Multi-level CO2 fluxes over Beijing megacity with the eddy covariance method

被引：0
|
作者：
Yang Liu [1 ]
Huizhi Liu [1 ,2 ]
Qun Du [1 ]
Lujun Xu [1 ]
机构：
[1] State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Chinese Academy of Sciences
[2] University of Chinese Academy of Sciences
来源：
Atmospheric and Oceanic Science Letters | 2021年 / 14卷 / 06期
基金：
中国国家自然科学基金;
关键词：
涡动相关; CO2通量; 城市大气边界层; 城市气候;
D O I：
暂无
中图分类号：
TU119.4 []; X16 [环境气象学];
学科分类号：
0706 ; 070602 ; 081304 ;
摘要：
本文基于北京325米气象塔在47,140,和280米三层高度的5年涡动相关观测资料,研究了城市下垫面与大气间的CO2交换过程.由于北京市2011年开始实行工作日汽车尾号限行,140米高度CO2通量的年增长率由2008-2010年的7.8%降低到2010-2012年的2.3%.140米高度通量源区内植被比例最小且人口密度最大,因此140米高度的5年平均CO2通量年总量)6.41 kg C m-2yr-1(大于47米)5.78 kg C m-~2 yr-1(和280米)3.99 kg C m-2yr-1(.在年尺度上,北京汽车总保有量和总人口是最重要的CO2通量控制因子.CO2通量随风向的变化主要与风向对应的通量源区内下垫面土地利用方式有关.三层高度的夏季CO2通量均与道路的比例呈正相关关系.47,140,和280米的决定系数分别为0.69,0.57,和0.54 (P<0.05).植被比例的下降,会导致CO2年总量上升,两者存在近似于指数的关系.城市人口密度的上升会引起CO2年总量上升.
引用
收藏
页码：30 / 34
页数：5
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