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Article ; Online: A modern pollen dataset from lake surface sediments on the central and western Tibetan Plateau

Q. Ma / L. Zhu / J. Ju / J. Wang / Y. Wang / L. Huang / T. Haberzettl

Earth System Science Data, Vol 16, Pp 311-

2024 Volume 320

Abstract: Modern pollen datasets are essential for pollen-based quantitative paleoclimate (e.g. precipitation) reconstructions, which can aid in better understanding recent climate change and its underlying forcing mechanisms. A modern pollen dataset based on ... ...

Abstract	Modern pollen datasets are essential for pollen-based quantitative paleoclimate (e.g. precipitation) reconstructions, which can aid in better understanding recent climate change and its underlying forcing mechanisms. A modern pollen dataset based on surface sediments from 90 lakes in the shrub, meadow, steppe and desert regions of the central and western Tibetan Plateau (TP) was established to fill geographical gaps left by previous datasets. Ordination analyses of pollen data and climatic parameters revealed that annual precipitation is the dominant factor in modern pollen distribution on the central and western TP. A regional transfer function for annual precipitation was developed with weighted averaging partial least squares (WA-PLS), which suggests a good inference power of the modern pollen dataset for annual precipitation. A case study in which the transfer function was effectively applied to a fossil pollen record from Tangra Yumco on the central TP for paleoprecipitation reconstruction demonstrated the significance of the modern pollen dataset in a lower data region for paleoclimate change studies. Data from this study, including pollen data for each sample and information on the sampled sites (location, altitude and climate data), are openly available via the Zenodo portal ( https://doi.org/10.5281/zenodo.8008474 , Ma et al., 2023).
Keywords	Environmental sciences ; GE1-350 ; Geology ; QE1-996.5
Subject code	333
Language	English
Publishing date	2024-01-01T00:00:00Z
Publisher	Copernicus Publications
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Responses of estuarine circulation to the morphological evolution in a convergent, microtidal estuary

R. Zhang / B. Hong / L. Zhu / W. Gong / H. Zhang

Ocean Science, Vol 18, Pp 213-

2022 Volume 231

Abstract: The Huangmaohai estuary (HE) is a funnel-shaped microtidal estuary in the west of the Pearl River Delta (PRD) in southern China. Since China reformed and opened up in 1978, extensive human activities have occurred and greatly changed the estuary's ... ...

Abstract	The Huangmaohai estuary (HE) is a funnel-shaped microtidal estuary in the west of the Pearl River Delta (PRD) in southern China. Since China reformed and opened up in 1978, extensive human activities have occurred and greatly changed the estuary's topography and modified its hydrodynamics. In this study, we examined the morphological evolution by analyzing remote sensing data with ArcGIS tools and studied the responses of hydrodynamics to the changes in topography from 1977 to 2010 by using the Delft3D model. We took the changes in estuarine circulation during neap tides in dry seasons as an example. The results show that human reclamation caused a narrowing of the estuary, and channel dredging deepened the estuary. These human activities changed both the longitudinal and lateral estuarine circulations. The longitudinal circulation was observed to increase with the deepening and narrowing of the estuary. The lateral circulation experienced changes in both the magnitude and pattern. The momentum balance analysis shows that when the depth and width changed simultaneously, the longitudinal estuarine circulation was modulated by both the channel deepening and width reduction, in which the friction, pressure gradient force, and advection terms were altered. The analysis of the longitudinal vortex dynamics indicates that the changes in the vertical shear of the longitudinal flow, lateral salinity gradient, and vertical mixing were responsible for the change in the lateral circulation. The changes in water depth are the dominant factors affecting lateral circulation intensity. This study has implications for sediment transport and morphological evolution in estuaries heavily impacted by human interventions.
Keywords	Geography. Anthropology. Recreation ; G ; Environmental sciences ; GE1-350
Subject code	551
Language	English
Publishing date	2022-02-01T00:00:00Z
Publisher	Copernicus Publications
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Chronic lymphocytic leukemia skin infiltrates presenting as eyebrow alopecia and erythematous pruritic papules refractory to treatment with topical steroids

Jane L. Zhu / Heather W. Goff

Clinical Case Reports, Vol 8, Iss 12, Pp 2521-

2020 Volume 2523

Abstract: Abstract We describe a patient who presented with erythematous papules and hair loss solely limited to the eyebrows. Clinicians should be aware of this presentation of leukemia cutis and consider this diagnosis in a patient with a history of CLL. ...

