CAJ | 학술논문

利用北京325 m气象塔47 m高度上2006年全年连续观测获得的湍流资料,分析了北京城市近地层动量通量、感热通量、潜热通量和CO_2通量的典型日变化、月平均日变化和季节变化特征.分析结果显示:动量通量具有明显的单波峰日变化特征,在15时(北京时间)左右达到最大,季节变化中春季最大,冬季次之,夏、秋季最小;感热通量和潜热通量全年变化范围分别为-92～389 W·m~（-2）和-75～376 W·m~(-2),其日变化也表现为单波峰特征.感热通量的日变化受城市下垫面和人为热源影响,入夜后虽然降为负值,但只略小于0.阴雨天感热通量和潜热通量均很小,降雨前后有明显区别.感热和潜热最大值分别在春季3月和夏季6月,最小值都在冬季1月;城市下垫面CO_2通量总表现为正值,即净排放,最大值为3.88 mg·m~(-2)·s~(-1),不稳定情况下最小值小于-2 mg·m~(-2)·s~(-1).受到人类活动的影响,CO_2通量的日变化特征在工作日与周末有明显区别;由于冬季采暖,CO_2通量明显大于夏季;在夜间,CO_2通量受进城车辆的影响也出现高值.
이용북경325 m기상탑47 m고도상2006년전년련속관측획득적단류자료,분석료북경성시근지층동량통량、감열통량、잠열통량화CO_2통량적전형일변화、월평균일변화화계절변화특정.분석결과현시:동량통량구유명현적단파봉일변화특정,재15시(북경시간)좌우체도최대,계절변화중춘계최대,동계차지,하、추계최소;감열통량화잠열통량전년변화범위분별위-92～389 W·m~（-2）화-75～376 W·m~(-2),기일변화야표현위단파봉특정.감열통량적일변화수성시하점면화인위열원영향,입야후수연강위부치,단지략소우0.음우천감열통량화잠열통량균흔소,강우전후유명현구별.감열화잠열최대치분별재춘계3월화하계6월,최소치도재동계1월;성시하점면CO_2통량총표현위정치,즉정배방,최대치위3.88 mg·m~(-2)·s~(-1),불은정정황하최소치소우-2 mg·m~(-2)·s~(-1).수도인류활동적영향,CO_2통량적일변화특정재공작일여주말유명현구별;유우동계채난,CO_2통량명현대우하계;재야간,CO_2통량수진성차량적영향야출현고치.
Diurnal and seasonal variations of turbulence and carbon dioxide flux were investigated based on one year continuous measurements at the height of 47 m on Beijing 325-m meteorological tower. Results showed that the momentum fluxes had a typical diurnal variation characteristic with a single peak in the afternoon around 1500 LST. The momentum fluxes were the largest in spring, followed by winter, then suer and autumn. The sensible and latent heat fluxes throughout a year ranged between -92-389 W·m~(-2) and -75-376 W·m~(-2),respectively. Typical diurnal variation could be observed obviously in sunny days with a single peak. The sensible heat fluxes usually reduced to a value slightly below zero at night due to the heat released by human. Both of the sensible and latent heat fluxes were small during rainy days and there were clear differences before and after the rain. The maximums of sensible and latent heat fluxes were observed in March and June respectively, with the minimum in January for both. The CO_2 flux was mainly positive throughout the year, with the maximum of 3.88 mg·m~(-2)·s~(-1) and the minimum of less than -2 mg·m~(-2)·s~(-1) in unstable conditions. The diurnal variation characteristics of CO_2 flux were influenced by human activities. There were obvious differences between weekdays and weekends. Because of human heating, CO_2 flux was larger in winter than in other seasons. Peaks of CO_2 flux were also observed during the midnight because of the trucks transporting to Beijing.