干旱区生态环境知识资源中心(Arid): Passive Breathing of Earth-Air: Fingerprint Evidence From Moisture Records

Arid

DOI	10.1029/2021JD036057
	Passive Breathing of Earth-Air: Fingerprint Evidence From Moisture Records
	Li, Hongshou; Wang, Shunren; Li, Fei; Gong, Yipu; Wang, Xiaowei
通讯作者	Li, HS
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
ISSN	2169-897X
EISSN	2169-8996
出版年	2022
卷号	127 期号:10
英文摘要	Earth-air refers to air in the vadose zone. Studies have long suggested that earth-air undergoes a passive breathing effect due to atmospheric pumping. The earth-air can be modeled as an ideal gas in a closed system, so that the volume of earth-air varies as the atmospheric pressure (AP) fluctuates. When AP rises, earth-air is compressed and external air is drawn into the vadose zone. Conversely, when AP drops, earth-air expands and moist earth-air enters the atmosphere. In arid regions, there is a moisture gradient in soil due to dryness of the climate: the humidity is relatively low in the upper soil layer, and relatively high in the subsoil. Therefore, if earth-air undergoes passive breathing, the humidity of earth-air will fluctuate with AP. This means that passive breathing of the earth-air should leave traces in the recorded moisture which exactly match AP fluctuations. In this work, clear evidence is presented for the existence of earth-air passive breathing. This is accomplished by using an innovatively-designed trap to monitor humidity in 30 cm gravelly sand and showing that these moisture/temperature records contain fingerprints which are characteristic of passive breathing. It is found that relative humidity (RH) in soil is negatively correlated with the atmospheric fluctuations. The correlation between 10-min average AP and RH timeseries reaches -0.75 for the time-periods of 20 days. This study provides a new understanding in land-atmosphere heat/mass exchange from the perspective of vertical fluid dynamics.
英文关键词	atmospheric pumping earth-air atmospheric pressure humidity interaction land-atmosphere
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000802022600001
WOS关键词	GAS-TRANSPORT ; ATMOSPHERIC-PRESSURE ; CARBON-DIOXIDE ; SOIL ; PERMEABILITY ; AERATION ; FOREST ; WATER ; CO2 ; CONVECTION
WOS类目	Meteorology & Atmospheric Sciences
WOS研究方向	Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/393457
推荐引用方式 GB/T 7714	Li, Hongshou,Wang, Shunren,Li, Fei,et al. Passive Breathing of Earth-Air: Fingerprint Evidence From Moisture Records[J],2022,127(10).
APA	Li, Hongshou,Wang, Shunren,Li, Fei,Gong, Yipu,&Wang, Xiaowei.(2022).Passive Breathing of Earth-Air: Fingerprint Evidence From Moisture Records.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,127(10).
MLA	Li, Hongshou,et al."Passive Breathing of Earth-Air: Fingerprint Evidence From Moisture Records".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 127.10(2022).