Abstract	Abstract We describe a patient who presented with erythematous papules and hair loss solely limited to the eyebrows. Clinicians should be aware of this presentation of leukemia cutis and consider this diagnosis in a patient with a history of CLL.
Keywords	alopecia ; chronic lymphocytic leukemia ; eyebrow ; leukemia cutis ; Medicine ; R ; Medicine (General) ; R5-920
Language	English
Publishing date	2020-12-01T00:00:00Z
Publisher	Wiley
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Inequalities for Hyperbolic Functions and Their Applications

L. Zhu

Journal of Inequalities and Applications, Vol

2010 Volume 2010

Abstract: A basic theorem is established and found to be a source of inequalities for hyperbolic functions, such as the ones of Cusa, Huygens, Wilker, Sandor-Bencze, Carlson, Shafer-Fink type inequality, and the one in the form of Oppenheim's problem. Furthermore, ...

Abstract	A basic theorem is established and found to be a source of inequalities for hyperbolic functions, such as the ones of Cusa, Huygens, Wilker, Sandor-Bencze, Carlson, Shafer-Fink type inequality, and the one in the form of Oppenheim's problem. Furthermore, these inequalities described above will be extended by this basic theorem.
Keywords	Mathematics ; QA1-939 ; Science ; Q ; DOAJ:Mathematics ; DOAJ:Mathematics and Statistics
Language	English
Publishing date	2010-01-01T00:00:00Z
Publisher	Springer
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Photosynthetic performance and growth responses of Liriope muscari (Decne.) L.H. Bailey (Asparagaceae) planted within poplar forests having different canopy densities

J. J. Zhang / L. Zhu / X. Zhang / J. Zhou

BMC Ecology, Vol 20, Iss 1, Pp 1-

2020 Volume 14

Abstract: Abstract Background Liriope muscari (Decne.) L.H. Bailey is a valuable horticultural and medicinal plant that grows under a range of light intensities, from high to low, in the understories of shrubs. To understand how this species adapts to these ... ...

Abstract	Abstract Background Liriope muscari (Decne.) L.H. Bailey is a valuable horticultural and medicinal plant that grows under a range of light intensities, from high to low, in the understories of shrubs. To understand how this species adapts to these various environments, we selected two groups of lilyturf growing under poplar trees at two different spacings. Each group was divided into three types, open field, forest edge and shaded forest with high, medium and low irradiance levels, respectively, and then we examined their photosynthetic characteristics, physiology and biomasses. Results Light saturation point, light compensation point and in situ net photosynthetic rate (P N) were highest in lilyturf growing under high light. In contrast, lilyturf growing under low light had a higher apparent quantum yield and Chl a and b contents, indicating that they adapted to low light. Although the leaves of lilyturf growing under low light were small, their root tubers were heavier. Conclusions The research demonstrates the eco-physiological basis of lilyturf’s shade adaptation mechanism as indicated by photosynthetic activity, chlorophyll fluorescence, Chl a, Chl b and Car contents when grown under different irradiances. We believe that lilyturf is a shade-tolerant plant suitable for planting in undergrowth, but attention should be paid to the canopy density of the forest when interplanting. The findings presented here advance our understanding of the photosynthetic characteristics of understory plants and may assist in the optimization of irradiances in the future.
Keywords	Undergrowth ; Light acclimation ; Light response curve ; Chlorophyll fluorescence ; Biomass ; Correlation analysis ; Ecology ; QH540-549.5
Subject code	580
Language	English
Publishing date	2020-04-01T00:00:00Z
Publisher	BMC
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Land subsidence modelling using a long short-term memory algorithm based on time-series datasets

H. Li / L. Zhu / H. Gong / H. Sun / J. Yu

Proceedings of the International Association of Hydrological Sciences, Vol 382, Pp 505-

2020 Volume 510

Abstract: With the rapid growth of data volume and the development of artificial intelligence technology, deep-learning methods are a new way to model land subsidence. We utilized a long short-term memory (LSTM) model, a deep-learning-based time-series processing ... ...

Abstract	With the rapid growth of data volume and the development of artificial intelligence technology, deep-learning methods are a new way to model land subsidence. We utilized a long short-term memory (LSTM) model, a deep-learning-based time-series processing method to model the land subsidence under multiple influencing factors. Land subsidence has non-linear and time dependency characteristics, which the LSTM model takes into account. This paper modelled the time variation in land subsidence for 38 months from 2011 to 2015. The input variables included the change in land subsidence detected by InSAR technology, the change in confined groundwater level, the thickness of the compressible layer and the permeability coefficient. The results show that the LSTM model performed well in areas where the subsidence is slight but poorly in places with severe subsidence.
Keywords	Environmental sciences ; GE1-350 ; Geology ; QE1-996.5
Subject code	550
Language	English
Publishing date	2020-04-01T00:00:00Z
Publisher	Copernicus Publications
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Numerical analysis of agricultural emissions impacts on PM 2.5 in China using a high-resolution ammonia emission inventory

X. Han / L. Zhu / M. Liu / Y. Song / M. Zhang

Atmospheric Chemistry and Physics, Vol 20, Pp 9979-

2020 Volume 9996

Abstract: China is one of the largest agricultural countries in the world. Thus, NH 3 emission from agricultural activities in China considerably affects the country's regional air quality and visibility. In this study, a high-resolution agricultural NH 3 emission ...

