气候变化领域集成服务门户(CCPortal): Characterization of the Coherence Between Soil Moisture and Precipitation at Regional Scales

CCPortal

DOI	10.1029/2020JD034340
	Characterization of the Coherence Between Soil Moisture and Precipitation at Regional Scales
	Wu D.; Di C.; Wang T.; Wang L.; Chen X.
发表日期	2021
ISSN	2169897X
卷号	126 期号:8
英文摘要	Knowledge of the interplays between soil moisture (SM) and precipitation (P) across different temporal scales is crucial to understand the land-atmosphere interactions. To examine the factors influencing SM–P coherences, observed long-term SM and P datasets were obtained from two regional networks (i.e., the Nebraska Mesonet and part of the Soil Climate Analysis Network in Utah) within the continental United States. We evaluated the intricate SM–P interactions by checking high- and low-frequency components using wavelet analysis. The analysis revealed that the global coherence coefficients (GCCs) between SM and P at all frequencies tended to be greater under wetter climatic conditions, suggesting that higher P could promote the SM–P interactions. Moreover, GCCs were more correlated with meteorological factors in Nebraska with wetter climates (e.g., positively with mean annual P and negatively with aridity index at high-frequency periodicities (daily to 3 monthly), and opposite interactions at low-frequency periodicities (3 monthly to yearly); whereas, significant correlations emerged between GCCs and soil texture at all frequency periodicities in Utah (e.g., positively with sand fraction while negatively with silt and clay fractions). Part of the reason for the impact of soil texture in Utah was that as the P periodicities weakened with increasing climatic dryness in Utah, soil texture played a more important role in controlling infiltration processes, which directly affected SM–P coherences. Overall, this study demonstrates that SM–P interactions at regional scales were possibly affected by the relative importance of meteorological and local land surface conditions in controlling SM dynamics. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	global coherence coefficient; periodicity; precipitation; soil moisture; soil texture; wavelet analysis
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185282
作者单位	Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin, China; Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim, Tianjin University, Tianjin, China
推荐引用方式 GB/T 7714	Wu D.,Di C.,Wang T.,et al. Characterization of the Coherence Between Soil Moisture and Precipitation at Regional Scales[J],2021,126(8).
APA	Wu D.,Di C.,Wang T.,Wang L.,&Chen X..(2021).Characterization of the Coherence Between Soil Moisture and Precipitation at Regional Scales.Journal of Geophysical Research: Atmospheres,126(8).
MLA	Wu D.,et al."Characterization of the Coherence Between Soil Moisture and Precipitation at Regional Scales".Journal of Geophysical Research: Atmospheres 126.8(2021).