Late spring soil moisture variation over the Tibetan Plateau and its influences on the plateau summer monsoon

Zhou, Juan; Wen, Jun; Liu, Rong; Wang, Xin; Xie, Yan

doi:10.1002/joc.5723

Cited by 14 publications

(14 citation statements)

References 26 publications

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“…The proposed mechanism may be attributed to multiple processes and may not only depend on soil moisture; however, further studies with model experiments will better delineate the underlying mechanism. In a previous study, similar local feedback between soil moisture precipitation is reported with a strong correlation between eastern plateau spring soil moisture and TP monsoon precipitation involving a similar mechanism observed in the current study (Zhou et al 2018).…”

Section: Summary and Discussionsupporting

confidence: 91%

“…The latent heat of condensation over eastern TP enhances the diabatic heating and leads to strong vertical ascending motion (Anmin et al 2012;Zhang et al 2016;Zhou et al 2018). In spring, TP's energy pro le can be largely attributed to soil moisture anomalies; thus, the energy released may also be subjected to soil moisture, which resulted from winter snow cover and springtime precipitation.…”

Section: Summary and Discussionmentioning

confidence: 99%

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The Empirical Influences of Tibetan Plateau Soil Moisture on South Asian Monsoon Onset

Lou¹,

Wang²,

Ullah³

et al. 2021

Preprint

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The South Asian High (SAH) location and intensity are linked with the Tibetan Plateau (TP) and Yangtze River basin latent heating. The existing feedbacks of SAH variability is rarely linked with TP soil moisture regulated energy fluxes. In this study, remotely sensed soil moisture and global atmospheric reanalysis products are used to quantify the relationship between the TP spring (April, May, June) soil moisture with SAH and South Asian (SA) monsoon onset during 1988–2008. The diagnostic analysis infers that the SAH exhibits a significant correlation (R ≥ 0.90) with TP spring soil moisture and monsoon onset indices (R≥ -0.56−-0.61). During the early and late monsoon onset, a significant anomalous soil moisture regime influenced the surface energy fluxes, which affected the vertical diabatic heating profile. The diabatic heating profile affects the TP ascending motion and SAH intensity, which leads to regional monsoon circulation changes and onset. An asymmetric SAH movement in the upper troposphere appears before the early and late monsoon onset composites and drives the lower tropospheric westerlies/easterlies winds towards the continental SA. The wind shear and transition from prevailing easterlies into westerlies during the pre-onset, onset, and post-onset pentad results in strong/weak ascent in the Bay of Bengal and advances into continental regions. The onset- mechanism further suggested intensified/weaker westerlies/easterlies during early/late onset composites. The SAH intensity and movement are linked with TP soil moisture, which exhibits teleconnections with the regional circulation pattern. A detailed model experiment will be conducted to verify the influence of soil moisture as a driver of energy fluxes and SA monsoon onset.

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Section: Summary and Discussionsupporting

confidence: 91%

Section: Summary and Discussionmentioning

confidence: 99%

The Empirical Influences of Tibetan Plateau Soil Moisture on South Asian Monsoon Onset

Lou¹,

Wang²,

Ullah³

et al. 2021

Preprint

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“…The East Asian summer monsoon (EASM) is significantly related to the land‐ocean temperature gradients between the continental East Asia and neighbouring oceans (Zhang et al ., 2013; Liu et al ., 2017). The temperature gradients prior to the onset of monsoons can be modulated by warming or cooling of the continental East Asia, which is related to the pre‐monsoonal soil moisture variability via surface energy budget (Koster and Suarez, 2001; Douville, 2002; Alexander, 2011; Dirmeyer, 2011; Asharaf et al ., 2012; Li et al ., 2015; Berg et al ., 2017; Varikoden and Revadekar, 2018; Wang et al ., 2018; Zhong et al ., 2018; Zhou et al ., 2018). Using observational analyses and numerical simulations, previous studies suggested that wet soil in spring over the vast region from the lower and middle reaches of the Yangtze River valley to North China (YRNC) corresponds to a cooling land surface in May, resulting in a reduced land‐sea thermal contrast and thereby a weakened EASM (Zhang and Zuo, 2011; Zuo and Zhang, 2016).…”

