Dust Activities Induced by Nocturnal Low‐Level Jet Over the Taklimakan Desert From WRF‐Chem Simulation

Han, Zihang; Ge, Jinming; Chen, Xingyu; Hu, Xiaobin; Yang, Xuan; Du, Jiajing

doi:10.1029/2021jd036114

Cited by 6 publications

(6 citation statements)

References 91 publications

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“…Xiao, Zhou, and Liao [37] suggested that strong winds are the direct cause of dust storms in the Taklimakan region, based on site observation data. Additionally, if the surface sensible heat flux increases, the near-surface air temperature rises, which increases the near-surface turbulence and makes the air instability increase, which is conducive to the strengthening and persistence of dust weather [46,47,72,73]. In this study, we examined three primary factors influencing dust emission and investigated the differences between the SDAP and SDIP (Figure 5).…”

Section: Near-surface Meteorological Factorsmentioning

confidence: 99%

“…Additionally, anomalous largescale environment conditions related to the Arctic Oscillation (AO) and El Nino-Southern Oscillation (ENSO) can create favorable conditions for the enhanced dust activities in Asia [42][43][44][45]. However, the regulation of summer dust activity in the TD by large-scale circulation has received less attention, apart from the contribution of momentum transfer of the nocturnal low-level jet [46,47].…”

Section: Introductionmentioning

confidence: 99%

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Summer Extreme Dust Activity in the Taklimakan Desert Regulated by the South Asian High

Wang

Han

et al. 2023

Remote Sensing

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Summer dust aerosol in the Taklimakan Desert (TD) affects not only the albedo of the snow and ice sheets on the Tibetan Plateau (TP) but also air quality and precipitation in the downstream areas. In this study, the summer extreme dust activity in the TD was jointly investigated by using satellite observations and MERRA-2 reanalysis datasets and divided into two states: dust active period and dust inactive period. The horizontal and vertical distribution of summer dust during both the dust active and inactive periods, as derived from the MERRA-2 dataset, is consistent with satellite observations. By comparing the upper-level circulation and surface meteorological elements at two periods, we identify the South Asian High (SAH) as the dominant factor driving the extreme dust activity in the TD during summer. When the SAH is centered on the Iranian Plateau (IP), the dust aerosol in the TD exhibits increased activity and is lifted to higher altitudes due to significantly enhanced westerly winds, near-surface wind speed, and an ascending motion. Conversely, when the SAH is centered on the TP, the summer dust activity shows the opposite behavior. These new findings on the regulatory mechanism of the SAH on the summer dust activity in the TD are highly significant for understanding the occurrence and transport of summer Asian dust and its potential impact on heavy precipitation in the downstream areas.

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Section: Near-surface Meteorological Factorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Summer Extreme Dust Activity in the Taklimakan Desert Regulated by the South Asian High

Wang

Han

et al. 2023

Remote Sensing

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“…In similar respects, Cheng et al (2022) simulated the role of topography driving low-level wind convergence, and thereby enhancing heat fluxes and convection. Atmospheric transport and coupling to surface and hydrological processes also played a role in dust transport and emission (Han et al, 2022) and influencing stream outflow (Getirana et al, 2021).…”

Section: A Scale For All Silosmentioning

confidence: 99%

Scaling Land‐Atmosphere Interactions: Special or Fundamental?

