariance system is the most common observation instrument for measuring turbulent transport flux near surface. Based on the eddy flux data observed by meteorological gradient pyramid in Shiyan Area of Shenzhen from September 2017 to February 2018, the near-surface momentum, sensible heat, latent heat and CO2 fluxes in autumn and winter are analyzed, and the following conclusions are drawn. The diurnal variation of near-surface momentum fluxes is consistent in autumn and winter. In autumn, the sensible heat flux near surface is less than that in winter, but the latent heat flux is much larger in autumn, which causes the total heat flux to be larger in autumn than in winter. It may be related to the changes of underlying surface property, such as soil moisture. The daily average of CO2 fluxes in autumn and winter is negative, indicating that this area is a carbon sink, and the negative value of CO2 is lower in autumn, which may be related to the flourishing vegetation.