Characteristics and Numerical Simulations of Extremely Large Atmospheric Boundary-layer Heights over an Arid Region in North-west China

Ma, Ming; Pu, Zhaoxia; Wang, Shigong; Zhang, Qiang

doi:10.1007/s10546-011-9608-2

Cited by 31 publications

(19 citation statements)

References 27 publications

(28 reference statements)

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“…For the vegetated land surface, the model response in ABL height to initial soil moisture is larger than for bare soil. At lower soil saturation (S w = 0.2), the simulated maximum ABL height for bare-soil/vegetation is approximately around 3/4 km for both models, typical for arid regions [33,34]. The higher ABL heights for vegetated surface results from its lower albedo, as explained earlier.…”

Section: Abl Quantitiesmentioning

confidence: 50%

Modeled Land Atmosphere Coupling Response to Soil Moisture Changes with Different Generations of Land Surface Models

Shrestha

Simmer

2019

Water

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An idealized study with two land surface models (LSMs): TERRA-Multi Layer (TERRA-ML) and Community Land Model (CLM) alternatively coupled to the same atmospheric model COSMO (Consortium for Small-Scale Modeling), reveals differences in the response of the LSMs to initial soil moisture. The bulk parameterization of evapotranspiration pathways, which depends on the integrated soil moisture of active layers rather than on each discrete layer, results in a weaker response of the surface energy flux partitioning to changes in soil moisture for TERRA-ML, as compared to CLM. The difference in the resulting surface energy flux partitioning also significantly affects the model response in terms of the state of the atmospheric boundary layer. For vegetated land surfaces, both models behave quite differently for drier regimes. However, deeper reaching root fractions in CLM align both model responses with each other. In general, differences in the parameterization of the available root zone soil moisture, evapotranspiration pathways, and the soil-vegetation structure in the two LSMs are mainly responsible for the diverging tendencies of the simulated land atmosphere coupling responses.Water 2020, 12, 46 2 of 16 to different LSMs. In another effort, a multiple combination of LSMs and ABL schemes was used to diagnose the land-atmosphere coupling over the southern great plains (SGP) for dry (<25% volumetric soil moisture) and wet (near saturation) extremes using diurnal scale simulations [5]. They found that CLM generally simulated the evaporative fluxes in wet regimes better, which, however did not translate into better coupling metrics, as the land surface influence is diminished relative to the ABL during wet regimes. In the continuing effort to add more physically based processes, the inclusion of CLM and a 3-D groundwater model led to slight improvements in the simulated diurnal surface fluxes over Western Germany [6]. Further, the inclusion of CLM with a 3-D groundwater model in a regional simulation over Europe attenuated the land-atmosphere coupling for the simulated heat wave of 2003 via controls on the root zone soil moisture [7]. This was also found to have stronger dependence on the uncertainty in representation of sub-surface heterogeneity. In another study, the skills of two different generations of LSMs (coupled to the same atmospheric model) were evaluated using convection-permitting seasonal scale simulations over Western Germany. Although, both configurations systematically underestimated the seasonal average diurnal cycle of evapotranspiration for five stations, the third generation LSM (CLM) with the inclusion of a 3D-groundwater model had a lower bias. However, this study also could not identify any clear change in the spatial and temporal variation of precipitation like the earlier study [4].The studies above demonstrate the importance of sophisticated LSMs in the simulated land atmosphere interactions, although uncertainty persists about their feedbacks on cloud and precipitation. However, the nature and ...