Abstract	China is one of the largest agricultural countries in the world. Thus, NH 3 emission from agricultural activities in China considerably affects the country's regional air quality and visibility. In this study, a high-resolution agricultural NH 3 emission inventory compiled on 1 km × 1 km horizontal resolution was applied to calculate the NH 3 mass burden in China and reliably estimate the influence of NH 3 on agriculture. The key parameter emission factors of this inventory were enhanced by considering many experiment results, and the dynamic data of spatial and temporal information were updated using statistical data of 2015. In addition to fertilizers and husbandry, farmland ecosystems, livestock waste, crop residue burning, wood-based fuel combustion, and other NH 3 emission sources were included in this inventory. Furthermore, a source apportionment tool, namely, the Integrated Source Apportionment Method (ISAM) coupled with the air quality modeling system Regional Atmospheric Modeling System and Community Multiscale Air Quality, was applied to capture the contribution of NH 3 emitted from total agriculture ( T agr ) in China. The aerosol mass concentration in 2015 was simulated, and results showed that the high mass concentration of NH 3 exceeded 10 µ g m −3 and mainly appeared in the North China Plain, Central China, the Yangtze River Delta, and the Sichuan Basin. Moreover, the annual average contribution of T agr NH 3 to PM 2.5 mass burden was 14 %–22 % in China. Specific to the PM 2.5 components, T agr NH 3 contributed dominantly to ammonium formation (87.6 %) but trivially to sulfate formation (2.2 %). In addition, several brute-force sensitivity tests were conducted to estimate the impact of T agr NH 3 emission reduction on PM 2.5 mass burden. In contrast to the result of ISAM, even though the T agr NH 3 only provided 10.1 % contribution to nitrate under the current emission scenario, the reduction of nitrate could reach 95.8 % upon removal of the T agr NH 3 emission. This deviation occurred because ...
Keywords	Physics ; QC1-999 ; Chemistry ; QD1-999
Subject code	511
Language	English
Publishing date	2020-08-01T00:00:00Z
Publisher	Copernicus Publications
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Estimation of tropical cyclone wind hazards in coastal regions of China

G. Fang / L. Zhao / S. Cao / L. Zhu / Y. Ge

Natural Hazards and Earth System Sciences, Vol 20, Pp 1617-

2020 Volume 1637

Abstract: Coastal regions of China feature high population densities as well as wind-sensitive structures and are therefore vulnerable to tropical cyclones (TCs) with approximately six to eight landfalls annually. This study predicts TC wind hazard curves in terms ...

Abstract	Coastal regions of China feature high population densities as well as wind-sensitive structures and are therefore vulnerable to tropical cyclones (TCs) with approximately six to eight landfalls annually. This study predicts TC wind hazard curves in terms of design wind speed versus return periods for major coastal cities of China to facilitate TC-wind-resistant design and disaster mitigation as well as insurance-related risk assessment. The 10 min wind information provided by the Japan Meteorological Agency (JMA) from 1977 to 2015 is employed to rebuild TC wind field parameters (radius of maximum winds R max,s and shape parameter of radial pressure profile B s ) at surface level using a height-resolving boundary layer model. These parameters will be documented to develop an improved JMA dataset. The probabilistic behaviors of historical tracks and wind field parameters at the first time step within a 500 km radius subregion centered at a site of interest are examined to determine preferable probability distribution models before stochastically generating correlated genesis parameters utilizing the Cholesky decomposition method. Recursive models are applied for translation speed, R max,s and B s during the TC track and wind field simulations. Site-specific TC wind hazards are studied using 10 000-year Monte Carlo simulations and compared with code suggestions as well as other studies. The resulting estimated wind speeds for northern cities (Ningbo and Wenzhou) under a TC climate are higher than code recommendations, while those for southern cities (Zhanjiang and Haikou) are lower. Other cities show a satisfactory agreement with code provisions at the height of 10 m. Some potential reasons for these findings are discussed to emphasize the importance of independently developing hazard curves of TC winds.
Keywords	Environmental technology. Sanitary engineering ; TD1-1066 ; Geography. Anthropology. Recreation ; G ; Environmental sciences ; GE1-350 ; Geology ; QE1-996.5
Subject code	551
Language	English
Publishing date	2020-06-01T00:00:00Z
Publisher	Copernicus Publications
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Influences of an entrainment–mixing parameterization on numerical simulations of cumulus and stratocumulus clouds

X. Xu / C. Lu / Y. Liu / S. Luo / X. Zhou / S. Endo / L. Zhu / Y. Wang

Atmospheric Chemistry and Physics, Vol 22, Pp 5459-

2022 Volume 5475

Abstract: Different entrainment–mixing processes can occur in clouds; however, a homogeneous mixing mechanism is often implicitly assumed in most commonly used microphysics schemes. Here, we first present a new entrainment–mixing parameterization that uses the ... ...