et al. 2022

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Viewed from billions of kilometers away in space, Earth appears as a single "Pale Blue Dot," in the immortalized phrase of Carl Sagan bestowed upon the image taken by the Voyager 1 space probe. Coming closer, though, a sharper image emerges (Figure 1).One finds structure to that dot, shades of green and brown continents, a dark ocean, a bright cryosphere, and a hazy, thin blue atmosphere. Zooming further in, those components break into patterns of mountains and rivers, seas and bays, forests and grasslands, layers, and cloud decks. And getting closer, one finds each component has oscillations and variations of branches and rivulets, canyons and plateaus, currents and coastlines. These objects keep revealing more structure in finer, often self-similar form, like Mandelbrot's fractals, down to eddies and organisms, and further into leaves, cells, enzymes, molecules, and atoms.And then, if you wait seconds, days, decades, or eons, landscape patterns change. Bigger things typically take longer than smaller ones. As a result, the pattern changes-sometimes occurring slowly and subtly, ebbing and flowing in an oscillatory manner, or they can occur quickly and abruptly, morphing into a new state of order.Each element and its dynamics come with variations in space and time that can be encompassed by the concept of scale. Earth systems science is preoccupied with the interactions of these elements, which cannot be understood without a stipulation of the scales of interest (Ge et al., 2019). The most straightforward of these interactions are ones where common processes at all scales can be defined by a single relationship, often a power-law, leading to the concept of scale invariance (Paleri et al., 2022). The most interesting interactions are the ones that break those rules and lead to "upscale" and "downscale" behavior, whereby processes at one scale determine the shape and function of another scale. These are most common at the intersections of biology, hydrology, geology, and meteorology, often within what is termed the "critical zone." This interlocking also harkens to the origins of

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“…LLJs in hot desert areas are usually NLLJs, although a fraction of the LLJs are connected to convective cold pools (Heinold et al, 2013). LLJs in hot deserts have strong implications for forming dust storms (Fiedler et al, 2013;Z. Han et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

“…LLJs in hot desert areas are usually NLLJs, although a fraction of the LLJs are connected to convective cold pools (Heinold et al., 2013). LLJs in hot deserts have strong implications for forming dust storms (Fiedler et al., 2013; Z. Han et al., 2022). Likewise, LLJs happening in continental polar regions (PLLJs), or cold deserts, are generated by the stabilization of the atmospheric boundary layer via near‐surface cooling or warm air advection (Heinemann & Zentek, 2021).…”

Section: Introductionmentioning

confidence: 99%

Global Climatology of Low‐Level‐Jets: Occurrence, Characteristics, and Meteorological Drivers

Luiz,

Fiedler

2024

JGR Atmospheres

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Low‐level jets (LLJs), vertical profiles with a wind speed maxima in the lowest hundred meters of the troposphere, have multiple impacts in the Earth system, but a global present‐day climatology based on contemporary data does not exist. We use the spatially and temporally complete data set from ERA5 reanalysis to compile a global climatology of LLJs for studying the formation mechanisms, characteristics, and trends during the period of 1992–2021. In the global mean, LLJs are detected 21% of the time with more cases over land (32%) than over the ocean (15%). We classified the LLJs into three categories: non‐polar land (LLLJ), polar land (PLLJ), and coastal (CLLJ) LLJs. For LLLJ, the averaged frequency of occurrence is 20% and 75% of them are associated with a near‐surface temperature inversion as a prerequisite for an inertial oscillation. PLLJs are also associated with a temperature inversion and occur even more frequently with 59% of the time. These are also the lowest and the strongest LLJs among the three categories. CLLJs are particularly frequent in some marine hotspots, situated along the west coast of continents, with neutral to unstable stratification close to the surfaces and a stably stratified layer aloft. We found distinct regional trends in both the frequency and intensity of LLJs over the past decades, which can have implications for the emission and transport of aerosols, and the transport of atmospheric moisture. Future studies could address changes in LLJs and the associated implications in more detail, based on the here released ERA5‐based LLJ data.

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Dust Activities Induced by Nocturnal Low‐Level Jet Over the Taklimakan Desert From WRF‐Chem Simulation

Cited by 6 publications

References 91 publications

Summer Extreme Dust Activity in the Taklimakan Desert Regulated by the South Asian High

Summer Extreme Dust Activity in the Taklimakan Desert Regulated by the South Asian High

Scaling Land‐Atmosphere Interactions: Special or Fundamental?

Global Climatology of Low‐Level‐Jets: Occurrence, Characteristics, and Meteorological Drivers

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