Diurnal variations of saltation activity at Tazhong: the hinterland of Taklimakan Desert

Yang, Xinghua; He, Qing; Mamtimin, Ali; Huo, Wen; Liu, Xinchun

doi:10.1007/s00703-012-0227-3

Cited by 20 publications

(9 citation statements)

References 30 publications

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“…In terms of the data source, an uncertainty analysis of five flux observation sites was conducted in the current study (Figure 9a). The Tazhong station had the largest RU, possibly because it was located in an extremely arid area and was greatly influenced by the climate factors such as rainfall and temperature [60], which is important given that the meteorological conditions are the main factors affecting the change in NPP [99][100][101]. When using multiple models, the differences in the structures of the models used in different studies have a certain impact on the estimation of NPP [102,103].…”

Section: Quantifiable Sources Of Uncertaintymentioning

confidence: 99%

Projection of Net Primary Productivity under Global Warming Scenarios of 1.5 °C and 2.0 °C in Northern China Sandy Areas

Huo

Zhao

et al. 2020

Atmosphere

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Empirical evidence suggests that variations in climate affect the net primary productivity (NPP) across sandy areas over time. However, little is known about the relative impacts of climate change on NPP with global warming of 1.5 and 2.0 °C (GW_1.5 °C_2.0 °C) relative to pre-industrial levels. Here, we used a new set of climate simulations from four Inter-Sectoral Impact Model Intercomparison Project (ISI-MIP 2b) datasets, modified the Carnegie-Ames-Stanford approach (CASA) model and assessed the spatio-temporal variation in NPP in sandy areas of northern China (SAONC). Compared with the reference period (RP, 1986–2005), the NPP variation under four emission scenarios showed clear rising trends and increased most significantly under RCP8.5 with an annual average increase of 2.34 g C/m2. The estimated annual NPP under global warming of 1.5 °C (GW_1.5 °C) increased by 14.17, 10.72, 8.57, and 26.68% in different emission scenarios, and under global warming of 2.0 °C (GW_2.0 °C) it increased by 20.87, 24.01, 29.31, and 39.94%, respectively. In terms of seasonal change, the NPP value under the four emission scenarios changed most significantly in the summer relative to RP, exhibiting a growth of 16.48%. Temperature changes (p > 0.614) had a greater impact on NPP growth than precipitation (p > 0.017), but solar radiation showed a certain negative impact in the middle- and low-latitude regions. NPP showed an increasing trend that changed from the southeast to the central and western regions at GW_1.5 to GW_2.0 °C. NPP was consistent with the spatial change in climate factors and had a promoting role in high latitudes in SAONC, but it was characterized by a certain inhibitory effect at middle and low latitudes in SAONC. The uncertainty of NPP under the four models ranged from 16.29 to 26.52%. Our findings suggest that the impact of GW_1.5 °C is relatively high compared with the current conditions, whereas GW_2.0 °C implies significantly lower projected NPP growth in all areas.

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Section: Quantifiable Sources Of Uncertaintymentioning

confidence: 99%

Projection of Net Primary Productivity under Global Warming Scenarios of 1.5 °C and 2.0 °C in Northern China Sandy Areas

Huo

Zhao

et al. 2020

Atmosphere

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“…However, the intermittency of aeolian saltation over gobi is also influenced by sand availability. Results in this study revealed that AP was smaller than 1 throughout the entire measurement period, partly because the sand supply in the gobi area is limited; comparatively, continuous saltation on sand surfaces is common (e.g., Yang et al, 2013), in which the relatively less limited sand supply usually plays an important role. Our study revealed that the saltation threshold U t was mainly affected by the transport intensity AP.…”

Section: Intermittency and Saltation Thresholdmentioning

confidence: 68%

Intermittent Aeolian Saltation Over a Gobi Surface: Threshold, Saltation Layer Height, and High‐Frequency Variability