Abstract	Different entrainment–mixing processes can occur in clouds; however, a homogeneous mixing mechanism is often implicitly assumed in most commonly used microphysics schemes. Here, we first present a new entrainment–mixing parameterization that uses the grid mean relative humidity without requiring the relative humidity of the entrained air. Then, the parameterization is implemented in a microphysics scheme in a large eddy simulation model, and sensitivity experiments are conducted to compare the new parameterization with the default homogeneous entrainment–mixing parameterization. The results indicate that the new entrainment–mixing parameterization has a larger impact on the number concentration, volume mean radius, and cloud optical depth in the stratocumulus case than in the cumulus case. This is because inhomogeneous and homogeneous mixing mechanisms dominate in the stratocumulus and cumulus cases, respectively, which is mainly due to the larger turbulence dissipation rate in the cumulus case. Because stratocumulus clouds break up during the dissipation stage to form cumulus clouds, the effects of this new entrainment–mixing parameterization during the stratocumulus dissipation stage are between those during the stratocumulus mature stage and the cumulus case. A large aerosol concentration can enhance the effects of this new entrainment–mixing parameterization by decreasing the cloud droplet size and evaporation timescale. The results of this new entrainment–mixing parameterization with grid mean relative humidity are validated by the use of a different entrainment–mixing parameterization that uses parameterized entrained air properties. This study sheds new light on the improvement of entrainment–mixing parameterizations in models.
Keywords	Physics ; QC1-999 ; Chemistry ; QD1-999
Subject code	551
Language	English
Publishing date	2022-04-01T00:00:00Z
Publisher	Copernicus Publications
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Optical and chemical properties and oxidative potential of aqueous-phase products from OH and 3 C ∗ -initiated photooxidation of eugenol

X. Li / Y. Tao / L. Zhu / S. Ma / S. Luo / Z. Zhao / N. Sun / X. Ge / Z. Ye

Atmospheric Chemistry and Physics, Vol 22, Pp 7793-

2022 Volume 7814

Abstract: Aqueous reactions may turn precursors into light-absorbing and toxic products, leading to air quality deterioration and adverse health effects. In this study, we comprehensively investigated eugenol photooxidation (a representative biomass-burning- ... ...

Abstract	Aqueous reactions may turn precursors into light-absorbing and toxic products, leading to air quality deterioration and adverse health effects. In this study, we comprehensively investigated eugenol photooxidation (a representative biomass-burning-emitted, highly substituted phenolic compound) in the bulk aqueous phase with direct photolysis, a hydroxyl radical (OH), and an organic triplet excited state ( 3 C ∗ ). Results show that the degradation rates of eugenol followed the order of 3 C <math xmlns="http://www.w3.org/1998/Math/MathML" id="M6" display="inline" overflow="scroll" dspmath="mathml"><mrow><msup><mi/><mo>∗</mo></msup><mo>></mo></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="16pt" height="11pt" class="svg-formula" dspmath="mathimg" md5hash="815d137e7297c0cca1ef78cd8c40eec9"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="acp-22-7793-2022-ie00001.svg" width="16pt" height="11pt" src="acp-22-7793-2022-ie00001.png"/></svg:svg> OH > direct photolysis. During the 3 C ∗ -initiated oxidation, different reactive oxygen species (ROS), including 3 C ∗ , OH, 1 O 2 , and O <math xmlns="http://www.w3.org/1998/Math/MathML" id="M14" display="inline" overflow="scroll" dspmath="mathml"><mrow><msubsup><mi/><mn mathvariant="normal">2</mn><mrow><mi class="Radical" mathvariant="normal">⚫</mi><mo>-</mo></mrow></msubsup></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="12pt" height="16pt" class="svg-formula" dspmath="mathimg" md5hash="38e88279edae3c2306125c2b688c882b"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="acp-22-7793-2022-ie00002.svg" width="12pt" height="16pt" src="acp-22-7793-2022-ie00002.png"/></svg:svg> , can participate in the oxidation of eugenol, quenching experiments verified 3 C ∗ was the most important one, while, during OH-initiated ...
Keywords	Physics ; QC1-999 ; Chemistry ; QD1-999
Language	English
Publishing date	2022-06-01T00:00:00Z
Publisher	Copernicus Publications
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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