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Section: Abl Quantitiesmentioning

confidence: 50%

Modeled Land Atmosphere Coupling Response to Soil Moisture Changes with Different Generations of Land Surface Models

Shrestha

Simmer

2019

Water

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“…In flat terrain typical ABL, heights are between 1 and 2 km, while the observed ones are mostly between 2 and 3 km above ground, which is typical for mountainous terrain (e.g., Kossmann et al 1998). Ma et al (2011) observed PBL heights exceeding 4 km in May 2000 close to the Tibetian Plateau over Dunhuang in China, which is located about 800 km to the southwest of the study region.…”

Section: Vertical Structure Of the Tropospherementioning

confidence: 77%

Dynamical downscaling with COSMO and COSMO-CLM in the Sino-Mongolian Altai region

Kurzrock¹,

Buerkert

Oyunmunkh

et al. 2016

Meteorol Atmos Phys

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For the first time, regional atmospheric simulations with spatial resolution down to 6 km have been performed in the Sino-Mongolian Altai region using the COSMO weather forecast and regional climate model. Two 5-year periods (1979-1982 and 2008-2012) have been simulated for a first evaluation of the model in this special region. The added value of a dynamical downscaling with the COSMO regional climate model CCLM towards the driving ERA-Interim reanalysis is investigated by comparison with weather station observations. In the mountainous region, the CCLM simulation much better relates to the observed monthly mean 2 m temperature and maximum monthly precipitation sums in summer than ERAInterim. In addition, the intensity distribution of sub-daily precipitation amounts becomes more realistic with increasing altitude. CCLM does, however, overestimate convection in the mountains and accordingly simulates too much precipitation. Moreover, wintertime near-surface temperature inversions are underrated in the southern nearGobi area, which leads to too high 2 m temperatures in that region. To examine the ability of the COSMO model to reproduce the vertical thermodynamic structure of the troposphere, additional simulations with the weather forecast version of COSMO were performed for July 2013 and compared to radiosonde measurements of the WATER-COPE field experiment in this region. The results indicate that the COSMO model is quite capable of qualitatively simulating a range of features of the local tropospheric stratification. Mean differences between observed and simulated dew point and temperature profiles were in the range of only to 1-2°C in the lower troposphere.

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“…It can be seen from Figure 9 that a perfectly mixed ABL existed at the location of the radiosonde radar and the depth of the convective boundary layer was about 2 km. During the observation campaign, the midday ABL at the location of the radiosonde radar could exceed 3 km or even higher (measurements are not shown), which was a result of vigorous turbulent mixing in the Gobi Desert [28]. However, due to the cold-lake effect of Bosten Lake, the lakeshore atmospheric turbulent mixing was inhibited.…”

Section: Gps Sonde Radiosondementioning

confidence: 99%

An Analysis of the Physical Characteristics of the Summer Low Atmosphere in the Gobi Desert Adjacent to Bosten Lake, Xinjiang, China

Sun

Ning

et al. 2018

Advances in Meteorology

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A month-long field observation campaign was conducted, which covered approximately 100 km 2 of the Gobi Desert area on the southeast bank of Bosten Lake during the summer of 2016. The purpose of the study was to examine the physical characteristics of the low atmosphere over land-lake nonuniform underlying surfaces in the Gobi Desert of northwestern China. The results of the statistical analysis showed that, during the observational period, the average daytime surface horizontal thermal gradient reached up to −0.2 ∘ C/km from the lakeshore to southern Gobi Desert area. The near-surface wind field of the 7 km horizontal extent from the lakeshore was dominated by onshore breezes with average peak wind speeds above 5 m/s. In the atmospheric near-surface layer, an isohumidity layer at a height between 10 and 50 m a.g.l. was observed from 11:00 to 18:00 LST. Also, a case study for the atmospheric boundary layer and local circulation analyses was conducted. The onshore breezes were found to play a major role in the vertical structure of the local atmospheric boundary layer. The numerical simulation results indicated that there was an alternating day-night local circulation in the Bosten Lake area.

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Characteristics and Numerical Simulations of Extremely Large Atmospheric Boundary-layer Heights over an Arid Region in North-west China

Cited by 31 publications

References 27 publications

Modeled Land Atmosphere Coupling Response to Soil Moisture Changes with Different Generations of Land Surface Models

Modeled Land Atmosphere Coupling Response to Soil Moisture Changes with Different Generations of Land Surface Models

Dynamical downscaling with COSMO and COSMO-CLM in the Sino-Mongolian Altai region

An Analysis of the Physical Characteristics of the Summer Low Atmosphere in the Gobi Desert Adjacent to Bosten Lake, Xinjiang, China

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