Tan

Zhang

et al. 2020

JGR Earth Surface

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Gobi is a type of desert pavement in Asia over which aeolian saltation generates atmospheric dust. However, the high-frequency behavior of aeolian saltation over gobi is still poorly understood. In this study, coupled high-frequency observations of three-dimensional (3-D) wind speed (U) and saltation particle count rate in a vertical array of Sensit sensors were performed in a gobi region of Milan County, southern Xinjiang, China. The results revealed that aeolian saltation over a gobi surface exhibited an intermittent phenomenon, and the level of the intermittency was governed by the relative wind strength (s), which is consistent with that of sand surfaces. The threshold wind speed (U t ) decreased exponentially with increasing transport activity parameter (AP), and a prominent decrease in U t was examined when the AP values reached 0.7; comparatively, for sand surfaces, a linearly declining trend occurred over the whole AP range of 0-1. The saltating particles over the gobi surface were distributed in layers of 0.08-0.30 m with an average value of 0.20 ± 0.04 m, which was significantly larger than that of sand surfaces. The relationship between the instantaneous sand transport rate (Q) and U over the gobi surface was also relatively poor and could be improved by lagging Q by 2 s. The mechanism for the collision between saltating particles and the gobi bed, which is rigid and complex in texture, was significantly different from that of the soft and deforming sand bed, causing the difference in aeolian saltation between gobi and sand surfaces.

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“…Hourly mean is calculated from in situ observation with a temporal resolution of 5 min. [70]. The stable boundary layer at nighttime was approximately 400-800 m thick, and the residual mixing layer above it could reach a thickness of over 3000 m, with a supernormal thickness existing over the Taklimakan Desert during the summer when it rained [71].…”

Section: Dust Optical Properties From Modis and Ground-based Sun Phot...mentioning

confidence: 96%

Vertical Structure of Dust Aerosols Observed by a Ground-Based Raman Lidar with Polarization Capabilities in the Center of the Taklimakan Desert

Zhang

Huang

et al. 2022

Remote Sensing

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The vertical structure of dust properties in desert sources is crucial for evaluating their long-range transportation and radiative forcing. To investigate vertical profiles of dust optical properties in the Taklimakan Desert, we conducted ground-based polarization Raman lidar measurements in Tazhong (83.39°E, 38.58°N, 1103 m above sea level), located at the center of the Taklimakan Desert in the summer of 2019. The lidar system developed by Lanzhou University for continuous network observation is capable of measuring polarization at 532 and 355 nm and detecting Raman signals at 387, 407, and 607 nm. The results indicate that dust aerosols in the central Taklimakan Desert were regularly lifted over 6 km during the summer with a mass concentration of 400–1000 µg m−3, while the majority of the dust remained restricted within 2 km. Moreover, the height of the boundary layer can reach 5–6 km in the afternoon under the strong convention. Above 3 km, dust is composed of finer particles with an effective radius (Reff.) less than 3 μm and a Ångström exponent (AE) related to the extinction coefficient (AEE)532,355 greater than 4; below 3 km, however, dust is dominated by coarser particles. In addition, the particle depolarization ratios (PDR) of Taklimakan dust are 0.32 ± 0.06 at 532 nm and 0.27 ± 0.04 at 355 nm, while the lidar ratios (LRs) are 49 ± 19 sr at 532 nm and 43 ± 12 sr at 355 nm. This study firstly provides information on dust vertical structure and its optical properties in the center of the desert, which may aid in further evaluating their associated impacts on the climate and ecosystem.

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Diurnal variations of saltation activity at Tazhong: the hinterland of Taklimakan Desert

Cited by 20 publications

References 30 publications

Projection of Net Primary Productivity under Global Warming Scenarios of 1.5 °C and 2.0 °C in Northern China Sandy Areas

Projection of Net Primary Productivity under Global Warming Scenarios of 1.5 °C and 2.0 °C in Northern China Sandy Areas

Intermittent Aeolian Saltation Over a Gobi Surface: Threshold, Saltation Layer Height, and High‐Frequency Variability

Vertical Structure of Dust Aerosols Observed by a Ground-Based Raman Lidar with Polarization Capabilities in the Center of the Taklimakan Desert

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