Understanding the Partitioning of the Available Energy over the Semi-Arid Areas of the Loess Plateau, China

Yuan, Guanghui; Zhang, Lei; Liang, Jiening; Cao, Xin; Liu, Hui; Zheng, Yang

doi:10.3390/atmos8050087

Cited by 9 publications

(6 citation statements)

References 41 publications

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“…Observations indicate that occurrence of ExT over India is linked to large-scale atmospheric circulation anomalies and regional-scale land-atmosphere feedback processes arising from soil moisture (SM) variations [16][17][18][19] . In particular, SM revamps the ExT by modulating the surface energy partitioning and evapotranspiration (ET) 13,20,21 . As a crucial component of land-atmosphere coupling processes, SM also acts as temporal storage of atmospheric anomalies [22][23][24][25] .…”

Section: Introductionmentioning

confidence: 99%

Soil moisture revamps the temperature extremes in a warming climate over India

et al. 2023

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Soil moisture (SM) plays a crucial role in altering climate extremes through complex land-atmosphere feedback processes. In the present study, we investigated the impact of SM perturbations on temperature extremes (ExT) over India for the historical period (1951–2010) and future climate projection (2051–2100) under 4 K warming scenario. We note that more than 70% area of the Indian landmass has experienced significant changes in characteristics of ExT due to SM perturbations. In particular, we see larger impact of SM perturbations on ExT over the north-central India (NCI), which is a hotspot of strong SM-temperature coupling. Over NCI, a 20% departure in SM significantly revamps frequency, duration and intensity of ExT by 2–5 events/year, 1-2 days/event and 0.5–2.1 °C, respectively, through modulating surface energy partitioning, evapotranspiration and SM memory. Importantly, the impact of SM perturbations on frequency and duration of ExT events becomes less prominent with intensification of global warming.

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Section: Introductionmentioning

confidence: 99%

Soil moisture revamps the temperature extremes in a warming climate over India

et al. 2023

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“…The distribution of latent heat flux and sensible heat flux can be affected by soil moisture, resulting in an impact on the near‐surface air temperature (Yuan et al., 2017). In the FDHW region, sensible heat flux tended to receive a more significant portion of surface net radiation, while latent heat flux received a relatively smaller portion.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Contributions of Local Land‒Atmosphere Coupling and Mesoscale Atmospheric Circulation to the 2013 Extreme Flash Drought and Heatwave Compound Event Over Southwest China

Fu,

Wang

2023

JGR Atmospheres

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The flash drought and heat wave compound event of the 2013 summer in Southwest China was exceptional, with profound socio‒economic impacts. Existing studies have captured the signal of this compound event; however, its causes are still poorly understood. In this study, we utilized a high‐resolution index to examine the life cycle of this compound event from 1980 to 2020 and quantified the relative contributions of land‒atmosphere coupling and mesoscale atmospheric circulation using the air parcel backward tracking method. It was found that the dry soil caused by the precipitation deficit further inhibited precipitation and caused the soil to become even drier, which then led to the development of the flash drought. The dry soil induced a substantial increase in the land‒atmosphere sensible heat flux and a rise in the near‐surface air temperature. During this process, the strength of land‒atmosphere coupling was 2.5 standard deviations higher than the mean value of the climate, playing an integral role in the near‐surface air temperature increase, accounting for 55.9% of the maximum temperature changes. The mesoscale atmospheric circulation contributed 44.1%, of which horizontal advection accounted for 41.1%, while vertical advection only accounted for 3.0%. The western Pacific subtropical high expanded westward, accompanied by the northward‐moving westerly jet stream, which prevented cold air from accessing the Southwest China, and abnormal subsidence interfered with precipitation formation. Furthermore, the control of an abnormally high‐pressure system over the region led to a decrease in cloud cover, allowing more surface incident solar radiation and contributing to the increase in the near‐surface air temperature.

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“…The net radiation partitioning into sensible and latent heat flux depends on land-use type, of which soil moisture is one important impactor (Yuan et al 2017). Rn was partitioned mostly to sensible heat flux (0.34 on average) during the midday (Table 4).…”

Section: ) Spatial Variations During the Wintertimementioning

confidence: 99%

Surface Turbulent Fluxes during Persistent Cold-Air Pool Events in the Salt Lake Valley, Utah. Part I: Observations

Sun

Holmes

2019

Journal of Applied Meteorology and Climatology

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The land surface is coupled to the atmospheric boundary layer through surface turbulent fluxes. Persistent cold-air pools (PCAPs) form in topographic depressions where cold, dense air fills the valley basin and in the presence of air pollution is accompanied by poor air quality. For the first time, the surface turbulence dataset from seven monitors during the Persistent Cold-Air Pool Study conducted in Salt Lake Valley, Utah (December 2010–February 2011), are analyzed. We found that the surface sensible (H) and latent (LE) heat fluxes were lower during strong PCAP events compared with non-PCAPs. The higher ratio of heat flux to net radiation (H/Rn and LE/Rn) for strong PCAPs compared with weak PCAPs is suspected to be related to the presence of boundary layer clouds, which could enhance the turbulent mixing through cloud top–down mixing. The daily average ground heat flux (G) was a similar order of magnitude to H and LE during wintertime. The highest surface turbulent fluxes and energy balance closure occurred in the stability range of −0.05 < ξ ≤ −0.02, or under slightly unstable conditions, near the neutral stability range. The median surface exchange coefficient (Ch), a crucial parameter to determine surface turbulent fluxes in land surface models, was slightly higher at the bare land site (BL) than the short vegetation sites (PH and CR) in wintertime, suggesting the importance of dynamic land-use information in numerical models.

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Understanding the Partitioning of the Available Energy over the Semi-Arid Areas of the Loess Plateau, China

Cited by 9 publications

References 41 publications

Soil moisture revamps the temperature extremes in a warming climate over India

Soil moisture revamps the temperature extremes in a warming climate over India

Contributions of Local Land‒Atmosphere Coupling and Mesoscale Atmospheric Circulation to the 2013 Extreme Flash Drought and Heatwave Compound Event Over Southwest China

Surface Turbulent Fluxes during Persistent Cold-Air Pool Events in the Salt Lake Valley, Utah. Part I: Observations

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