Section: Introductionmentioning

confidence: 99%

Role of May surface temperature over eastern China in East Asian summer monsoon circulation and precipitation

Zhou

Zuo

Rong

et al. 2020

Intl Journal of Climatology

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Spring soil moisture over the vast region from the lower and middle reaches of the Yangtze River valley to North China (YRNC) can significantly influence East Asian summer monsoon (EASM) via May surface temperature. This study further validates the role of May surface temperature in linking spring soil moisture with summer monsoon circulation and rainfall over eastern China. The role of May surface temperature over YRNC in the ensuing EASM and precipitation over eastern China are investigated by observational analyses and numerical simulations. Given the long "memory" of soil temperature (ST) and its highly consistent with surface temperature, experiments are performed by altering ST as a substitution. The results show that YRNC spring surface temperature anomalies have a significant influence on EASM and precipitation over eastern China. The negative May ST anomalies correspond to an abnormal cooling in the surface and tropospheric atmosphere around the YRNC, which narrows the land-ocean thermal contrast, resulting in a weakened EASM. An anomalous anticyclone extends from southeastern China to the Philippine Islands, and an anomalous cyclone occupies northeastern China. Consequently, rainfall anomalously decreases over southeastern China and increases over northeastern China. The convergence of warm and humid southerly airflows and cold northerly winds conduces to an enhanced rainfall around the Yangtze River valley. The opposite occurs for the positive ST anomalies. Further simulations show that abnormal wet (dry) spring soil can lead to negative (positive) ST and surface temperature anomalies in May over the YRNC. Hence, the surface air temperature in May is the bridge for the effect of the YRNC spring soil moisture on the EASM and precipitation over eastern China.

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“…The response of soil organisms to short-term favorable conditions, following thawing and snowmelt, was immediate and short-lived [109], and the annual mean values of precipitation and temperature were not as representative as we expected. Second, Zhou et al [123] found that the variation in soil moisture on the Tibetan Plateau was non-uniform, and that geographic position and the summer monsoon, together, affected the relationship between precipitation and soil moisture. The heterogeneity of this relationship made the correlation between soil nematodes and climatic factors no longer general at the large scale.…”

Section: Roles Of Biotic and Abiotic Factors In Relation To The Nematode Communitymentioning

confidence: 99%

Large-Scale Patterns of Soil Nematodes across Grasslands on the Tibetan Plateau: Relationships with Climate, Soil and Plants

Chen

Luo

et al. 2021

Diversity

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Soil nematodes are important contributors to soil biodiversity. Nonetheless, the distribution patterns and environmental drivers of soil nematode communities are poorly understood, especially at the large scale, where multiple environmental variables covary. We collected 520 soil samples from 104 sites representing alpine meadow and steppe ecosystems. First, we explored the soil nematode community characteristics and compared community patterns between the ecosystems. Then, we examined the contributions of aboveground and belowground factors on these patterns. The genus richness and abundance of nematodes on the Tibetan Plateau are lower than other alpine ecosystems, but are comparable to desert or polar ecosystems. Alpine meadows supported a higher nematode abundance and genus richness than alpine steppes; bacterial-based energy channels were pre-dominant in both the ecosystems. Soil factors explained the most variation in the soil nematode community composition in the alpine meadows, while plant factors were as essential as soil factors in the alpine steppes. Unexpectedly, the climate variables barely impacted the nematode communities. This is the first study to explore the spatial patterns of soil nematode compositions on the Tibetan Plateau, and we found that the contributions of climate, plants, and soil properties on soil nematodes community were essentially different from the previous knowledge for well-studied plant and animal communities.

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Late spring soil moisture variation over the Tibetan Plateau and its influences on the plateau summer monsoon

Cited by 14 publications

References 26 publications

The Empirical Influences of Tibetan Plateau Soil Moisture on South Asian Monsoon Onset

The Empirical Influences of Tibetan Plateau Soil Moisture on South Asian Monsoon Onset

Role of May surface temperature over eastern China in East Asian summer monsoon circulation and precipitation

Large-Scale Patterns of Soil Nematodes across Grasslands on the Tibetan Plateau: Relationships with Climate, Soil and Plants

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